CN103277176B - Silicon controlled rectifier (SCR) metering injection system - Google Patents
Silicon controlled rectifier (SCR) metering injection system Download PDFInfo
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- CN103277176B CN103277176B CN201310241946.2A CN201310241946A CN103277176B CN 103277176 B CN103277176 B CN 103277176B CN 201310241946 A CN201310241946 A CN 201310241946A CN 103277176 B CN103277176 B CN 103277176B
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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 invention discloses a silicon controlled rectifier (SCR) metering injection system which comprises a liquid storage tank, a reversing valve, a metering injection pump, a filtering voltage stabilizer, an injection module and a control unit which are connected through a pipeline. The control unit is used for controlling a metering injection process. The metering injection pump comprises an outer casing. The pipeline comprises an injection pipeline and a liquid return pipeline. The reversing valve comprises a lower valve body and an upper valve body. The lower valve body is integrally installed on the casing of the metering injection pump. The upper valve body is driven by an electromagnet to rotate to achieve reversing of a flow channel. In the injection state, a reducing agent is pumped to the injection module from the liquid storage tank along the injection pipeline to be subjected to metering injection. When return liquid is completely discharged, the electromagnet pushes the upper valve body to steer to enable the reducing agent in the injection pipeline to be pumped to the liquid storage tank along the liquid return pipeline. Switching of a liquid inlet flow channel and a liquid return flow channel is achieved through the reversing valve, so that the pipelines in the SCR metering injection system and the structure are simplified.
Description
Technical field
The present invention relates to the SCR metering injection system in motor-vehicle tail-gas reprocessing, especially relate to a kind of urea metering injection system without gas.
Background technique
Along with more and more higher to environmental protection requirement of society, the dynamics of Environmental protection is increasing, puts into effect relevant policies, especially the implementation of " state IV standards " with regard to vehicular emission aspect national correlation department, controls stricter to vehicular emission.Existing known, selective catalytic reduction technology (SCR) is the main flow route of motor-vehicle tail-gas post-processing technology, by reducing agent (i.e. aqueous solution of urea, be called in industry " adding indigo plant ") by nozzle quantitative injection intake and exhaust pipeline, and by SCR catalyst by the main harmful gas NO in waste gas
xchange into nitrogen and water discharge, reach the object of tail gas clean-up.
But, existing SCR ejecting system is divided into has gas system and without gas system two kinds, there is the transmitting power that reducing agent is provided by power source (as diaphragm pump or electromagnetic pump) of gas system, under the control of control unit and metering valve, reducing agent in liquid tank is carried out mixing through mixing chamber, be atomized after be injected in outlet pipe, to carry out catalytic reduction process to tail gas in outlet pipe, and this Control system architecture is comparatively complicated, cost is higher, and needs to provide vehicle-mounted source of the gas.
Usually, aqueous solution of urea is first transported to nozzle entrance by pump by airless injection system, reaches elevated pressures, then controls aqueous solution of urea by the time length of Control Nozzle open and close and is ejected into amount in outlet pipe.
Without gas system with have compared with gas system, do not need source of the gas and mixing chamber, it also avoid air and reducing agent reflects the technical problem forming crystallization, but it is emptying to need the reducing agent remained in injection line to carry out back liquid, in prior art, the general liquid return pipe road by separately establishing or the control valve control reducing agent of adopting is back in liquid tank, and the pipeline being arranged so that SCR system on this liquid return pipe road connects comparatively complicated.
Summary of the invention
The object of the invention is to improve existing SCR metering injection system, a kind of SCR metering injection system of optimization is provided, it realizes the feed liquor runner of reducing agent by valve body and returns the switching of liquid runner, after injection completes, by returning liquid runner, to carry out Liquid Residue back suction emptying, with the pipeline in simplification system and structure to make metering ejector pump.
For achieving the above object, the present invention proposes following technological scheme: a kind of SCR metering injection system, comprise the liquid tank, the pump power unit that are connected by pipeline, selector valve, filtration voltage stabilizer, jet module, and control the control unit of metered injection process, described liquid tank is used for storage and reduction agent, and described metering ejector pump has frame, and described pipeline comprises injection line and liquid return pipe road; Described selector valve comprises lower valve body and upper valve body, and described lower valve body is installed on the frame of described metering ejector pump, described upper valve body is equipped with pump power module, and can drive rotation by an electromagnet and realize pump one-way valve, and liquid in-out runner must commutate; When spray regime, reducing agent is pumped to described jet module and carries out metered injection along injection line from liquid tank, when returning liquid and being emptying, described electromagnet promotes described upper valve body and turns to, and the reducing agent in injection line is oppositely pumped in described liquid tank along liquid return pipe road.
First, described upper valve body is provided with liquid sucting port and liquid port, and the plural liquid stream interface be connected with liquid port with described liquid sucting port, and leads to the stationary flowpath interface of pump one-way valve.
Described lower valve body is then provided with liquid entering hole, liquid outlet and the stifled liquid level corresponding with the plural liquid stream interface on described upper valve body.
Described lower valve body is arranged on the frame of described metering ejector pump, it has the fixer head piece corresponding with upper valve body liquid sucting port and liquid port.
Described upper valve body promotes a connecting rod by described electromagnet, and drives realization to rotate by connecting rod.
Described upper valve body liquid flow tube road integrated package comprises the first liquid stream interface, the second liquid stream interface, the 3rd liquid stream interface and the 4th liquid stream interface.
Have triple containment measures between described upper and lower valve body, i.e. runner interface, runner interface periphery and up and down valve body socket side respectively have a road sealing device, can effectively prevent ejection medium from leaking.
During described metering ejector pump forward imbibition, the first liquid stream interface on described upper valve body and the second liquid stream interface are in the position be connected with the liquid entering hole on described lower valve body and liquid outlet respectively, reducing agent is pumped to the liquid entering hole of lower valve body from liquid tank, through the first liquid stream interface of upper valve body, liquid sucting port, liquid port and the second liquid stream interface, be expelled in described filtration voltage stabilizer from the liquid outlet of lower valve body.
When described metered injection blowback liquid is emptying, the 3rd liquid stream interface on described upper valve body and the 4th liquid stream interface are in the position be connected with the liquid outlet on described lower valve body and liquid entering hole respectively, described reducing agent sucks from the liquid outlet of described lower valve body, through the 3rd liquid stream interface of upper valve body, liquid sucting port, after liquid port and the 4th liquid stream interface, be expelled in described liquid tank from the liquid entering hole of lower valve body.
The upstream of described jet module is also provided with the one-way gas-compensating valve be connected with ambient air, for back suction tonifying Qi and avoid jetburner from during outlet pipe tonifying Qi aspirated foreign body blocking jet module.
Described SCR metering injection system also comprises an overflow passage, described overflow passage is provided with relief valve, continue suction for pump under metered injection running state or internal-combustion engine shutoff situation temporarily and realize medium circulation, actual ejection state pressure is fluctuated few, and to after parking by medium circulation anti-freeze.
Compared with prior art, the invention has the beneficial effects as follows:
1) achieve the feed liquor runner of reducing agent and the switching of backflow fluid passage by selector valve, simplify pipeline and the structure of system;
2) valve body and metering ejector pump unitary design under selector valve, compact structure, takes up room little;
3) reducing agent in pipeline is oppositely aspirated, prevent reducing agent from causing the blocking of pipeline because of reasons such as crystallizations.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of SCR metering injection system of the present invention;
Fig. 2 is the structural representation of upper valve body of the present invention;
Fig. 3 is the schematic perspective view of another angle of Fig. 2;
Fig. 4 is the structural representation that upper valve body of the present invention realizes turning to;
Fig. 5 is the structural representation of valve body under the present invention;
Fig. 6 be SCR metering injection system of the present invention when metered injection state, reducing agent flows to schematic diagram between upper valve body and lower valve body;
Fig. 7 is SCR metering injection system of the present invention when returning liquid emptying state, and reducing agent flows to schematic diagram between upper valve body and lower valve body.
Reference character: 1, liquid tank, 2, selector valve, 21, upper valve body, 211, liquid sucting port, 212, liquid port, 213, liquid flow tube road integrated package, 2131, first liquid stream interface, 2132, second liquid stream interface, 2133, 3rd liquid stream interface, 2134, 4th liquid stream interface, 22, lower valve body, 221, liquid entering hole, 222, liquid outlet, 223, stifled liquid mouth, 3, metering ejector pump, 31, housing, 4, filter voltage stabilizer, 5, jet module, 6, control unit, 7, filter cleaner, 8, steering bearing, 9, electromagnet, 10, connecting rod, 11, relief valve, 12, aeration valve.
Embodiment
Below in conjunction with accompanying drawing of the present invention, clear, complete description is carried out to the technological scheme of the embodiment of the present invention.
As shown in Figure 1, disclosed SCR metering injection system, it comprises and connects liquid tank 1 by pipeline, selector valve 2, metering ejector pump 3, filters voltage stabilizer 4, jet module 5, and controls the control unit (PCU) 6 of metered injection process.Described liquid tank 1 is for reducing agent (i.e. aqueous solution of urea), described selector valve 2 is for switching injection line and liquid return pipe road, comprise upper valve body 21 and lower valve body 22, described metering ejector pump 3 is under the control of control unit 6, reducing agent in liquid tank 1 is carried out being pumped to jet module 5, and is sprayed by jet module 5.Preferably, the pipeline between liquid tank 1 and selector valve 2 is also provided with the filter cleaner 7 filtered reducing agent, described selector valve 2 is two-position four-way solenoid valves.
Shown in composition graphs 2, described selector valve 2 is made up of upper valve body 21 and the lower valve body 22 that connects with upper valve body 21, described upper valve body 21 connects with a steering bearing 8, upper valve body 21 is provided with liquid sucting port 211 and liquid port 212, and the liquid flow tube road integrated package 213 to be connected with liquid port 212 with described liquid sucting port 211, in the present embodiment, described liquid flow tube road integrated package 213 comprises the first liquid stream interface 2131, second liquid stream interface the 2132, three liquid stream interface 2133 and the 4th liquid stream interface 2134.
Described upper valve body 21 can realize turning under the effect of an electromagnet 9, as shown in Figure 3, after electromagnet 9 is energized, promote a connecting rod 10 be connected with upper valve body 21, upper valve body 21 is under the promotion of connecting rod 10, after turning over an angle preset (in the present embodiment being 36 degree), achieve the forward imbibition state of metering ejector pump 3 from liquid tank 1 imbibition to the conversion of oppositely returning liquid aspiration phases from the imbibition of filtration voltage stabilizer 4.
As shown in Figure 4, described lower valve body 22 is arranged on the housing 31 of metering ejector pump 3 integratedly, lower valve body 22 is provided with liquid entering hole 221, liquid outlet 222 and several stifled liquid mouth 223, described liquid entering hole 221 is connected with liquid tank 1, liquid outlet 222 is connected with filtration voltage stabilizer 4, and meanwhile, the liquid flow tube road integrated package 213 that liquid entering hole 221 and liquid outlet 222 are corresponding with on upper valve body 21 is respectively connected.And due to imbibition state with return liquid status and compare, because upper valve body 21 has turned over certain angle relative to lower valve body 22, therefore, the position, hole under two states on the corresponding liquid flow tube road integrated package 213 be communicated with is different.
Specifically, as shown in Figure 5, when metering ejector pump 3 forward imbibition, the first liquid stream interface 2131 on described upper valve body 21 and the second liquid stream interface 2132 are in the position be connected with the liquid entering hole 221 on lower valve body 22 and liquid outlet 222 respectively, and the 3rd liquid stream interface 2133 on upper valve body 21 and the 4th liquid stream interface 2134 block by the stifled liquid mouth 223 of corresponding position on lower valve body 22.Metering ejector pump 3 is under the control of control unit 6, reducing agent is pumped to from liquid tank 1 after selector valve 2 and filters voltage stabilizer 4, at filtration voltage stabilizer 4 inner filtration after voltage stabilizing, spraying through jet module 5, superpressure part through relief valve 11 releasing pressure automatically in liquid tank 1.
Wherein, during imbibition state the liquid of reducing agent between selector valve 2 upper valve body 21 and lower valve body 22 flow away to for: first reducing agent is pumped to corresponding position first liquid stream interface 2131 on upper valve body 21 from the liquid entering hole 221 of lower valve body 22, and flow to the liquid sucting port 211 of upper valve body 21 by this first liquid stream interface 2131; Reducing agent enters upper valve body 21 liquid port 212 from upper valve body 21 liquid sucting port 211 again, and after the second liquid stream interface 2132 be connected with upper valve body 21 liquid port 212, eventually passes through lower valve body 22 upper liquid outlet 222 and export in filtration voltage stabilizer 4.
After injection completes, the reducing agent do not sprayed completely is also remained in injection line, injection line is resulted in blockage because of reasons such as crystallizations for preventing the reducing agent that remains, after this ejecting system completes metered injection, also to carry out in aspiration, remaining the process of reducing agent to the reverse suction evacuation of liquid tank 1, and in the present embodiment, the injection line when liquid return pipe road of oppositely suction and forward imbibition are sprayed overlaps, just carry out the commutation of runner by selector valve 2.Concrete commutation process is: after electromagnet 9 is energized, upper valve body 21 is driven to rotate the angle preset by linkage mechanism 10, after turning to, the first liquid stream interface 2131, second liquid stream interface 2132 on upper valve body 21 turns to the position corresponding with the stifled liquid mouth 223 on lower valve body 22 respectively, thus block by the stifled liquid mouth 223 on lower valve body 22, meanwhile, the 3rd liquid stream interface 2133 of upper valve body 21 and the 4th liquid stream interface 2134 rotate to the position communicated with the liquid entering hole 221 on lower valve body 22 and liquid outlet 222 and connect.
As shown in Figure 6, for return liquid time reducing agent flow away to schematic diagram at the liquid between the upper valve body 21 and lower valve body 22 of selector valve 2, reducing agent sucks the 4th liquid stream interface 2134 of corresponding position on upper valve body 21 from the liquid outlet 222 of lower valve body 22, and then after flowing through the liquid sucting port 211 of upper valve body 21, liquid port 212, the 3rd liquid stream interface 2133 on upper valve body 21 flows to the liquid entering hole 221 of lower valve body 22 corresponding position, and flow back in liquid tank 1 from this liquid entering hole 221, thus complete the reflux course of reducing agent in injection line.
More preferably, also overflow passage is comprised in SCR metering injection system in the present embodiment, as shown in Figure 1, described overflow passage is provided with relief valve 11, its one end connects with described filtration voltage stabilizer 4, the other end connects with liquid tank 1, under the control of control unit 6, when the pressure in the injection line recorded by pressure transducer P reaches predefined value, then open relief valve 11, the reducing agent in pipeline is delivered in liquid tank 1, until when the pressure in injection line drops in the scope of normal injection pressure, relief valve 11 cuts out, and only sprays normally.
More preferably, the SCR metering injection system that the present embodiment discloses also comprises one and arranges jet module 5 upstream aeration valve 12, one input end of this aeration valve 12 and extraneous contact air, for when metered injection blowback liquid, air required when supplementing back liquid from air.
Technology contents of the present invention and technical characteristics have disclosed as above; but those of ordinary skill in the art still may do all replacement and the modification that do not deviate from spirit of the present invention based on teaching of the present invention and announcement; therefore; scope should be not limited to the content that embodiment discloses; and various do not deviate from replacement of the present invention and modification should be comprised, and contained by present patent application claim.
Claims (10)
1. a SCR metering injection system, comprise the liquid tank, selector valve, metering ejector pump, filtration voltage stabilizer, the jet module that are connected by pipeline, and control the control unit of metered injection process, described liquid tank is used for storage and reduction agent, described metering ejector pump has frame, and described pipeline comprises injection line and liquid return pipe road; It is characterized in that: described selector valve comprises lower valve body and upper valve body, described lower valve body is installed on the frame of described metering ejector pump, and described upper valve body can drive rotation by an electromagnet and realize runner commutation; When spray regime, reducing agent is pumped to described jet module and carries out metered injection along injection line from liquid tank, when returning liquid and being emptying, described electromagnet promotes described upper valve body and turns to, and the reducing agent in injection line is pumped in described liquid tank along liquid return pipe road.
2. SCR metering injection system according to claim 1, is characterized in that: described upper valve body is provided with liquid sucting port and liquid port, and the several liquid stream interfaces be connected with liquid port with described liquid sucting port.
3. SCR metering injection system according to claim 2, is characterized in that: described lower valve body is provided with optionally corresponding with the several liquid stream interfaces on described upper valve body liquid entering hole, liquid outlet and stifled liquid mouth.
4. SCR metering injection system according to claim 1, is characterized in that: described lower valve body is arranged on the frame of described metering ejector pump.
5. SCR metering injection system according to claim 1, is characterized in that: described upper valve body promotes a connecting rod by described electromagnet, and drives realization to rotate by connecting rod.
6. SCR metering injection system according to claim 2, is characterized in that: described liquid stream interface comprises the first liquid stream interface, the first liquid stream interface, the second liquid stream interface, the 3rd liquid stream interface and the 4th liquid stream interface.
7. SCR metering injection system according to claim 6, it is characterized in that: during described metering ejector pump forward imbibition, the first liquid stream interface on described upper valve body and the second liquid stream interface are in the position be connected with the liquid entering hole on described lower valve body and liquid outlet respectively, reducing agent is pumped to the liquid entering hole of lower valve body from liquid tank, through the first liquid stream interface of upper valve body, liquid sucting port, liquid port and the second liquid stream interface, be expelled in described filtration voltage stabilizer from the liquid outlet of lower valve body.
8. SCR metering injection system according to claim 6, it is characterized in that: when described metered injection blowback liquid is emptying, the 3rd liquid stream interface on described upper valve body and the 4th liquid stream interface are in the position be connected with the liquid outlet on described lower valve body and liquid entering hole respectively, described reducing agent sucks from the liquid outlet of described lower valve body, through the 3rd liquid stream interface of upper valve body, liquid sucting port, after liquid port and the 4th liquid stream interface, is expelled in described liquid tank from the liquid entering hole of lower valve body.
9. SCR metering injection system according to claim 1, is characterized in that: the upstream of described jet module is also provided with the aeration valve be connected with ambient air.
10. SCR metering injection system according to claim 1, it is characterized in that: also comprise an overflow passage, described overflow passage is provided with relief valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310241946.2A CN103277176B (en) | 2013-06-18 | 2013-06-18 | Silicon controlled rectifier (SCR) metering injection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310241946.2A CN103277176B (en) | 2013-06-18 | 2013-06-18 | Silicon controlled rectifier (SCR) metering injection system |
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| Publication Number | Publication Date |
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| CN103277176A CN103277176A (en) | 2013-09-04 |
| CN103277176B true CN103277176B (en) | 2015-04-01 |
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| CN201310241946.2A Expired - Fee Related CN103277176B (en) | 2013-06-18 | 2013-06-18 | Silicon controlled rectifier (SCR) metering injection system |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3061256B1 (en) * | 2016-12-26 | 2019-09-27 | Plastic Omnium Advanced Innovation And Research | PRESSURE COMPENSATOR IN A LIQUID BUBBLE EMPRISONED IN ICE. |
| CN106762048A (en) * | 2017-01-18 | 2017-05-31 | 重庆凯瑞伟柯斯环保科技有限公司 | Pumping unit and the urea liquid feed system and method for SCR system crystallization-preventive |
| CN112682130A (en) * | 2019-10-18 | 2021-04-20 | 中国船舶重工集团公司第七一一研究所 | Marine urea supply injection system and method |
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| CN101573515A (en) * | 2006-12-28 | 2009-11-04 | 罗伯特·博世有限公司 | Device for metering a liquid reducing agent |
| EP2206897A1 (en) * | 2009-01-09 | 2010-07-14 | Robert Bosch GmbH | Supply device for a SCR system |
| CN102022168A (en) * | 2009-09-14 | 2011-04-20 | 罗伯特.博世有限公司 | Method of monitoring function of selective catalytic reaction (SCR) catalyst |
| CN102477892A (en) * | 2010-11-30 | 2012-05-30 | 苏州派格力减排系统有限公司 | Automatic calibration system for urea metering jet pumps and calibration method thereof |
| CN103147827A (en) * | 2013-03-26 | 2013-06-12 | 无锡市凯龙汽车设备制造有限公司 | Selective catalytic conversion injection system of diesel engine |
| CN203321641U (en) * | 2013-06-18 | 2013-12-04 | 苏州派格丽减排系统有限公司 | SCR metering injection system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008000935A1 (en) * | 2008-04-02 | 2009-10-08 | Robert Bosch Gmbh | SCR system with several tanks |
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2013
- 2013-06-18 CN CN201310241946.2A patent/CN103277176B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101573515A (en) * | 2006-12-28 | 2009-11-04 | 罗伯特·博世有限公司 | Device for metering a liquid reducing agent |
| EP2206897A1 (en) * | 2009-01-09 | 2010-07-14 | Robert Bosch GmbH | Supply device for a SCR system |
| CN102022168A (en) * | 2009-09-14 | 2011-04-20 | 罗伯特.博世有限公司 | Method of monitoring function of selective catalytic reaction (SCR) catalyst |
| CN102477892A (en) * | 2010-11-30 | 2012-05-30 | 苏州派格力减排系统有限公司 | Automatic calibration system for urea metering jet pumps and calibration method thereof |
| CN103147827A (en) * | 2013-03-26 | 2013-06-12 | 无锡市凯龙汽车设备制造有限公司 | Selective catalytic conversion injection system of diesel engine |
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