CN103603713A - Pneumatic duplex measurement and injection system - Google Patents
Pneumatic duplex measurement and injection system Download PDFInfo
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- CN103603713A CN103603713A CN201310547507.4A CN201310547507A CN103603713A CN 103603713 A CN103603713 A CN 103603713A CN 201310547507 A CN201310547507 A CN 201310547507A CN 103603713 A CN103603713 A CN 103603713A
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- air
- cavity
- liquid
- urea
- pneumatic duplex
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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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- 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
- Y02T10/40—Engine management systems
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- Exhaust Gas After Treatment (AREA)
Abstract
The invention provides a pneumatic duplex measurement and injection system. The pneumatic duplex measurement and injection system comprises a urea tank, an air source for providing injection pressure, a pneumatic duplex pump, air solenoid valve, an air channel reversing valve, a liquid channel reversing valve, a pressure sensor, a control unit, air pipelines, urea pipelines and an electric control circuit, wherein the air pipelines, the urea pipelines and the electric control circuit play a role in connection, and the pneumatic duplex pump comprises liquid chambers, air chambers arranged in the liquid chambers and a sliding connecting rod arranged in the air chambers; the air source is connected with the air chambers of the pneumatic duplex pump through the air pipelines, and the air solenoid valve and the air channel reversing valve are connected on the air pipelines; the urea tank and a urea injection valve are respectively connected with the liquid chambers on two sides of the pneumatic duplex pump through the urea pipelines, and the liquid channel reversing valve is arranged on the urea pipelines. The pneumatic duplex measurement and injection system is simple in structure, few in parts and low in cost, and an original urea tank does not need to be changed; compressed air is used as a main power source, so that the system is low in air consumption, low in operation cost, energy saving and environmentally friendly; besides, the system has shutdown emptying capability to prevent the pipelines from being frozen, and is good is safety and stability.
Description
Technical field
The present invention relates to a kind of vehicle exhaust SCR processor, the pneumatic duplex metering injection system of especially a kind of SCR.
Background technique
Existing main flow SCR ejecting system is used electric power as main power source, and this mode consumes the electric power of vehicular power-bottle, increases operating cost.The prior art that the model utility that the patent No. of take is CN201020136109.5 is representative discloses a kind of jet control system utilizing air power to atomize urea reductant, its carbamide reducing agent relies on compressed-air actuated motivational drive, mixed aerosol in urea nozzle, rely on the regulation and control of flow solenoid valve, make carbamide reducing agent atomization in the nozzle in single chamber, reach the purified treatment to the NOX in vehicle exhaust.And use pressurized air need to transform urea box as the system of main power source, increased the cost of producing and manufacturing.
Summary of the invention
The problem to be solved in the present invention is to provide a kind of pneumatic duplex urea-spray system, and this system is used pressurized air as main power source, but does not need urea box to do any change.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of pneumatic duplex metering injection system, comprise urea box, the source of the gas of jet pressure, pneumatic duplex pump, air solenoid valve, gas circuit selector valve, liquid way reversing valve, pressure transducer, control unit are provided, and the gas piping, urea pipe and the automatically controlled circuit that play connection function.
Source of the gas is connected with the air cavity of pneumatic duplex pump by gas piping, connects the gentle way reversing valve of air solenoid valve on gas piping; Urea box is connected with pneumatic duplex pump by urea pipe respectively with carbamide injection valve, and liquid way reversing valve is set on urea pipe.
Urea pipe between liquid way reversing valve and carbamide injection valve is provided with pressure transducer.
Pneumatic duplex pump comprises sap cavity, is arranged on the air cavity in sap cavity and is arranged on the sliding linkage in air cavity.Sap cavity is comprised of left liquid cavity and right liquid cavity, and air cavity is comprised of left air cavity and right air cavity.
Left air cavity and right air cavity are respectively provided with a position limit switch.
Working procedure:
When air solenoid valve is opened, pressurized air enters gas circuit selector valve, and according to the difference of gas circuit selector valve position, pressurized air enters left air cavity or the right air cavity of pneumatic duplex pump;
When pressurized air enters left air cavity, left air cavity increases, and can compress the volume of the left liquid container of duplex pump simultaneously, realizes the pressure of building of left liquid cavity; Meanwhile, under the effect of connecting rod, right air cavity volume reduces, and right liquid cavity volume increases, and pressure reduces, and liquid is sucked to right liquid cavity;
When the volume of left liquid cavity reduces to after the limit, gas circuit selector valve switching position, pressurized air enters right air cavity, and now right liquid cavity starts to build pressure, left liquid cavity imbibition.
Than existing SCR metering injection system, advantage and good effect that the present invention has are:
1) system architecture is simple, and number of components is few, and without original urea box is changed, cost is low.
2) use pressurized air as main power source, and air consumption is few, operating cost is low, energy-conserving and environment-protective.
3) under compressed-air actuated driving, chamber, left and right alternate run, duplex pump continuous operation, can guarantee to spray needed pressure.
4) have the emptying ability of shutdown, avoid pipeline to freeze, security and stability is good.
Accompanying drawing explanation
Fig. 1 is system architecture schematic diagram of the present invention
Fig. 2 is duplex pump structural representation
Fig. 3 is working-flow figure
Fig. 4 is the liquid schematic flow sheet that adds of the present invention
Fig. 5 is pressure, the injection schematic flow sheet built of the present invention
Fig. 6 is emptying schematic flow sheet of the present invention
In figure:
1, source of the gas 2, air solenoid valve 3, gas circuit selector valve
4, pneumatic duplex pump 5, position limit switch 1, position limit switch two
7, liquid way reversing valve 8, pressure transducer 9, carbamide injection valve
10, urea box 11, control unit
4-1, left liquid cavity 4-2, the right air cavity of left air cavity 4-3
4-4, right liquid cavity 4-5, sliding linkage
Embodiment
Concrete structure of the present invention is illustrated in fig. 1 shown below, comprise urea box 10, source of the gas 1, pneumatic duplex pump 4, air solenoid valve 2, gas circuit selector valve 3, liquid way reversing valve 7, the control unit 11 of jet pressure are provided, and the gas piping, urea pipe and the automatically controlled circuit that play connection function.
Source of the gas 1 is connected with the air cavity of pneumatic duplex pump 4 by gas piping, connects the gentle way reversing valve 3 of air solenoid valve 2 on gas piping; Urea box 10 is connected with pneumatic duplex pump 4 by urea pipe respectively with carbamide injection valve 9, and liquid way reversing valve 7 is set on urea pipe.
The controlling component of system works is mainly comprised of control unit 11, air solenoid valve 2, gas circuit selector valve 3, pneumatic duplex pump 4, liquid way reversing valve 7.According to 2,3 and 7 cut-off and commutation logic, system realizes adds liquid, builds to press and the function such as spray, emptying.
The state definition of valve is as shown in table 1.
Table 1
When air solenoid valve 2 is opened (being controlled by ECU (Electrical Control Unit) 11), pressurized air enters gas circuit selector valve 3; According to the difference of gas circuit selector valve 3 valve body present positions, pressurized air enters left air cavity 4-2 or the right air cavity 4-3 of pneumatic duplex pump 4.When pressurized air enters left air cavity 4-2, under the effect of air pressure, the volume of left air cavity 4-2 increases, and the volume of left liquid cavity 4-1 is compressed, realizes the pressure of building of left liquid cavity 4-1.Meanwhile, under the effect of connecting rod, right air cavity 4-3 volume reduces, and right liquid cavity 4-4 volume increases, and pressure decreased, sucks right liquid cavity 4-4 by liquid.When the volume of left liquid cavity 4-1 reduces to after the limit (can according to position limit switch 5 and 6 judgements), the valve body switching position of air solenoid valve 2, pressurized air enters right air cavity 4-3, and now right liquid cavity 4-4 builds pressure, left liquid cavity 4-1 imbibition.
The workflow of system as shown in Figure 3, be divided into add liquid, build pressure, injection and emptying, wherein:
Adding liquid is that duplex pump sap cavity is inserted to liquid, and as shown in Figure 4, for pneumatic duplex pump left liquid cavity 4-1 adds liquid flow process, it is identical with it that right liquid cavity 4-4 adds liquid flow process to its process.
Building pressure is by the liquid pressing in sap cavity of duplex pump, and as shown in Figure 5, for pneumatic duplex pump left liquid cavity 4-1 builds pressure, sprays flow process, right liquid cavity 4-4 builds pressure to its process, injection flow process is identical with it.
Spray (by carbamide injection valve 9 cut-off realize) be when keeping jet pressure (break-make by air solenoid valve 2 is carried out pilot pressure), carry out as required the injection of urea liquid, its process is referring to Fig. 5.
Emptying be in the stopping process of system by system in residual urea liquid flow back to urea box, its process as shown in Figure 6, is the emptying flow process of pneumatic duplex pump left liquid cavity 4-1, the emptying flow process of right liquid cavity 4-4 is identical with it.
Above embodiments of the invention are had been described in detail, but described content is only preferred embodiment of the present invention, can not be considered to for limiting practical range of the present invention.All equalization variations of doing according to the scope of the invention and improvement etc., within all should still belonging to this patent covering scope.
Claims (5)
1. a pneumatic duplex metering injection system, it is characterized in that: comprise urea box, the source of the gas of jet pressure, pneumatic duplex pump, air solenoid valve, gas circuit selector valve, liquid way reversing valve, pressure transducer, control unit are provided, and the gas piping, urea pipe and the automatically controlled circuit that play connection function, pneumatic duplex pump comprises sap cavity, is arranged on the air cavity in sap cavity and is arranged on the sliding linkage in air cavity;
Source of the gas is connected with the air cavity of pneumatic duplex pump by gas piping, connects the gentle way reversing valve of air solenoid valve on gas piping; Urea box is connected with the sap cavity of pneumatic duplex pump both sides by urea pipe respectively with carbamide injection valve, and liquid way reversing valve is set on urea pipe.
2. pneumatic duplex metering injection system according to claim 1, is characterized in that: the urea pipe between liquid way reversing valve and carbamide injection valve is provided with pressure transducer.
3. pneumatic duplex metering injection system according to claim 1, is characterized in that: sap cavity is comprised of left liquid cavity and right liquid cavity, and air cavity is comprised of left air cavity and right air cavity.
4. pneumatic duplex metering injection system according to claim 3, is characterized in that: left air cavity and right air cavity are respectively provided with a position limit switch.
5. a method of work for pneumatic duplex metering injection system according to claim 3, is characterized in that:
When air solenoid valve is opened, pressurized air enters gas circuit selector valve, and according to the difference of gas circuit selector valve position, pressurized air enters left air cavity or the right air cavity of pneumatic duplex pump;
When pressurized air enters left air cavity, left air cavity expands, and compresses the volume of duplex pump left liquid cavity simultaneously, realizes the pressure of building of left liquid cavity; Meanwhile, under the effect of connecting rod, right air cavity volume shrinkage, right liquid cavity forms negative pressure, and liquid is sucked to right liquid cavity;
When the volume of left liquid cavity reduces to after the limit, gas circuit selector valve switching position, pressurized air enters right air cavity, and now right liquid cavity is built pressure, left liquid cavity imbibition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310547507.4A CN103603713A (en) | 2013-11-06 | 2013-11-06 | Pneumatic duplex measurement and injection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310547507.4A CN103603713A (en) | 2013-11-06 | 2013-11-06 | Pneumatic duplex measurement and injection system |
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| Publication Number | Publication Date |
|---|---|
| CN103603713A true CN103603713A (en) | 2014-02-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310547507.4A Pending CN103603713A (en) | 2013-11-06 | 2013-11-06 | Pneumatic duplex measurement and injection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111810331A (en) * | 2020-06-05 | 2020-10-23 | 东风商用车有限公司 | Gas-driven liquid fuel supply system and using method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1221136A (en) * | 1968-04-24 | 1971-02-03 | Gewerk Eisenhuette Westfalia | Improvements in or relating to liquid pumping devices |
| JPS6166681U (en) * | 1984-10-09 | 1986-05-07 | ||
| JPH0227178A (en) * | 1988-07-14 | 1990-01-29 | Sugino Mach Ltd | Display of pressure with pulsation of reciprocating pump or the like |
| JPH09170550A (en) * | 1995-12-15 | 1997-06-30 | Tlv Co Ltd | Steam pressure drive pump |
| CN201730780U (en) * | 2010-06-18 | 2011-02-02 | 宝鸡石油机械有限责任公司 | Hydraulically driven difunctional multi-cylinder slurry pump |
| CN102032029A (en) * | 2009-09-30 | 2011-04-27 | 中国第一汽车集团公司 | Urea solution supplying and spraying system |
| CN203532028U (en) * | 2013-11-06 | 2014-04-09 | 天津亿利汽车环保科技有限公司 | Pneumatic duplex measurement injecting system |
-
2013
- 2013-11-06 CN CN201310547507.4A patent/CN103603713A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1221136A (en) * | 1968-04-24 | 1971-02-03 | Gewerk Eisenhuette Westfalia | Improvements in or relating to liquid pumping devices |
| JPS6166681U (en) * | 1984-10-09 | 1986-05-07 | ||
| JPH0227178A (en) * | 1988-07-14 | 1990-01-29 | Sugino Mach Ltd | Display of pressure with pulsation of reciprocating pump or the like |
| JPH09170550A (en) * | 1995-12-15 | 1997-06-30 | Tlv Co Ltd | Steam pressure drive pump |
| CN102032029A (en) * | 2009-09-30 | 2011-04-27 | 中国第一汽车集团公司 | Urea solution supplying and spraying system |
| CN201730780U (en) * | 2010-06-18 | 2011-02-02 | 宝鸡石油机械有限责任公司 | Hydraulically driven difunctional multi-cylinder slurry pump |
| CN203532028U (en) * | 2013-11-06 | 2014-04-09 | 天津亿利汽车环保科技有限公司 | Pneumatic duplex measurement injecting system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111810331A (en) * | 2020-06-05 | 2020-10-23 | 东风商用车有限公司 | Gas-driven liquid fuel supply system and using method thereof |
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Application publication date: 20140226 |