CN102953787B - Dual-pump type reducer jetting and supplying device - Google Patents
Dual-pump type reducer jetting and supplying device Download PDFInfo
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- CN102953787B CN102953787B CN201210492675.3A CN201210492675A CN102953787B CN 102953787 B CN102953787 B CN 102953787B CN 201210492675 A CN201210492675 A CN 201210492675A CN 102953787 B CN102953787 B CN 102953787B
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- reducing agent
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Abstract
The invention discloses a dual-pump type reducer jetting and supplying device. The device comprises a reducer storing box, a motor, a driving pump and a pressure accommodating cavity, wherein the motor drives the driving pump to convey a reducer in the reducer storing box to the pressure accommodating cavity to be jetted. The device is characterized in that the driving pump is a dual-pump device consisting of a supply pump and a reverse pumping pump; and the same motor respectively and independently conveys the reducer in the reducer storing box to the pressure accommodating cavity through positive rotation and negative rotation and reversely pumps the reducer in the pressure accommodating cavity to the reducer storing box to be stored. Compared with an inlet-outlet pipe switching device with a two-position and four-way valve, the reverse pumping pump has the advantages of simple structure, high reliability, and capability of reducing the number of parts and reducing cost.
Description
Technical field
The present invention relates to a kind of double-pump type reducing agent and spray feeding mechanism, the injection for liquid reducing agent supplies, all applicable to the exhaust gases of internal combustion engines reprocessing field with or without compressed air plant.
Background technique
Increasingly serious along with environmental problem and energy crisis; Abgasgesetz increasingly stringent; increasing energy-conserving and emission-cutting technology is applied in vehicle; wherein SCR(selective catalytic reduction) technology is a kind of method reducing oxynitride discharge, SCR technology is exactly by urea liquid, a kind of reducing agent; spray in outlet pipe; discharge ammonia, ammonia reacts with the oxynitrides in exhaust and generates nitrogen and water in SCR catalytic converter, thus purges the oxynitrides in exhaust.Because this reducing agent freezing point of urea liquid is-11 DEG C, when the temperature of external environment is lower than this temperature, urea liquid will crystallization, volumetric expansion and damage injection feeding mechanism, and therefore vehicle-mounted injection supply system needs automatically to empty after use terminates.
After urea solution jet supply system quits work, emptying of residual urea solution can be realized by two position four-way valves switching import and export runners, referenced patent DE102006033027.Because two position four-way valve number of spare parts are many, runner handoff procedure is complicated, especially in higher jet pressure lower seal difficulty, reduces system reliability.
Summary of the invention
The object of the invention is to provide the double-pump type reducing agent that a kind of structure is more simple, cost is lower, reliability is higher to spray feeding mechanism.
The present invention for achieving the above object, adopts following technological scheme:
A kind of double-pump type reducing agent sprays feeding mechanism, comprises reducing agent storage tank, motor, driven pump, pressure chamber; Reducing agent in reducing agent storage tank is transported to after pressure chamber to nozzle ejection by described driven by motor driven pump, it is characterized in that: the dual pump apparatus that described driven pump is made up of a supply pump and a back suction pump, same motor by rotate and reverse independently control for the reducing agent in reducing agent storage tank is transported to pressure chamber and by the reducing agent back suction in pressure chamber to reducing agent storage tank.
It is further characterized in that: described motor drives the live axle with the single direction rotation device that two are placed with opposite direction, and independent transmission drives to supply pump and back suction pump thus.
Further: in the back suction pipeline between the import of back suction pump and pressure chamber, to arrange a normal close type switch valve, for controlling the break-make of back suction pipeline; After injection supply stops, then switch valve is opened.
According to a kind of favourable structure, back suction pipeline is drawn from the bottom of pressure chamber.
According to a kind of favourable structure, between pressure chamber and reducing agent storage tank, be provided with return line, arrange a throttle orifice in described return line, and return line be from the Base top contact of pressure chamber.
According to a kind of favourable structure, pressure chamber is provided with pressure transducer and temperature transducer.
According to a kind of favourable structure, in pressure chamber, be provided with heating equipment.
Difference with the prior art of the present invention is: adopt double pump to realize the pressure of reducing agent jet delivery device and to empty function, be called supply pump and back suction pump.Supply pump, for extracting reducing agent, is set up and maintains the jet pressure of system; Back suction pump for spray supply stop after, the residual reducing agent in reverse emptying apparatus.
Compared with prior art beneficial effect is: the inlet/outlet pipe circuit switching device of two position four-way valves compared by back suction pump, and structure is simple, and reliability is high, can reduce number of spare parts, reduce costs.
Accompanying drawing explanation
Fig. 1 is the principle schematic that double-pump type reducing agent of the present invention sprays feeding mechanism.
Fig. 2 is the double pump structural representation that double-pump type reducing agent of the present invention sprays feeding mechanism.
Description of reference numerals: 1-reducing agent storage tank, 2-reducing agent, 3-single direction rotation device B, 4-back suction pump, 5-switch valve, 6-controller, 7-back suction pipeline, 8-nozzle, 9-sprays interface, 10-temperature transducer, 11-pressure transducer, 12-pressure chamber, the import of 13-engine coolant, 14-engine coolant refluxing opening, 15-resistance heater, 16-return line, 17-throttle orifice, 18-supply pump, 19-single direction rotation device A, 20-live axle, 21-motor, 22-motor shaft, 23-unilateral bearing A, 24-unilateral bearing B, 25-synchronous pulley.
Embodiment
Double-pump type reducing agent sprays a feeding mechanism as shown in Figure 1, comprises reducing agent storage tank 1, motor 21, driven pump, pressure chamber 12; Spray to nozzle 8 after described motor 21 drives driven pump that the reducing agent 2 in reducing agent storage tank 1 is transported to pressure chamber 12, the dual pump apparatus that described driven pump is made up of a supply pump 18 and a back suction pump 4, same motor 21 by rotate and reverse independently control for the reducing agent in reducing agent storage tank 1 is transported to pressure chamber 12 and by pressure chamber 12 reducing agent back suction to reducing agent storage tank 1.
According to the principle schematic of Fig. 1, the fundamental function of spraying feeding mechanism is described.Reducing agent 2 preferably adopts urea liquid, is stored in advance in reducing agent storage tank 1.The core component of this injection feeding mechanism is supply pump 18 and back suction pump 4, and preferred diaphragm pump, they rotarily drive work by live axle 20.
Specific embodiment motor 21 transmits torsion to live axle 20 by synchronous pulley 25 as shown in Figure 2, also can adopt other modes, if motor shaft 22 and live axle 20 are the same axis.Single direction rotation device A 19 and B 3 preferably adopts unilateral bearing 23,24, and live axle 20 drives supply pump 18 to work by unilateral bearing A 23, and same live axle 20 drives back suction pump 4 to work by unilateral bearing B 24.Because unilateral bearing A 23 is connected at described same live axle 20 upper driving with opposite direction with unilateral bearing B 24, therefore two unilateral bearing A 23, the torsion direction of transfer of unilateral bearing B 24 is contrary, thus realizes rotating and reverse of motor 21 and independently control supply pump 18 and back suction pump 4.
Specifically, when spraying feeding mechanism and being in injection supply status, motor 21 rotates forward, and only drive a supply pump 18 to work, now the urea liquid in reducing agent storage tank 1 pumps in pressure chamber 12 by supply pump 18.Because the switch valve 5 arranged in the back suction pipeline 7 between the now import of back suction pump 4 and pressure chamber 12 is in closed condition, after being full of urea liquid in pressure chamber 12, reducing agent 2 along return line 16, will be back to reducing agent storage tank 1 through throttle orifice 17 or is transported to nozzle 8 from the injection interface 9 be communicated with pressure chamber 12.Pressure transducer 11 is arranged in pressure chamber 12, is changed the rotating speed of motor 21 by pressure feedback to controller 6, for regulating the delivery volume of supply pump 18, makes pressure chamber 12 internal pressure keep constant.After injection supply stops, device enters empty, motor 21 reverses, now only drive the work of back suction pump, Simultaneous Switching valve 5 is energized by controller 6 and opens, because the bottom of back suction pipeline 7 from pressure chamber 12 is drawn, therefore in pressure chamber 12, urea liquid is all back to reducing agent storage tank 1 by under the auxiliary suction effect of back suction pump 4, the pressure monitored in pressure chamber 12 when pressure transducer 11 is less than barometric pressure, as degree of vacuum 5kpa, the running of motor 21 can be stopped, completing automatically emptying of this injection feeding mechanism.
When spraying feeding mechanism and working under the environment lower than urea liquid condensation point-11 DEG C, need to open heating and thaw.Pressure chamber 12 be provided with engine coolant import 13 and refluxing opening 14 or resistance heater 15 is set, with heat exchange pattern, heating being carried out to this injection feeding mechanism and thaw.The temperature transducer 10 be arranged in pressure chamber 12 can monitor the state of temperature of this device in real time, introduces the currency of engine coolant or the current"on"time of resistance heater 15 for controlling.
Claims (5)
1. double-pump type reducing agent sprays a feeding mechanism, comprises reducing agent storage tank, motor, driven pump, pressure chamber; Reducing agent in reducing agent storage tank is transported to after pressure chamber to nozzle ejection by described driven by motor driven pump, it is characterized in that: the dual pump apparatus that described driven pump is made up of a supply pump and a back suction pump, same motor by rotate and reverse independently control for the reducing agent in reducing agent storage tank is transported to pressure chamber and by the reducing agent back suction in pressure chamber to reducing agent storage tank;
A normal close type switch valve is arranged, for controlling the break-make of back suction pipeline in back suction pipeline between the import of back suction pump and pressure chamber; After injection supply stops, then switch valve is opened;
Back suction pipeline is drawn from the bottom of pressure chamber.
2. double-pump type reducing agent according to claim 1 sprays feeding mechanism, it is characterized in that: described motor drives the live axle with the single direction rotation device that two are placed with opposite direction, and independent transmission drives to supply pump and back suction pump thus.
3. double-pump type reducing agent according to claim 1 and 2 sprays feeding mechanism, it is characterized in that: between pressure chamber and reducing agent storage tank, be provided with return line, arrange a throttle orifice in described return line, and return line is from the Base top contact of pressure chamber.
4. double-pump type reducing agent according to claim 1 sprays feeding mechanism, it is characterized in that: pressure chamber is provided with pressure transducer and temperature transducer.
5. double-pump type reducing agent according to claim 1 sprays feeding mechanism, it is characterized in that: be provided with heating equipment in pressure chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210492675.3A CN102953787B (en) | 2012-11-28 | 2012-11-28 | Dual-pump type reducer jetting and supplying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210492675.3A CN102953787B (en) | 2012-11-28 | 2012-11-28 | Dual-pump type reducer jetting and supplying device |
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| Publication Number | Publication Date |
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| CN102953787A CN102953787A (en) | 2013-03-06 |
| CN102953787B true CN102953787B (en) | 2015-04-01 |
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| CN201210492675.3A Active CN102953787B (en) | 2012-11-28 | 2012-11-28 | Dual-pump type reducer jetting and supplying device |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103291579B (en) * | 2013-06-13 | 2015-09-16 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | A kind of driving mechanism of double pump |
| DE102017217891A1 (en) * | 2017-10-09 | 2019-04-11 | Robert Bosch Gmbh | Delivery module for conveying a fluid |
| DE102017223365A1 (en) * | 2017-12-20 | 2019-06-27 | Robert Bosch Gmbh | Method for operating a hydraulic system |
| CN109099155B (en) * | 2018-10-08 | 2021-04-06 | 重庆长安汽车股份有限公司 | DCT transmission double-pump system, control method and automobile |
| CN109340074B (en) * | 2018-10-18 | 2023-07-07 | 中国海洋石油集团有限公司 | Hydraulic control system |
| CN109589440A (en) * | 2018-12-27 | 2019-04-09 | 广州玖的数码科技有限公司 | A kind of smell renderer |
| CN109915240A (en) * | 2019-03-28 | 2019-06-21 | 陕西重型汽车有限公司 | A kind of urea system heating and cooling system |
| CN115400991B (en) * | 2022-08-24 | 2023-06-02 | 金陵科技学院 | Cleaning device for stress test |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8234854B2 (en) * | 2008-10-22 | 2012-08-07 | Caterpillar Inc. | System and method for heating a reducing agent associated with a reducing agent distribution system |
| CN101737127B (en) * | 2008-11-25 | 2012-01-25 | 无锡油泵油嘴研究所 | SCP urea injection system for post treatment of diesel engine emissions |
| CN201347788Y (en) * | 2009-01-14 | 2009-11-18 | 无锡市凯龙汽车设备制造有限公司 | Air-mixing metering system for exhaust-gas disposal of vehicle |
| DE102011002425A1 (en) * | 2011-01-04 | 2012-07-05 | Robert Bosch Gmbh | Conveying device for supplying an exhaust aftertreatment system of an internal combustion engine with a reducing agent and method |
| CN102758672A (en) * | 2011-04-29 | 2012-10-31 | 北京理工大学 | SCR (silicon controlled rectifier) pump nozzle device |
| CN202402109U (en) * | 2012-01-17 | 2012-08-29 | 博世汽车柴油系统股份有限公司 | Reducing agent supply module for vehicle and shell of reducing agent supply module |
| CN102733912B (en) * | 2012-06-29 | 2016-12-21 | 中国第一汽车股份有限公司 | The preparation of a kind of solid ammonia storage material for aftertreatment control unit and fill method |
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Effective date of registration: 20170613 Address after: 214063 Jiangsu province Binhu District of Wuxi City Qian Rong Lu No. 15 Patentee after: China FAW Group Corporation Address before: 214063 Jiangsu province Binhu District of Wuxi City Qian Rong Lu No. 15 Patentee before: Wuxi Oil Pump Nozzle Institute of First Automobile Works |