CN204386852U - A kind of urea pump control system - Google Patents
A kind of urea pump control system Download PDFInfo
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- CN204386852U CN204386852U CN201420838495.0U CN201420838495U CN204386852U CN 204386852 U CN204386852 U CN 204386852U CN 201420838495 U CN201420838495 U CN 201420838495U CN 204386852 U CN204386852 U CN 204386852U
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Abstract
The utility model relates to a kind of control system of urea pump, comprises electronic control unit, diaphragm pump, the first pressure transducer, the second pressure transducer, metering valve, buffer cavity, mixing chamber, one-way valve, the first solenoid valve, the second solenoid valve and housing; First solenoid valve is connected with one-way valve; First mixing chamber entrance of mixing chamber connects one-way valve, and the second mixing chamber entrance connects metering valve; First pressure transducer is positioned at the downstream of mixing chamber, and the second pressure transducer is between metering valve and buffer cavity; Second solenoid valve is between buffer cavity and urea tank and liquid level sensor assembly; Electronic control unit control urea pump system the initialization realizing urea pump system, note in advance, spray and empty urea liquid, by the control system of above urea pump can effectively solve diaphragm pump because of poor sealing cannot the problem of inspiration urea liquid, thus improve urea pump reliability, reduce costs; Urea pump control system of the present utility model can realize high accuracy of spray simultaneously.
Description
Technical field
The utility model relates to a kind of urea pump control system.
Background technique
In order to protection of the environment, countries in the world have put into effect the relevant laws and regulations controlling motor vehicle exhaust emission in succession, and more and more stricter Abgasgesetz makes simple emission controls by improving combustion technology be difficult to satisfy regulatory requirement, and the outer post-processing technology of machine must be relied on to be assisted.In the outer technical finesse of machine, current domestic Ge great diesel engine company and car load factory owner will adopt the discharged nitrous oxides of selective catalytic reduction system operating technical controlling diesel engine, and selective catalytic reduction system operating needs with urea pump from extracted urea solution urea box, and spray in air inlet-outlet pipe with certain precision, the controlling method of urea pump system of the present utility model can this technical requirements.
But, existing urea pump system technology primarily of the monopolization of part international business, and easily occur diaphragm pump because of poor sealing cannot the problem of inspiration urea liquid, part urea pump precision is not high, is difficult to meet state five and Europe six diesel emission standard.
Summary of the invention
The utility model aims to provide a kind of urea pump control system, its can effectively solve diaphragm pump because of poor sealing cannot the problem of inspiration urea liquid, thus improve urea pump reliability, reduce costs; Urea pump control system of the present utility model can realize high accuracy of spray simultaneously, can meet state five and Europe six emission standard.
The utility model for solving the problems of the technologies described above taked technological scheme is: a kind of controlling method of urea pump system, comprise electronic control unit, diaphragm pump, the first pressure transducer, the second pressure transducer, metering valve, buffer cavity, mixing chamber, one-way valve, the first solenoid valve, the second solenoid valve and housing; Described first solenoid valve is connected with described one-way valve by air passageways; Described mixing chamber has the first mixing chamber entrance, the second mixing chamber entrance and mixing chamber to export, first mixing chamber entrance connects described one-way valve, pressurized gas is provided to mixing chamber, second mixing chamber entrance connects described metering valve, to supply urea solution to mixing chamber, discharged by mixing chamber outlet after pressurized gas and urea liquid mixing; Described first pressure transducer is positioned at the downstream of mixing chamber, for monitoring the pressure of mixing chamber, described second pressure transducer between metering valve and buffer cavity, for detecting the pressure of urea liquid; Described second solenoid valve is between buffer cavity and urea tank and liquid level sensor assembly; The component that described electronic control unit controls urea pump system realize the initialization of urea pump system, note, spray and empty the function of urea liquid in advance.
Preferably, it is characterized in that: described one-way valve is ball valve.
Further, described one-way valve comprises upper cover, ball, sealed support, knob, seal ring, sealing gasket, spring and valve body, sealed support, knob, sealing gasket and valve body are cylindric, valve body has outside thread and, fixing on the housing by outside thread, knob has internal thread, internal thread coordinates with the outside thread on valve body, be pressed in valve body by sealed support, seal ring, sealing gasket, ball and spring, sealed support extends in valve body from knob, and sealing gasket is embedded on sealed support; Ball is pressed on spring by sealing gasket; Ball is pressed on sealing gasket by spring one end, and the other end is pressed on the step in valve body.
Further, described one-way valve preferred material is nylon or stainless steel or aluminium, also can be the material of other resistant to urea solution corrosion.
Preferably, described mixing chamber is cylindric, and described second mixing chamber entrance and mixing chamber outlet lay respectively at the two ends of the axle of mixing chamber,
Further, described first mixing chamber entrance is vertical with the axle of mixing chamber.
Preferably, described first mixing chamber entrance is vertical with the axle of mixing chamber.
Preferably, described housing there are buffer cavity entrance, the first buffer cavity outlet and the outlet of the second buffer cavity; In described buffer cavity, minimum surface height overhead will lower than buffer cavity entrance, the first buffer cavity outlet and the second buffer cavity outlet height overhead.
Further, described buffer cavity entrance connects diaphragm pump; Described first buffer cavity outlet connection second pressure transducer; Described second buffer cavity outlet connection second solenoid valve.
Preferably, described diaphragm pump comprises motor, camshaft, clutch shaft bearing, the second bearing, connecting rod, barrier film, the pump housing, valve seat, the second check valve sheet, the first check valve sheet, the first seal ring, the second seal ring, the 3rd seal ring and valve gap, and motor is fixed on the pump housing by clutch shaft bearing; Be connected with screw between motor with camshaft; Being communicated with the second bearing is fixed on camshaft; Barrier film is by being screwed on connecting rod; Barrier film and valve seat form a pump chamber; Valve seat is positioned at above the pump housing, and valve gap is positioned at above valve seat; First check valve sheet and the second check valve sheet are between valve seat and valve gap; First seal ring and the second seal ring are between valve gap and valve seat, and the 3rd seal ring is between valve seat and the pump housing; Bolt, through the through hole on pad, valve gap and valve, is assembled together with the embedded nut on the pump housing; Valve seat has inlet channel, to allow urea liquid or air to enter pump chamber from the liquid entering hole valve gap, valve gap has liquid port.
Accompanying drawing explanation
Urea pump control system is described in detail below in conjunction with accompanying drawing, wherein:
Fig. 1 is the fundamental diagram of the utility model example;
Fig. 2 is the sectional drawing of the utility model example diaphragm pump;
Fig. 3 and Fig. 4 is the one-way valve of the utility model example and the sectional drawing of mixing chamber;
Fig. 5 and Fig. 6 is sectional drawing and the schematic diagram of the buffer cavity of the utility model example;
Fig. 7 is the urea pump system initialization flowchart of the utility model example;
Fig. 8 is the fundamental diagram that the urea pump system of the utility model example is noted in advance;
Fig. 9 is that the urea pump system of the utility model example notes flow chart in advance;
Figure 10 is the fundamental diagram of the urea pump system injection urea liquid of the utility model example;
Figure 11 is the flow chart of the urea pump system injection urea liquid of the utility model example;
Figure 12 is the fundamental diagram that the urea pump system of the utility model example empties urea liquid;
Figure 13 is the flow chart that the urea pump system of the utility model example empties urea liquid.
Embodiment
Fig. 1 shows a kind of urea pump system 90.Urea pump system 90 mainly comprises electronic control unit 40, diaphragm pump 30, first pressure transducer 80, second pressure transducer 61, metering valve 60, buffer cavity 50, mixing chamber 81, one-way valve 65, first solenoid valve 64, second solenoid valve 41 and housing 95.Urea pump system 90 urea liquid used that works is preferably the urea for vehicle solution of high-purity urea of solution 32.5% and the deionized water of 67.5%, also can be applicable to other urea liquid.Compressed gas source 62 can be specially for the source of the gas of urea pump system 90, or the source of the gas on car load, or the source of the gas on motor.
As shown in Figure 2, diaphragm pump 30 comprises motor 1, camshaft 17, clutch shaft bearing 2, second bearing 3, connecting rod 4, barrier film 5, the pump housing 16, valve seat 6, second check valve sheet 7, first check valve sheet 8, first seal ring 12, second seal ring 13, the 3rd seal ring 15 and valve gap 9.Motor 1 is fixed on the pump housing 16 by clutch shaft bearing 2; Be connected with screw 18 between motor 1 with camshaft 17.Connecting rod 4 is fixed on camshaft 17 by the second bearing 3.Barrier film 5 is by being screwed on connecting rod 4.Barrier film 5 and valve seat 6 form a pump chamber 14.Valve seat 6 is positioned at above the pump housing 16, and valve gap 9 is positioned at above valve seat 6.First check valve sheet 8 and the second check valve sheet 7 are between valve seat 6 and valve gap 9.The first seal ring 12 between valve gap 9 and valve seat 6 and the second seal ring 13 seal, and prevent urea liquid to be leaked to the outside of diaphragm pump 30.Between valve seat 6 and the pump housing 16 the 3rd seal ring 15 seal, prevent urea liquid to be leaked to the outside of diaphragm pump 30.Bolt 11, through the through hole on pad 10, valve gap 9 and valve seat 6, is assembled together with the embedded nut on the pump housing 16.Valve seat 6 upper inlet runner 6b, enters pump chamber 14 to allow urea liquid or air from the liquid entering hole 9b valve gap 9.Valve gap 9 there is liquid port 9c, allow urea liquid or air from pump chamber 14 to be discharged to outside diaphragm pump 30.
What urea pump system 90 was used unidirectional 65 can be ball valve, also can be the one-way valve of other type.Fig. 3 shows a kind of ball valve structure.One-way valve 65 comprises upper cover 66, ball 67, sealed support 68, knob 69, seal ring 70, sealing gasket 71, spring 72, valve body 73.Sealed support 68, knob 69, sealing gasket 71 and valve body 73 is in cylindric.Valve body 73 there is outside thread 73b and 73c, be fixed on described housing 95 by outside thread 73b.Knob 69 has internal thread 69b, and internal thread 69b coordinates with the outside thread 73c on valve body 73, sealed support 68, seal ring 70, sealing gasket 71, ball 67 and spring 72 is pressed in valve body 73.Sealed support 68 extends in valve body 73 from knob 69, and sealing gasket 71 is embedded on sealed support 68; Ball 67 is pressed on spring 72 by sealing gasket 71; Ball 67 is pressed on sealing gasket 71 by spring 72 one end, and the other end is pressed on the step in valve body 73.The material of upper cover 66, sealed support 68, knob 69 and valve body 73 is preferably working of plastics, also can be other resistant to urea solution corrosion material.The material of ball 67 can be metal or pottery.Seal ring 70 is between upper cover 66 and housing 95, and seal ring 74 is between valve body 73 and housing 95.When pressurized gas enters one-way valve 65 from the first solenoid valve 64, ball 67 and spring 72 move to the direction away from sealing gasket 71, allow pressurized gas by valve body 73, then mixing chamber 81 is entered, this one-way valve can effectively prevent the urea liquid of mixing chamber from flowing back to air pipe line, prevents urea crystals.
As shown in Figure 4, mixing chamber 81 is columned, and the two ends of the central shaft of cylinder are the second mixing chamber entrance 81b and the mixing chamber outlet 81c of mixing chamber 81, and the side of the central shaft of cylinder is the first mixing chamber entrance 81a.Second mixing chamber entrance is connected with metering valve 60, and mixing chamber outlet 81c is connected with urea pipe quick inserting joint 96.First mixing chamber entrance 81a is connected with one-way valve 65 and air passageways 77, and air passageways 77 extends to the pressurized gas outlet port of the first solenoid valve 64.As preferably, the central axis of described first mixing chamber entrance 81a and mixing chamber 81.
As shown in Figure 5 and Figure 6, buffer cavity 50 is by the common enough chambeies of housing 95, filter 51, seal ring 52, cushion pad 53, buffer cover 54, vent valve 55 and seal ring 56.When practical set, cushion pad 53 is filled in the intermediate portion of filter 51, then tighten buffer cover 54, filter 51 and cushion pad 53 are fixed in housing 95 by the seal ring part compressed on cushion pad 53 by buffer cover 54; Again vent valve 55 filled in and be fixed in buffer cover 54.Housing 95 there is internal thread 95b, for assembling buffer cover 54; Need it is noted that, the internal thread 95b on housing 95 can need to make outside thread into according to technique, production or service.Housing 95 there is buffer cavity entrance 95c, the first buffer cavity outlet 95d as buffer cavity 50 and the second buffer cavity outlet 95e.Buffer cavity entrance 95c is connected with the liquid port 9c of diaphragm pump 30 by urea liquid pipeline.First buffer cavity outlet 95d is connected with the second pressure transducer 61, metering valve 60 by urea liquid pipeline, and the second buffer cavity outlet 95e is connected with the second solenoid valve 41.Be installed in after on car or relevant device in urea pump system 90, the liftoff surface recently of buffer cavity 50 is surperficial 95a of housing 95, surface 95a height overhead will lower than buffer cavity entrance 95c, the first buffer cavity outlet 95d and the second buffer cavity outlet 95e height overhead, and the height difference of specific requirement depends on the sampled data of urea pump system 90.
The controlling method of urea pump system 90 comprises Four processes: initialization, note in advance, spray urea liquid and empty urea liquid.
Fig. 7 shows the initialization procedure 280 of urea pump system 90.When after engine ignition, the work of urea pump system 90 moves on to process 282.In process 282, urea pump system 90 obtains the data of selective catalytic reduction system operating and correlated parts thereof, electronic control unit 40 pairs of internal software carry out data initialization, and check the circuit of the first pressure transducer 80, second pressure transducer 61 and other associated mechanical part; If the fault of being checked through, just move on to process 284 and report failure code; If no, just move on to 286 to complete initialization.
Fig. 8 is the schematic diagram that urea pump system 90 performs pre-note process.Fig. 9 shows the detailed process 300 that urea pump system 90 carries out pre-note.After urea pump system 90 completes initialization procedure 280 and confirms that urea pump system does not have fault, urea pump system 90 starts to note process 300 in advance.In process 300, condition 302 checks whether the component of selective catalytic reduction system operating are ready to, such as check whether urea liquid thaws, whether urea liquid liquid level is enough high, whether delivery temperature is enough high, whether NOx sensor is working properly, whether temperature transducer is working properly, if these conditions are also not ready for, continue executive condition 302.After selective catalytic reduction system operating is ready to, work moves on to process 303.In process 303, electronic control unit 40 starts diaphragm pump 30, when the motor 1 of diaphragm pump 30 rotates, drives the second bearing 3, connecting rod 4 and barrier film 5 to-and-fro motion by camshaft 17, thus changes the volume of pump chamber 14; When the volume of pump chamber 14 becomes large, produce negative pressure in pump chamber 14, by urea liquid or air inspiration diaphragm pump, when the volume of pump chamber 14 diminishes, the air in pump chamber 14 or urea liquid are discharged to outlet flow 9c.Urea liquid flows to buffer cavity 50 by urea liquid pipeline by buffer cavity entrance 95c from outlet flow 9c, then flows to the second pressure transducer 61 place.Diaphragm pump 30 works after a period of time, and the pressure at the second pressure transducer 61 place brings up to certain value, and specific works time length is sampled by actual exemplar and obtained, and then urea pump system 90 work moves on to condition 304.In condition 304, electronic control unit 40 judges the second pressure sensor value, if the force value of the second pressure transducer 61 is lower than normal range value, working procedure moves on to condition 305, otherwise working procedure moves on to process 308.The force value of the second pressure transducer 61 is because the sealing of diaphragm pump 30 inner body is good not lower than the possible cause of normal range value, causes urea liquid to be drawn onto in pump.In condition 305, whether the number of times that electronic control unit 40 detects the value judging the second pressure transducer 61 is less than stipulated number, if be less than stipulated number, then working procedure moves on to process 306, process 306 will open the first solenoid valve 64 and metering valve 60, now pressurized gas is successively by the first solenoid valve 64, air conduit 77, air conduit 69a, air conduit 73a and metering valve 60, then buffer cavity 50 is entered, enter into diaphragm pump 30 again, residual urea solution in buffer cavity 50 and other pipeline will be blown into diaphragm pump 30 by such pressurized gas, the urea liquid of these remnants can valve seat 6 in moistening diaphragm pump, valve block 7, valve block 8 and valve gap 9, improve the sealing between these parts, contribute to diaphragm pump 30 successfully urea liquid to be drawn onto in pump and to be discharged to the second pressure transducer 61 place.If judge that the number of times of the value of the second pressure transducer 61 exceedes stipulated number, work moves to process 307, and urea pump system 90 reports fault.
If the force value of the second pressure transducer 65 is not less than normal range (NR), work moves to process 308, and process 308 opens the first solenoid valve 64, and then work the condition that moves to 309.In condition 309, whether electronic control unit 40 detects the force value of the first pressure transducer 80 lower than normal range (NR), and if so, working procedure moves on to condition 310, otherwise working procedure moves on to condition 314.In condition 310, if motor has just been lighted a fire and judged that the force value of the first pressure transducer 80 is less than stipulated number lower than the number of times of normal range (NR), working procedure has moved on to process 311; Sufficiently long time if urea pump system 90 has worked and judge that the force value of the first pressure transducer 80 is less than stipulated number lower than the number of times of lower normal scope, working procedure also can move on to process 311.Process 311 closes the first solenoid valve 64, then working procedure moves on to process 312, process 312 opens metering valve 60 a period of time, to supply urea solution to mixing chamber 81, urea liquid is positioned at the urea crystals of mixing chamber 81 and one-way valve 65 for dissolving, the time of opening metering valve 60 determines according to actual parts image data; Then working procedure moves on to process 313, and process 313 opens the first solenoid valve, and urea liquid is blown out quick inserting joint 96 by pressurized gas, then judges that whether the force value of the first pressure transducer 80 is lower than normal range (NR) further.In condition 314, electronic control unit 40 judges whether the force value of the first pressure transducer 80 is positioned at normal range (NR), and if so, then process moves on to process 316, and urea pump system 90 completes pre-note; Otherwise move on to process 315, urea pump system 90 reports fault, then completes pre-note.
Figure 10 is the schematic diagram that urea pump system 90 performs course of injection.Figure 11 shows the detailed process 330 that urea pump system 90 sprays urea liquid.Complete pre-note in urea pump system 90 and after not having fault, can spray urea liquid, the quantity of spraying urea liquid depends on the requirement of motor or selective catalytic reduction system operating.In condition 332, urea pump system 90 wait-receiving mode, from the injection order of motor or selective catalytic reduction system operating, if do not received, then continues to wait for; If received, then working procedure moves on to process 334.In process 334, electronic control unit 40 opens metering valve 60, and urea liquid flows to mixing chamber 81 from the second pressure transducer 61 through metering valve 60, mixes with the pressurized gas entering mixing chamber 81 from one-way valve 65, then blown to quick inserting joint 96 and nozzle 85 by pressurized gas, enter outlet pipe.The urea liquid entering outlet pipe becomes ammonia, by with the reaction of nitrogen oxides in engine exhaust, nitrogen oxide is transformed into nitrogen and water, plays environmental-protection function; Urea pump system 90 controls the opening time of metering valve 60 according to the pressure difference at metering valve 60 two ends and the Flow characteristics of metering valve 60, so just can control urea solution jet amount.After the complete urea liquid of injection command injection, working procedure moves on to condition 335 and 342.
In condition 335, if the force value of the first pressure transducer 80 is lower than normal range (NR), then working procedure moves on to condition 336; Otherwise, move on to condition 340.In condition 336, sufficiently long time if urea pump system 90 has worked and judge that the force value of the first pressure transducer 80 is less than stipulated number lower than the number of times of normal range (NR), working procedure moves on to process 337; Otherwise, move on to process 341 and report fault.Process 337 closes the first solenoid valve 64, then working procedure moves on to process 338, process 338 opens metering valve 60 a period of time, to supply urea solution to mixing chamber 81, urea liquid is positioned at the urea crystals of mixing chamber 81 and one-way valve 65 for dissolving, the time of opening metering valve determines according to actual parts image data; Then working procedure moves on to process 339, and process 339 opens the first solenoid valve, and urea liquid is blown out quick inserting joint 96 by pressurized gas, and then working procedure retracts condition 335.In condition 340, electronic control unit 40 judges whether the force value of the first pressure transducer 80 is positioned at normal range (NR), and if so, then process moves on to process 343; Otherwise, move on to process 341.
Whether condition 342 detects urea pump system 90 has other fault to occur, if so, working procedure moves on to process 344, otherwise, move on to process 343.
After process 341 and 344 performs, urea solution jet terminates.In condition 333, if engine ignition switch is closed, urea solution jet also can be caused to terminate.
Figure 12 is the schematic diagram that urea pump system 90 performs cleanup process.Figure 13 shows the detailed process 350 that urea pump system 90 empties urea liquid.When urea pump system 90 detects that engine ignition switch is closed or urea pump system has a fault, start the urea liquid emptied in urea pump.In condition 352, if urea pump system finds that the force value of the second pressure transducer 61 is higher, illustrate in urea pump and have a large amount of urea liquids to need to empty, working procedure moves on to process 353; Otherwise, move on to condition 356.Process 353 opened for second solenoid valve 41 some seconds, allow the urea liquid be positioned in the second pressure transducer 61, buffer cavity 50 and relevant urea liquid pipeline to flow back to urea tank and liquid level sensor assembly 86 by the second solenoid valve 41, the time of opening the second solenoid valve 41 is by through assaying.Then working procedure moves on to process 354, process 354 opens metering valve 60 some seconds, allow the pressurized air of mixing chamber 81 by metering valve 60, further the urea liquid in the second pressure transducer 61, buffer cavity 50 and relevant urea liquid pipeline is blown back urea tank and liquid level sensor assembly 86, the time of opening metering valve 60 is by through assaying.Then working procedure moves on to process 355, and process 355 closes the second solenoid valve 41 and metering valve 60, and moves on to condition 356.Condition 356 judges whether engine ignition switch closes, if so, and moving process 357; Otherwise, empty urea liquid and terminate.Process 357 closes all component of urea pump 90, such as the first solenoid valve 64 and electronic control unit 40.
A kind of urea pump control system involved by the utility model is mainly applicable to the urea pump system of the vent systems injection urea liquid into diesel car, is also applicable to develop the liquor pump required for other field.
To sum up, the utility model is encyclopaedized by the above embodiments.But the utility model is not intended to be defined in above-described embodiment.When not departing from spirit and scope of the present utility model, the utility model has many different distortion.Such as according to engine works or car load factory needs, increase the control logic etc. controlling water break solenoid valve.
Claims (8)
1. a control system for urea pump, comprises electronic control unit, diaphragm pump, the first pressure transducer, the second pressure transducer, metering valve, buffer cavity, mixing chamber, one-way valve, the first solenoid valve, the second solenoid valve and housing; Described diaphragm pump, buffer cavity, metering valve are connected successively with mixing chamber; Described first solenoid valve is connected with described one-way valve by air conduit; Described mixing chamber has the first mixing chamber entrance, the second mixing chamber entrance and mixing chamber to export, first mixing chamber entrance connects described one-way valve, pressurized gas is provided to mixing chamber, second mixing chamber entrance connects described metering valve, to supply urea solution to mixing chamber, discharged by mixing chamber outlet after pressurized gas and urea liquid mixing; Described first pressure transducer is positioned at the downstream of mixing chamber, for monitoring the pressure of mixing chamber, described second pressure transducer between metering valve and buffer cavity, for detecting the pressure of urea liquid; Described second solenoid valve is between buffer cavity and urea tank and liquid level sensor assembly; The component that described electronic control unit controls urea pump system realize the initialization of urea pump system, note, spray and empty the function of urea liquid in advance.
2. the control system of urea pump according to claim 1, is characterized in that: described one-way valve is ball valve.
3. the control system of urea pump according to claim 2, it is characterized in that one-way valve comprises upper cover, ball, sealed support, knob, seal ring, sealing gasket, spring and valve body, sealed support, knob, sealing gasket and valve body are cylindric, valve body has outside thread and, fixing on the housing by outside thread, knob has internal thread, internal thread coordinates with the outside thread on valve body, sealed support, seal ring, sealing gasket, ball and spring are pressed in valve body, sealed support extends in valve body from knob, and sealing gasket is embedded on sealed support; Ball is pressed on spring by sealing gasket; Ball is pressed on sealing gasket by spring one end, and the other end is pressed on the step in valve body.
4. the control system of urea pump according to claim 1, is characterized in that: described mixing chamber is cylindric, and described second mixing chamber entrance and mixing chamber outlet lay respectively at the two ends of the central shaft of mixing chamber.
5. the control system of the urea pump according to claim 1 or 4, is characterized in that: the central axis of described first mixing chamber entrance and mixing chamber.
6. the control system of urea pump according to claim 1, is characterized in that: described housing has buffer cavity entrance, the first buffer cavity outlet and the outlet of the second buffer cavity; In described buffer cavity, minimum surface height is overhead lower than buffer cavity entrance, the first buffer cavity outlet and the second buffer cavity outlet height overhead.
7. the control system of urea pump according to claim 6, is characterized in that: described buffer cavity entrance connects diaphragm pump; Described first buffer cavity outlet connection second pressure transducer; Described second buffer cavity outlet connection second solenoid valve.
8. the control system of urea pump according to claim 1, it is characterized in that: diaphragm pump comprises motor, camshaft, clutch shaft bearing, the second bearing, connecting rod, barrier film, the pump housing, valve seat, the second check valve sheet, the first check valve sheet, the first seal ring, the second seal ring, the 3rd seal ring and valve gap, and motor is fixed on the pump housing by clutch shaft bearing; Be connected with screw between motor with camshaft; Being communicated with the second bearing is fixed on camshaft; Barrier film is by being screwed on connecting rod; Barrier film and valve seat form a pump chamber; Valve seat is positioned at above the pump housing, and valve gap is positioned at above valve seat; First check valve sheet and the second check valve sheet are between valve seat and valve gap; First seal ring and the second seal ring are between valve gap and valve seat, and the 3rd seal ring is between valve seat and the pump housing; Bolt, through the through hole on pad, valve gap and valve, is assembled together with the embedded nut on the pump housing; Valve seat has inlet channel, to allow urea liquid or air to enter pump chamber from the liquid entering hole valve gap, valve gap has liquid port.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420838495.0U CN204386852U (en) | 2014-12-26 | 2014-12-26 | A kind of urea pump control system |
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| CN201420838495.0U CN204386852U (en) | 2014-12-26 | 2014-12-26 | A kind of urea pump control system |
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| CN204386852U true CN204386852U (en) | 2015-06-10 |
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| CN201420838495.0U Expired - Fee Related CN204386852U (en) | 2014-12-26 | 2014-12-26 | A kind of urea pump control system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105626205A (en) * | 2016-03-15 | 2016-06-01 | 茵卡排放控制系统（江苏）有限公司 | Differential pressure type urea pump for SCR exhaust gas after-treatment |
| CN105626210A (en) * | 2016-03-15 | 2016-06-01 | 茵卡排放控制系统（江苏）有限公司 | Anti-blockage device for air way of measurement unit of SCR system |
| CN105756758A (en) * | 2016-02-25 | 2016-07-13 | 江苏大学 | Urea metering pump device and urea metering feeding method thereof |
| CN106593586A (en) * | 2016-11-29 | 2017-04-26 | 潍柴动力空气净化科技有限公司 | Urea injection device for engine SCR system |
| CN106837486A (en) * | 2016-12-27 | 2017-06-13 | 潍柴动力空气净化科技有限公司 | Gas helps formula urea injection system and gas to help formula method for urea injection control |
| CN109139202A (en) * | 2018-09-12 | 2019-01-04 | 潍柴动力股份有限公司 | Urea pump and SCR spraying system |
| CN115075928A (en) * | 2022-07-14 | 2022-09-20 | 东风商用车有限公司 | Method for improving urea injection system diagnosis robustness |
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2014
- 2014-12-26 CN CN201420838495.0U patent/CN204386852U/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105756758A (en) * | 2016-02-25 | 2016-07-13 | 江苏大学 | Urea metering pump device and urea metering feeding method thereof |
| CN105756758B (en) * | 2016-02-25 | 2018-08-21 | 江苏大学 | Urea dosing pump assembly and its urea measure supply method |
| CN105626205A (en) * | 2016-03-15 | 2016-06-01 | 茵卡排放控制系统（江苏）有限公司 | Differential pressure type urea pump for SCR exhaust gas after-treatment |
| CN105626210A (en) * | 2016-03-15 | 2016-06-01 | 茵卡排放控制系统（江苏）有限公司 | Anti-blockage device for air way of measurement unit of SCR system |
| CN105626205B (en) * | 2016-03-15 | 2018-03-16 | 茵卡排放控制系统（江苏）有限公司 | Differential urea pump for SCR exhaust aftertreatments |
| CN105626210B (en) * | 2016-03-15 | 2018-03-16 | 茵卡排放控制系统（江苏）有限公司 | SCR system metering units air road preventing clogging up device |
| CN106593586A (en) * | 2016-11-29 | 2017-04-26 | 潍柴动力空气净化科技有限公司 | Urea injection device for engine SCR system |
| CN106593586B (en) * | 2016-11-29 | 2019-07-05 | 潍柴动力股份有限公司 | A kind of urea injection apparatus for engine SCR system |
| CN106837486A (en) * | 2016-12-27 | 2017-06-13 | 潍柴动力空气净化科技有限公司 | Gas helps formula urea injection system and gas to help formula method for urea injection control |
| CN109139202A (en) * | 2018-09-12 | 2019-01-04 | 潍柴动力股份有限公司 | Urea pump and SCR spraying system |
| CN115075928A (en) * | 2022-07-14 | 2022-09-20 | 东风商用车有限公司 | Method for improving urea injection system diagnosis robustness |
| CN115075928B (en) * | 2022-07-14 | 2023-09-01 | 东风商用车有限公司 | Method for improving diagnostic robustness of urea injection system |
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Effective date of registration: 20180125 Address after: Room 8422, room No. 3, No. 3, Xijing Road, Badachu high tech park, Shijingshan District, Beijing Patentee after: Tak Rongzhi (Beijing) Environmental Protection Technology Research Institute Address before: No. 2, building 1712, Fengtai District, Beijing, Beijing Patentee before: Chen Qingdong |
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Granted publication date: 20150610 Termination date: 20201226 |