CN204457961U - A kind of injection apparatus for aqueous solution of urea accurate measurement - Google Patents
A kind of injection apparatus for aqueous solution of urea accurate measurement Download PDFInfo
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- CN204457961U CN204457961U CN201520001343.XU CN201520001343U CN204457961U CN 204457961 U CN204457961 U CN 204457961U CN 201520001343 U CN201520001343 U CN 201520001343U CN 204457961 U CN204457961 U CN 204457961U
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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 utility model relates to a kind of injection apparatus for aqueous solution of urea accurate measurement, comprises air injection modules, urea-spray module, mixing arrangement; Air injection modules comprises the air solenoid valve controlling compressed-air actuated amount and break-make, and the stable air through air solenoid valve, at the air reducing valve of runner internal pressure, is ejected through the air injection check valve of the air of air reducing valve; Urea-spray module comprises the urea pump drawing aqueous solution of urea and inhales one-way valve, to inhale the urea-spray one-way valve that one-way valve is connected with urea pump, is arranged at the pressure transducer of the amount of also control injection aqueous solution of urea on urea-spray one-way valve; Mixing arrangement comprise mixing air spray the aqueous solution of urea that spray with urea-spray one-way valve of air of one-way valve ejection mixing runner, with the urea nozzle mixing runner and be connected the mixture in also jet mixing flow road.The consumption that the utility model structure is simple, can accurately control for the pressurized air needed for urea metering pump system and urea.
Description
Technical field
The utility model relates to engine exhaust post-processing technology field, particularly relates to a kind of injection apparatus for aqueous solution of urea accurate measurement.
Background technique
SCR (Selective Catalytic Reduction) is a kind of selective catalytic reduction technology, and SCR technology uses ammonia or aqueous solution of urea as reducing substances, under uniform temperature and catalyst action, utilizes ammonia or aqueous solution of urea by NO
xbe reduced to nitrogen and the water of environmental sound.Due to ammonia optionally preferential reductive NO under the effect of catalyzer
xand not prior to O
2reaction, therefore be called " selective catalytic reduction ".Ammonia is good reducing agent, but has very strong excitant, is not easy to directly use on automobile, and aqueous solution of urea is nontoxic, harmless, stable performance during storage, convenient transportation and do not have penetrating odor, therefore generally uses aqueous solution of urea as the reducing agent of vehicle-mounted SCR system.
Use SCR technology, then needing can being ejected into aqueous solution of urea accurate quantification in engine exhaust pipe, and makes it efficient and NO
xeffulent reacts under the effect of catalyzer.Therefore just need to provide atomising device that aqueous solution of urea is atomized in waste pipe.Traditional air-assisted SCR technology, accurately can not control to spray pressurized air consumption needed for metering pump system, have impact on metering pump and use excessive pressurized air thus affect air braking system; And the pressurized air that can not accurately control, the aqueous solution of urea be atomized in engine exhaust pipe can not well be uniformly distributed, and produces certain influence to the conversion efficiency of NOx.Further, if aqueous solution of urea uses complete not, be likely leaked in the environment of periphery, certain corrosion is caused to machinery equipment.Therefore need accurately to control the air be ejected in engine exhaust pipe, guarantee that aqueous solution of urea plays a role more uniformly and effectively in engine exhaust pipe.
Nitrogen oxide (NOx) discharge adopting selective catalytic reduction (SCR) technology to reduce diesel engine be most economical, be suitable for, the method for good reliability.Because ammonia is harmful gas, not there is not reduction reaction with NOx in the reducing agent too much sprayed into, and enters in air, cause secondary environmental pollution by the exhaust with diesel engine.Therefore how according to the operating mode of motor to the demand of aqueous solution of urea, realize accurate measurement and spray, seem of crucial importance.
Summary of the invention
For the problems referred to above, the technical problems to be solved in the utility model is to provide the air decompressor that a kind of structure is simple, can accurately control for pressurized air needed for urea metering pump system and amount of urea.
For achieving the above object, the utility model adopts following technological scheme: a kind of injection apparatus for aqueous solution of urea accurate measurement, comprises air injection modules, urea-spray module, mixing arrangement; Described air injection modules comprises the air solenoid valve controlling compressed-air actuated amount and control pressurized air break-make, the stable air through air solenoid valve, at the air reducing valve of runner internal pressure, is ejected through the air injection check valve of the air of air reducing valve; Described urea-spray module comprises the urea pump drawing aqueous solution of urea and inhales one-way valve, to inhale the urea-spray one-way valve that one-way valve is connected with urea pump, is arranged at the pressure transducer of the amount of also control injection aqueous solution of urea on urea-spray one-way valve; Described mixing arrangement comprise mixing air spray the aqueous solution of urea that spray with urea-spray one-way valve of air of one-way valve ejection mixing runner, with the urea nozzle mixing runner and be connected the mixture in also jet mixing flow road.
Preferably, described urea pump inhales the eccentric shaft that one-way valve comprises pump suction one-way valve lower body, one-way valve upper body inhaled by pump, plunger type diaphragm, one-way valve diaphragm, connecting rod, drivening rod move up and down; The liquid outlet opening that one-way valve lower body is provided with inlet opening and the ejection aqueous solution of urea sucking aqueous solution of urea inhaled by described pump, and described liquid outlet opening is connected with described urea-spray one-way valve; Described pump is inhaled one-way valve upper body and is sticked on pump suction one-way valve lower body, and described pump is inhaled on one-way valve upper body and offered the through hole be used in combination with inlet opening and liquid outlet opening respectively
iwith through hole
iI, groove one-way valve upper body being provided with the stored urea aqueous solution inhaled by described pump, described through hole
iwith through hole
iIbe arranged in groove; Described plunger type diaphragm arrangement is inhaled on one-way valve upper body in pump and also can be used with fit depressions; Described one-way valve diaphragm is oppositely arranged on inlet opening and through hole respectively
ibetween and liquid outlet opening and through hole
iIbetween to limit aqueous solution of urea one-way flow; Described connecting rod is fixedly installed on the top of plunger type diaphragm and plunger type diaphragm can be driven to move up and down in groove; The inside that described connecting rod prolongs the center line of its axis is provided with eccentric chamber, and described eccentric shaft is arranged in eccentric chamber.
Urea pump inhales one-way valve by eccentric shaft circular movement, and drivening rod and plunger type diaphragm pump, and the groove of plunger type diaphragm and one-way valve upper body forms vacuum space region.When plunger type diaphragm moves upward, now pump suction one-way valve is in suction urea process, and by the control of one-way valve diaphragm, aqueous solution of urea can only by inlet opening and through hole
ienter this vacuum area, make urea be full of vacuum space region; When plunger type diaphragm moves downward, pump is inhaled one-way valve and is in pump urea process, and by the control of one-way valve diaphragm, urea in vacuum space region is passed through through hole by plunger type diaphragm
iIpump with liquid outlet opening, enter in aqueous solution of urea accurate measurement injection apparatus runner and accurately control urea supply amount to reach.
Preferably, described urea-spray one-way valve comprises valve pocket, urea-spray nonreturn valve core, urea-spray check valve spring, spring seat, split washer, prevents aqueous solution of urea to reflux the O type circle of crystallization; Described valve pocket comprises urea-spray check valve body, check valve body; What described urea-spray check valve body is provided with aqueous solution of urea ejects fluid apertures; Described check valve body is fixed on one end of urea-spray check valve body, described check valve body is provided with the injection inlet opening of aqueous solution of urea; Described urea-spray nonreturn valve core is sleeved in valve pocket, one end of described urea-spray nonreturn valve core with spray inlet opening and be used in combination, the other end with eject fluid apertures and be used in combination; Described urea-spray check valve spring is placed on urea-spray nonreturn valve core, and described spring seat is arranged at check valve body end and is placed on urea-spray nonreturn valve core; One end of described urea-spray check valve spring is fixed on spring seat, and the other end is fixed near ejecting on the inwall of urea-spray check valve body of fluid apertures; Described urea-spray nonreturn valve core offers circular groove at check valve body end, and described split washer to be placed in circular groove and to be fixed together with spring seat, and described split washer is butted on the inwall of check valve body; Described O type circle is fixed on the injection liquid outlet end of urea-spray nonreturn valve core and closely cooperates with urea-spray nonreturn valve core.
Further, described urea-spray one-way valve also comprises urea-spray one-way valve block, described urea-spray one-way valve block is placed on the urea-spray nonreturn valve core of injection feed liquor nose end, described spring socket sleeve is on urea-spray one-way valve block, and described split washer and urea-spray one-way valve block, spring seat are fixed together.The shaft axis that better urea-spray nonreturn valve core can be limited to urea-spray one-way valve block by arranging urea-spray one-way valve block moves.
Further, described in eject fluid apertures be horn-like, described in eject fluid apertures is greater than inner opening diameter at the diameter of the outward opening of urea-spray check valve body.Trumpet-shapedly eject fluid apertures by arranging, can make O type circle more closely with eject fluid apertures and coordinate, better can prevent the refluence of aqueous solution of urea, namely prevent aqueous solution of urea in the middle of total, form crystallization so that blocking course of injection.
Urea liquid is after the pressurization of pump suction one-way valve is pumped, arrive urea-spray one-way valve through runner, urea enters urea-spray one-way valve inside by spraying inlet opening, applies pressure urea-spray nonreturn valve core is moved downward to one-way valve, valve opening, urea mixes from one-way valve ejection with air.After injection, urea-spray check valve spring applies reaction force to it, makes spool get back to original position, urea-spray closed check valve.
Preferably, the structure of described air injection check valve is identical with the structure of described urea-spray one-way valve.
Preferably, described air reducing valve comprises valve body, spool, Returnning spring, block; Described valve body offers suction port and air outlet, in described valve body, be provided with ante-chamber and the back cavity of connection; Described ante-chamber is provided with inlet hole, and described inlet hole is communicated with suction port; Described spool is positioned at ante-chamber and can be used in combination with inlet hole, and described Returnning spring is placed on spool, and one end of described Returnning spring is fixed on the face of the ante-chamber offering inlet hole, and the other end is fixed on spool; Described ante-chamber is provided with in the end near back cavity the O RunddichtringO coordinated with seal spool
i; Described spool is provided with the position limiting slide block controlling inlet hole and valve core chamber distance in the end of back cavity, described position limiting slide block is positioned at back cavity; Described block is positioned at position limiting slide block away from the side of ante-chamber and is fixed on back cavity; Described spool is provided with position limiting slide block inside the sluice way be communicated with ante-chamber; Described sluice way is communicated with air outlet; Described air solenoid valve is arranged between suction port and inlet hole, and described solenoid valve is arranged on valve body.
Further, be also provided with throttle orifice between described sluice way and air outlet, described throttle orifice is positioned on valve body.Described throttle orifice is positioned on valve body.Throttle orifice plays second level decompression, and pressure air obtains being stabilized in goal pressure after two-stage decompression.
Further, described back cavity be provided with near one end of ante-chamber release after the bleeder port of intracavity gas.By arranging bleeder port, the pressure keeping with the external world in the back cavity at position limiting slide block place balancing can be made, be convenient to the motion of position limiting slide block.
Further, described position limiting slide block is provided with back cavity chamber wall with the use of O RunddichtringO
iI.The circlip for hole of fixed stop is provided with in described back cavity.By arranging O RunddichtringO
iwith O RunddichtringO
iIplaying the good seal action of air, by arranging circlip for hole, block can be fixed in back cavity, to limit the motion of position limiting slide block.
The preferred aluminum alloy of metallic material of the present utility model, because aqueous solution of urea is alkalescent, this metal has good anticorrosive property after carrying out surface treatment; This metal also has good thermal conductivity, can form radiator when temperature is too high.Can be heated it by heating equipment when this unit temp is too low.
Working principle of the present utility model is as follows:
Air solenoid valve controls high pressure admission mouth break-make, and high-pressure air enters mixing runner by air injection check valve ejection after air reducing valve reduces pressure certain pressure; Urea pump is inhaled one-way valve and is extracted out by urea liquid container by aqueous solution of urea, sprays urea and enters mixing runner, and in runner, carry out gas-liquid mixed with pressurized air by urea-spray one-way valve, sprays enter in Vehicular exhaust pipe after mixing through urea nozzle.Urea pump inhales one-way valve and urea-spray one-way valve controls urea supply precision.
Compared with prior art, a kind of injection apparatus structure for aqueous solution of urea accurate measurement of the present utility model simple, accurately can control for the pressurized air needed for urea metering pump system and urea consumption.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the structural representation that urea pump of the present utility model inhales one-way valve;
Fig. 3 is the structural representation of urea-spray one-way valve of the present utility model;
Fig. 4 is the structural representation of air injection modules of the present utility model;
In figure: 1, air solenoid valve; 2, air reducing valve; 3, air injection check valve; 4, urea pump inhales one-way valve; 5, urea-spray one-way valve; 6, pressure transducer; 7, runner is mixed; 8, urea nozzle; 9, one-way valve lower body inhaled by pump; 10, one-way valve upper body inhaled by pump; 11, plunger type diaphragm; 12, one-way valve diaphragm; 13, connecting rod; 14, eccentric shaft; 15, inlet opening; 16, liquid outlet opening; 17, through hole
i; 18, through hole
iI; 19, groove; 20, eccentric chamber; 21, urea-spray nonreturn valve core; 22, urea-spray check valve spring; 23, spring seat; 24, split washer; 25, O type circle; 26, urea-spray check valve body; 27, check valve body; 28, fluid apertures is ejected; 29, inlet opening is sprayed; 30, circular groove; 31, urea-spray one-way valve block; 32, valve body; 33, spool; 34, Returnning spring; 35, block; 36, suction port; 37, air outlet; 38, ante-chamber; 39, back cavity; 40, inlet hole; 41, circlip for hole; 42, position limiting slide block; 43, sluice way; 44, throttle orifice; 45, bleeder port; 46, O RunddichtringO
i; 47, O RunddichtringO
iI; 48 urea liquid containers.
Embodiment
Below in conjunction with embodiment, model utility content of the present utility model is described in further detail.Should understand, embodiment of the present utility model is unrestricted the utility model for illustration of the utility model only, when not departing from the utility model technological thought, according to ordinary skill knowledge and customary means, the various replacement made and change, all should be included in scope of the present utility model.
As shown in Figure 1, a kind of injection apparatus for aqueous solution of urea accurate measurement, is characterized in that: comprise air injection modules, urea-spray module, mixing arrangement; Described air injection modules comprises the air solenoid valve 1 controlling compressed-air actuated amount and control pressurized air break-make, the stable air through air solenoid valve 1, at the air reducing valve 2 of runner internal pressure, is ejected through the air injection check valve 3 of the air of air reducing valve 2; Described urea-spray module comprises the urea pump drawing aqueous solution of urea and inhales one-way valve 4, to inhale the urea-spray one-way valve 5 that one-way valve 4 is connected with urea pump, is arranged at the pressure transducer 6 of the amount of also control injection aqueous solution of urea on urea-spray one-way valve 5; Described mixing arrangement comprise mixing air spray the aqueous solution of urea that spray with urea-spray one-way valve 5 of air that one-way valve 3 sprays mixing runner 7, with the urea nozzle 8 mixing runner 7 and be connected the mixture in also jet mixing flow road 7.
Described urea pump is inhaled one-way valve 4 and is comprised the eccentric shaft 14 that one-way valve lower body 9 inhaled by pump, one-way valve upper body 10 inhaled by pump, plunger type diaphragm 11, one-way valve diaphragm 12, connecting rod 13, drivening rod 13 move up and down; Described pump is inhaled one-way valve lower body 9 and is provided with the inlet opening 15 and the liquid outlet opening 16 of ejection aqueous solution of urea that suck aqueous solution of urea, and described liquid outlet opening 16 is connected with described urea-spray one-way valve 5; Described pump is inhaled one-way valve upper body 10 and is sticked on pump suction one-way valve lower body 9, and described pump is inhaled on one-way valve upper body 10 and offered the through hole be used in combination with inlet opening 15 and liquid outlet opening 16 respectively
i17 and through hole
iI18, the groove 19 one-way valve upper body 10 being provided with the stored urea aqueous solution inhaled by described pump, described through hole
i17 and through hole
iI18 are arranged in groove 19; Described plunger type diaphragm 11 is arranged on pump suction one-way valve upper body 10 and also can be used in combination with groove 19; Described one-way valve diaphragm 12 is oppositely arranged on inlet opening 15 and through hole respectively
ibetween 17 and liquid outlet opening 16 and through hole
iIto limit aqueous solution of urea one-way flow between 18; Described connecting rod 13 is fixedly installed on the top of plunger type diaphragm 11 and plunger type diaphragm 11 can be driven to move up and down in groove 19; The inside that described connecting rod 13 prolongs the center line of its axis is provided with eccentric chamber 20, and described eccentric shaft 14 is arranged in eccentric chamber 20.
As shown in Figure 2, described urea-spray one-way valve 5 comprises valve pocket, urea-spray nonreturn valve core 21, urea-spray check valve spring 22, spring seat 23, split washer 24, prevents aqueous solution of urea to reflux the O type circle 25 of crystallization; Described valve pocket comprises urea-spray check valve body 26, check valve body 27; What described urea-spray check valve body 26 is provided with aqueous solution of urea ejects fluid apertures 28; Described check valve body 27 is fixed on one end of urea-spray check valve body 26, described check valve body 27 is provided with the injection inlet opening 29 of aqueous solution of urea; Described urea-spray nonreturn valve core 21 is sleeved in valve pocket, one end of described urea-spray nonreturn valve core 21 with spray inlet opening 29 and be used in combination, the other end with eject fluid apertures 28 and be used in combination; Described urea-spray check valve spring 22 is placed on urea-spray nonreturn valve core 21, and described spring seat 23 is arranged at check valve body 27 end and is placed on urea-spray nonreturn valve core 21; One end of described urea-spray check valve spring 22 is fixed on spring seat 23, and the other end is fixed near ejecting on the inwall of urea-spray check valve body 26 of fluid apertures 28; Described urea-spray nonreturn valve core 21 offers circular groove 30 at check valve body 27 end, and described split washer 24 to be placed in circular groove 30 and to be fixed together with spring seat 23, and described split washer 24 is butted on the inwall of check valve body 27; Described O type circle 25 is fixed on the injection liquid outlet end of urea-spray nonreturn valve core 21 and closely cooperates with urea-spray nonreturn valve core 21.
As shown in Figure 3, described urea-spray one-way valve 5 also comprises urea-spray one-way valve block 31, described urea-spray one-way valve block 31 is placed on the urea-spray nonreturn valve core 21 of injection inlet opening 29 end, described spring seat 23 is placed on urea-spray one-way valve block 31, and described split washer 24 is fixed together with urea-spray one-way valve block 31, spring seat 23.The described fluid apertures 28 of ejecting for horn-like, described in eject fluid apertures 28 is greater than inner opening diameter at the diameter of the outward opening of urea-spray check valve body 26.
The structure of described air injection check valve 3 is identical with the structure of described urea-spray one-way valve 5.
As shown in Figure 4, described air reducing valve 2 comprises valve body 32, spool 33, Returnning spring 34, block 35; Described valve body 32 offers suction port 36 and air outlet 37, in described valve body 32, be provided with ante-chamber 38 and the back cavity 39 of connection; Described ante-chamber 38 is provided with inlet hole 40, and described inlet hole 40 is communicated with suction port 36; Described spool 33 is positioned at ante-chamber 38 and can be used in combination with inlet hole 40, and described Returnning spring 34 is placed on spool 33, and one end of described Returnning spring 34 is fixed on the face of the ante-chamber 38 offering inlet hole 40, and the other end is fixed on spool 33; Described ante-chamber 38 is provided with in the end near back cavity 39 the O RunddichtringO be sealed and matched with spool 33
i 46; Described spool 33 is provided with the position limiting slide block 42 controlling inlet hole 40 and spool 33 spacing in the end of back cavity 39, described position limiting slide block 42 is positioned at back cavity 39; Described block 35 is positioned at position limiting slide block 42 away from the side of ante-chamber 38 and is fixed on back cavity 39; Described spool 33 is provided with position limiting slide block 42 inside the sluice way 43 be communicated with ante-chamber 38; Described sluice way 43 is communicated with air outlet 37; Described air solenoid valve 1 is arranged between suction port 36 and inlet hole 40, and described solenoid valve is arranged on valve body 32.
Also be provided with throttle orifice 44 between described sluice way 43 and air outlet 37, described throttle orifice 44 is positioned on valve body 32.Described back cavity 39 is provided with in the one end near ante-chamber 38 bleeder port 45 releasing gas in back cavity 39.Described position limiting slide block 42 is provided with back cavity 39 chamber wall with the use of O RunddichtringO
iI47; The circlip for hole 41 of fixed stop 35 is provided with in described back cavity 39.
Air solenoid valve 1 controls high pressure admission mouth 36 break-make, and high-pressure air enters mixing runner 7 by air injection check valve 3 ejection after air reducing valve 2 reduces pressure certain pressure; Urea pump is inhaled one-way valve 4 and is extracted out by urea liquid container 48 by aqueous solution of urea, sprays urea and enters mixing runner 7, and in runner, carry out gas-liquid mixed with pressurized air by urea-spray one-way valve 5, sprays enter in Vehicular exhaust pipe after mixing through urea nozzle 8.Urea pump is inhaled one-way valve 4 and is controlled urea supply precision with urea-spray one-way valve 5.
Claims (10)
1. for an injection apparatus for aqueous solution of urea accurate measurement, it is characterized in that: comprise air injection modules, urea-spray module, mixing arrangement; Described air injection modules comprises the air solenoid valve (1) controlling compressed-air actuated amount and control pressurized air break-make, the stable air through air solenoid valve (1), at the air reducing valve (2) of runner internal pressure, is ejected through the air injection check valve (3) of the air of air reducing valve (2); Described urea-spray module comprises the urea pump drawing aqueous solution of urea and inhales one-way valve (4), to inhale the urea-spray one-way valve (5) that one-way valve (4) is connected with urea pump, is arranged at urea-spray one-way valve (5) and goes up and the pressure transducer (6) controlling the amount of injection aqueous solution of urea; Described mixing arrangement comprise mixing air spray the aqueous solution of urea that one-way valve (3) air that sprays sprays with urea-spray one-way valve (5) mixing runner (7), with the urea nozzle (8) mixing runner (7) and be connected the mixture in also jet mixing flow road (7).
2. a kind of injection apparatus for aqueous solution of urea accurate measurement according to claim 1, is characterized in that: described urea pump is inhaled one-way valve (4) and comprised the eccentric shaft (14) that one-way valve lower body (9) inhaled by pump, one-way valve upper body (10) inhaled by pump, plunger type diaphragm (11), one-way valve diaphragm (12), connecting rod (13), drivening rod (13) move up and down; The liquid outlet opening (16) that one-way valve lower body (9) is provided with inlet opening (15) and the ejection aqueous solution of urea sucking aqueous solution of urea inhaled by described pump, and described liquid outlet opening (16) is connected with described urea-spray one-way valve (5); Described pump is inhaled one-way valve upper body (10) and is sticked on pump suction one-way valve lower body (9), and described pump is inhaled on one-way valve upper body (10) and offered the through hole be used in combination with inlet opening (15) and liquid outlet opening (16) respectively
iand through hole (17)
iI(18), the groove (19) one-way valve upper body (10) being provided with the stored urea aqueous solution inhaled by described pump, described through hole
iand through hole (17)
iI(18) be arranged in groove (19); Described plunger type diaphragm (11) is arranged at pump suction one-way valve upper body (10) and above also can be used in combination with groove (19); Described one-way valve diaphragm (12) is oppositely arranged on inlet opening (15) and through hole respectively
i(17) between and liquid outlet opening (16) and through hole
iI(18) to limit aqueous solution of urea one-way flow between; Described connecting rod (13) is fixedly installed on the top of plunger type diaphragm (11) and plunger type diaphragm (11) can be driven to move up and down in groove (19); The inside that described connecting rod (13) prolongs the center line of its axis is provided with eccentric chamber (20), and described eccentric shaft (14) is arranged in eccentric chamber (20).
3. a kind of injection apparatus for aqueous solution of urea accurate measurement according to claim 1, is characterized in that: described urea-spray one-way valve (5) comprises valve pocket, urea-spray nonreturn valve core (21), urea-spray check valve spring (22), spring seat (23), split washer (24), prevent aqueous solution of urea to reflux the O type circle (25) of crystallization; Described valve pocket comprises urea-spray check valve body (26), check valve body (27); What described urea-spray check valve body (26) is provided with aqueous solution of urea ejects fluid apertures (28); Described check valve body (27) is fixed on one end of urea-spray check valve body (26), described check valve body (27) is provided with the injection inlet opening (29) of aqueous solution of urea; Described urea-spray nonreturn valve core (21) is sleeved in valve pocket, one end of described urea-spray nonreturn valve core (21) with spray inlet opening (29) and be used in combination, the other end with eject fluid apertures (28) and be used in combination; Described urea-spray check valve spring (22) is placed on urea-spray nonreturn valve core (21), and described spring seat (23) is arranged at check valve body (27) and holds and be placed on urea-spray nonreturn valve core (21); One end of described urea-spray check valve spring (22) is fixed on spring seat (23), and the other end is fixed near ejecting on the inwall of urea-spray check valve body (26) of fluid apertures (28); Described urea-spray nonreturn valve core (21) offers circular groove (30) at check valve body (27) end, described split washer (24) to be placed in circular groove (30) and to be fixed together with spring seat (23), and described split washer (24) is butted on the inwall of check valve body (27); Described O type circle (25) is fixed on the injection liquid outlet end of urea-spray nonreturn valve core (21) and is closely cooperated with urea-spray nonreturn valve core (21).
4. a kind of injection apparatus for aqueous solution of urea accurate measurement according to claim 3, it is characterized in that: described urea-spray one-way valve (5) also comprises urea-spray one-way valve block (31), described urea-spray one-way valve block (31) is placed on sprays on inlet opening (29) the urea-spray nonreturn valve core (21) held, described spring seat (23) is placed on urea-spray one-way valve block (31), and described split washer (24) and urea-spray one-way valve block (31), spring seat (23) are fixed together.
5. a kind of injection apparatus for aqueous solution of urea accurate measurement according to claim 3, it is characterized in that: described in eject fluid apertures (28) for horn-like, described in eject fluid apertures (28) is greater than inner opening diameter at the diameter of the outward opening of urea-spray check valve body (26).
6. a kind of injection apparatus for aqueous solution of urea accurate measurement according to claim 1, is characterized in that: the structure of described air injection check valve (3) is identical with the structure of described urea-spray one-way valve (5).
7. a kind of injection apparatus for aqueous solution of urea accurate measurement according to claim 1, is characterized in that: described air reducing valve (2) comprises valve body (32), spool (33), Returnning spring (34), block (35); Described valve body (32) offers suction port (36) and air outlet (37), in described valve body (32), be provided with the ante-chamber (38) of connection and back cavity (39); Described ante-chamber (38) is provided with inlet hole (40), described inlet hole (40) is communicated with suction port (36); Described spool (33) is positioned at ante-chamber (38) and can be used in combination with inlet hole (40), described Returnning spring (34) is placed on spool (33), one end of described Returnning spring (34) is fixed on the face of the ante-chamber (38) offering inlet hole (40), and the other end is fixed on spool (33); Described ante-chamber (38) is provided with in the end near back cavity (39) the O RunddichtringO be sealed and matched with spool (33)
i(46); Described spool (33) is provided with the position limiting slide block (42) controlling inlet hole (40) and spool (33) spacing in the end of back cavity (39), described position limiting slide block (42) is positioned at back cavity (39); Described block (35) is positioned at position limiting slide block (42) away from the side of ante-chamber (38) and is fixed on back cavity (39); Described spool (33) and position limiting slide block (42) inside are provided with the sluice way (43) be communicated with ante-chamber (38); Described sluice way (43) is communicated with air outlet (37); Described air solenoid valve (1) is arranged between suction port (36) and inlet hole (40), and described solenoid valve is arranged on valve body (32).
8. a kind of injection apparatus for aqueous solution of urea accurate measurement according to claim 7, it is characterized in that: be also provided with throttle orifice (44) between described sluice way (43) and air outlet (37), described throttle orifice (44) is positioned on valve body (32).
9. a kind of injection apparatus for aqueous solution of urea accurate measurement according to claim 7, is characterized in that: described back cavity (39) is provided with in the one end near ante-chamber (38) bleeder port (45) releasing gas in back cavity (39).
10. a kind of injection apparatus for aqueous solution of urea accurate measurement according to claim 7, is characterized in that: described position limiting slide block (42) is provided with back cavity (39) chamber wall with the use of O RunddichtringO
iI(47); The circlip for hole (41) of fixed stop (35) is provided with in described back cavity (39).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520001343.XU CN204457961U (en) | 2015-01-04 | 2015-01-04 | A kind of injection apparatus for aqueous solution of urea accurate measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520001343.XU CN204457961U (en) | 2015-01-04 | 2015-01-04 | A kind of injection apparatus for aqueous solution of urea accurate measurement |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| WO2017114013A1 (en) * | 2015-12-31 | 2017-07-06 | 天纳克（苏州）排放系统有限公司 | Urea nozzle |
| CN108930573A (en) * | 2017-05-27 | 2018-12-04 | 罗伯特·博世有限公司 | Aqueous solution of urea feed system and the method for controlling the pressure oscillation in the system |
| WO2020049131A1 (en) * | 2018-09-07 | 2020-03-12 | Delphi Technologies Ip Limited | A pump module for a dosing system and a non-return valve assembly therefor |
-
2015
- 2015-01-04 CN CN201520001343.XU patent/CN204457961U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017114013A1 (en) * | 2015-12-31 | 2017-07-06 | 天纳克（苏州）排放系统有限公司 | Urea nozzle |
| 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 |
| CN108930573A (en) * | 2017-05-27 | 2018-12-04 | 罗伯特·博世有限公司 | Aqueous solution of urea feed system and the method for controlling the pressure oscillation in the system |
| WO2020049131A1 (en) * | 2018-09-07 | 2020-03-12 | Delphi Technologies Ip Limited | A pump module for a dosing system and a non-return valve assembly therefor |
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