CN104074735B - The measuring pump liquid release control device of the after-treatment system of purifying internal combustion engine tail gas - Google Patents
The measuring pump liquid release control device of the after-treatment system of purifying internal combustion engine tail gas Download PDFInfo
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- CN104074735B CN104074735B CN201310052996.6A CN201310052996A CN104074735B CN 104074735 B CN104074735 B CN 104074735B CN 201310052996 A CN201310052996 A CN 201310052996A CN 104074735 B CN104074735 B CN 104074735B
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Abstract
The measuring pump liquid release control device of the after-treatment system of a kind of purifying internal combustion engine tail gas, including measuring pump housing, measuring pump cylinder body and the piston being arranged in cylinder body；Described piston is sequentially arranged above push rod, liquid relief valve support stick, liquid relief valve and cleaning rod；It is provided with piston in described measuring pump cylinder body and runs stop link stopper；It is provided with the slide block of hollow and the outer sap cavity cavity of hollow in the top measuring pump cylinder body of described piston operation stop link stopper；Cylinder space between described upper piston area and slide block constitutes measurement chamber；Space between described slide block and liquid relief valve bottom constitutes interim liquid storage cylinder.The present invention can greatly reduce the external world and help the impact of spray air pressure, it is possible to keep measuring pump measuring accuracy in air pressure range is sprayed in bigger helping.Simultaneously because double go out the design of sap cavity and the effect of push rod and cleaning rod measuring pump is not damaged because of urea crystals or affects normal work, considerably increase the practicality of measuring pump.
Description
Technical field
The present invention relates to a kind of measuring pump liquid release control device, especially relate to a kind of exhaust gases of internal combustion engines clean
The measuring pump liquid release control device of the after-treatment system changed.
Background technology
It is currently used for the urea injection system of diesel engine after treatment with gas auxiliary system as main flow, especially medium and heavy
Application on vehicle.Gas helps urea injection system to use brake compression air on vehicle to be source of the gas.Common do
Method is that compressed air (helping spray air) is caused urea measuring pump, the urea liquid discharged by measuring pump
Carry to nozzle, finally spray into the exhaust pipe of engine.This arrangement often makes the metering of measuring pump be subject to
Help interference and the impact of spray air pressure；Its main cause is because the extraneous pressure of measuring pump relief valve (i.e.
Help spray air pressure) change have impact on measuring pump liquid release valve open and close control.Specifically
Ground is said, is that the aspects such as the open amount of relief valve, unlatching duration, shut-in time and sealing can not reach
Design requirement.Existing technology (application number: 201010237685.3) is it cannot be guaranteed that measuring pump relief valve has
Enough constant open amounts and unlatching duration, especially release under the different external worlds helps spray air pressure
The open amount and the unlatching duration that put valve can not keep constant, cause metering seriously to be helped spray pressure shadow by the external world
Ring.It addition, measuring pump relief valve can not close valve closing before fluid pressure drops to and helps spray air pressure in time
Door, allowing air or the liquid that discharged flow backwards into measuring pump metering sap cavity is also common to affect meter
The problem of amount pump precision.It is true that maintain measuring pump precision can bear help spray air pressure range (window
Mouthful) size is one of most important index of this measuring pump.
Additionally, the measuring pump of prior art (application number: 201010247156.1) also has following FAQs:
1) unlatching of liquid relief valve purely squeezes by liquid, often encounters hydraulic-driven power and valve
The contradiction of back-moving spring elastic force.In general, if needing liquid relief valve to close in time, it is necessary to reset
Spring has higher coefficient of elasticity, the most harder spring.But strong back-moving spring makes valve needs
Powerful strength carrys out breakdown.Here it is a pair contradiction the most prominent.
2) in the place of liquid Yu contacting external air, such as liquid outlet, often due to moisture evaporation and
Urea liquid dehydration is caused to crystallize.Especially all the more so after vehicle is parked for a long time and do not used.If there is this
The situation of kind, liquid outlet passage or even liquid relief valve and the back-moving spring etc. of whole measuring pump all can be by solid-states
Urea is shut.At this moment, fully rely on the fluid pressure within pump and cannot open relief valve, also cannot be by liquid
Exit passageway is opened.
3) at cold weather, urea liquid can freeze, volumetric expansion.Do not hold if measuring pump is internal
Permitted the leeway of volumetric expansion, then some finer parts will be damaged.So vehicle just cannot
Park at arctic weather.
Summary of the invention
The technical problem to be solved in the present invention is to provide the meter of the after-treatment system of a kind of purifying internal combustion engine tail gas
Amount pump liquid release control device.This device uses the double valve design of biliquid chamber, and one of them cavity volume is variable,
Use push rod directly to push liquid relief valve open simultaneously, use cleaning rod to loosen the liquid outlet that may crystallize, solve
Contradiction between liquid relief valve of having determined open and close so that measuring pump can help spray air bigger
Pressure limit keeps good accuracy, and solves urea liquid and crystallize the series of problems brought.
For solving above-mentioned technical problem, the present invention adopts the following technical scheme that:
The measuring pump liquid release control device of the after-treatment system of a kind of purifying internal combustion engine tail gas, including metering
Pump case, measuring pump cylinder body and the piston being arranged in cylinder body；
Described piston is sequentially arranged above push rod, liquid relief valve support stick, liquid relief valve and cleaning rod；
It is provided with piston in described measuring pump cylinder body and runs stop link stopper, for limiting the stroke of piston, work as piston
Running and arrive top, i.e. touch piston and run stop link stopper, piston stops up, the most i.e. moves downward；
It is provided with outside slide block and the hollow of hollow in the top measuring pump cylinder body of described piston operation stop link stopper
Sap cavity cavity, described outer sap cavity cavity is fixed on measuring pump cylinder body internal upper part position；Described outer sap cavity cavity and
Slide block is connected by spring；
Cylinder space between described upper piston area and slide block constitutes measurement chamber；Described slide block and liquid relief valve
Space between bottom constitutes interim liquid storage cylinder；Sky between described liquid relief valve top and outer sap cavity cavity
Between constitute outer sap cavity；
The lower end of described push rod is fixed on piston, is provided with anti-return circle in the bottom of push rod, this anti-return circle
Formed when touching with slide block lower surface and seal, prevent the backflow of liquid；Described liquid relief valve passes through liquid
Relief valve return spring is connected with outer sap cavity cavity；Described cleaning rod lower end is fixed on liquid relief valve, separately
One end extends in liquid outlet passage.
Preferably, described outer sap cavity cavity bottom is provided with the fixed block of hollow, and described slide block passes through spring with solid
Determine block to connect.
Preferably, the top of described fixed block is provided with arc-shaped protrusions；Between convenience and liquid relief valve lower surface
Formed when contact and seal；
Preferably, the upper end of described measuring pump liquid release control device is fixing with compressed air piping to be connected,
And the compressed air of the liquid outlet passage of described measuring pump liquid release control device and compressed air piping
Passage directly communicates.
Preferably, described liquid relief valve support stick is the most right with the push rod being fixed on piston tip below
In.
Preferably, described piston is combined driving by Electromagnetic Drive, Spring driving or electromagnetic spring.
There is advantages that
1) present invention employs double go out sap cavity and biliquid release valve design.In measuring pump Internal Gauge chamber
Interior fluid pressure, in time just pressing to negative pressure conversion, remains in two valves of liquid release
Closing, the air blow back avoiding liquid or the external world discharged to greatest extent returns measuring pump metering
Chamber.
2) two have a volume to change in the sap cavity of releasing liquid, tie at urea liquid
During the long-pending increase of crystal, leaving volumetric expansion space for measuring pump inside, protection measuring pump internal part is the most impaired
Bad.
3) present invention adopts and utilizes mechanically or electrically magnetic force directly to back down liquid relief valve by a push rod, greatly
Decrease greatly it and open the power required for liquid relief valve, it also avoid possible urea crystals make this valve without
The defect that method is opened.
4) at liquid outlet, cleaning rod is installed to move with liquid release spool, can loosen and may deposit
Urea crystals, it is to avoid outlet shut by solid urea.
In sum, the measuring pump liquid release control device of the present invention can greatly reduce the external world and helps spray air
The impact of pressure, it is possible to keep measuring pump measuring accuracy in air pressure range is sprayed in bigger helping.Simultaneously
Due to double go out the design of sap cavity and the effect of push rod and cleaning rod measuring pump is not subject to because of urea crystals
To damaging or the normal work of impact, considerably increase the practicality of measuring pump.
Accompanying drawing explanation
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is described in further detail
Fig. 1 is the structural representation of existing a kind of measuring pump；
Fig. 2 is the structural representation of existing another kind of measuring pump；
Fig. 3 is a kind of structural representation of the present invention.
Detailed description of the invention
Embodiment 1
The word in the description orientation employed in hereafter " on ", D score, "left", "right" etc. be for
For bright convenience is based on the orientation shown in drawing in accompanying drawing, in actual device, these orientation are likely to be due to
The disposing way of device and different.
Shown in Figure 3, the measuring pump liquid release control of the after-treatment system of a kind of purifying internal combustion engine tail gas
Device, including measuring pump housing 100, measuring pump cylinder body 101 and the piston 102 being arranged in cylinder body；
Described piston 102 is sequentially arranged above push rod 103, liquid relief valve support stick 104, liquid release
Valve 105 and cleaning rod 106；Described liquid relief valve support stick 104 with below be fixed on piston 102
The same shaft assignment of push rod 103 on top, namely the two central axes；
It is provided with piston in described measuring pump cylinder body 101 and runs stop link stopper 107, for limiting piston 102
Stroke, arrives top when piston 102 runs, and i.e. touches piston and runs stop link stopper 107, piston 102
Stop up, the most i.e. move downward；
The slide block 108 of hollow it is provided with in the top measuring pump cylinder body 101 of described piston operation stop link stopper 107
With the outer sap cavity cavity 109 of hollow, described outer sap cavity cavity 109 is fixed on measuring pump cylinder body 101 internal upper part
Position；Described outer sap cavity cavity 109 and slide block 108 are connected by spring 110；In particular, described
Outer sap cavity cavity 109 bottom is provided with the fixed block 117 of hollow, and described spring 110 one end is fixedly connected on cunning
On block 108, the other end is fixedly connected on fixed block 117；The top of described fixed block 117 is provided with arc
Projection 122；Conveniently seal with being formed when contacting between liquid relief valve 105 lower surface；
Cylinder space between described piston 102 top and slide block 108 constitutes measurement chamber 111；Described slide block
Space between 108 and liquid relief valve 105 bottom constitutes interim liquid storage cylinder 112；Described liquid relief valve
Space between 105 tops and outer sap cavity cavity constitutes outer sap cavity 113；
The lower end of described push rod 103 is fixed on piston 102, is provided with anti-reflux valve in the bottom of push rod 103
114, substantially this anti-reflux valve 114 is an elastic ring being enclosed within push rod 103 bottom；Shown anti-return
Valve 114 forms sealing with slide block 108 lower surface when touching, and prevents the backflow of liquid；Described liquid discharges
Valve 105 is connected with outer sap cavity cavity 109 by liquid relief valve return spring 115；Described cleaning rod 106
Lower end is fixed on liquid relief valve 105, and the other end extends in liquid outlet passage 116.
The upper end of described measuring pump liquid release control device is fixing with compressed air piping 118 to be connected, and institute
The liquid outlet passage 116 stating measuring pump liquid release control device is empty with the compression of compressed air piping 118
Gas passage 119 directly communicates.
The operation principle of above-mentioned measuring pump liquid release control device is as follows:
Liquid flows from the lower to upper part of figure under the driving of piston 25, at top liquid outlet passage 116
Flow out and converge with the compressed air in compressed air channel 118, and carried to nozzle by compressed air and spray into
Motivation blast pipe (nozzles not shown and blast pipe in figure).
Liquid needs to wear during the measurement chamber 111 within measuring pump is discharged into compressed air channel 118
Cross two sap cavities, i.e. interim liquid storage cylinder 112 and the most normally opened outer sap cavity 113, twice valve to be passed through with
One passage, i.e. anti-reflux valve 114, liquid relief valve 105 and liquid outlet passage 116；
Outer sap cavity cavity 109 is fixed on measuring pump cylinder body 101, and outer sap cavity 113 top has liquid outlet to lead to
Road 116 passage 118 empty with compression directly communicates, and maintains a normally open；
Interim liquid storage cylinder 112 can change its volume owing to the slide block 108 bottom it can slide up and down；
Liquid relief valve 105 is had outside between sap cavity 113 and interim liquid storage cylinder 112 the two sap cavity.
Liquid relief valve 105 has liquid relief valve return spring 115 to oppress downwards liquid relief valve 105 to make it
Close；Stretching out cleaning rod 106 above liquid relief valve 105, liquid outlet passage 116 is inserted in its upper end,
Move up and down with liquid relief valve 105；The effect of cleaning rod 106 is exactly at liquid outlet passage 116
And solid urea can be loosened after the urea liquid dehydration crystallization in outer sap cavity 113, it is to avoid liquid outlet leads to
Road 116 is shut by solid urea, and the most also the solid state crystallization in the outer sap cavity 113 of disturbance, helps liquid release
Valve return spring 115 recovers normal function.Liquid relief valve 105 lower surface extends downwardly from liquid relief valve and props up
Support rod 104, this liquid relief valve support stick 104 and the push rod 103 being fixed on piston 102 top below
Same shaft assignment.So when piston 102 moves near top, push rod 103 promotes liquid relief valve support stick
Liquid relief valve 105 is upwards directly backed down (as shown in Figure 3) by 104.
The lower end of described push rod 103 is fixed with piston 102, and the bottom of push rod 103 is cased with one easily
The anti-reflux valve 114 of deformation, moves up and down with push rod 103 and piston 102；When anti-reflux valve 114
Produce when contacting with slide block 108 and seal, the metering sap cavity 111 and formed about on piston 102
And formed between interim liquid storage cylinder 112 and seal, stop liquid to pass.
Specific works mode is described as follows:
Piston 102 by drive coil 122 drive from lower dead center upwards setting in motion time, anti-reflux valve 114 with
Slide block 102 is also in disengaged position, i.e. anti-reflux valve 114 is in opening, the liquid in measurement chamber 111
The slide channel 121 that body is driven through between slide block 108 and push rod 104 by piston 102 flows to interim liquid storage
Chamber 112.Along with piston 102 continues up, anti-reflux valve 114 first contact slipper 108, i.e. anti-return
Valve 114 cuts out, and the liquid in measurement chamber 111 is discharged complete；After anti-reflux valve 114 is closed, push rod 103
Contact liq relief valve 105 liquid below relief valve support stick 104；
Now, piston 102 continues up operation, and anti-reflux valve 114 continues to close, and push rod 103 is by liquid
Relief valve 105 upwards backs down；Meanwhile, slide block 108 upward sliding, can be temporarily in liquid storage cylinder 112
Liquid passage 119 around liquid relief valve support stick 104 clamp-on outer sap cavity 113, then liquid
Compressed air channel 118 is flowed into through liquid outlet passage 116；
Arriving top when piston 102 runs, i.e. touch piston and run stop link stopper 107, piston 102 stops
The most up, the most i.e. move downward；Along with piston 102 moves downward, liquid relief valve 105 is released at liquid
Put also return closedown rapidly under the driving of valve return spring 115；In the process, due to anti-reflux valve 114
Remain closedown, so preventing any liquid or gas to be back to measurement chamber through anti-reflux valve 114
111；
After liquid relief valve 105 is closed, anti-reflux valve 114 starts to depart from and the contacting of slide block 108, and prevents
Return valve 114 is opened；Along with piston 102 continues traveling downwardly, the new liquid that sucks flows into alive from piston 102 lower end
Fill in the measurement chamber 11 of 102 upper ends.When piston 102 runs to lower dead center, and new one week starts；
If piston 102 motion lower dead center and top dead centre are fixed every time, i.e. piston 102 stroke is fixed, then
Piston 102 often moves back and forth one week, and measuring pump just can discharge the liquid of a constant basis volume；Piston 102
Motion can be combined driving by Electromagnetic Drive, Spring driving or electromagnetic spring；Control piston about 102 to transport
Dynamic frequency just can control the dosage of measuring pump releasing liquid in certain unit interval.
Above measuring pump liquid release control device has reached following effect:
1) liquid relief valve 105 directly by piston 102 up time back down, it is possible to use coefficient of elasticity is higher
The liquid relief valve resilience spring 115 of (the most harder) so that liquid relief valve 105 return is fast, closes fast
Speed is in time.Anti-reflux valve 114 remained turned-off within the time of liquid relief valve 105 breakdown, to greatest extent
Avoid because piston 102 reaches in after top dead center measurement chamber 111 pressure by just becoming negative issuable liquid
Measurement chamber 111 is flowed back into gas.Arrangement above makes to be about in measurement chamber 111 on each piston 102
Liquid decreases to greatest extent by compressed air channel 118 during being discharged into compressed air channel 118
The impact of interior pressure change so that this can be in a bigger external air pressure fluctuation range by pump
Keep measuring accuracy.
2) if outer sap cavity 113 and liquid outlet passage 116 urea crystals occur because of dehydration, liquid is sealed
Body exit passageway 116, liquid relief valve 105, stick with paste the liquid relief valve return bullet of liquid relief valve 105
Spring 115, at this time, purely relies on fluid pressure to be hard to turn on liquid relief valve 105.And use work
Fill in 102 up mechanical forces directly to back down and be just easier；The up and down motion adding cleaning rod 106 can
Urea crystals in liquid outlet passage 116 is smash pine, discloses out liquid outlet, liquid can be spilt out.
As long as so liquid is entered outer sap cavity 113 and spilt out by liquid outlet passage 116, urea crystals will
Gradually dissolve so that all recover normal.
3) parking at cold snap when vehicle, during metering air pump inoperative, the internal urea liquid of measuring pump can be also
Can crystallize (i.e. freezing), volume increases expansion, and measuring pump internal hydraulic pressure increases, and orders about slide block 108 and overcomes
The resistance of slide block back-moving spring 110 moves upward so that anti-reflux valve 114 disengaging contacts with slide block 108,
I.e. anti-reflux valve 114 is opened, and liquid is upwards discharged, and reduces measuring pump internal pressure, it is to avoid in measuring pump
Some fine features of portion are damaged.
Comparative example
Fig. 1 shows an example of existing measuring pump, and this figure is shown that a plunger displacement pump, and this pump comprises one
The cylinder body 201 of individual embedding pump core housing 200 inner chamber.Cylinder inner chamber puts a piston 202.Piston 202 is at electromagnetism
At cylinder body 201 under the driving of electromagnetic force produced by coil 203 and piston driving (or reset) spring 204
Inner chamber pump.
When piston 202 moves upward, under the pressure effect of liquid, the built-in check valve of piston 205 is closed,
The liquid feed valve 206 of cylinder base and the liquid relief valve 207 at cylinder body top are opened, and liquid is inhaled into feed liquor
Chamber 208, the liquid in measurement chamber 209 is discharged (release) and goes out measuring pump simultaneously；The liquid discharged
Or taken to nozzle (not shown) by compressed air to spray in the exhaust pipe of engine and (spraying system is helped for gas)
Or in being directly injected into blast pipe by fluid pipeline towards nozzle (helping spraying system without gas).Work as piston
202 reach top backward lower run time, equally under fluid pressure effect, liquid feed valve 206 and liquid release
Valve 207 is closed, and the built-in check valve of piston 205 is opened, and the liquid of admission chamber 208 flows into measurement chamber 209.
If the stroke that piston about 202 runs is fixed, the every reciprocal operation of piston 202 one week, can discharge
The liquid of one fixed volume.So by controlling the reciprocating frequency of piston 202, we just can control
Measuring pump processed discharges the dosage of liquid within a certain unit interval.
Fig. 2 shows another example of existing measuring pump, and this figure shows a membrane pump, under driven by motor,
Camshaft 300 band moving cam 301 rotates, and drives diaphragm 302 to move up and down so that sap cavity 303 inner volume
Change.When diaphragm 302 moves upward, sap cavity 303 produces negative pressure, and liquid feed valve 304 is opened, relief valve 305
Closing, liquid is inhaled into sap cavity 303, film, and 302 when moving downward, and sap cavity 303 produces malleation, liquid feed valve
304 close, and relief valve 305 is opened, and liquid discharges.So, camshaft 300 often rotates one week,
The liquid just having a fixed volume is released out.By controlling the rotating speed of camshaft 300, we just may be used
To control the dosage of measuring pump.
The liquid relief valve of two kinds of pumps described above generally utilizes the internal hydraulic pressure produced of measuring pump to open
And closedown.This has occurred as soon as the various problems described in above-mentioned background technology.Also the prior art having uses
Above-mentioned membrane pump only pressurizes, and adds an Electromagnetic Control metering valve the most again to get around this problem.True
On, the amount of metering valve releasing liquid in the same old way can be by the influence of fluctuations of liquid Yu the pressure differential of outside air.Also
The problems such as other urea crystals are had still to exist.
Obviously, the above embodiment of the present invention is only for clearly demonstrating example of the present invention, and also
Non-is the restriction to embodiments of the present invention.For those of ordinary skill in the field, above-mentioned
Can also make other changes in different forms on the basis of explanation.Here cannot be to all of enforcement
Mode gives exhaustive.Every belong to the obvious change or variation that technical scheme extended out
Row still in protection scope of the present invention.
Claims (6)
1. a measuring pump liquid release control device for the after-treatment system of purifying internal combustion engine tail gas, including
Measuring pump housing (100), measuring pump cylinder body (101) and the piston (102) being arranged in cylinder body；It is special
Levy and be:
Described piston (102) be sequentially arranged above push rod (103), liquid relief valve support stick (104),
Liquid relief valve (105) and cleaning rod (106)；
It is provided with piston in described measuring pump cylinder body (101) and runs stop link stopper (107)；
The cunning of hollow it is provided with in top measuring pump cylinder body (101) of described piston operation stop link stopper (107)
Block (108) and the outer sap cavity cavity (109) of hollow, described outer sap cavity cavity (109) is fixed on measuring pump
Cylinder body (101) internal upper part position；Described outer sap cavity cavity (109) and slide block (108) are by spring (110)
Connect；
Cylinder space between described piston (102) top and slide block (108) constitutes measurement chamber (111)；
Space between described slide block (108) and liquid relief valve (105) bottom constitutes interim liquid storage cylinder (112)；
Space between described liquid relief valve (105) top and outer sap cavity cavity (109) constitutes outer sap cavity (113)；
The lower end of described push rod (103) is fixed on piston (102), sets in the bottom of push rod (103)
Having anti-return circle (114), this anti-return circle (114) is formed close when touching with slide block (108) lower surface
Envelope；Described liquid relief valve (105) is by liquid relief valve return spring (115) and outer sap cavity cavity (109)
Connect；Described cleaning rod (106) lower end is fixed on liquid relief valve (105), and the other end extends to liquid
In body exit passageway (116).
Measuring pump liquid release control device the most according to claim 1, it is characterised in that: described
Outer sap cavity cavity (109) bottom is provided with the fixed block (117) of hollow, and described slide block (108) passes through spring
(110) it is connected with fixed block (117).
Measuring pump liquid release control device the most according to claim 2, it is characterised in that: preferably
Ground, the top of described fixed block (117) is provided with arc-shaped protrusions (122).
4., according to described measuring pump liquid release control device arbitrary in claim 1-3, its feature exists
In: preferably, the upper end of described measuring pump liquid release control device is solid with compressed air piping (118)
Connection, and the liquid outlet passage (116) of described measuring pump liquid release control device calmly and compressed air
The compressed air channel (119) of pipeline (118) directly communicates.
5., according to described measuring pump liquid release control device arbitrary in claim 1-3, its feature exists
In: preferably, described liquid relief valve support stick (104) is pushed up with the piston (102) that is fixed on below
Push rod (103) the same shaft assignment of end.
6., according to described measuring pump liquid release control device arbitrary in claim 1-3, its feature exists
In: preferably, described piston (102) is combined driving by Electromagnetic Drive, Spring driving or electromagnetic spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310052996.6A CN104074735B (en) | 2013-02-18 | 2013-02-18 | The measuring pump liquid release control device of the after-treatment system of purifying internal combustion engine tail gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310052996.6A CN104074735B (en) | 2013-02-18 | 2013-02-18 | The measuring pump liquid release control device of the after-treatment system of purifying internal combustion engine tail gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104074735A CN104074735A (en) | 2014-10-01 |
| CN104074735B true CN104074735B (en) | 2016-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310052996.6A Active CN104074735B (en) | 2013-02-18 | 2013-02-18 | The measuring pump liquid release control device of the after-treatment system of purifying internal combustion engine tail gas |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108180305B (en) * | 2017-12-29 | 2019-12-03 | 胡芳丽 | A kind of flux controllable solenoid valve |
| CN112109937A (en) * | 2020-09-17 | 2020-12-22 | 陈秀爱 | Metering alarm supplement device for glass cement filling machine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2022169C1 (en) * | 1991-05-12 | 1994-10-30 | Центральный научно-исследовательский институт "Буревестник" | Piston-type proportioning pump |
| CN1652880A (en) * | 2002-04-17 | 2005-08-10 | 瓦卢瓦有限合伙公司 | Fluid dispenser pump |
| CN201650642U (en) * | 2009-12-02 | 2010-11-24 | 公安部第一研究所 | Precise plunger metering pump |
| CN202560502U (en) * | 2012-03-26 | 2012-11-28 | 德帕姆(杭州)泵业科技有限公司 | Ceramic-liner piston type metering pump |
-
2013
- 2013-02-18 CN CN201310052996.6A patent/CN104074735B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2022169C1 (en) * | 1991-05-12 | 1994-10-30 | Центральный научно-исследовательский институт "Буревестник" | Piston-type proportioning pump |
| CN1652880A (en) * | 2002-04-17 | 2005-08-10 | 瓦卢瓦有限合伙公司 | Fluid dispenser pump |
| CN201650642U (en) * | 2009-12-02 | 2010-11-24 | 公安部第一研究所 | Precise plunger metering pump |
| CN202560502U (en) * | 2012-03-26 | 2012-11-28 | 德帕姆(杭州)泵业科技有限公司 | Ceramic-liner piston type metering pump |
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| CN104074735A (en) | 2014-10-01 |
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