CN104074735A - Metering pump liquid release control device of post-processing system for internal combustion engine tail gas purification - Google Patents
Metering pump liquid release control device of post-processing system for internal combustion engine tail gas purification Download PDFInfo
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- CN104074735A CN104074735A CN201310052996.6A CN201310052996A CN104074735A CN 104074735 A CN104074735 A CN 104074735A CN 201310052996 A CN201310052996 A CN 201310052996A CN 104074735 A CN104074735 A CN 104074735A
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Abstract
A metering pump liquid release control device of a post-processing system for internal combustion engine tail gas purification comprises a metering pump shell, a metering pump cylinder body and a piston arranged in the cylinder body, and a pushing stick, a liquid release valve supporting stick, a liquid release valve and a cleaning stick are sequentially arranged above the piston. A piston operation stop point baffle block is arranged in the metering pump cylinder body; a hollow sliding block and a hollow outer liquid cavity body are arranged at the position, above the piston operation stop point baffle block, in the metering pump cylinder body; a metering cavity is formed by a cylinder body space between the upper portion of the piston and the sliding block, and a temporary liquid storage cavity is formed by a space between the sliding block and the lower portion of the liquid release valve. According to the device, the influences of external spray-assisted air pressure can be greatly reduced, and the metering precision of the metering pump can be kept within the large spray-assisted air pressure range. Meanwhile, due to the design of double liquid-outlet cavities and action of the pushing stick and the cleaning stick, the metering pump is not damaged by urea crystallization, or, the normal work of the metering pump is not affected by the urea crystallization, and the practicability of the metering pump is greatly improved.
Description
Technical field
The present invention relates to a kind of metering pump liquid release control device, especially relate to a kind of metering pump liquid release control device of after-treatment system of purifying internal combustion engine tail gas.
Background technique
At present for the urea-spray system of diesel engine reprocessing, take gas auxiliary system as main flow, the especially application on medium-weight vehicle.It is source of the gas that gas helps urea-spray system to adopt brake compression air on vehicle.Common way is that pressurized air (helping spray air) is caused to urea metering pump, and the urea liquid that metering pump is discharged is carried into nozzle, finally sprays into engine exhaust pipe.This arrangement often can make the metering of metering pump be subject to helping interference and the impact of spray air pressure; Its main cause be because the pressure in the metering pump relief valve external world (helping the pressure of spray air) variable effect the open and close of liquid relief valve of metering pump control.Specifically, be relief valve open amount, open the aspects such as endurance, shut-in time and sealing and can not reach designing requirement.Existing technology can not guarantee that metering pump relief valve has enough constant open amounts and opens the endurance, especially in the different external worlds, help the open amount of relief valve under spray air pressure and unlatching endurance can not keep constant, cause metering to be seriously subject to the external world to help spray pressure influence.In addition, metering pump relief valve fluid pressure drop to help spray air pressure before throttle down in time, allow air or the liquid that discharged flows backwards that into metering pump, to measure sap cavity be also the common problem that affects metering pump precision.In fact, maintain that metering pump precision can bear to help spray air pressure scope (window) size be one of most important index of this metering pump.
In addition, the metering pump of prior art also has following Frequently Asked Questions:
1) unlatching of liquid relief valve is purely squeezed and is opened by liquid, often can encounter the contradiction of hydraulic driving power and valve reseting spring elastic force.In general, if need liquid relief valve to close in time, just need Returnning spring to have higher elasticity coefficient, i.e. harder spring.But strong Returnning spring makes valve need powerful strength to carry out breakdown.A pair of very outstanding contradiction that Here it is.
2) place contacting with ambient air at liquid, such as liquid outlet, often because moisture evaporation causes urea liquid dehydration crystallization.Especially at vehicle, park for a long time after not using all the more so.If this occurs, the liquid outlet passage of whole metering pump and even liquid relief valve and Returnning spring etc. all can be shut by solid urea.At this moment, rely on the fluid pressure of pump inside cannot open relief valve completely, also liquid outlet passage cannot be opened.
3), at cold weather, urea liquid can freeze, volumetric expansion.If the leeway of volumetric expansion is not allowed in metering pump inside, some meticulousr parts will be damaged so.Vehicle just cannot be parked at arctic weather like this.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of metering pump liquid release control device of after-treatment system of purifying internal combustion engine tail gas.This device adopts the double valve design of biliquid chamber, one of them cavity volume is variable, adopt push rod directly to push liquid relief valve open simultaneously, adopt the liquid outlet of the loosening possibility of cleaning rod crystallization, solved the contradiction between liquid relief valve opens and closes, make metering pump to keep good accuracy in the larger spray air pressure scope that helps, and solved the series of problems that urea liquid crystallization brings.
For solving the problems of the technologies described above, the present invention adopts following technological scheme:
A metering pump liquid release control device for the after-treatment system of purifying internal combustion engine tail gas, comprises metering pump housing, metering pump cylinder body and is arranged on the piston in cylinder body;
Described piston top sets gradually push rod, liquid relief valve support stick, liquid relief valve and cleaning rod;
In described metering pump cylinder body, be provided with piston operation stop link stopper, for limiting the stroke of piston, when piston operation arrives top, touch piston operation stop link stopper, piston stops up, moves downward subsequently;
In the top metering pump cylinder body of described piston operation stop link stopper, be provided with the slide block of hollow and the outer sap cavity cavity of hollow, described outer sap cavity cavity is fixed on metering pump cylinder body internal upper part position; Described outer sap cavity cavity is connected by spring with slide block;
Cylinder space between described piston top and slide block forms measuring cavity; Space between described slide block and liquid relief valve bottom forms interim liquid storage cylinder; Space between described liquid relief valve top and outer sap cavity cavity forms outer sap cavity;
The lower end of described push rod is fixed on piston, in the bottom of push rod, is provided with anti-backflow circle, and this anti-backflow circle forms sealing when touching with slide block lower end surface, prevents the backflow of liquid; Described liquid relief valve is connected with outer sap cavity cavity by liquid relief valve return spring; Described cleaning rod lower end is fixed on liquid relief valve, and the other 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 is connected with fixed block by spring.
Preferably, the top of described fixed block is provided with arc-shaped protrusions; Conveniently with between liquid relief valve lower end surface when contacting, form sealing;
Preferably, the upper end of described metering pump liquid release control device is fixedly connected with compressed air line, and the liquid outlet passage of described metering pump liquid release control device directly communicates with the compressed air channel of compressed air line.
Preferably, described liquid relief valve support stick with its below the coaxial centering of the push rod that is fixed on piston tip.
Preferably, described piston is combined driving by Electromagnetic Drive, Spring driving or electromagnetic spring.
The present invention has following beneficial effect:
1) the present invention has adopted two go out sap cavity and the designs of biliquid relief valve.In the inner measuring cavity of metering pump, fluid pressure is when just pressing to negative pressure conversion, remains that of two valves discharging for liquid closes, and avoided to greatest extent the liquid that discharged or the extraneous air metering pump measuring cavity that flows backwards back.
2) two sap cavities for releasing liquid have a volume to change, and when urea liquid crystalline volume increases, for leaving volumetric expansion space in metering pump inside, protection metering pump inner member is not damaged.
3) the present invention adopts and utilizes machinery or electromagnetic force directly to back down liquid relief valve by a push rod, has greatly reduced it and has opened the needed power of liquid relief valve, the defect of also having avoided possible urea crystals that this valve cannot be opened.
4) at liquid outlet, cleaning rod is installed and is moved with liquid release spool, can become flexible the urea crystals that may exist, avoid outlet to be shut by solid urea.
In sum, metering pump liquid release control device of the present invention can greatly reduce the impact that the external world helps spray air pressure, can keep metering pump measuring accuracy in larger helping within the scope of spray air pressure.Simultaneously due to two, go out the design of sap cavity and the effect of push rod and cleaning rod makes metering pump not because urea crystals is damaged or affect normal work, greatly increased the practicability of metering pump.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail
Fig. 1 is the structural representation of existing a kind of metering pump;
Fig. 2 is the structural representation of existing another kind of metering pump;
Fig. 3 is a kind of structural representation of the present invention.
Embodiment
Embodiment 1
The word in the description orientation that hereinafter adopted " on ", D score, " left side ", " right side " etc. are all convenience in order to illustrate based on the orientation shown in drawing in accompanying drawing, in actual device, these orientation may be different due to the disposing way of device.
Shown in Figure 3, a kind of metering pump liquid release control device of after-treatment system of purifying internal combustion engine tail gas, comprises metering pump housing 100, metering pump cylinder body 101 and is arranged on the piston 102 in cylinder body;
Described piston 102 tops set gradually push rod 103, liquid relief valve support stick 104, liquid relief valve 105 and cleaning rod 106; Described liquid relief valve support stick 104 with its below the coaxial centering of push rod 103 that is fixed on piston 102 tops, be also the two central axes;
In described metering pump cylinder body 101, be provided with piston operation stop link stopper 107, for limiting the stroke of piston 102, when piston 102 operations arrive top, touch piston operation stop link stopper 107, piston 102 stops up, moves downward subsequently;
In the top metering pump cylinder body 101 of described piston operation stop link stopper 107, be provided with the slide block 108 of hollow and the outer sap cavity cavity 109 of hollow, described outer sap cavity cavity 109 is fixed on metering pump cylinder body 101 internal upper part positions; Described outer sap cavity cavity 109 is connected by spring 110 with slide block 108; In particular, described outer sap cavity cavity 109 bottoms are provided with the fixed block 117 of hollow, and described spring 110 one end are fixedly connected on slide block 108, and the other end is fixedly connected on fixed block 117; The top of described fixed block 117 is provided with arc-shaped protrusions 122; Conveniently with between liquid relief valve 105 lower end surfaces when contacting, form sealing;
Cylinder space between described piston 102 tops and slide block 108 forms measuring cavity 111; Space between described slide block 108 and liquid relief valve 105 bottoms forms interim liquid storage cylinder 112; Space between described liquid relief valve 105 tops and outer sap cavity cavity forms outer sap cavity 113;
The lower end of described push rod 103 is fixed on piston 102, in the bottom of push rod 103, is provided with anti-reflux valve 114, and this anti-reflux valve 114 is elastic rings that are enclosed within push rod 103 bottoms in fact; Shown in anti-reflux valve 114 when touching with slide block 108 lower end surfaces, form sealing, prevent the backflow of liquid; Described liquid relief valve 105 is connected with outer sap cavity cavity 109 by liquid relief valve return spring 115; Described cleaning rod 106 lower ends are fixed on liquid relief valve 105, and the other end extends in liquid outlet passage 116.
The upper end of described metering pump liquid release control device is fixedly connected with compressed air line 118, and the liquid outlet passage 116 of described metering pump liquid release control device and the compressed air channel 119 of compressed air line 118 directly communicate.
The working principle of above-mentioned metering pump liquid release control device is as follows:
Flow to top in liquid bottom from figure under the driving of piston 25, top liquid outlet passage 116 flow out with compressed air channel 118 in pressurized air converge, and compressed air is carried into nozzle and sprays into engine exhaust pipe (not showing nozzle and outlet pipe in figure).
Liquid needs through two sap cavities from the measuring cavity 111 of metering pump inside is discharged into the process of compressed air channel 118, be interim liquid storage cylinder 112 and the external outer sap cavity 113 of often opening, also to pass through twice valve and a passage, i.e. anti-reflux valve 114, liquid relief valve 105 and liquid outlet passage 116;
Outer sap cavity cavity 109 is fixed on metering pump cylinder body 101, and outer sap cavity 113 tops have liquid outlet passage 116 directly to communicate with the empty passage 118 of compression, keep often opening;
Interim liquid storage cylinder 112 is because the slide block 108 of its bottom can slide up and down and can change its volume;
Between sap cavity 113 and interim liquid storage cylinder 112 these two sap cavities, there is liquid relief valve 105 outside.
Liquid relief valve 105 has liquid relief valve return spring 115 to lower compression liquid relief valve 105, it to be closed; Liquid relief valve 105 stretches out cleaning rod 106 above, and liquid outlet passage 116 is inserted in its upper end, with liquid relief valve 105, moves up and down; The effect of cleaning rod 106 is exactly can solid urea is loosening after the urea liquid dehydration crystallization in liquid outlet passage 116 and outer sap cavity 113, avoid liquid outlet passage 116 to be shut by solid urea, simultaneously the also solid state crystallization in the outer sap cavity 113 of disturbance, helps liquid relief valve return spring 115 to recover normal functions.Liquid relief valve 105 lower end surface downward flashed liquid relief valve support sticks 104, this liquid relief valve support stick 104 with its below the coaxial centering of push rod 103 that is fixed on piston 102 tops.When the piston 102 close top of motion, push rod 103 promotes liquid relief valve support sticks 104 and upwards liquid relief valve 105 is directly backed down to (as shown in Figure 3) like this.
The lower end of described push rod 103 and piston 102 is fixing, and the bottom of push rod 103 cover has one to hold yielding anti-reflux valve 114, with push rod 103 and piston 102, moves up and down; When anti-reflux valve 114 contacts with slide block 108, produce sealing, on piston 102 and around between formed metering sap cavity 111 and interim liquid storage cylinder 112, form and seal, prevention liquid passes.
Specific works mode is described below:
When piston 102 makes progress setting in motion by drive coil 122 drivings from lower dead center, anti-reflux valve 114 and slide block 102 are also in disengaged position, be anti-reflux valve 114 in opening state, the liquid in measuring cavity 111 is driven and flows to interim liquid storage cylinder 112 by the slide block passage 121 between slide block 108 and push rod 104 by piston 102.Along with piston 102 continuation are up, anti-reflux valve 114 is contact slipper 108 first, and anti-reflux valve 114 is closed, and the liquid in measuring cavity 111 is discharged complete; After anti-reflux valve 114 is closed, push rod 103 contact liq relief valves 105 liquid relief valve support stick 104 below;
Now, piston 102 continues upwards operation, and anti-reflux valve 114 continues to close, and push rod 103 upwards backs down liquid relief valve 105; Meanwhile, slide block 108 upward slidings, the liquid in liquid storage cylinder 112 is clamp-oned outer sap cavity 113 through liquid relief valve support stick 104 passage 119 around temporarily, and then liquid flows into compressed air channel 118 through liquid outlet passage 116;
When piston 102 operations arrive top, touch piston operation stop link stopper 107, piston 102 stops up, moves downward subsequently; Along with piston 102 moves downward, liquid relief valve 105 under the driving of liquid relief valve return spring 115 also rapidly return close; In this process, because remaining, anti-reflux valve 114 closes, so prevented that any liquid or gas are back to measuring cavity 111 through anti-reflux valve 114;
After liquid relief valve 105 is closed, anti-reflux valve 114 starts to depart from and the contacting of slide block 108, and anti-reflux valve 114 is opened; Along with piston 102 continuation are descending, newly suck liquid and from piston 102 lower ends, flow into the measuring cavity 11 of piston 102 upper ends.When piston 102 moves to lower dead center, new one week starts;
If each piston 102 motion lower dead center and top dead center are fixed, piston 102 strokes are fixed, and the every to-and-fro motion of piston 102 is one week so, and metering pump just can be discharged the liquid of a constant basis volume; The motion of piston 102 can be combined driving by Electromagnetic Drive, Spring driving or electromagnetic spring; The frequency that control piston 102 moves up and down just can be controlled the dosage of metering pump releasing liquid in certain unit time.
Above metering pump liquid release control device has reached following effect:
1) when liquid relief valve 105 is directly up by piston 102, back down, can use the liquid relief valve resilience spring 115 of elasticity coefficient higher (harder), make liquid relief valve 105 returns fast, close rapidly in time.Anti-reflux valve 114 keeps closing within the time of liquid relief valve 105 breakdowns, has avoided to greatest extent refluxing into measuring cavity 111 by just becoming negative issuable liquids and gases because piston 102 reaches atdc measuring cavity 111 internal pressures.The liquid that is more than arranged to be about on each piston 102 in measuring cavity 111 is discharged in the process of compressed air channel 118 and has reduced to greatest extent and be compressed the impact that air passageways 118 internal pressures change, and makes this that pump can be kept to measuring accuracy in a larger external air pressure wave range.
2) if there is urea crystals because of dehydration in outer sap cavity 113 and liquid outlet passage 116, seal liquid outlet passage 116, liquid relief valve 105, stick with paste the liquid relief valve return spring 115 of liquid relief valve 105, at this time, purely rely on fluid pressure to be difficult to open liquid relief valve 105.And adopt the up mechanical force of piston 102 directly to back down just than being easier to; Add moving up and down of cleaning rod 106 and the urea crystals in liquid outlet passage 116 can be smash to pine, disclose out liquid outlet, liquid can be spilt out.As long as liquid enters outer sap cavity 113 and spills out by liquid outlet passage 116, urea crystals will be dissolved gradually like this, makes all recover normal.
3) when vehicle is parked at cold snap, during metering air pump inoperative, the inner urea liquid of metering pump can be also can crystallization (freezing), volume increases and expands, metering pump internal hydraulic pressure increases, ordering about the resistance that slide block 108 overcomes slide block Returnning spring 110 moves upward, anti-reflux valve 114 is departed from and the contacting of slide block 108, and anti-reflux valve 114 is opened, and liquid is discharge upwards, reduce metering pump internal pressure, avoid the more inner meticulous parts of metering pump to be damaged.
Comparative example
Fig. 1 shows an example of existing metering pump, and what this figure showed is a plunger pump, the cylinder body 201 that this pump comprises embedding pump core housing 200 inner chambers.Cylinder inner chamber is put a piston 202.Inner chamber at cylinder body 201 under the driving of the electromagnetic force that piston 202 produces at electromagnetic coil 203 and piston actuated (or reset) spring 204 pumps.
When piston 202 moves upward, under the pressure-acting of liquid, the built-in one-way valve 205 of piston is closed, and the liquid feed valve 206 of cylinder base and the liquid relief valve 207 at cylinder body top are opened, liquid is inhaled into admission chamber 208, and the liquid in while measuring cavity 209 is discharged from (release) and goes out metering pump; The liquid discharging or compressed air take nozzle (not shown) to and spray in engine exhaust pipe (for gas, helping ejecting system) or directly by fluid pipeline, lead to nozzle and be injected in outlet pipe and (without gas, help ejecting system).When piston 202 reaches the backward lower operation in top, under fluid pressure effect, liquid feed valve 206 and liquid relief valve 207 are closed equally, and the built-in one-way valve 205 of piston is opened, and the liquid of admission chamber 208 flows into measuring cavity 209.If the stroke that piston 202 moves is up and down fixed, piston 202 is every back and forth moves one week, can discharge the liquid of a fixed volume.By the reciprocating frequency of control piston 202, we just can control metering pump and within a certain unit time, discharge the dosage of liquid like this.
Fig. 2 shows another example of existing metering pump, and this figure shows a diaphragm pump, and under driven by motor, camshaft 300 band moving cams 301 rotate, and drive diaphragm 302 to move up and down, and sap cavity 303 inner volumes are changed.When diaphragm 302 moves upward, sap cavity 303 produces negative pressure, and liquid feed valve 304 is opened, and relief valve 305 is closed, and liquid is inhaled into sap cavity 303, film, and 302 when move downward, and sap cavity 303 produces malleations, and liquid feed valve 304 is closed, and relief valve 305 is opened, and liquid discharges.Like this, the every rotation of camshaft 300 one week, just has the liquid of a fixed volume to be released out.By controlling the rotating speed of camshaft 300, we just can control the dosage of metering pump.
The liquid relief valve of above-described two kinds of pumps utilizes the inner hydraulic pressure producing of metering pump to carry out opening and closing conventionally.Just there is the variety of issue described in above-mentioned background technology in this.Also the prior art having adopts above-mentioned diaphragm pump only to pressurize, and gets around this problem adding an Electromagnetic Control metering valve thereafter again.In fact, the amount of metering valve releasing liquid can be subject to the influence of fluctuations of the pressure difference of liquid and ambient air in the same old way.Also have the problems such as other urea crystals still to exist.
Obviously, the above embodiment of the present invention is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here cannot give all mode of executions exhaustive.Every still row in protection scope of the present invention of apparent variation that technological scheme of the present invention extends out or change that belong to.
Claims (6)
1. a metering pump liquid release control device for the after-treatment system of purifying internal combustion engine tail gas, comprises metering pump housing (100), metering pump cylinder body (101) and is arranged on the piston (102) in cylinder body; It is characterized in that:
Described piston (102) top sets gradually push rod (103), liquid relief valve support stick (104), liquid relief valve (105) and cleaning rod (106);
In described metering pump cylinder body (101), be provided with piston operation stop link stopper (107);
In the top metering pump cylinder body (101) of described piston operation stop link stopper (107), be provided with the slide block (108) of hollow and the outer sap cavity cavity (109) of hollow, described outer sap cavity cavity (109) is fixed on metering pump cylinder body (101) internal upper part position; Described outer sap cavity cavity (109) is connected by spring (110) with slide block (108);
Cylinder space between described piston (102) top and slide block (108) forms measuring cavity (111); Space between described slide block (108) and liquid relief valve (105) bottom forms interim liquid storage cylinder (112); Space between described liquid relief valve (105) top and outer sap cavity cavity (109) forms outer sap cavity (113);
It is upper that the lower end of described push rod (103) is fixed on piston (102), in the bottom of push rod (103), is provided with anti-backflow circle (114), and this anti-backflow circle (114) forms sealing when touching with slide block (108) lower end surface; Described liquid relief valve (105) is connected with outer sap cavity cavity (109) by liquid relief valve return spring (115); It is upper that described cleaning rod (106) lower end is fixed on liquid relief valve (105), and the other end extends in liquid outlet passage (116).
2. metering pump liquid release control device according to claim 1, is characterized in that: described outer sap cavity cavity (109) bottom is provided with the fixed block (117) of hollow, and described slide block (108) is connected with fixed block (117) by spring (110).
3. metering pump liquid release control device according to claim 2, is characterized in that: preferably, the top of described fixed block (117) is provided with arc-shaped protrusions (122).
4. according to arbitrary described metering pump liquid release control device in claim 1-3, it is characterized in that: preferably, the upper end of described metering pump liquid release control device is fixedly connected with compressed air line (118), and the liquid outlet passage (116) of described metering pump liquid release control device and the compressed air channel (119) of compressed air line (118) directly communicate.
5. according to arbitrary described metering pump liquid release control device in claim 1-3, it is characterized in that: preferably, described liquid relief valve support stick (104) with its below the coaxial centering of push rod (103) that is fixed on piston (102) top.
6. according to arbitrary described metering pump liquid release control device in claim 1-3, it is characterized in that: preferably, described piston (102) is combined driving by Electromagnetic Drive, Spring driving or electromagnetic spring.
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| 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 |
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| 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 |
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| Publication Number | Publication Date |
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| CN104074735A true CN104074735A (en) | 2014-10-01 |
| CN104074735B CN104074735B (en) | 2016-08-24 |
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| 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108180305A (en) * | 2017-12-29 | 2018-06-19 | 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 |
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| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108180305A (en) * | 2017-12-29 | 2018-06-19 | 胡芳丽 | A kind of flux controllable solenoid valve |
| 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 |
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| Publication number | Publication date |
|---|---|
| CN104074735B (en) | 2016-08-24 |
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