CN106285851A - A kind of dosing pump fluid path blow device - Google Patents
A kind of dosing pump fluid path blow device Download PDFInfo
- Publication number
- CN106285851A CN106285851A CN201610843352.2A CN201610843352A CN106285851A CN 106285851 A CN106285851 A CN 106285851A CN 201610843352 A CN201610843352 A CN 201610843352A CN 106285851 A CN106285851 A CN 106285851A
- Authority
- CN
- China
- Prior art keywords
- dosing pump
- spool
- valve seat
- spring
- fluid path
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2093—Periodically blowing a gas through the converter, e.g. in a direction opposite to exhaust gas flow or by reversing exhaust gas flow direction
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
Abstract
The invention discloses a kind of dosing pump fluid path blow device, it includes valve seat, the gentle joint of spool, described valve seat is installed on the dosing pump pump housing, it is provided with hydraulic cavities in the described dosing pump pump housing, the centre bore for installing spool is offered in described valve seat, described centre bore is connected with described hydraulic cavities, the middle part of described centre bore is provided with stage portion, the top of described stage portion is provided with spring, the top of described spring is provided with spring base, the bottom of described spool is resisted against the bottom surface of described stage portion, and spring compression is arranged in centre bore by the top of described spool by limit assembly, the outer end of described valve seat connects gas joint, described gas joint connects high-pressure air source.Above-mentioned dosing pump fluid path blow device is not only simple in structure, it is easy to accomplish；And work as dosing pump at low ambient temperatures, when not working, it is to avoid cause other damage of components because carbamide freezes, it is ensured that the normal table work of dosing pump.
Description
Technical field
The present invention relates to a kind of dosing pump, especially relate to a kind of metering for selective catalytic conversion system of diesel engine
Pump fluid path blow device.
Background technology
Refer to be arranged on for selective catalytic conversion system of diesel engine SCR (SelectiveCatalystReduction)
In diesel engine automobile air exhausting system, the NOx in diesel emission is catalysed and reduced into N2And O2Catalytic reduction device, select carbamide
Aqueous solution is as reducing agent.Aqueous solution of urea is ejected in the exhaustor of catalyst upstream, in EGT and the effect of air-flow
Lower hydrolysis is produced as CO2And ammonia, NOx is reduced into free of contamination nitrogen and water as reducing agent by ammonia.
Dosing pump is requisite vitals in SCR system, at present, the existing dosing pump for SCR system, work
Make temperature at-40 DEG C～85 DEG C.But in concrete application process, often occur that part dosing pump is (low at low temperature environment
In-11 DEG C) work time, urea liquid supply pump there will be fault, reason be due in pump hydraulic cavities carbamide freeze, volumetric expansion
(expansion rate about 9%), makes the electronic devices and components within dosing pump, measuring instruments damage, serious meeting cause the dosing pump pump housing with
And the spalling of pipeline, cause dosing pump to break down.
The problems referred to above have a strong impact on the stability of dosing pump.Become the problem that those skilled in the art are anxious to be resolved.
Summary of the invention
It is an object of the invention to provide a kind of dosing pump fluid path blow device, exist solving dosing pump in prior art
The problem causing other damage of components because of carbamide icing under low temperature environment.
For reaching this purpose, the present invention by the following technical solutions:
A kind of dosing pump fluid path blow device, it includes the gentle joint of valve seat, spool, and wherein, described valve seat is installed on
On the dosing pump pump housing, in the described dosing pump pump housing, it is provided with hydraulic cavities, in described valve seat, offers the center for installing spool
Hole, described centre bore is connected with described hydraulic cavities, and the middle part of described centre bore is provided with stage portion, the top of described stage portion
Being provided with the spring being placed on outside spool, the top of described spring is provided with the spring base being placed on outside spool, the bottom of described spool
It is resisted against the bottom surface of described stage portion, and spring compression is arranged in centre bore by limit assembly by the top of described spool,
The outer end of described valve seat connects gas joint, and described gas joint connects high-pressure air source.
Especially, described limit assembly includes the draw-in groove offering described spool top, is provided with spring in described draw-in groove
Collar.
Especially, the bottom surface of described stage portion is up-small and down-big pyramidal structure, and the bottom of corresponding described spool is taper
Head, described conical head is provided with sealing ring.
Especially, described valve seat is fixed on the described dosing pump pump housing by several fixing screws, and described valve seat with
It is provided with sealing ring between the described dosing pump pump housing.
Especially, on the sidewall of described seat bottom portion, symmetry offers two passages.
Beneficial effects of the present invention is, the letter of the most described dosing pump fluid path blow device not only structure
It is single, it is easy to accomplish；And dosing pump is normally working when, described gas joint stuffiness, the pretightning force of described spring makes institute
State spool to be not switched on, keep dosing pump hydraulic cavities to seal, therefore on the dosing pump performance it described without impact；When the knot that normally works
Bundle, dosing pump enters purge stages, and described gas joint is ventilated, and air pressure is more than described initial tension of spring, and described spool is opened, air-flow
Enter hydraulic cavities, carbamide in hydraulic cavities is blown away from loop, when preventing low temperature (＜-11 DEG C), liquid freezing and expansion, damages the pump housing
Parts.Ensure the normal table work of dosing pump.
Accompanying drawing explanation
Fig. 1 is the explosive view of the dosing pump fluid path blow device that the specific embodiment of the invention 1 provides；
Fig. 2 is the profile after the assembling of the dosing pump fluid path blow device that the specific embodiment of the invention 1 provides；
Fig. 3 is the stereochemical structure after the assembling of the dosing pump fluid path blow device that the specific embodiment of the invention 1 provides
Schematic diagram.
Detailed description of the invention
Further illustrate technical scheme below in conjunction with the accompanying drawings and by detailed description of the invention.
Referring to shown in Fig. 1 to Fig. 3, in the present embodiment, a kind of dosing pump fluid path blow device includes valve seat 1, spool 2
Gentle joint 3, described valve seat 1 is fixed on the described dosing pump pump housing 5 by several fixing screws 4, and described valve seat 1 and institute
State and between the dosing pump pump housing 5, be provided with the first sealing ring 6, be provided with hydraulic cavities 7 in the described dosing pump pump housing 5, in described valve seat 1
Offering the centre bore 8 for installing spool 2, described centre bore 8 is connected with described hydraulic cavities 7, the middle part of described centre bore 8
Being provided with stage portion 9, the top of described stage portion 9 is provided with the spring 10 being placed on outside spool 2, and the top of described spring 10 is arranged
Having the spring base 11 being placed on outside spool 2, the bottom surface of described stage portion 9 is up-small and down-big pyramidal structure, corresponding described spool 2
Bottom is conical head 12, and described conical head 12 is provided with the second sealing ring 13, and described conical head 12 is resisted against described stage portion 9
Bottom surface.
Spring 10 compression is arranged in centre bore 8 by the top of described spool 2 by limit assembly, described limit assembly bag
Include the draw-in groove 14 offering described spool 2 top, in described draw-in groove 14, be provided with spring collar 15.The outer end of described valve seat 1 is even
Connecing gas joint 3, described gas joint 3 connects high-pressure air source.
On sidewall bottom described valve seat 1, symmetry offers two passages 16.
First being contained in valve seat 1 by spool 2, then spring 10 is enclosed within spool 2, and spring base 11 is pressed on spring 10, makes bullet
Spring 10 produces certain pretightning force, and spring collar 15 is press-fitted on spring base 11, relies on the draw-in groove 14 card fastening of spool 2 upper end
Fixed, gas joint 3 is arranged on valve seat 1, finally will be integrally attached on the dosing pump pump housing 5 with fixing screw 4.
Dosing pump normally works when, the stuffiness of described gas joint 3, the pretightning force of described spring 10 makes described spool
2 are not switched on, and keep dosing pump hydraulic cavities to seal, therefore on the dosing pump performance it described without impact；When normal end-of-job, metering
Pump enters purge stages, and described gas joint 3 is ventilated, and air pressure is more than described spring 10 pretightning force, and described spool 2 is opened, and air-flow enters
Enter hydraulic cavities 7, carbamide in hydraulic cavities 7 is blown away from loop, when preventing low temperature (＜-11 DEG C), liquid freezing and expansion, damages metering
Pump parts.
Above example simply elaborates ultimate principle and the characteristic of the present invention, and the present invention is not limited by above-mentioned example,
Without departing from the spirit and scope, the present invention also has various change and change, and these changes and change both fall within
In scope of the claimed invention.Claimed scope is defined by appending claims and equivalent thereof.
Claims (5)
1. a dosing pump fluid path blow device, it includes the gentle joint of valve seat, spool, it is characterised in that described valve seat is pacified
It is loaded on the dosing pump pump housing, is provided with hydraulic cavities in the described dosing pump pump housing, offers for installing spool in described valve seat
Centre bore, described centre bore is connected with described hydraulic cavities, and the middle part of described centre bore is provided with stage portion, described stage portion
Top is provided with the spring being placed on outside spool, and the top of described spring is provided with the spring base being placed on outside spool, described spool
Bottom is resisted against the bottom surface of described stage portion, and spring compression is arranged at centre bore by limit assembly by the top of described spool
In, the outer end of described valve seat connects gas joint, and described gas joint connects high-pressure air source.
Dosing pump fluid path blow device the most according to claim 1, it is characterised in that described limit assembly includes offering
There is the draw-in groove at described spool top, in described draw-in groove, be provided with spring collar.
Dosing pump fluid path blow device the most according to claim 1 and 2, it is characterised in that the bottom surface of described stage portion
For up-small and down-big pyramidal structure, the bottom of corresponding described spool is conical head, and described conical head is provided with sealing ring.
Dosing pump fluid path blow device the most according to claim 1, it is characterised in that described valve seat is solid by several
Determine screw to be fixed on the described dosing pump pump housing, and be provided with sealing ring between described valve seat and the described dosing pump pump housing.
Dosing pump fluid path blow device the most according to claim 1, it is characterised in that on the sidewall of described seat bottom portion
Symmetry offers two passages.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610843352.2A CN106285851A (en) | 2016-09-22 | 2016-09-22 | A kind of dosing pump fluid path blow device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610843352.2A CN106285851A (en) | 2016-09-22 | 2016-09-22 | A kind of dosing pump fluid path blow device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106285851A true CN106285851A (en) | 2017-01-04 |
Family
ID=57712850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610843352.2A Pending CN106285851A (en) | 2016-09-22 | 2016-09-22 | A kind of dosing pump fluid path blow device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106285851A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109252923A (en) * | 2018-09-18 | 2019-01-22 | 潍柴动力股份有限公司 | Gas helps formula urea injection system and its lower electric blowing method |
| CN113775393A (en) * | 2021-09-18 | 2021-12-10 | 一汽解放汽车有限公司 | Back-flushing three-way structure, urea injection system, back-flushing emptying method and vehicle |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050252201A1 (en) * | 2004-05-17 | 2005-11-17 | Lecea Oscar A | Method and apparatus for reducing NOx emissions |
| CN102588052A (en) * | 2012-03-08 | 2012-07-18 | 湖北天雄科技有限公司 | SCR (selective catalyst reduction) jetting system |
| CN102979604A (en) * | 2012-11-28 | 2013-03-20 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Reducing agent spraying and metering device |
| CN103147828A (en) * | 2013-03-26 | 2013-06-12 | 无锡市凯龙汽车设备制造有限公司 | Gas-liquid one-way mixing device for urea pump |
| CN203891980U (en) * | 2014-04-29 | 2014-10-22 | 中国重汽集团济南动力有限公司 | Air-assisted urea supply device for diesel engine |
| CN104350251A (en) * | 2012-05-29 | 2015-02-11 | 罗伯特·博世有限公司 | Injection system, metering pump, exhaust gas treatment device, method |
| CN104819039A (en) * | 2015-04-27 | 2015-08-05 | 东莞正扬电子机械有限公司 | Urea pump and urea system containing same |
| CN204609994U (en) * | 2015-05-14 | 2015-09-02 | 中国重汽集团济南动力有限公司 | A kind of air-assisted SCR urea injection system |
| KR101655201B1 (en) * | 2015-03-09 | 2016-09-07 | 현대자동차 주식회사 | Urea solution pump unit |
| CN206111295U (en) * | 2016-09-22 | 2017-04-19 | 凯龙高科技股份有限公司 | Liquid way sweeps device for measuring pump |
-
2016
- 2016-09-22 CN CN201610843352.2A patent/CN106285851A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050252201A1 (en) * | 2004-05-17 | 2005-11-17 | Lecea Oscar A | Method and apparatus for reducing NOx emissions |
| CN102588052A (en) * | 2012-03-08 | 2012-07-18 | 湖北天雄科技有限公司 | SCR (selective catalyst reduction) jetting system |
| CN104350251A (en) * | 2012-05-29 | 2015-02-11 | 罗伯特·博世有限公司 | Injection system, metering pump, exhaust gas treatment device, method |
| CN102979604A (en) * | 2012-11-28 | 2013-03-20 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Reducing agent spraying and metering device |
| CN103147828A (en) * | 2013-03-26 | 2013-06-12 | 无锡市凯龙汽车设备制造有限公司 | Gas-liquid one-way mixing device for urea pump |
| CN203891980U (en) * | 2014-04-29 | 2014-10-22 | 中国重汽集团济南动力有限公司 | Air-assisted urea supply device for diesel engine |
| KR101655201B1 (en) * | 2015-03-09 | 2016-09-07 | 현대자동차 주식회사 | Urea solution pump unit |
| CN104819039A (en) * | 2015-04-27 | 2015-08-05 | 东莞正扬电子机械有限公司 | Urea pump and urea system containing same |
| CN204609994U (en) * | 2015-05-14 | 2015-09-02 | 中国重汽集团济南动力有限公司 | A kind of air-assisted SCR urea injection system |
| CN206111295U (en) * | 2016-09-22 | 2017-04-19 | 凯龙高科技股份有限公司 | Liquid way sweeps device for measuring pump |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109252923A (en) * | 2018-09-18 | 2019-01-22 | 潍柴动力股份有限公司 | Gas helps formula urea injection system and its lower electric blowing method |
| CN109252923B (en) * | 2018-09-18 | 2020-06-26 | 潍柴动力股份有限公司 | Air-assisted urea injection system and lower electric blowing method thereof |
| CN113775393A (en) * | 2021-09-18 | 2021-12-10 | 一汽解放汽车有限公司 | Back-flushing three-way structure, urea injection system, back-flushing emptying method and vehicle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170104 |
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| RJ01 | Rejection of invention patent application after publication |