CN106194706B - A kind of pressure switch with damping hole - Google Patents
A kind of pressure switch with damping hole Download PDFInfo
- Publication number
- CN106194706B CN106194706B CN201610843354.1A CN201610843354A CN106194706B CN 106194706 B CN106194706 B CN 106194706B CN 201610843354 A CN201610843354 A CN 201610843354A CN 106194706 B CN106194706 B CN 106194706B
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- CN
- China
- Prior art keywords
- pressure switch
- damping hole
- pump
- buffer stopper
- metering pump
- 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.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Switches Operated By Changes In Physical Conditions (AREA)
Abstract
The invention discloses a kind of pressure switches with damping hole, it includes the pressure switch ontology being installed on the metering pump pump housing, the bottom of the pressure switch ontology offers bottom outlet, the bottom outlet is connected with the hydraulic cavities in the metering pump pump housing, wherein, buffer stopper is installed in the bottom outlet, the simultaneously final closed damping hole that becomes smaller after being pressurized is offered on the buffer stopper.The above-mentioned pressure switch with damping hole is not only simple in structure, it is easy to accomplish；And work as low temperature environment (11 DEG C of ＜), when measuring air pump inoperative, the liquid (aqueous solution) of metering pump internal hydraulic pressure intracavitary is if remained in pipeline, icing will be solidified, volume expansion, the buffer stopper compressive deformation, the damping hole aperture is forced to be gradually reduced, until blocking completely.Pressure switch damage is avoided, ensure that the normal table work of urea pump.
Description
Technical field
The present invention relates to a kind of pressure switches, more particularly, to a kind of having for selective catalytic conversion system of diesel engine
The pressure switch with damping hole of gas urea liquid supply pump.
Background technology
Refer to being mounted 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 the catalytic reduction device of N2 and O2, selects urea
Aqueous solution is as reducing agent.Aqueous solution of urea is ejected into the exhaust pipe of catalyst upstream, in the effect of exhaust gas temperature and air-flow
Lower hydrolysis is produced as CO2And NOx is reduced into free of contamination nitrogen and water by ammonia, ammonia as reducing agent.
Urea liquid supply pump is essential important component in SCR system, currently, existing for SCR system
Urea liquid supply pump (abbreviation metering pump) has gas urea liquid supply pump, and operating temperature is at -40 DEG C~85 DEG C.However specific
Application process in often will appear part and have gas urea liquid supply pump in low temperature environment (be less than -11 DEG C) work, urea
Solution supply pump will appear failure, the reason is that since pump hydraulic pressure intracavitary urea freezes, volume expansion (expansion rate about 9%) makes meter
Pressure switch damage inside amount pump, breaks down so as to cause metering pump.
The above problem seriously affects the stability of urea pump.As those skilled in the art's problem anxious to be resolved.
Invention content
The purpose of the present invention is to provide a kind of pressure switches with damping hole, are supplied with solving urea liquid in the prior art
The problem of causing pressure switch to be damaged because of urea icing at low ambient temperatures to pump.
For this purpose, the present invention uses following technical scheme：
A kind of pressure switch with damping hole comprising pressure switch ontology is provided with dress on the pressure switch ontology
Distribution, wherein be equipped with buffer stopper in the pilot hole, the simultaneously final closed resistance that becomes smaller after being pressurized is offered on the buffer stopper
Buddhist nun hole.
Particularly, the buffer stopper is the rubber block of cylindrical structure.
Particularly, the damping hole is the circular through hole for being opened in the buffer stopper center, and aperture is 1.5 ㎜.
Particularly, the rubber block is installed on by interference fit in the pilot hole of the pressure switch ontology.
Particularly, the pressure switch ontology is installed on the metering pump pump housing, and is arranged between the metering pump pump housing
There is sealing ring, hydraulic cavities are offered in the metering pump pump housing, the hydraulic cavities are connected with the pilot hole.
Beneficial effects of the present invention are that the pressure switch with damping hole is not only simple in structure compared with prior art,
It is easily achieved；And work as low temperature environment (＜ -11 DEG C), when measuring air pump inoperative, the liquid of metering pump internal hydraulic pressure intracavitary is (water-soluble
Liquid) if remained in pipeline, icing will be solidified, volume expansion forces the buffer stopper compressive deformation, the damping hole hole
Diameter is gradually reduced, until blocking completely.Pressure switch damage is avoided, ensure that the normal table work of urea pump.
Description of the drawings
Fig. 1 is the explosive view for the pressure switch with damping hole that the specific embodiment of the invention 1 provides；
Fig. 2 is the sectional view after the assembly for the pressure switch with damping hole that the specific embodiment of the invention 1 provides；
Fig. 3 is that the stereochemical structure after the assembly for the pressure switch with damping hole that the specific embodiment of the invention 1 provides is shown
It is intended to.
Specific implementation mode
Technical solution to further illustrate the present invention below with reference to the accompanying drawings and specific embodiments.
Shown in please referring to Fig.1 to Fig.3, in the present embodiment, a kind of pressure switch with damping hole includes being installed on metering pump
The bottom of pressure switch ontology 2 on the pump housing 1, the metering pump pump housing 1 offers seal groove, is provided in the seal groove
The bottom of " O " type sealing ring 3, the pressure switch ontology 2 offers bottom outlet, the bottom outlet and the hydraulic pressure in the metering pump pump housing 1
Chamber 4 is connected, and the rubber block 5 of cylindrical structure is equipped in the bottom outlet, after offering compression at the center of the rubber block 5
Become smaller and final closed damping hole 6, the damping hole 6 use aperture for the circular through hole of 1.5 ㎜.
When assembly, first " O " type sealing ring 3 is installed in the seal groove of pressure switch ontology 2, then fills in rubber block 5
Into in the bottom outlet of pressure switch ontology 2, finally pressure switch ontology 2 is installed on the metering pump pump housing 1 and is connected with hydraulic cavities 4
It is logical.
When metering pump works normally, rubber block 5 is on metering pump performance substantially without influence；As low temperature environment (＜-
11 DEG C), when measuring air pump inoperative, the liquid (aqueous solution) of metering pump internal hydraulic pressure intracavitary is if remained in pipeline, Jiu Huining
Ice is consolidated, volume expansion forces 5 compressive deformation of rubber block, 6 aperture of the damping hole to be gradually reduced, until blocking completely.Rubber
5 one side of block can play the role of certain Free up Memory, in addition it can prevent the further contact of the fluid in pipeline
The elastic element of switch internal, to play the role of protecting pressure switch.
Above example is to elaborate that the basic principle and characteristic of the present invention, the present invention are not limited by above-mentioned example,
Without departing from the spirit and scope, the present invention also has various changes, these changes and modifications are both fallen within
In scope of the claimed invention.The scope of the present invention is defined by the appended claims and its equivalents.
Claims (4)
1. a kind of pressure switch with damping hole comprising pressure switch ontology is provided with assembly on the pressure switch ontology
Hole, which is characterized in that be equipped with buffer stopper in the pilot hole, become smaller after compression is offered on the buffer stopper and finally close
Damping hole, the buffer stopper be cylindrical structure rubber block, the pressure switch be mounted on the metering pump pump housing on when, damping
Hole is connected with hydraulic cavities, and the outer diameter of rubber block is more than the internal diameter of hydraulic cavities, and the aperture of damping hole is less than the internal diameter of hydraulic cavities.
2. the pressure switch according to claim 1 with damping hole, which is characterized in that the damping hole is described to be opened in
The circular through hole at buffer stopper center, aperture are 1.5 ㎜.
3. the pressure switch according to claim 2 with damping hole, which is characterized in that the rubber block passes through interference fit
It is installed in the pilot hole of the pressure switch ontology.
4. the pressure switch according to claim 1 with damping hole, which is characterized in that the pressure switch ontology is installed on
On the metering pump pump housing, and it is provided with sealing ring between the metering pump pump housing, hydraulic cavities is offered in the metering pump pump housing,
The hydraulic cavities are connected with the pilot hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610843354.1A CN106194706B (en) | 2016-09-22 | 2016-09-22 | A kind of pressure switch with damping hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610843354.1A CN106194706B (en) | 2016-09-22 | 2016-09-22 | A kind of pressure switch with damping hole |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106194706A CN106194706A (en) | 2016-12-07 |
| CN106194706B true CN106194706B (en) | 2018-09-28 |
Family
ID=58067999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610843354.1A Active CN106194706B (en) | 2016-09-22 | 2016-09-22 | A kind of pressure switch with damping hole |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106194706B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108825338A (en) * | 2018-08-01 | 2018-11-16 | 凯龙高科技股份有限公司 | A kind of low-temperature pressure controller for urea pump |
| CN109989808B (en) * | 2019-04-30 | 2024-06-21 | 凯龙高科技股份有限公司 | Anti-freezing type pressure switch for urea pump |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10349143A1 (en) * | 2003-10-17 | 2005-05-19 | Daimlerchrysler Ag | Metering unit for introducing a reducing agent into an exhaust pipe upstream of a selective catalytic reduction catalyst includes a pressure sensor equipped with a frost compensator |
| JP2009534580A (en) * | 2006-04-25 | 2009-09-24 | ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング | Device for supplying a reducing agent to an exhaust gas system of an internal combustion engine |
| JP2013504707A (en) * | 2009-09-11 | 2013-02-07 | エミテック ゲゼルシヤフト フユア エミツシオンス テクノロギー ミツト ベシユレンクテル ハフツング | Reducing agent feeding device |
| CN105351052A (en) * | 2015-11-24 | 2016-02-24 | 天津星洁汽车排放控制系统有限公司 | Structure for preventing pump from being damaged by liquid freezing in pump in SCR (Selective Catalytic Reduction) system |
| CN206111530U (en) * | 2016-09-22 | 2017-04-19 | 凯龙高科技股份有限公司 | Pressure switch in band stop buddhist nun hole |
-
2016
- 2016-09-22 CN CN201610843354.1A patent/CN106194706B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10349143A1 (en) * | 2003-10-17 | 2005-05-19 | Daimlerchrysler Ag | Metering unit for introducing a reducing agent into an exhaust pipe upstream of a selective catalytic reduction catalyst includes a pressure sensor equipped with a frost compensator |
| JP2009534580A (en) * | 2006-04-25 | 2009-09-24 | ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング | Device for supplying a reducing agent to an exhaust gas system of an internal combustion engine |
| JP2013504707A (en) * | 2009-09-11 | 2013-02-07 | エミテック ゲゼルシヤフト フユア エミツシオンス テクノロギー ミツト ベシユレンクテル ハフツング | Reducing agent feeding device |
| CN105351052A (en) * | 2015-11-24 | 2016-02-24 | 天津星洁汽车排放控制系统有限公司 | Structure for preventing pump from being damaged by liquid freezing in pump in SCR (Selective Catalytic Reduction) system |
| CN206111530U (en) * | 2016-09-22 | 2017-04-19 | 凯龙高科技股份有限公司 | Pressure switch in band stop buddhist nun hole |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106194706A (en) | 2016-12-07 |
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| PB01 | Publication | ||
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Pressure switch with damping hole Effective date of registration: 20210727 Granted publication date: 20180928 Pledgee: Agricultural Bank of China Limited by Share Ltd. Wuxi Xishan branch Pledgor: KAILONG HIGH TECHNOLOGY Co.,Ltd. Registration number: Y2021320010276 |