CN108223075A - A kind of feeding pressure stabilizing device for metering pump - Google Patents
A kind of feeding pressure stabilizing device for metering pump Download PDFInfo
- Publication number
- CN108223075A CN108223075A CN201711475527.XA CN201711475527A CN108223075A CN 108223075 A CN108223075 A CN 108223075A CN 201711475527 A CN201711475527 A CN 201711475527A CN 108223075 A CN108223075 A CN 108223075A
- Authority
- CN
- China
- Prior art keywords
- metering pump
- valve body
- valve
- pressure stabilizing
- stabilizing device
- 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
Links
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]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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- 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
- F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
-
- 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
-
- 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
- F04B53/10—Valves; Arrangement of valves
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a kind of feeding pressure stabilizing devices for metering pump, it includes valve body, valve seat, valve rod and spool, wherein, pilot hole is offered in the valve body, the valve stem seal is set in the pilot hole, the valve seat is fixed on the valve body, the feed pathway being connected with the pressure accumulation chamber of metering pump is offered thereon, the spool is set to the outlet end of the feed pathway, spring is installed, the outlet end that feed pathway is corresponded between the valve seat and valve body forms liquid outlet channel between the valve rod and the spool.The above-mentioned feeding pressure stabilizing device for metering pump is not only simple in structure, small, is easily installed；And it is able to maintain that pressure stability in urea pump, and the accuracy of spray of urea metering pump is improved, so as to meet post processing emission request, while being capable of adjusting work pressure as needed.
Description
Technical field
The invention belongs to liquid to supply technology, more particularly, to a kind of selective catalytic conversion system of diesel engine without pneumaturia
The feeding pressure stabilizing device of plain solution supply pump.
Background technology
Refer to be 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 CO2 and ammonia, and NOx is reduced into free of contamination nitrogen and water by ammonia as reducing agent.
Urea liquid supply pump is essential important component in SCR system, at present, existing for SCR system
Urea liquid supply pump (abbreviation metering pump) point has gas urea liquid supply pump and without gas urea liquid supply pump.It is molten without pneumaturia element
Pressure accumulation cavity pressure influences accuracy of spray very big inside fluid supply pump, and pressure instability will cause accuracy of spray to be deteriorated, so as to arrange
Put exceeded, after-treatment system alarm, engine limit torsion.
Invention content
The purpose of the present invention is to provide a kind of feeding pressure stabilizing device for metering pump, to solve in the prior art without gas
Urea liquid supply pump exists because accuracy of spray is poor caused by pressure transient the problem of.
For this purpose, the present invention uses following technical scheme：
A kind of feeding pressure stabilizing device for metering pump, including valve body, valve seat, valve rod and spool, wherein, the valve body
Pilot hole is inside offered, the valve stem seal is set in the pilot hole, and the valve seat is fixed on the valve body, is opened thereon
Equipped with the feed pathway that the pressure accumulation chamber with metering pump is connected, the spool is set to the outlet end of the feed pathway, described
Spring is installed, the outlet end that feed pathway is corresponded between the valve seat and valve body forms out liquid and leads between valve rod and the spool
Road.
Particularly, the valve rod can adjustably sealed set in the pilot hole, be provided between the valve body
Adjustable lock locking structure.
Particularly, the adjustable lock locking structure includes the external thread section for being opened in the valve stem end, the external screw thread
Clamp nut is equipped in section, threaded hole is offered on the valve body, outer spiral shell is additionally provided on the lateral wall of the clamp nut
Line is assemblied in by external screw thread in the threaded hole opened up on valve body.
Particularly, the end of the external thread section offers the card slot convenient for regulating valve stem.
Particularly, limiting section is both provided at the top of the bottom of the valve rod and spool, the both ends of the spring are placed on two
Outside the limiting section of person.
Particularly, mounting portion is extended with outside the valve body, valve body is installed on metering pump by fixing screws by mounting portion.
Particularly, it between the valve rod and pilot hole, is mounted between the outlet end of spool and the feed pathway close
Seal.
Beneficial effects of the present invention are, compared with prior art the feeding pressure stabilizing device for metering pump not only structure
Simply, it is small, it is easily installed；And it is able to maintain that pressure stability in urea pump, the accuracy of spray of urea metering pump is improved, from
And meet post processing emission request, while being capable of adjusting work pressure as needed.
Description of the drawings
Fig. 1 is the explosive view for the feeding pressure stabilizing device for metering pump that the specific embodiment of the invention provides；
Fig. 2 is the sectional view for the feeding pressure stabilizing device for metering pump that the specific embodiment of the invention provides；
Fig. 3 is the installation diagram for the feeding pressure stabilizing device for metering pump that the specific embodiment of the invention provides.
Specific embodiment
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 feeding pressure stabilizing device for metering pump including valve body 1,
Valve seat 2, valve rod 3 and spool 4, pilot hole 5 is offered in the valve body 1, and the valve rod 3 passes through the first sealing ring 6a sealing installations
In in the pilot hole 5, and adjustable lock locking structure is provided between the valve rod 3 and the valve body 1, the adjustable locking
Structure includes being opened in the external thread section 30 of 3 end of valve rod, and clamp nut 7 is equipped on the external thread section 30, described
Threaded hole 8 is offered on valve body 1, external screw thread 70 is additionally provided on the lateral wall of the clamp nut 7, is assembled by external screw thread 70
In in the threaded hole 8 opened up on valve body 1, the end of the external thread section 30 offers convenient for regulating valve stem 3 position in pilot hole 5
The card slot 31 put.
The valve seat 2 is fixed on by soket head cap screw 9 on the valve body 1, and is offered on the valve seat 2 and metering pump
The feed pathway 11 that is connected of pressure accumulation chamber 10, the spool 4 is set to the feed pathway 11 by the second sealing ring 6b
Outlet end, the bottom of the valve rod 3 and the top of spool 4 are both provided with limiting section 12, and the both ends of spring 13 are placed on the institute of the two
It states outside limiting section 12, the outlet end that feed pathway 11 is corresponded between the valve seat 2 and valve body 1 forms liquid outlet channel 14.
Mounting portion 15 is extended with outside the valve body 1, valve body 1 is installed on pressure accumulation chamber by cruciform slot screw 16 by mounting portion 15
In 10.
For metering pump when normal work, extra liquid is open-top from liquid outlet channel 14 by spool 4 through feed pathway 11
Overflow is gone out, and so as to which urea pump internal pressure be kept to stablize, improves accuracy of spray, final to meet post processing emission request.Simultaneously
The elastic force of spring 13 is changed by position of the regulating valve stem 3 in pilot hole 5, so as to adjust the operating pressure of metering pump.
Above example is to elaborate the basic principle and 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 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 (7)
1. a kind of feeding pressure stabilizing device for metering pump, including valve body, valve seat, valve rod and spool, which is characterized in that described
Pilot hole is offered in valve body, the valve stem seal is set in the pilot hole, and the valve seat is fixed on the valve body,
On offer the feed pathway being connected with the pressure accumulation chamber of metering pump, the spool is set to the outlet end of the feed pathway,
Spring is installed, the outlet end that feed pathway is corresponded between the valve seat and valve body is formed out between the valve rod and the spool
Liquid channel.
2. the feeding pressure stabilizing device according to claim 1 for metering pump, which is characterized in that the valve rod can be adjustably
Sealed set is provided with adjustable lock locking structure in the pilot hole between the valve body.
3. the feeding pressure stabilizing device according to claim 2 for metering pump, which is characterized in that the adjustable lock tight knot
Structure includes the external thread section for being opened in the valve stem end, is equipped with clamp nut on the external thread section, is opened on the valve body
Equipped with threaded hole, external screw thread is additionally provided on the lateral wall of the clamp nut, is assemblied in what is opened up on valve body by external screw thread
In threaded hole.
4. the feeding pressure stabilizing device according to claim 3 for metering pump, which is characterized in that the end of the external thread section
Portion offers the card slot convenient for regulating valve stem.
5. the feeding pressure stabilizing device according to claim 1 for metering pump, which is characterized in that the bottom of the valve rod and
Limiting section is both provided at the top of spool, the both ends of the spring are placed on outside the limiting section of the two.
6. the feeding pressure stabilizing device according to claim 1 for metering pump, which is characterized in that be extended with outside the valve body
Valve body is installed on metering pump by mounting portion, fixing screws by mounting portion.
7. the feeding pressure stabilizing device according to claim 1 for metering pump, which is characterized in that the valve rod and pilot hole
Between, it is mounted on sealing ring between the outlet end of spool and the feed pathway.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711475527.XA CN108223075A (en) | 2017-12-29 | 2017-12-29 | A kind of feeding pressure stabilizing device for metering pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711475527.XA CN108223075A (en) | 2017-12-29 | 2017-12-29 | A kind of feeding pressure stabilizing device for metering pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108223075A true CN108223075A (en) | 2018-06-29 |
Family
ID=62646970
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711475527.XA Pending CN108223075A (en) | 2017-12-29 | 2017-12-29 | A kind of feeding pressure stabilizing device for metering pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108223075A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201474664U (en) * | 2009-06-03 | 2010-05-19 | 新疆精工刀具机械设备有限公司 | Pressure-adjustable gas safety recovery unit |
| CN101988494A (en) * | 2010-11-12 | 2011-03-23 | 无锡市凯龙汽车设备制造有限公司 | Pressure stabilizing device of metering pump |
| CN201953636U (en) * | 2011-01-18 | 2011-08-31 | 无锡市凯龙汽车设备制造有限公司 | Pressure adjusting valve used for metering pump |
| CN103032612A (en) * | 2012-12-12 | 2013-04-10 | 中国航天科技集团公司第六研究院第十一研究所 | Dual-opening-pressure dual-displacement safety valve |
| CN203272910U (en) * | 2012-12-30 | 2013-11-06 | 尤斌 | High-pressure water safety valve |
| US20150107701A1 (en) * | 2013-10-17 | 2015-04-23 | Globe Union Industrial Corp. | Regulator valve |
| CN107143677A (en) * | 2017-05-26 | 2017-09-08 | 上海航天控制技术研究所 | A kind of direct-acting overflow valve |
-
2017
- 2017-12-29 CN CN201711475527.XA patent/CN108223075A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201474664U (en) * | 2009-06-03 | 2010-05-19 | 新疆精工刀具机械设备有限公司 | Pressure-adjustable gas safety recovery unit |
| CN101988494A (en) * | 2010-11-12 | 2011-03-23 | 无锡市凯龙汽车设备制造有限公司 | Pressure stabilizing device of metering pump |
| CN201953636U (en) * | 2011-01-18 | 2011-08-31 | 无锡市凯龙汽车设备制造有限公司 | Pressure adjusting valve used for metering pump |
| CN103032612A (en) * | 2012-12-12 | 2013-04-10 | 中国航天科技集团公司第六研究院第十一研究所 | Dual-opening-pressure dual-displacement safety valve |
| CN203272910U (en) * | 2012-12-30 | 2013-11-06 | 尤斌 | High-pressure water safety valve |
| US20150107701A1 (en) * | 2013-10-17 | 2015-04-23 | Globe Union Industrial Corp. | Regulator valve |
| CN107143677A (en) * | 2017-05-26 | 2017-09-08 | 上海航天控制技术研究所 | A kind of direct-acting overflow valve |
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| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180629 |