CN204225974U - A kind of hydraulic-driven injection apparatus - Google Patents
A kind of hydraulic-driven injection apparatus Download PDFInfo
- Publication number
- CN204225974U CN204225974U CN201420636088.1U CN201420636088U CN204225974U CN 204225974 U CN204225974 U CN 204225974U CN 201420636088 U CN201420636088 U CN 201420636088U CN 204225974 U CN204225974 U CN 204225974U
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- CN
- China
- Prior art keywords
- valve rod
- spool
- valve
- injection apparatus
- described valve
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- 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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Abstract
The utility model discloses a kind of hydraulic-driven injection apparatus, it comprises valve body, valve rod, spool, valve seat, liquid entering hole, liquid outlet and elastic component, wherein, described valve seat is arranged at the bottom of described valve body and it offers spray orifice, described valve body is provided with liquid entering hole and liquid outlet, and the holding cavity described valve body offered for helical pitch, elastic component is disposed with from top to bottom in described holding cavity, valve rod and spool, described elastic component is pressed on the top of described valve rod, described valve rod offers relief hole, spool is installed in the bottom of described valve rod, the bottom of described spool is plane structure, valve land is pressed on valve seat by plane sealing, described liquid entering hole flow area is greater than the flow area of relief hole on valve rod.The injection apparatus that above-mentioned hydraulic-driven injection apparatus utilizes fluid pressure difference to open and close to reach valve, has structure simple, is convenient to processing, the advantage that cost is low, in turn ensure that sealing and usage requirement simultaneously.
Description
Technical field
The utility model relates to a kind of injection apparatus, particularly relates to a kind of hydraulic-driven injection apparatus for SCR ejecting system.
Background technique
Referring to for selective catalytic conversion system of diesel engine SCR (Selective Catalyst Reduction) is arranged in diesel engine automobile air exhausting system, and the NOx in diesel emission is catalysed and reduced into N
2and O
2catalytic reduction device, select aqueous solution of urea as reducing agent.Aqueous solution of urea is ejected in the outlet pipe of catalyzer upstream, and under the effect of exhaust gas temperature and air-flow, hydrolysis is produced as CO
2and ammonia, NOx is reduced into free of contamination nitrogen and water as reducing agent by ammonia.Urea liquid is according to engine operating condition quantitative injection.
SCR ejecting system is the important component part of SCR aftertreatment system, the critical component of its injection apparatus whole SCR ejecting system especially, at present, the existing injection apparatus ubiquity complex structure for SCR ejecting system, the shortcoming that machining accuracy is high and with high costs.
Model utility content
The purpose of this utility model is to provide a kind of hydraulic-driven injection apparatus, its have structure simple, be convenient to the feature of processing and cost is low, to solve in prior art for the problems referred to above that the injection apparatus of SCR ejecting system exists.
For reaching this object, the utility model by the following technical solutions:
A kind of hydraulic-driven injection apparatus, it comprises valve body, valve rod, spool, valve seat, liquid entering hole, liquid outlet and elastic component, wherein, described valve seat is arranged at the bottom of described valve body and it offers spray orifice, described valve body is provided with liquid entering hole and liquid outlet, and the holding cavity described valve body offered for helical pitch, elastic component is disposed with from top to bottom in described holding cavity, valve rod and spool, described elastic component is pressed on the top of described valve rod, described valve rod offers relief hole, spool is installed in the bottom of described valve rod, the bottom of described spool is plane structure, valve land is pressed on valve seat by plane sealing, described liquid entering hole flow area is greater than the flow area of relief hole on valve rod.
Especially, described elastic component comprises stop collar, spring and adjustment steel ball for retraining valve rod travel, and described stop collar is arranged at the top of described valve rod, and the bottom of described spring is arranged in stop collar, and described adjustment steel ball is arranged at the top of described spring.
Especially, the bottom sides of described valve rod is provided with mounting hole, and described spool is provided with steel ball, and described spool is socketed in stem bottom mounting hole by steel ball, thus ensures that spool and valve rod link and have certain degrees of freedom each other.
During work, reached by closedown liquid outlet and build pressure object, fluid enters valve inner from liquid entering hole, spool and valve rod be transfixion under the effect of spring force and hydraulic coupling, when liquid outlet is opened, the pressure on valve rod top declines rapidly and can not get supplementing in time, and valve rod obtains acceleration under the fluid power effect of bottom, thus band movable valve plug opens valve seat.When valve seat is opened, because liquid entering hole flow is much larger than emitted dose, and liquid entering hole flow area is greater than the relief hole on valve rod, thus ensures that jet pressure is constant, and the time of opening by controlling liquid outlet accurately can control emitted dose.
The beneficial effects of the utility model are, compared with prior art described hydraulic-driven injection apparatus has the following advantages:
1) utilize valve stem casing tape splicing to have the plane spool of steel ball, namely ensure that the open guidance problem of valve, also solve the sealing problem of valve seat.Namely plane spool operationally ensure that good sealing effect and certain guiding, ensures speed of response; Simultaneously plane spool has certain degrees of freedom to valve rod, to avoiding valve rod and the very high coaxality requirement of sealing surface.
2) valve seat and valve body adopt split type scheme, avoid a deep hole processing difficult problem; And spray orifice outwards can punch from the inside of valve seat, be beneficial to deburring and cleaning attachment.
3) utilize the pressure release of unlatching liquid return hole, close liquid return hole and build pressure, reach the object that valve seat opens and closes, and pressure chamber is constant voltage all the time, reach constant voltage and spray, precision is higher, avoids the cracking pressure problem of conventional valve.
Accompanying drawing explanation
Fig. 1 is the perspective view of the hydraulic-driven injection apparatus that the utility model embodiment 1 provides;
Fig. 2 is the sectional drawing of the hydraulic-driven injection apparatus that the utility model embodiment 1 provides;
Fig. 3 is the partial enlarged drawing at A place in Fig. 2.
In figure:
1, valve body; 2, valve rod; 3, spool; 4, valve seat; 5, liquid entering hole; 6, liquid outlet; 7, stop collar; 8, spring; 9, steel ball is regulated; 10, relief hole; 11, mounting hole; 12, steel ball.
Embodiment
The technical solution of the utility model is further illustrated by embodiment below in conjunction with accompanying drawing.
Refer to shown in Fig. 1 to Fig. 3, in the present embodiment, a kind of hydraulic-driven injection apparatus comprises valve body 1, valve rod 2, spool 3, valve seat 4, liquid entering hole 5, liquid outlet 6, stop collar 7, spring 8 and adjustment steel ball 9, described valve seat 4 is arranged at the bottom of described valve body 1 and it offers spray orifice, described valve body 1 is provided with liquid entering hole 5 and liquid outlet 6, and the holding cavity described valve body 1 offered for helical pitch, be disposed with from top to bottom in described holding cavity and regulate steel ball 9, spring 8, stop collar 7, valve rod 2 and spool 3, described stop collar 7 is arranged at the top of described valve rod 2 for the stroke retraining valve rod 2, the bottom of described spring 8 is arranged in stop collar 7, described adjustment steel ball 9 is arranged at the top of described spring 8.Steel ball 9 is regulated to be carried out the pretightening force of Regulation spring 8 pairs of valve rods 2 by compression distance.
Described valve rod 2 offers relief hole 10, the bottom sides of described valve rod 2 is provided with mounting hole 11, described spool 3 is provided with steel ball 12, and described spool 3 is socketed in valve rod 2 bottom mounting apertures 11 by steel ball 12, thus ensures that spool 3 and valve rod 2 link and have certain degrees of freedom each other.Described spool 3 for bottom be the flat valve of plane structure, spool 3 is taken a seat and is pressed on valve seat 4 by plane sealing, and described liquid entering hole 5 flow area is greater than the flow area of relief hole 10 on valve rod 2.
During work, reached by closedown liquid outlet 6 and build pressure object, it is inner that fluid enters valve body 1 from liquid entering hole 5, spool 3 and valve rod 2 be transfixion under the effect of spring force and hydraulic coupling, when liquid outlet 6 is opened, the pressure on valve rod 2 top declines rapidly and can not get supplementing in time, and valve rod 2 obtains acceleration under the fluid power effect of bottom, thus band movable valve plug 3 opens valve seat 4.When valve seat 4 is opened, because liquid entering hole 5 flow is much larger than emitted dose, and liquid entering hole 5 flow area is greater than the relief hole 10 on valve rod 2, thus ensures that jet pressure is constant, and the time of opening by controlling liquid outlet accurately can control emitted dose.
Above embodiment has just set forth basic principle of the present utility model and characteristic; the utility model does not limit by above-mentioned example; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various change and change, and these changes and change all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (3)
1. a hydraulic-driven injection apparatus, it comprises valve body, valve rod, spool, valve seat, liquid entering hole, liquid outlet and elastic component, it is characterized in that, described valve seat is arranged at the bottom of described valve body and it offers spray orifice, described valve body is provided with liquid entering hole and liquid outlet, and the holding cavity described valve body offered for helical pitch, elastic component is disposed with from top to bottom in described holding cavity, valve rod and spool, described elastic component is pressed on the top of described valve rod, described valve rod offers relief hole, spool is installed in the bottom of described valve rod, the bottom of described spool is plane structure, valve land is pressed on valve seat by plane sealing, described liquid entering hole flow area is greater than the flow area of relief hole on valve rod.
2. hydraulic-driven injection apparatus according to claim 1, it is characterized in that, described elastic component comprises stop collar, spring and adjustment steel ball for retraining valve rod travel, described stop collar is arranged at the top of described valve rod, the bottom of described spring is arranged in stop collar, and described adjustment steel ball is arranged at the top of described spring.
3. hydraulic-driven injection apparatus according to claim 1 and 2, is characterized in that, the bottom sides of described valve rod is provided with mounting hole, and described spool is provided with steel ball, and described spool is socketed in stem bottom mounting hole by steel ball.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420636088.1U CN204225974U (en) | 2014-10-29 | 2014-10-29 | A kind of hydraulic-driven injection apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420636088.1U CN204225974U (en) | 2014-10-29 | 2014-10-29 | A kind of hydraulic-driven injection apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204225974U true CN204225974U (en) | 2015-03-25 |
Family
ID=52924081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420636088.1U Withdrawn - After Issue CN204225974U (en) | 2014-10-29 | 2014-10-29 | A kind of hydraulic-driven injection apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204225974U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104343507A (en) * | 2014-10-29 | 2015-02-11 | 凯龙高科技股份有限公司 | Hydraulic driving type injection device |
-
2014
- 2014-10-29 CN CN201420636088.1U patent/CN204225974U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104343507A (en) * | 2014-10-29 | 2015-02-11 | 凯龙高科技股份有限公司 | Hydraulic driving type injection device |
| CN104343507B (en) * | 2014-10-29 | 2017-07-14 | 凯龙高科技股份有限公司 | A kind of hydraulic-driven injection apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150325 Effective date of abandoning: 20170714 |