CN206681895U - A kind of fuel oil injector equipped with metering servovalve - Google Patents
A kind of fuel oil injector equipped with metering servovalve Download PDFInfo
- Publication number
- CN206681895U CN206681895U CN201720467591.2U CN201720467591U CN206681895U CN 206681895 U CN206681895 U CN 206681895U CN 201720467591 U CN201720467591 U CN 201720467591U CN 206681895 U CN206681895 U CN 206681895U
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- CN
- China
- Prior art keywords
- metering
- control
- metering servovalve
- matching parts
- needle shaft
- Prior art date
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- Withdrawn - After Issue
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Abstract
A kind of fuel oil injector equipped with metering servovalve disclosed in the utility model, injector nozzle matching parts including nozzle holder and installed in nozzle holder bottom and the metering servovalve in fuel injection housing body, metering servovalve is opened by the drive magnetic valve installed in nozzle holder top, metering servovalve drives injector nozzle matching parts to open and close during open and close, connected between the Needle shaft upper end in control-rod lower end and injector nozzle matching parts in its metering servovalve using flexible way, and the flexible way connects at least so that the control-rod in metering servovalve is in the moving directions of X Y two and X, Y-axis is free around direction of rotation.Connected between the Needle shaft upper end in control-rod lower end and injector nozzle matching parts in metering servovalve of the present utility model using flexible way, reduce movement interference and internally-damped to greatest extent, moving up and down the Needle shaft in injector nozzle matching parts, precision is higher, and minimum oil volume control performance is more preferable.
Description
Technical field
It the utility model is related to a kind of fuel oil injector equipped with metering servovalve.
Background technology
Fuel oil injector for fuel of internal combustion engine injection generally comprises nozzle holder and under nozzle holder
The injector nozzle matching parts in portion and the metering servovalve in fuel injection housing body, metering servovalve pass through installed in fuel injection housing
The drive magnetic valve on body top is opened, and metering servovalve drives injector nozzle matching parts to open and close during open and close.
Usually from common rail pipe high pressure fuel by fuel inlet fitting introduce fuel injection housing body in after, be divided into two-way, a-road-through
The mesopore inner chamber crossed in fuel injection housing body directly reaches the atomizer end in injector nozzle matching parts, to be sprayed；Another way enters
Control chamber in metering servovalve.When fuel oil injector does not work, by accurately calculating, the control chamber in metering servovalve
Caused hydraulic coupling is transferred to the Needle shaft in injector nozzle matching parts by the control-rod in metering servovalve, makes Needle shaft lower end
Conical sections are pressed on the internal conical surface in needle-valve body and sealed, fuel oil injector not oil spout.
Electromagnet as now given in drive magnetic valve is powered, and is opened by the electromagnet executive component in drive magnetic valve
Metering servovalve so that the control chamber pressure in metering servovalve declines, and the Needle shaft in injector nozzle matching parts is in upward fluid power
Moved up under promotion, the conical sections of Needle shaft lower end is departed from the internal conical surface in needle-valve body, open under needle-valve body
The atomizer passage at end, to the fuel oil of engine chamber jet atomization.
To realize above-mentioned function, the Needle shaft in control-rod and injector nozzle matching parts in the metering servovalve of concatenation must lead to
Cross accurate calculate and reach axial spring forces, the balance of hydraulic coupling, wherein mostly hydraulic coupling.Due in metering servovalve
Needle shaft in control-rod and injector nozzle matching parts is required for strict hydraulic packing, therefore, control-rod in metering servovalve and
The radial direction that takes various forms or end face seal key element is needed to be combined in Needle shaft structure design in injector nozzle matching parts
Sealing.
As engine combustion requires that fuel oil injector injecting times are more and more, up to 9 times, plus emitted dose stability
It is required that more and more higher, movement response speed is more and more faster, and this is required in control-rod and injector nozzle matching parts in metering servovalve
Needle shaft open and closing motion (rise and decline) is stable, quick, kinetic damping is the smaller the better, therefore the metering concatenated is watched
Take the Needle shaft in control-rod and injector nozzle matching parts in valve and sealing Combination Design be movement parts moving-mass key.
Typically the Needle shaft in the control-rod and injector nozzle matching parts in metering servovalve is designed to reach above-mentioned purpose
It is overall, but manufacturability is poor, and industrial production cost is high.Therefore to reduce industrial production cost and improving the manufacturability of processing,
The Needle shaft in control-rod and injector nozzle matching parts in metering servovalve is broken generally into two parts and uses various connected modes
It is attached, a kind of electromagnetic measurement for fuel nozzle as disclosed in Chinese invention patent Authorization Notice No. CN1096549C
Valve, the control-rod in metering servovalve therein are connected by one grade of disk with the Needle shaft in injector nozzle matching parts.This connection side
Formula easily causes movement interference and internally-damped so that the Needle shaft mobile accuracy in injector nozzle matching parts declines.
Needle shaft in injector nozzle matching parts needs good guidance quality in needle-valve body, and Needle shaft can only be in needle-valve body
Axially move up and down and rotated around axial line, other frees degree are limited, to ensure the control-rod in the metering servovalve of concatenation
With the allomeric function of the Needle shaft in injector nozzle matching parts, the control-rod in metering servovalve must be set using floating sealing structure
Meter, greatly reduces cost and the chance of failure of industrialized production part.
Utility model content
The purpose of this utility model is for above-mentioned present in the existing fuel oil injector in fuel of internal combustion engine injection
Technical problem and a kind of fuel oil injector equipped with metering servovalve is provided.The fuel oil injector equipped with metering servovalve
Solved the above problems in a manner of simple economy, while reduce unnecessary floating seal link, reduce the upper part failure wind of manufacture
Danger.
In order to realize above-mentioned purpose of utility model, technical scheme is as follows used by the utility model：
A kind of fuel oil injector equipped with metering servovalve, including nozzle holder and installed in nozzle holder bottom
Injector nozzle matching parts and the metering servovalve in fuel injection housing body, metering servovalve pass through installed in nozzle holder
The drive magnetic valve on top is opened, and metering servovalve drives injector nozzle matching parts to open and close during open and close, its
It is characterised by, using soft between the Needle shaft upper end in control-rod lower end and the injector nozzle matching parts in the metering servovalve
Property mode connect, and flexible way connection at least so that control-rod in the metering servovalve in the moving directions of X-Y two and
X, Y-axis is free around direction of rotation.
In a preferred embodiment of the present utility model, control-rod lower end and the oil spout in the metering servovalve
Connected between Needle shaft upper end in mouth couple by a flexible boot.
In a preferred embodiment of the present utility model, control-rod lower end and the oil spout in the metering servovalve
Needle shaft upper end diameter in mouth couple is identical.
In a preferred embodiment of the present utility model, the endoporus of the flexible boot and the control in the metering servovalve
Gapless or gap very little between Needle shaft upper end in bar lower end processed, the injector nozzle matching parts, to ensure the metering servo
The sealed volume pressure formed between Needle shaft upper end end face in the end face and the injector nozzle matching parts of control-rod lower end in valve
Force value is less than 10bar.
In a preferred embodiment of the present utility model, control-rod lower end and the spray in the metering servovalve
Ring recess is provided with Needle shaft upper end in oil nozzle couple, is made under the control-rod in the flexible boot and the metering servovalve
Sealed between Needle shaft upper end in end, the injector nozzle matching parts more preferable.
In a preferred embodiment of the present utility model, the control-rod lower end afterbody in the metering servovalve is provided with
Arc surface, to eliminate because of interference caused by swing.
Due to using technical scheme as above, measured in the fuel oil injector of the present utility model equipped with metering servovalve
Connected between the Needle shaft upper end in control-rod lower end and the injector nozzle matching parts in servo valve using flexible way, maximum limit
Degree reduces movement interference and internally-damped, the Needle shaft in injector nozzle matching parts is moved up and down precision higher, minimum oil volume
Control performance is more preferable.
Brief description of the drawings
Fig. 1 is structural representation of the utility model equipped with the fuel oil injector of metering servovalve.
Fig. 2 is enlarged diagram at Fig. 1 I.
Embodiment
Referring to Fig. 1 and Fig. 2, the fuel oil injector equipped with metering servovalve shown in figure includes a nozzle holder
2, there is high pressure fuel oil inlet passage 3 side on the top of nozzle holder 2, and opposite side is provided with drainback passage 24；Nozzle holder 2
Inside it is provided with metering servovalve external volume 5.Fuel inlet fitting 30 is installed on high pressure fuel oil inlet passage 3.
Metering servovalve 7 is housed in nozzle holder 2, the metering servovalve 7 is by valve pocket 14, control-rod back-moving spring 6a
And control-rod 6 forms.
Valve pocket 14 is positioned by step 16 and cylindrical section 17 with the opposite site of nozzle holder 2.Whole metering servovalve 7 is used
Plug screw 18 is pressed abd fixed in nozzle holder 2, and now control-rod 6 can only move up and down and around axis rotation vertically.Control
Bar 6 resets by control-rod back-moving spring 6a.
Middle part in valve pocket 14 is arranged below a functional hole 13 being connected with the upper end of control-rod 6, and the upper end of control-rod 6 is inserted
Enter into the functional hole 13, functional hole 13 enables the hole of 6 opposing valve sleeves of control-rod 14 to move axially, while and can ensures work(
It can be sealed between hole 13 and control-rod 6.
By the part-circular periphery face of the top surface of the upper end of control-rod 6, the hole top surface of functional hole 13 and functional hole 13 define Lai
Control room volume 15 and the pressure of metering valve external volume 5 it is independent.Control room volume 15 passes through the oil-feed that is arranged on valve pocket 14
Dip hatch 8 communicates with the high pressure fuel oil inlet passage 3 in nozzle holder 2, while control room volume 15 is also by being arranged on valve
Oil measurement hole 9 of removing heat by catharsis on set 14 communicates with drainback passage 24.
One drive magnetic valve 31 is installed on the top of nozzle holder 2, the ball 31a in drive magnetic valve 31 is in driving electricity
When magnet valve is powered, unlatching is removed heat by catharsis oil measurement hole 9, and the oil measurement hole 9 that makes to remove heat by catharsis communicates with drainback passage 24.If drive magnetic valve is broken
When electric, ball 31a in drive magnetic valve 31 removes heat by catharsis closing oil measurement hole 9, the oil measurement hole 9 that makes to remove heat by catharsis with drainback passage 24 not
Communicate.
Injector nozzle matching parts 23 is connected with by nozzle cap nut 20 in the lower axial end of nozzle holder 2.Injector nozzle matching parts 23
Be made up of needle-valve body 4 and Needle shaft 9, the end face 22 of needle-valve body 4 and outside cylinder 21 by with nozzle cap nut 20 and fuel injection housing
The bottom surface of body 2 positions and fixes.
There are one section of cylinder engagement section 13a, cylinder engagement section 13a to cause Needle shaft 9 between Needle shaft 9 and needle-valve body 4
The relative needle-valve body 4 of energy moves axially, while and can ensures cylinder engagement section 13a gap sealing, the lower end of Needle shaft 9
Conical sections 25 seal with the internal conical surface 26 in needle-valve body 4, and sealed diameter is d in diagram.Therefore Needle shaft 9 can be in needle-valve
Moved axially up and down in body 4, be moved down into the conical sections 25 of the lower end of Needle shaft 9 and the internal conical surface 26 in needle-valve body 4
Untill coincidence.The bottom of needle-valve body 4 is provided with nozzle opening 32.
The upper end 27 of Needle shaft 9 is identical with the diameter of lower end 28 of control-rod 6, is connected with flexible boot 10, flexible boot 10 it is interior
Hole coordinates with the upper end 27 of Needle shaft 9, the lower end 28 of control-rod 6, and between the endoporus of flexible boot 10 and the upper end 27 of Needle shaft 9
Abutting end 12, abutting end 12a gap very littles or gapless between the endoporus of flexible boot 10 and the lower end 28 of control-rod 6, with
Ensure that the termination of upper end 27 of Needle shaft 9 forms the pressure of sealed volume 11 with the termination of lower end 28 of control-rod 6 because of structural design
It is worth very little (such as less than 10 bars).
With the injection pressure more and more higher of engine calls, No leakage structure design will be generally used, it is illustrated that allusion quotation
Type No leakage structure is that the inner chamber of the metering valve external volume 5 and needle-valve body 4 in nozzle holder 2 is fuel injector injection work
Pressure, the component that control-rod 6 forms with Needle shaft 9 are placed in injection high pressure.
Injector nozzle matching parts 23 is upward by Needle shaft 9 therein according to the oil spout of fuel oil injector need of work or stopping
Movement moves down compression seal line d come what is realized, and with engine emission requirements more and more higher, refinement is wanted in each oil spout
Really, it is desirable to which needle-valve shift position is accurately and repetition stability is good in whole work process.
Control-rod 6 and Needle shaft 9 are divided into two pieces by the utility model to reduce manufacturing cost, flexible even with flexible boot 10
Connect.At least so that the control-rod 6 in metering servovalve 7 is free around direction of rotation in the moving directions of X-Y two and X, Y-axis.
The component that Needle shaft 9 forms with control-rod 6, one end are connected with control room volume 15, one end and injector nozzle matching parts 23
In the nozzle bore 32 of the bottom of needle-valve body 4 connect, stress is extremely complex, it is necessary to which what is accurately controlled is axially in practical work process
Power, mainly hydraulic coupling in axial force, to reduce governing factor, the F in design only in control figure is (by the pressure of control room volume 15
Produce) and f (being produced by the sealed section d of Needle shaft 9), when carrying out fuel injector design, the power is calculated and verified by accurate
, do not allow to produce axial additional force.
Meanwhile the Needle shaft 9 connected by flexible boot 10 and control-rod 6, movement interference can be minimized during work
And it is internally-damped, moving up and down part component, precision is higher, and minimum oil volume control performance is more preferable.
To play above-mentioned effect, on the upper end 27 of Needle shaft 9 and the lower end 28 of control-rod 6 design go too far groove 19,
19a, make the upper end 27 of flexible boot 10 and Needle shaft 9 and the better tightness of lower end 28 of control-rod 6.
Meanwhile to swing rod member, arc surface 29 is designed in the breech face of control-rod 6, eliminate because of interference caused by swing.
Claims (6)
1. a kind of fuel oil injector equipped with metering servovalve, including nozzle holder and installed in nozzle holder bottom
Injector nozzle matching parts and the metering servovalve in fuel injection housing body, metering servovalve pass through on nozzle holder
The drive magnetic valve in portion is opened, and metering servovalve drives injector nozzle matching parts to open and close during open and close, and it is special
Sign is, using flexibility between the Needle shaft upper end in control-rod lower end and the injector nozzle matching parts in the metering servovalve
Mode connects, and the flexible way connects at least so that the control-rod in the metering servovalve is in the moving directions of X-Y two and X, Y
Axle is free around direction of rotation.
2. a kind of fuel oil injector equipped with metering servovalve as claimed in claim 1, it is characterised in that the metering is watched
Take and connected by a flexible boot between the Needle shaft upper end in the control-rod lower end and the injector nozzle matching parts in valve.
3. a kind of fuel oil injector equipped with metering servovalve as claimed in claim 2, it is characterised in that the metering is watched
The control-rod lower end taken in valve is identical with the Needle shaft upper end diameter in the injector nozzle matching parts.
A kind of 4. fuel oil injector equipped with metering servovalve as claimed in claim 2, it is characterised in that the flexible boot
Endoporus and the metering servovalve in control-rod lower end, between the Needle shaft upper end in the injector nozzle matching parts gapless or
Gap very little, to ensure on the Needle shaft in the end face of the control-rod lower end in the metering servovalve and the injector nozzle matching parts
The sealed volume pressure value formed between the end face of end is less than 10bar.
5. a kind of fuel oil injector equipped with metering servovalve as claimed in claim 2, it is characterised in that in the metering
Ring recess is provided with the Needle shaft upper end in control-rod lower end and the injector nozzle matching parts in servo valve.
6. a kind of fuel oil injector equipped with metering servovalve as claimed in claim 2, it is characterised in that the metering is watched
The control-rod lower end afterbody taken in valve is provided with arc surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720467591.2U CN206681895U (en) | 2017-04-28 | 2017-04-28 | A kind of fuel oil injector equipped with metering servovalve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720467591.2U CN206681895U (en) | 2017-04-28 | 2017-04-28 | A kind of fuel oil injector equipped with metering servovalve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206681895U true CN206681895U (en) | 2017-11-28 |
Family
ID=60406800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720467591.2U Withdrawn - After Issue CN206681895U (en) | 2017-04-28 | 2017-04-28 | A kind of fuel oil injector equipped with metering servovalve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206681895U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106939863A (en) * | 2017-04-28 | 2017-07-11 | 南岳电控（衡阳）工业技术股份有限公司 | A kind of fuel oil injector equipped with metering servovalve |
-
2017
- 2017-04-28 CN CN201720467591.2U patent/CN206681895U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106939863A (en) * | 2017-04-28 | 2017-07-11 | 南岳电控（衡阳）工业技术股份有限公司 | A kind of fuel oil injector equipped with metering servovalve |
| CN106939863B (en) * | 2017-04-28 | 2022-05-17 | 南岳电控（衡阳）工业技术股份有限公司 | Fuel injector equipped with metering servo valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20171128 Effective date of abandoning: 20220517 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20171128 Effective date of abandoning: 20220517 |