CN206386214U - A kind of board-like electric-controlled fuel injector of two-way oil-feed minute hand valve opening without static leakage - Google Patents
A kind of board-like electric-controlled fuel injector of two-way oil-feed minute hand valve opening without static leakage Download PDFInfo
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- CN206386214U CN206386214U CN201720061094.2U CN201720061094U CN206386214U CN 206386214 U CN206386214 U CN 206386214U CN 201720061094 U CN201720061094 U CN 201720061094U CN 206386214 U CN206386214 U CN 206386214U
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Abstract
The purpose of this utility model is to provide a kind of board-like electric-controlled fuel injector of two-way oil-feed minute hand valve opening without static leakage, including electromagnetic valve component, oil injector body, nozzle, long needle-valve, stop collar, control panel, intermediate mass, solenoid valve seat.The utility model has oil pocket in oil injector body indoor design, all it is full of inside oil pocket by high pressure fuel, so that needle-valve coupling part upper and lower ends are in hyperbaric environment, upper and lower ends pressure difference is approximately zero, avoid the electric-controlled fuel injector fuel leakage that the presence of fit clearance is caused between internal coupling part, realize fuel oil without static leakage, and control panel is designed with control chamber, the annular oil-feed metering-orifice that control chamber draining beforehand control plate is closed on intermediate mass, the dynamic quantity of fuel leakage produced during electric-controlled fuel injector real work can effectively be reduced, so as to reduce fuel oil loss, reduce oil pump power consumption, improve the stability of device work, improve injection characteristics.
Description
Technical field
The utility model relates to the Electromagnetic Control oil spout of a kind of electromagnetic control oil sprayer, specifically high-pressure common rail
Device.
Background technology
High pressure co-rail system is as advanced injection system in diesel engine fuel jetting field, with the excellent spy of its own
Property, that is, spray pressure produce and course of injection separate, can accurately Flexible Control distributive value and injection timing, improve diesel oil
The performances such as economy, the emission performance of machine, are widely paid close attention to by people.In the reality for the diesel engine for being equipped with high pressure co-rail system
In the course of work of border, the electric-controlled fuel injector in high pressure co-rail system part haves the shortcomings that fuel leakage, a fuel leakage part
It is due to that fit clearance in electric-controlled fuel injector between each coupling part causes the leakage i.e. static leakage of fuel oil, another part fuel oil is let out
Leakage is that in the course of work of electric-controlled fuel injector, a part of internal combustion oil of cylinder has neither part nor lot in cylinder injection, is directly returned by low pressure oil duct
The dynamic leakage of the i.e. fuel oil caused by low-voltage fuel case is returned to, the leakage of real work intermediate fuel oil causes the wave of high pressure fuel
Take, adds additional the power consumption of high-pressure oil pump, the stability that fueling injection equipment works is had a certain impact.In addition, diesel engine
The quality of energy largely depends on the injection characteristics of electric-controlled fuel injector, its fuel injection characteristic anxious after first delaying, and can effectively reduce
Diesel engine carbon black is discharged and fuel consumption, and needle-valve need to slowly be opened in delay period, rapid after catching fire to open, to ensure foot
Enough high injection rates, needle-valve needs quick closedown during end of injection, to ensure quick oil-break and prevent secondary injection.
The content of the invention
The purpose of this utility model is to provide fuel oil without static leakage and dynamic leakage amount is small, it is first slow rear anxious to realize
Fuel injection characteristic a kind of board-like electric-controlled fuel injector of two-way oil-feed minute hand valve opening without static leakage.
What the purpose of this utility model was realized in：
A kind of board-like electric-controlled fuel injector of two-way oil-feed minute hand valve opening without static leakage of the utility model, it is characterized in that：Bag
Include oil injector body, electromagnetic valve component, solenoid valve seat, intermediate mass, control panel, stop collar, long needle-valve, nozzle, electromagnetic valve component, electricity
Magnet valve seat, intermediate mass, stop collar, nozzle are arranged in oil injector body from top to bottom, and main oil gallery is set in oil injector body；
The electromagnetic valve component includes electromagnetic valve body, control valve rod, and solenoid valve seat is arranged on below electromagnetic valve body, magnetic valve
Formed to set to set in armature, electromagnetic valve body in armature chamber, armature chamber between seat and electromagnetic valve body and wind line in iron core, iron core
Circle, control valve rod is connected with armature, and the upper end of control valve rod is located in iron core, and the lower end of control valve rod is located in solenoid valve seat,
Control to set between the top of valve rod and the iron core above it and the second oil transportation road is set in valve rod back-moving spring, solenoid valve seat, control
Control valve rod epicoele is formed between the middle part of valve rod processed and solenoid valve seat, the second oil transportation road is communicated with control valve rod epicoele；
Set in intermediate mass below solenoid valve seat and low pressure oil duct, middle oil duct, the first oil transportation road, balanced valve are set respectively
Connection oil duct, low pressure oil duct connection low-voltage fuel case, middle oil duct are formed between the lower end of bar and solenoid valve seat and intermediate mass
Connection connection oil duct；
Installed in stop collar and fuel-displaced metering-orifice is set in control panel, control panel, shape between control panel and stop collar on the outside of it
Side oil channel is circularized, annular oil-feed metering-orifice and interstitial hole is formed between intermediate mass lower surface and control panel respectively, long needle-valve
Upper end is located in stop collar, control panel back-moving spring is installed between the top of long needle-valve and control panel, the lower end of long needle-valve is stretched into
In nozzle, control chamber is formed between control panel, stop collar and long needle-valve, annular oil-feed metering-orifice connects the first oil transportation road, middle
Hole is respectively communicated with middle oil duct and fuel-displaced metering-orifice, and control chamber is respectively communicated with fuel-displaced metering-orifice and annular side oil duct, long needle-valve and set
Projection is put, long needle-valve back-moving spring is installed between the projection and stop collar of long needle-valve, oil is formed between long needle-valve and oil injector body
Chamber, forms between long needle-valve and nozzle and sets the first oil circuit and the second oil circuit on minute hand valve oil chamber, long needle-valve respectively, oil pocket difference
Main oil gallery, the first oil transportation road, the second oil transportation road and the first oil circuit are connected, minute hand valve oil chamber is respectively communicated with the first oil circuit and second
Oil circuit；
Oil holding slot is set in nozzle, and the end of nozzle sets spray orifice, and long needle-valve coordinates control spray orifice and oil holding slot with spray orifice
Connection or disconnection, oil holding slot connect the second oil circuit.
The utility model can also include：
1st, when coil is not powered on, control valve rod is crushed on intermediate mass, and control valve rod epicoele is communicated with being connected oil duct, low pressure
Oil duct and middle oil duct and be connected oil duct disconnection, long needle-valve blocks spray orifice；After coil electricity, control valve rod is transported upwards with armature
Dynamic, control valve rod epicoele is disconnected with being connected oil duct, and low pressure oil duct is communicated with being connected oil duct, middle oil duct, the fuel oil in control chamber
Low pressure oil duct is entered through fuel-displaced metering-orifice, middle oil duct, connection oil duct, long needle-valve is lifted, spray orifice oil spout.
Advantage of the present utility model is：The utility model has inside oil pocket, oil pocket all in oil injector body indoor design
It is full of by high pressure fuel so that needle-valve coupling part upper and lower ends are in hyperbaric environment, and upper and lower ends pressure difference is approximately zero, it is to avoid
The electric-controlled fuel injector fuel leakage that the presence of fit clearance is caused between internal coupling part, realizes being let out without static state for fuel oil
Leakage, and it is designed with control chamber control panel, the annular oil-feed metering-orifice that control chamber draining beforehand control plate is closed on intermediate mass,
The dynamic quantity of fuel leakage produced during electric-controlled fuel injector real work can be effectively reduced, so as to reduce fuel oil loss, reduce
Oil pump power consumption, the stability for improving device work, improve injection characteristics.In addition, on control panel fuel-displaced metering-orifice presence
So that draining beforehand control intracavitary fuel pressure declines slowly, long needle-valve is caused to lift slowly, it is long as control cavity pressure declines
Needle-valve opening speed is accelerated, the first oil transportation road of intermediate mass and the second oil transportation road on solenoid valve seat can as oil-feed oil circuit,
The voltage built-up rate of fuel oil in control chamber is accelerated, the seating velocity of long needle-valve, the motion of the long needle-valve of whole work process is improved
Meet requirement anxious after first delaying, it is ensured that electric-controlled fuel injector realization fuel injection characteristic anxious after first delaying, reduce the soot of diesel engine
Discharge and fuel consumption.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model；
Fig. 2 is the structural representation of electromagnetic valve component；
Fig. 3 is control plate part and the structural representation of surrounding oil circuit.
Embodiment
Illustrate below in conjunction with the accompanying drawings and the utility model is described in more detail：
With reference to Fig. 1-3, a kind of board-like electric-controlled fuel injector of two-way oil-feed minute hand valve opening without static leakage of the utility model, it
By electromagnetic valve component 1, rugged housing 2, oil injector body 3, tight cap 5, nozzle 6, solenoid valve seat 8, intermediate mass 9, control panel 10, control
Sheet reset spring 11, stop collar 12, long needle-valve back-moving spring 13, long needle-valve return spring holder 14 and long needle-valve 15 are constituted.Electricity
Electromagnetic valve component 1 is arranged on solenoid valve seat 8, after the completion of arrangement that it is overall together from the loading of the top of oil injector body 3, solenoid valve block
Part 1 includes binding post 18, electromagnetic valve body 19, coil 20, armature 21, locating snap ring 22, iron core 23, valve rod back-moving spring 24, valve rod
Return spring holder 25, sealing ring 26, control valve rod 27, electromagnetic valve body 19 are fixed by rugged housing 2, rugged housing 2 and spray
It is connected through a screw thread between oily body 3, sealing ring 26 is disposed between electromagnetic valve body 19 and oil injector body 3, utilizes rugged housing 2
Electromagnetic valve component 1 is fixed on the top of oil injector body 3, control valve rod 27 is connected by locating snap ring 22 with armature 21, controls valve rod
27 are built in solenoid valve seat 8.Intermediate mass 9, control panel 10, control panel back-moving spring 11, stop collar 12, long needle-valve 15, nozzle 6
Load successively from the lower section of oil injector body 3 from top to bottom, main oil gallery 4, oil injector body 3 and the long institute of needle-valve 15 are provided with oil injector body 3
Confining space formation oil pocket, main oil gallery 4 is connected with oil pocket, and the first oil transportation road 29, low pressure oil duct 33, centre are provided with intermediate mass 9
The second oil transportation road 28, connection oil duct 32, oil pocket and the first oil transportation road 29, the second oil transportation road are also provided with oil duct 34, solenoid valve seat 8
28 are connected, and oil duct 34 and the fuel-displaced metering-orifice 31 of control chamber in the middle of connection are also provided with control panel 10, the center of stop collar 12 is provided with
Through hole, the long upper end of needle-valve 15 is arranged in inside its through hole, and control sheet reset is connected between control panel 10 and the upper end of stop collar 12
Spring 11, inner space that control panel 10, stop collar 12, the three of long needle-valve 15 surround forms control chamber, long needle-valve 15 with it is spacing
Cover and long needle-valve back-moving spring 13 and long needle-valve return spring holder 14 are installed between 12 lower ends, the long lower end of needle-valve 15 is arranged in nozzle
In 6, nozzle 6 is fixed on the lower section of oil injector body 3 using tight cap 5.
It is long that electromagnetic valve component 1, oil injector body 3, nozzle 6, intermediate mass 9 and control panel 10 constitute the utility model two-way oil-feed
The main part of needle-valve orifice-plate type electric-controlled fuel injector.Main oil gallery 4, the intermediate mass 9 of the top of control panel 10 are disposed with oil injector body 3
Inside it is disposed with the first oil transportation road 29, low pressure oil duct 33, middle oil duct 34, solenoid valve seat 8 and is disposed with the second oil transportation road 28, connection
Oil duct 32, oil injector body and long needle-valve enclosed space formation oil pocket, main oil gallery 4, the first oil transportation road 29, the second oil transportation road 28 with
Oil pocket is connected, and fuel oil entered in oil holding slot 17 via oil circuit 16 on main oil gallery 4, oil pocket, long needle-valve 15, via main oil gallery 4, the
One oil transportation road 29, annular oil-feed metering-orifice 30, then pass through the annular around the fuel-displaced metering-orifice 31 and control panel 10 in control panel 10
Side oil channel 35 or via the connection oil duct 32 around main oil gallery 4, the second oil transportation road 28, control valve rod 27, middle oil duct 34,
The annular side oil duct 35 then passed through around fuel-displaced metering-orifice 31 and control panel 10 in control panel 10 can enter control chamber
Interior, middle oil duct 34 is connected by the fuel-displaced metering-orifice 31 on control panel 10 with control chamber, by controlling in electromagnetic valve component 1
Lifting for valve rod 27 of control takes a seat to control the break-make of low pressure oil duct 33 in middle oil duct 34 to intermediate mass 9.
When diesel engine works, the main oil gallery 4 that common rail pipe inner high voltage fuel oil is entered in electric-controlled fuel injector, then full of whole
Oil pocket, a part of fuel oil is entered in oil holding slot 17 by oil circuit 16 in long needle-valve 15, and another part fuel oil passes through the first oil transportation
Road 29, annular oil-feed metering-orifice 30, then pass through the annular side oil around the fuel-displaced metering-orifice 31 and control panel 10 in control panel 10
Connection oil duct 32, middle oil duct 34 around the oil transportation road 28 of road 35 and second, control valve rod 27, are then passed through in control panel 10
Fuel-displaced metering-orifice 31 and control panel 10 around annular side oil duct 35 this two oil circuits enter control panel 10, stop collar 12,
In the control chamber that the long three of needle-valve 15 surrounds, the coil 20 during beginning in electromagnetic valve component 1 is not yet powered, and control valve rod 27 is blocked
The connection of low pressure oil duct 33 in middle oil duct 34 to intermediate mass 9, now high pressure fuel is full of whole control chamber, oil pocket and removes
Each oil duct outside low pressure oil duct 33, long needle-valve 15 is by control chamber inner high voltage fuel oil and the downward work of long needle-valve back-moving spring 13
Firmly it is greater than upward active force of the long needle-valve 15 by the inner high voltage fuel oil of 6 inside oil holding slot of nozzle 17, long needle-valve 15 is crushed on
Spray orifice 7 is blocked on nozzle 6, the external the end of a thread of coil 20 is connected by binding post 18 with diesel engine electric control unit, and coil 20 is powered
Afterwards, iron core 23, armature 21 are gradually magnetized, formed via iron core 23, air gap, the three of armature 21 closed loop magnetic loop, armature 21
Suffered electromagnetic force constantly increases, and finally overcomes the active forces such as pretightning force, the resistance of motion of valve rod back-moving spring 24 to move upwards, control
Valve rod 27 processed is fixed on armature 21 using locating snap ring 22, and follows armature 21 to move upwardly together, and controls lifting for valve rod 27
So that middle oil duct 34 is able to connect with low pressure oil duct 33, the oil duct of the second oil transportation road 28 to middle oil duct 34 is blocked, control
Valve rod 27, using conical surface seal form, for the sealing surface of the oil return line of lower section, is used for the sealing surface of the in-line of top
Flat seal form.High pressure fuel in control chamber passes through the fuel-displaced metering-orifice 31, middle oil duct 34, control valve rod 27 of control panel 10
The connection oil duct 32 of surrounding enters low pressure oil duct 33 and finally returned that in low-voltage fuel case, due to the fuel-displaced metering-orifice 31 of control panel 10
Effect, control chamber internal fuel pressure decrease speed is less than the middle fuel pressure decrease speed of oil duct 34, and fuel oil is slow
Ground is released by fuel-displaced metering-orifice 31, and draining beforehand control plate 10 is greater than middle oil duct 34 by the hydraulic coupling of fuel oil in control chamber
The hydraulic coupling of fuel oil, control panel 10 is still by jack-up, and annular oil-feed metering-orifice 30 is plugged, when control chamber fuel pressure drops to
When to a certain degree, control panel 10 declines, and now annular oil-feed metering-orifice 30 is just opened, and reduces electric-controlled fuel injector whole work process
The dynamic leakage amount of intermediate fuel oil.Long needle-valve 15 is by oil holding slot 17 after control chamber inner high voltage fuel pressure declines to a certain extent
When inner high voltage fuel pressure is more than control chamber inner high voltage fuel oil and long 13 pretightning force of needle-valve back-moving spring, long needle-valve 15 is lifted, spray
Oily device commencement of fuel injection, because fuel oil slowly releases in control chamber, long needle-valve 15 is first slowly opened, with fuel oil in control chamber
The decline of pressure, opening speed is gradually accelerated.When the coil 20 in electromagnetic valve component 1 is powered off, armature 21 is in valve rod back-moving spring
Control valve rod 27 is driven to take a seat in the presence of 24, the connection of middle oil duct 34 and low pressure oil duct 33 is hindered by control valve rod 27 again
The disconnected, oil circuit of the second oil transportation road 28 to middle oil duct 34 is connected, and high pressure fuel is via main oil gallery 4, oil pocket, the first oil transportation road
29th, annular oil-feed metering-orifice 30, then passes through the annular side oil duct around the fuel-displaced metering-orifice 31 and control panel 10 on control panel 10
35 and the second oil transportation road 28, control valve rod 27 around connection oil duct 32, middle oil duct 34, then pass through on control panel 10
Annular side oil duct 35 this two oil circuits around fuel-displaced metering-orifice 31 and control panel 10, which are entered, starts against height in control chamber
Pressure, the increase of oil circuit improves fuel oil voltage built-up rate in control chamber, and long needle-valve 15 is by control chamber inner high voltage fuel oil and long needle-valve
The downward of back-moving spring 13 makes a concerted effort to be more than after upward active force of the long needle-valve 15 by the inner high voltage fuel oil of oil holding slot 17, long needle-valve 15
Take a seat rapidly, fuel injector oil spout stops rapidly.
From the above-mentioned course of work：A kind of board-like electricity of two-way oil-feed minute hand valve opening without static leakage of the utility model
The design for controlling the control panel 10 and its surrounding oil circuit of fuel injector promotes control panel 10 to be in dynamic equilibrium all the time in the course of the work
State, middle oil duct 34 also serves as a part for control chamber oil-feed oil circuit both as a part for control chamber draining oil circuit, control
The annular oil-feed metering-orifice 30 that chamber draining beforehand control plate 10 is closed on intermediate mass 9, can effectively reduce the actual work of electric-controlled fuel injector
As when the dynamic quantity of fuel leakage that produces, and have in the indoor design of oil injector body 3 and filled inside oil pocket, oil pocket by high pressure fuel
It is full so that needle-valve coupling part upper and lower ends are in hyperbaric environment, and upper and lower ends pressure difference is approximately zero, it is to avoid electric-controlled fuel injector
The fuel leakage that the presence of fit clearance is caused between internal coupling part, realize fuel oil without static leakage, so as to reduce
The power consumption of oil pump, the stability for improving device work, improve injection characteristics.In addition, fuel-displaced metering-orifice 31 on control panel 10
It is slow in the presence of causing draining beforehand control intracavitary fuel pressure to decline, cause long needle-valve 15 to lift slowly, with control cavity pressure
Decline, the long opening speed of needle-valve 15 is accelerated, and the first oil transportation road 29 of intermediate mass 9 and the second oil transportation road 28 on solenoid valve seat 8 are equal
The voltage built-up rate of fuel oil in control chamber can be accelerated as oil-feed oil circuit, improve the seating velocity of long needle-valve 15, whole work
The motion of the long needle-valve 15 of process meets first slow rear anxious requirement, it is ensured that electric-controlled fuel injector realizes the fuel injection characteristic for first delaying rear urgency,
Reduce the soot emissions and fuel consumption of diesel engine.
Claims (2)
1. a kind of board-like electric-controlled fuel injector of two-way oil-feed minute hand valve opening without static leakage, it is characterized in that：Including oil injector body, electricity
Electromagnetic valve component, solenoid valve seat, intermediate mass, control panel, stop collar, long needle-valve, nozzle, electromagnetic valve component, solenoid valve seat, centre
Block, stop collar, nozzle are arranged in oil injector body from top to bottom, and main oil gallery is set in oil injector body；
The electromagnetic valve component includes electromagnetic valve body, control valve rod, and solenoid valve seat is arranged on below electromagnetic valve body, solenoid valve seat and
Formed to set in armature chamber, armature chamber between electromagnetic valve body and wound around coil in iron core, iron core is set in armature, electromagnetic valve body, controlled
Valve rod processed is connected with armature, and the upper end of control valve rod is located in iron core, and the lower end of control valve rod is located in solenoid valve seat, control valve
Set between the top of bar and iron core above it and the second oil transportation road is set in valve rod back-moving spring, solenoid valve seat, control valve rod
Middle part and solenoid valve seat between formed control valve rod epicoele, the second oil transportation road with control valve rod epicoele communicate；
Set in intermediate mass below solenoid valve seat and low pressure oil duct, middle oil duct, the first oil transportation road are set respectively, balance valve rod
Connection oil duct, low pressure oil duct connection low-voltage fuel case, middle oil duct connection are formed between lower end and solenoid valve seat and intermediate mass
Connect oil duct；
Installed in stop collar and fuel-displaced metering-orifice is set in control panel, control panel, ring is formed between control panel and stop collar on the outside of it
Shape side oil channel, forms annular oil-feed metering-orifice and interstitial hole, the upper end of long needle-valve respectively between intermediate mass lower surface and control panel
In stop collar, control panel back-moving spring is installed, nozzle is stretched into the lower end of long needle-valve between the top of long needle-valve and control panel
In, control chamber is formed between control panel, stop collar and long needle-valve, annular oil-feed metering-orifice connects the first oil transportation road, interstitial hole point
Not Lian Tong in the middle of oil duct and fuel-displaced metering-orifice, control chamber is respectively communicated with fuel-displaced metering-orifice and annular side oil duct, long needle-valve and sets convex
Rise, long needle-valve back-moving spring is installed between the projection and stop collar of long needle-valve, oil pocket is formed between long needle-valve and oil injector body, it is long
Formed between needle-valve and nozzle on minute hand valve oil chamber, long needle-valve and the first oil circuit and the second oil circuit are set respectively, oil pocket is respectively communicated with
Main oil gallery, the first oil transportation road, the second oil transportation road and the first oil circuit, minute hand valve oil chamber are respectively communicated with the first oil circuit and the second oil
Road；
Oil holding slot is set in nozzle, and the end of nozzle sets spray orifice, and long needle-valve coordinates the company of control spray orifice and oil holding slot with spray orifice
On-off is opened, and oil holding slot connects the second oil circuit.
2. a kind of board-like electric-controlled fuel injector of two-way oil-feed minute hand valve opening without static leakage according to claim 1, it is special
Levying is：When coil is not powered on, control valve rod is crushed on intermediate mass, and control valve rod epicoele is communicated with being connected oil duct, low pressure oil duct
With middle oil duct and being connected oil duct and disconnecting, long needle-valve blocks spray orifice；After coil electricity, control valve rod is moved upwards with armature,
Control valve rod epicoele is disconnected with being connected oil duct, and low pressure oil duct is communicated with being connected oil duct, middle oil duct, and the fuel oil in control chamber is through going out
Oil mass hole, middle oil duct, connection oil duct enter low pressure oil duct, and long needle-valve is lifted, spray orifice oil spout.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720061094.2U CN206386214U (en) | 2017-01-18 | 2017-01-18 | A kind of board-like electric-controlled fuel injector of two-way oil-feed minute hand valve opening without static leakage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720061094.2U CN206386214U (en) | 2017-01-18 | 2017-01-18 | A kind of board-like electric-controlled fuel injector of two-way oil-feed minute hand valve opening without static leakage |
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| Publication Number | Publication Date |
|---|---|
| CN206386214U true CN206386214U (en) | 2017-08-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720061094.2U Active CN206386214U (en) | 2017-01-18 | 2017-01-18 | A kind of board-like electric-controlled fuel injector of two-way oil-feed minute hand valve opening without static leakage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106677942A (en) * | 2017-01-18 | 2017-05-17 | 哈尔滨工程大学 | Two-way oil inlet long-needle-valve hole-plate type electronic control fuel injector without static leakage |
-
2017
- 2017-01-18 CN CN201720061094.2U patent/CN206386214U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106677942A (en) * | 2017-01-18 | 2017-05-17 | 哈尔滨工程大学 | Two-way oil inlet long-needle-valve hole-plate type electronic control fuel injector without static leakage |
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