CN106762284A - A kind of resonance bypass type electric-controlled fuel injector with ditch - Google Patents
A kind of resonance bypass type electric-controlled fuel injector with ditch Download PDFInfo
- Publication number
- CN106762284A CN106762284A CN201710034920.9A CN201710034920A CN106762284A CN 106762284 A CN106762284 A CN 106762284A CN 201710034920 A CN201710034920 A CN 201710034920A CN 106762284 A CN106762284 A CN 106762284A
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- valve
- needle
- oil
- hole
- fuel
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1886—Details of valve seats not covered by groups F02M61/1866 - F02M61/188
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1893—Details of valve member ends not covered by groups F02M61/1866 - F02M61/188
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
- F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
- F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
- F02M63/0035—Poppet valves, i.e. having a mushroom-shaped valve member that moves perpendicularly to the plane of the valve seat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
- F02M63/0049—Combined valve units, e.g. for controlling pumping chamber and injection valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
It is an object of the invention to provide a kind of resonance bypass type electric-controlled fuel injector with ditch, the part such as including injector head, oil injector body, current limliting valve module, electromagnetic valve component, tight cap, needle valve assembly, nozzle, needle seating.Pressure accumulation chamber is arranged in oil injector body, is connected with current limliting valve module with main fuel feed hole, it is ensured that in big pulsewidth oil spout, the stabilization of each cylinder injection process.Flow-limiting valve component bottom is machined with resonant through holes and resonance throttle orifice, and the fluctuation of the fuel oil by current limliting valve module is efficiently reduced using the principle of stacking of ripple.It is disposed with control slide block inside control chamber, and is contacted with intermediate mass, plays a part of to slow down the injection rate at injection initial stage and accelerate needle-valve and take a seat response.Needle-valve body surface sets the ditch of micron level depth, can effectively improve the stability of hole flow, reduces fuel injector cavitation pitting degree.It is the hydro-cushion of needle valve assembly partial interior, poor without static pressure, realize function of the fuel injector without static leakage.
Description
Technical field
The present invention relates to a kind of engine fuel injector, specifically high pressure common rail injector.
Background technology
With the fuel consumption and emission characteristic requirements more and more higher to engine, the limitation of discharge essentially consists in nitrogen oxygen
Two aspects of compound and particulate matter.In order to reduce the discharge of nitrogen oxides, it is desirable to which the instantaneous injection rate to injection process enters
Row control, reduces the injection rate at injection initial stage.At the end of course of injection, fuel injector again must oil-break, i.e. needle-valve be taken a seat rapidly
Response is fast, to reduce the forming amount of particulate matter.Therefore requirement of the diesel emission to fuel injector is its injection process can be formed
Initial stage opens slow and terminates to close fast Fuel Injection Rate Shaping.As what fuel injector worked gradually increases, flow velocity is accelerated, fuel injector
Interior hole and cavitation pitting degree are substantially strengthened, fuel injector reliability decrease.
Additionally, the precise control of multi-injection fuel injection characteristic is the sharpest edges of diesel engine high-pressure co-rail electronic control injection system
And key technology.In high pressure co-rail system multi-injection, the surge pressure fluctuation that injection causes directly influences multi-injection and manages
Think the realization of fuel injection characteristic, and then influence the performance of diesel engine.
The content of the invention
It is an object of the invention to provide in multi-injection, can guarantee that fuel pressure small, the quick response of fluctuation, can realize
The Fuel Injection Rate Shaping and a kind of resonance with ditch without static leakage function of " initial stage is slow and terminates fast " and reduction cavitation pitting
Bypass type electric-controlled fuel injector.
The object of the present invention is achieved like this：
A kind of resonance bypass type electric-controlled fuel injector with ditch of the present invention, it is characterized in that：Including injector head, fuel injector
Body, current limliting valve module, electromagnetic valve component, needle valve assembly, nozzle, needle seating, descending high-pressure oil passage, injector head are arranged on oil spout
Body top, injector head inside sets main fuel feed hole, and oil injector body inside sets pressure accumulation chamber, main fuel feed hole and pressure accumulation chamber phase
Logical, current limliting valve module is arranged in pressure accumulation chamber, and electromagnetic valve component, needle valve assembly, needle seating are installed in oil injector body lower end successively, tightly
Cap is located at electromagnetic valve component, needle valve assembly, outside needle seating, under the mode that the upper end of tight cap is connected through a screw thread and oil injector body
End is connected；
The current limliting valve module includes limit spring seat, current limliting piston, ball valve return spring holder, support and control sliding block, limit
Position spring base, current limliting piston, ball valve return spring holder are arranged, are installed between limit spring seat and current limliting piston and damped from top to bottom
Spring, support and control sliding block is arranged in ball valve return spring holder, is set between the upper end of support and control sliding block and current limliting piston
Ball valve, mounting ball valve back-moving spring between the lower end of support and control sliding block and ball valve return spring holder below, current limliting piston
In set piston blind hole and metering hole, axial central through hole is set in support and control sliding block, set humorous in ball valve return spring holder
Shaken through hole and resonance throttle orifice, and transition oil pocket, piston blind hole are set between ball valve return spring holder and oil injector body below
Connection pressure accumulation chamber and metering hole, metering hole are connected or disconnected with axial central through hole under the control of ball valve, and resonant through holes are harmonious
The throttle orifice that shakes connects axial central through hole and transition oil pocket；
The electromagnetic valve component includes electromagnet, coil, armature, balance valve rod, valve seat, intermediate mass, is wound on electromagnet
Coil, electromagnet top sets magnetic valve return spring holder, and electromagnet lower section sets armature, armature and magnetic valve return spring holder
Between magnetic valve back-moving spring is set, balance valve rod is located in valve seat, and balance valve rod upper end and armature are connected, and intermediate mass is set
Spill port, middle throttle orifice, middle oil circuit are set below valve seat, in intermediate mass, and middle oil circuit is communicated with middle throttle orifice, returned
Oilhole is connected or disconnected under the control of balance valve rod with middle throttle orifice and fuel tank；
The needle valve assembly includes needle-valve stop collar, control slide block, needle-valve body, and control slide block is located in needle-valve stop collar,
The upper part of needle-valve body is located in needle-valve stop collar, and the lower part of needle-valve body is located in needle seating, control slide block and needle-valve body it
Between form control chamber, in control chamber set control slide block back-moving spring, needle-valve body middle part set bossing, bossing and its
Needle-valve back-moving spring is set between the needle-valve stop collar of top, and the upper surface of control slide block sets intermediate cavity, set in control slide block
Fuel feed hole, control slide block through hole, bleed off circuit are put, fuel feed hole connects intermediate cavity, control slide block through hole point by meter in hole
Not Lian Tong intermediate cavity and control chamber, bleed off circuit connection control chamber, oil holding slot is formed between needle-valve body and needle seating；
The nozzle includes spray orifice and ditch, and spray orifice is machined on needle seating, and ditch is set and needle-valve bottom long surface
On；
Middle oil communication intermediate cavity, descending high-pressure oil passage upper end connection transition oil pocket, through oil injector body, valve seat, in
Between block, needle-valve stop collar, needle seating connection oil holding slot, fuel feed hole connects descending high-pressure oil passage.
The present invention can also include：
1st, the ditch is particularly located between the sealing cone and needle-valve body bottom formed when needle-valve long is taken a seat, ditch
Number is the integral multiple of nozzle hole number, and the depth of ditch is micron order.
2nd, during spray orifice oil spout, the fuel pressure of transition oil pocket declines, current limliting piston, ball valve, support and control sliding block it is overall to
Bottom offset, and ball valve is not landed on ball valve return spring holder, metering hole is communicated with axial central through hole；When the combustion of spray orifice outflow
When oil quality exceedes threshold value, current limliting piston compresses ball valve and it is seated at ball valve return spring holder, metering hole and axial centre
Through hole disconnects；When spray orifice stops oil spout, in the presence of ball valve back-moving spring, current limliting piston, ball valve and support and control sliding block are whole
Body returns to initial position.
3rd, during coil electricity, balance valve rod is moved upwards, and spill port is connected state with fuel tank, and the fuel oil in control chamber leads to
, to fuel tank, needle-valve body is lifted up, and spray orifice opens oil spout for oil circuit, middle throttle orifice and spill port oil return in the middle of crossing；Coil blackout
Afterwards, balance valve rod is moved downward in the effect of magnetic valve back-moving spring, is crushed on intermediate mass upper surface, and spill port breaks with fuel tank
Open；
When spray orifice stops oil spout, control slide block upper surface fuel pressure is higher than its lower surface, and control slide block overcomes control to slide
The initial tension of spring of block reset spring is opened to bottom offset, bleed off circuit, and as fuel oil enters control chamber, control slide block is in control
Under the active force of sliding block back-moving spring, initial position is returned to.
4th, the diameter in the middle part of resonance throttle orifice is less than the diameter at its two ends, and less than the diameter of resonant through holes, resonance throttling
Hole is consistent with the total length of resonant through holes axial direction.
Advantage of the invention is that：Present invention employs pressure accumulation cavity configuration, the pressure of whole injection system can be substantially improved
Fluctuation, interfering with each other when can particularly reduce each fuel injector oil spout.Current limliting valve module is employed in structure of the present invention,
The generation of the abnormal conditions such as abnormal injection is effectively prevent, and resonance structure is added in current limliting valve module, reduced
Fuel pressure is fluctuated, it is ensured that the reliability of fuel economy and fuel injector work is improve while the injection process of normal table
Property.The switch of oil return circuit is adjusted present invention employs solenoid valve control balance valve rod, is conducive to improving the response speed of needle-valve
Degree and control accuracy, there is provided flexible fuel injection characteristic, effectively improve the discharge stability and economy of diesel engine.Control
The bleed off circuit of control slide block can cause that control chamber more rapidly builds pressure in chamber, improve needle-valve response characteristic.Control slide block
The design of throttle orifice and middle throttle orifice ensure that fuel injector in the early stage can slowly oil spout, the formation of reduction nitrogen oxides.This hair
It is bright to employ ditch structure, according to the requirement of actual condition, diameter, depth and the number of ditch are matched, it is improved hole stream
Dynamic stability, reduces the best results of fuel injector cavitation pitting degree.The hydro-cushion of needle valve assembly partial interior, without static pressure
Difference, realizes function of the fuel injector without static leakage.
Brief description of the drawings
Fig. 1 is structural representation of the invention；
Fig. 2 is current limliting valve module schematic diagram；
Fig. 3 is electromagnetic valve component schematic diagram；
Fig. 4 is needle valve assembly schematic diagram；
Fig. 5 is A-A schematic diagrames；
Fig. 6 is nozzle segment structural representation of the present invention.
Specific embodiment
Illustrate below in conjunction with the accompanying drawings and the present invention is described in more detail：
With reference to Fig. 1-6, bypass type electric-controlled fuel injector of the present invention includes injector head 1, current limliting valve module 3, electromagnetic valve component
5th, needle valve assembly 6, nozzle 7, needle seating 9, tight cap 10, oil injector body 11.Injector head 1 carries out mating connection installation by screw thread
On oil injector body 11, and sealed by the sealing ring 2 being placed on oil injector body 11.Master is set in injector head 1 to enter
Oilhole 13, and connected with the pressure accumulation chamber 12 in oil injector body 11.The lower section of pressure accumulation chamber 12 is provided with current limliting valve module 3.Current limliting valve module 3
Inside oil injector body 11, its primary structure include back-up ring 14, damping spring 15, ball valve 17, support and control sliding block 18,
Ball valve back-moving spring 23, ball valve return spring holder 24, current limliting piston 25, limit spring seat 27.Wherein, metering hole 16 and piston
Blind hole 26 is processed on current limliting piston 25, and axial central through hole 19 is processed on support and control sliding block 18, this ensure that fuel oil
Lower section oil circuit can smoothly be flowed to.The lower section of oil injector body 11 is sequentially provided with electromagnetic valve component 5, needle valve assembly 6, is entered by tight cap 10
Row assembly connection.The primary structure of electromagnetic valve component 5 include magnetic valve return spring holder 28, coil 29, armature 30, valve seat 31,
Intermediate mass 34, balance valve rod 36, electromagnet 37, magnetic valve back-moving spring 38.Armature 30 and the balance combination of valve rod 36 are arranged on valve
Inside seat 31.Spill port 32, middle oil circuit 33, middle throttle orifice 35 are processed inside intermediate mass 34, and intermediate mass 34 is limited with needle-valve
Position set 44 and needle-valve body 42 form control chamber 45.The lower section of electromagnetic valve component 5 is needle valve assembly 6, and primary structure includes：Control slide block
Back-moving spring 41, needle-valve body 42, needle-valve back-moving spring 43, needle-valve stop collar 44 and control slide block 46.Control slide block 46 is placed in control
In chamber processed 45, meter in hole 48, control slide block through hole 40 and bleed off circuit 39 are machined with.Meter in hole 48 and needle-valve are spacing
Fuel feed hole 47 on set 44 is connected.Needle-valve body 42 is arranged in needle seating 9, and oil holding slot is set between needle seating 9 and needle-valve body 42
8.Spray orifice 49 is processed on needle seating 9, the surface of needle-valve body 42 sets the ditch 50 of micron level depth.
Fig. 1 is the overall structure diagram of bypass type electric-controlled fuel injector of the present invention.Pressure accumulation chamber 12 is provided with oil injector body 11,
Pressure accumulation chamber 12 is connected with main fuel feed hole 13.Injector head 1 is assembled with oil injector body 11 by threaded line, and sealing ring 2 will
The two is sealed.When the high pressure fuel that conveying is come in enters fuel injector inside by main fuel feed hole 13, pressure accumulation chamber 12 is flowed through
In fuel oil can be down through current limliting valve module 3.Fuel oil flows through descending high-pressure oil passage 4 and enters control from after the outflow of current limliting valve module 3
Chamber processed 45 and oil holding slot 8.Electromagnetic valve component 5 and needle-valve group are equipped with successively between the lower section of current limliting valve module 3 and the top of needle seating 9
Part 6.In electromagnetic valve component 5, armature 30 is controlled by electromagnetic force and lifting and taking a seat for valve rod 36 is balanced.When coil 29 is logical
When electric, balance valve rod 36 is lifted up, and spill port 32 is opened, and the intermediate fuel oil of control chamber 45 flows through control slide block through hole 40, middle oil
Road 33 and middle throttle orifice 35, by the draining of spill port 32.Therefore the fuel pressure of control chamber 45 declines, formed with oil holding slot 8 and fired
Oil pressure is poor so that needle-valve body 42 is lifted, fuel injection beginning.During being somebody's turn to do, needle-valve stop collar 44 plays the displacement of limitation needle-valve body 42
Effect.Two sections of presence of throttling of control slide block through hole 40 and middle throttle orifice 35, it is ensured that the internal combustion oil pressure of middle oil circuit 33
Power will not decline rapidly, and this just slow down the decrease speed of the fuel pressure of control chamber 45.When coil 29 is powered off, work as balanced valve
When bar 36 is taken a seat downwards, spill port 32 is closed, and fuel oil can be directly entered control chamber 45 by fuel feed hole 47 and meter in hole 48,
So that control chamber 45 builds pressure, needle-valve body 42 is taken a seat, and injection process terminates.Needle-valve body 42 is arranged on inside needle seating 9, and by needle-valve
Back-moving spring 43 is compressed.Needle seating 9 and electromagnetic valve component 5 are all arranged on inside tight cap 10, and by oil injector body 11 and screw thread
Line is fastened.The internal hydraulic pressure of needle-valve body 42 balance, it is poor without static pressure, realize function of the fuel injector without static leakage.
Fig. 2 is flow-limiting valve components structural representation of the present invention.It is by back-up ring 14, damping spring 15, ball valve 17, support
Control slide block 18, ball valve back-moving spring 23, ball valve return spring holder 24, current limliting piston 25, limit spring seat 27 etc. are constituted.Current limliting
Valve module 3 is arranged on inside oil injector body 11 by pressure accumulation chamber 12.Back-up ring 14 not only serves spacing to overall current limliting valve module 3
Effect, and coordinated with limit spring seat 27, on the one hand as the spring base of damping spring 15, on the other hand limit
Flow the maximum displacement of piston 25.Under the initial tension of spring effect of damping spring 15 and ball valve back-moving spring 23, ball valve 17 is with limit
The upper surface of the lower surface and support and control sliding block 18 of flowing piston 25 coordinates.Ball valve return spring holder 24 is in ball valve back-moving spring 23
Spring-force driven dual under, be pressed in bottom, at its top variable cross-section formed ball valve 17 face of taking a seat.High pressure fuel passes through pressure accumulation
The piston blind hole 26 that chamber 12 enters in current limliting piston 25, then the axial centre that support and control sliding block 18 is entered into by metering hole 16
Through hole 19.The fuel oil flowed out by axial central through hole 19 enters transition oil pocket 21 by resonant through holes 20 and resonance throttle orifice 22.
By setting processing resonant through holes 20 and resonance throttle orifice 22, the amplitude by the fuel pressure wave of holes is reduced.Additionally, plus
There is a sector hole footpath smaller compared with resonant through holes 20 in the resonance throttle orifice 22 of work, therefore restriction effect is stronger, result in from holes stream
The fuel flow rate crossed is different so that the fuel pressure wave of script same-phase generates phase difference, after two bursts of fuel pressure wave superpositions
Cancel out each other, and then cause that pressure oscillation is greatly reduced.Lead to by descending high-pressure oil passage 4 from the fuel oil of the outflow of transition oil pocket 21
Lower section oil circuit.When fuel injector normal work, spray orifice 49 sprays fuel oil so that the fuel pressure in transition oil pocket 21 declines.By
In metering hole 16 to the throttling action of fuel oil so that the fuel pressure in piston blind hole 26 and pressure accumulation chamber 12 in current limliting piston 25
Raise, pressure difference is formed with the fuel pressure of transition oil pocket 21, therefore current limliting piston 25, ball valve 17 and the three of support and control sliding block 18 are whole
Body has carried out certain compensation, but will not cause that ball valve 17 is landed in ball valve to bottom offset, this fuel oil just to fuel injector injection
On return spring holder 24.When oil spout is stopped, as fuel oil flows through metering hole 16, the pressure difference of the upper and lower surface of current limliting piston 25
Can be gradually reduced, in the presence of ball valve back-moving spring 23, current limliting piston 25, ball valve 17 and the three of support and control sliding block 18 are again extensive
Initial position is arrived again.When the continual injection fuel oil of spray orifice 49, the fuel oil quality of outflow exceedes threshold value so that fuel injector occurs
During abnormal operation, the oil pressure of the lower section transition oil pocket 21 of current limliting piston 25 declines rapidly, forms upper and lower pressure difference, causes current limliting
Piston 25 compresses ball valve 17 and is landed on ball valve return spring holder 24, prevents fuel oil to continue to circulate.Due to having cut off fuel oil confession
Give, fuel injector is stopped, the occurrence of this just reduces abnormal injection to a certain extent, improve fuel economy and spray
The stability of oily device work.
Fig. 3 is electromagnetic valve component part-structure schematic diagram of the present invention.It is by magnetic valve return spring holder 28, coil 29, rank
Iron 30, valve seat 31, intermediate mass 34, balance valve rod 36, electromagnet 37, magnetic valve back-moving spring 38 etc. are constituted.Magnetic valve reset bullet
Spring abutment 28, magnetic valve back-moving spring 38, coil 29 and electromagnet 37 are built in inside oil injector body 11, wherein magnetic valve reset bullet
Spring abutment 28 is by screw threads for fastening in magnetic valve top.Magnetic valve back-moving spring 38 is in magnetic valve return spring holder 28 and armature 30
Therebetween, armature 30 and balance valve rod 36 are set inside the valve seat 31 of the lower section of oil injector body 11.Intermediate mass 34 is in
The lower section of valve seat 31.When fuel injector commencement of fuel injection, the coil 29 of magnetic valve is powered, and forming magnetic with electromagnet 37 and armature 30 returns
Road, produces electromagnetic force, attracts balance valve rod 36 to move upwards, and the spill port 32 in intermediate mass 34 is opened.At this moment, control chamber
Fuel oil in 45 passes through middle oil circuit 33, middle throttle orifice 35 and the oil return of spill port 32 to fuel tank, and oil pressure declines in control chamber 45,
The upper surface of needle-valve body 42 is pressurized and reduces, and the fuel pressure with oil holding slot 8 forms pressure difference.Needle-valve body 42 is lifted up, and spray orifice 49 is opened
Open, commencement of fuel injection.When fuel injector stops oil spout, because armature 30 and balance valve rod 36 are closely as one, therefore they are common
Moved downward with the initial tension of spring effect by magnetic valve back-moving spring 38, and be pressed on the upper surface of intermediate mass 34, and
Spill port 32 is blocked.At the same time, fuel feed hole 47 in control slide block 46, the oil-feed of meter in hole 48.
Fig. 4 is needle valve assembly part-structure schematic diagram of the present invention.It is by control slide block back-moving spring 41, needle-valve body 42, pin
Valve back-moving spring 43, needle-valve stop collar 44 and control slide block 46 etc. are constituted.Control slide block 46 is placed with control chamber 45, control is slided
Block reset spring 41 is by the jack-up of control slide block 46 and abuts against the lower surface of intermediate mass 34.Bypass oil is machined with control slide block 46
Road 39, control slide block through hole 40 and meter in hole 48.When fuel injection beginning, middle throttle orifice 35 and control on intermediate mass 34
Under two sections of throttling actions of slider throughbores processed 40, the fuel pressure more normal fuel injector of decline in control chamber 45 is slower, subtracts
The discharge of nitrogen oxides is lacked.When end of injection, because the upper surface fuel pressure of control slide block 46 is higher than lower surface, control is slided
Block 46 overcomes the initial tension of spring of control slide block back-moving spring 41 to bottom offset, and bleed off circuit 39 is opened, the combustion in control chamber 45
The rapid foundation of oil pressure, improves needle-valve and takes a seat response.As fuel oil enters control chamber 45, the upper and lower end face of control slide block 46
Pressure difference can be less and less.Control slide block 46 is controlled the active force of sliding block back-moving spring 41, returns to initial position.
Fig. 5 is the section A-A enlarged drawing of needle-valve body 42.Its arcwall face can be very good to play guide effect.
Fig. 6 is nozzle segment structural representation.It is made up of spray orifice 49 and ditch 50.It is close in the motion process of needle-valve body 42
The envelope conical surface is opened, and fuel oil flows to spray orifice 49 from oil holding slot 8 by sealing cone, ditch 50.Ditch 50 changes the flow direction of fuel oil
And velocity magnitude, and then the flow direction and velocity magnitude of spray orifice porch are have adjusted, and the valid circulation area of spray orifice 49 is increased, reduce
The nascent degree in hole, stabilizes the flowing of spray orifice 49 inner cavity, slow down the fluctuation of distributive value, reduces cavitation pitting journey in hole
Degree.
From the above-mentioned course of work, in the injection process of bypass type electric-controlled fuel injector of the present invention, in control chamber 45
The control slide block through hole 40 and bleed off circuit 39 of processing, Initial Injection Rate is relatively low and end of injection can fast quick-break to realize injection
Oil the characteristics of.Oil injector body 11 built with current limliting valve module 3, effectively prevent persistently carrying out for abnormal injection state.
Additionally, the addition of resonance structure effectively reduces fuel pressure fluctuation, it is ensured that the stability and fuel economy of the course of work.
Whole injection process uses solenoid valve control, using motion of the electromagnetic force with acting balancing valve bar, realizes and injection process is responded
Speed is fast, and control accuracy is high, the requirement of variable fuel injection characteristic.The ditch 50 that the surface of needle-valve body 42 is set, effectively improves hole
The stability of flowing, reduces fuel injector cavitation pitting degree.The present invention is applied to when on common rail system, in big oil mass spray regime
Under, using the structure in pressure accumulation chamber 12 can effectively reduce common rail pressure fluctuate, so as to reduce each cylinder injection process uniformity and
Stability declines the generation of phenomenon.
Claims (9)
1. a kind of resonance bypass type electric-controlled fuel injector with ditch, it is characterized in that：Including injector head, oil injector body, current limliting
Valve module, electromagnetic valve component, needle valve assembly, nozzle, needle seating, descending high-pressure oil passage, injector head are arranged on oil injector body
Side, injector head inside sets main fuel feed hole, and oil injector body inside sets pressure accumulation chamber, and main fuel feed hole is communicated with pressure accumulation chamber, current limliting
Valve module is arranged in pressure accumulation chamber, and electromagnetic valve component, needle valve assembly, needle seating are installed in oil injector body lower end successively, and tight cap is located at
Outside electromagnetic valve component, needle valve assembly, needle seating, mode and oil injector body bottom phase that the upper end of tight cap is connected through a screw thread
Even；
The current limliting valve module includes limit spring seat, current limliting piston, ball valve return spring holder, support and control sliding block, spacing bullet
Spring abutment, current limliting piston, ball valve return spring holder are arranged, are installed between limit spring seat and current limliting piston and damp bullet from top to bottom
Spring, support and control sliding block is arranged in ball valve return spring holder, and ball is set between the upper end of support and control sliding block and current limliting piston
Valve, mounting ball valve back-moving spring between the lower end of support and control sliding block and ball valve return spring holder below, in current limliting piston
Piston blind hole and metering hole are set, axial central through hole is set in support and control sliding block, resonance is set in ball valve return spring holder
Through hole and resonance throttle orifice, set transition oil pocket between ball valve return spring holder and oil injector body below, piston blind hole connects
Logical pressure accumulation chamber and metering hole, metering hole are connected or disconnected with axial central through hole under the control of ball valve, resonant through holes and resonance
Throttle orifice connects axial central through hole and transition oil pocket；
The electromagnetic valve component include electromagnet, coil, armature, balance valve rod, valve seat, intermediate mass, wound around coil on electromagnet,
Electromagnet top sets magnetic valve return spring holder, and electromagnet lower section sets armature, between armature and magnetic valve return spring holder
Magnetic valve back-moving spring is set, and balance valve rod is located in valve seat, and balance valve rod upper end is connected with armature, and intermediate mass is arranged on valve
Seat lower section, sets spill port, middle throttle orifice, middle oil circuit in intermediate mass, middle oil circuit is communicated with middle throttle orifice, spill port
Connect or disconnect with middle throttle orifice and fuel tank under the control of balance valve rod；
The needle valve assembly includes needle-valve stop collar, control slide block, needle-valve body, and control slide block is located in needle-valve stop collar, needle-valve
The upper part of body is located in needle-valve stop collar, and the lower part of needle-valve body is located in needle seating, shape between control slide block and needle-valve body
Into control chamber, control slide block back-moving spring is set, needle-valve body middle part sets bossing, bossing and its top in control chamber
Needle-valve stop collar between needle-valve back-moving spring is set, the upper surface of control slide block sets intermediate cavity, set in control slide block into
Oilhole, control slide block through hole, bleed off circuit, fuel feed hole connect intermediate cavity by meter in hole, and control slide block through hole connects respectively
Logical intermediate cavity and control chamber, bleed off circuit connection control chamber, form oil holding slot between needle-valve body and needle seating；
The nozzle includes spray orifice and ditch, and spray orifice is machined on needle seating, ditch set with the surface of needle-valve bottom long；
Middle oil communication intermediate cavity, descending high-pressure oil passage upper end connection transition oil pocket, through oil injector body, valve seat, intermediate mass,
Needle-valve stop collar, needle seating connection oil holding slot, fuel feed hole connect descending high-pressure oil passage.
2. a kind of resonance bypass type electric-controlled fuel injector with ditch according to claim 1, it is characterized in that：The ditch
It is particularly located between the sealing cone and needle-valve body bottom formed when needle-valve long is taken a seat, the number of ditch is the whole of nozzle hole number
Several times, the depth of ditch is micron order.
3. a kind of resonance bypass type electric-controlled fuel injector with ditch according to claim 1 and 2, it is characterized in that：Spray orifice
During oil spout, the fuel pressure of transition oil pocket declines, and current limliting piston, ball valve, support and control sliding block are overall to bottom offset, and ball valve is not
It is landed on ball valve return spring holder, metering hole is communicated with axial central through hole；When the fuel oil quality of spray orifice outflow exceedes threshold value
When, current limliting piston compresses ball valve and it is seated at ball valve return spring holder, and metering hole disconnects with axial central through hole；Spray orifice stops
Only during oil spout, in the presence of ball valve back-moving spring, current limliting piston, ball valve and support and control sliding block integrally return to initial bit
Put.
4. a kind of resonance bypass type electric-controlled fuel injector with ditch according to claim 1 and 2, it is characterized in that：Coil
During energization, balance valve rod is moved upwards, and spill port and fuel tank are connected state, the fuel oil in control chamber pass through middle oil circuit, in
Between throttle orifice and spill port oil return to fuel tank, needle-valve body is lifted up, and spray orifice opens oil spout；After coil blackout, balance valve rod exists
The effect of magnetic valve back-moving spring is moved downward, and is crushed on intermediate mass upper surface, and spill port disconnects with fuel tank；
When spray orifice stops oil spout, control slide block upper surface fuel pressure is higher than its lower surface, and control slide block overcomes control slide block to answer
The initial tension of spring of position spring is opened to bottom offset, bleed off circuit, and as fuel oil enters control chamber, control slide block is in control slide block
Under the active force of back-moving spring, initial position is returned to.
5. a kind of resonance bypass type electric-controlled fuel injector with ditch according to claim 3, it is characterized in that：Coil electricity
When, balance valve rod is moved upwards, and spill port is connected state with fuel tank, and the fuel oil in control chamber passes through middle oil circuit, middle node
, to fuel tank, needle-valve body is lifted up for discharge orifice and spill port oil return, and spray orifice opens oil spout；After coil blackout, balance valve rod is in electromagnetism
The effect of valve back-moving spring is moved downward, and is crushed on intermediate mass upper surface, and spill port disconnects with fuel tank；
When spray orifice stops oil spout, control slide block upper surface fuel pressure is higher than its lower surface, and control slide block overcomes control slide block to answer
The initial tension of spring of position spring is opened to bottom offset, bleed off circuit, and as fuel oil enters control chamber, control slide block is in control slide block
Under the active force of back-moving spring, initial position is returned to.
6. a kind of resonance bypass type electric-controlled fuel injector with ditch according to claim 1 and 2, it is characterized in that：Resonance
Diameter of the diameter less than its two ends in the middle part of throttle orifice, and less than the diameter of resonant through holes, resonance throttle orifice and resonant through holes axle
To total length it is consistent.
7. a kind of resonance bypass type electric-controlled fuel injector with ditch according to claim 3, it is characterized in that：Resonance throttles
Diameter of the diameter less than its two ends in the middle part of hole, and less than the diameter of resonant through holes, resonance throttle orifice and resonant through holes axial direction
Total length is consistent.
8. a kind of resonance bypass type electric-controlled fuel injector with ditch according to claim 4, it is characterized in that：Resonance throttles
Diameter of the diameter less than its two ends in the middle part of hole, and less than the diameter of resonant through holes, resonance throttle orifice and resonant through holes axial direction
Total length is consistent.
9. a kind of resonance bypass type electric-controlled fuel injector with ditch according to claim 5, it is characterized in that：Resonance throttles
Diameter of the diameter less than its two ends in the middle part of hole, and less than the diameter of resonant through holes, resonance throttle orifice and resonant through holes axial direction
Total length is consistent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710034920.9A CN106762284A (en) | 2017-01-18 | 2017-01-18 | A kind of resonance bypass type electric-controlled fuel injector with ditch |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710034920.9A CN106762284A (en) | 2017-01-18 | 2017-01-18 | A kind of resonance bypass type electric-controlled fuel injector with ditch |
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| FR3017905A1 (en) * | 2014-02-24 | 2015-08-28 | Delphi Int Operations Luxembourg Sarl | FUEL INJECTOR |
| CN104912707A (en) * | 2015-06-23 | 2015-09-16 | 哈尔滨工程大学 | Bivalve-cooperated electromagnetic control oil spray device |
| CN206352537U (en) * | 2017-01-18 | 2017-07-25 | 哈尔滨工程大学 | A kind of resonance bypass type electric-controlled fuel injector with ditch |
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- 2017-01-18 CN CN201710034920.9A patent/CN106762284A/en active Pending
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| CN1651755A (en) * | 2005-02-07 | 2005-08-10 | 大连理工大学 | Fuel injection nozzle |
| US20130220271A1 (en) * | 2010-11-02 | 2013-08-29 | Robert Bosch Gmbh | Device for injecting fuel into the combustion chamber of an internal combustion engine |
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