CN106762285A - A kind of On Fluctuations oil return resonant mode electric-controlled fuel injector - Google Patents
A kind of On Fluctuations oil return resonant mode electric-controlled fuel injector Download PDFInfo
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- CN106762285A CN106762285A CN201710034961.8A CN201710034961A CN106762285A CN 106762285 A CN106762285 A CN 106762285A CN 201710034961 A CN201710034961 A CN 201710034961A CN 106762285 A CN106762285 A CN 106762285A
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- valve
- oil
- needle
- fuel
- current limliting
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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
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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
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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
- F02M63/0033—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
- F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
- F02M63/0036—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat with spherical or partly spherical shaped valve member ends
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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
- F02M63/007—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 On Fluctuations oil return resonant mode electric-controlled fuel injector, including injector head, oil injector body, current limliting valve module, electromagnetic valve component, needle-valve stop collar, needle-valve body.Pressure accumulation chamber is provided with oil injector body, is connected with current limliting valve module with main fuel feed hole, it is ensured that under the conditions of big distributive value, the stabilization of each cylinder injection process.Current limliting valve module is placed on pressure accumulation chamber lower section, prevents persistently carrying out for abnormal oil spout.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 reduced using the principle of stacking of ripple.Oil injector body bottom processing electromagnetic valve component drives stem movement by electromagnetic force, can realize flexible Injection strategy and the injection process that response is fast, control accuracy is high.Two-position three-way valve form magnetic valve causes that dynamic recirculating oil quantity is greatly reduced, and realizes On Fluctuations oil return function.It is poor without static pressure inside fuel injector, it is ensured that the characteristics of fuel injector is without static leakage, improve system hydraulic efficiency.
Description
Technical field
The present invention relates to a kind of engine fueling injection equipment.
Background technology
The characteristics of high speed electromagnetic valve type fuel injector is protruded is the fuel injection characteristic that complexity is realized by microcontroller, so that
Meet the requirement of increasingly strict Abgasgesetz.Using the fuel injector of high-speed electromagnetic valve, its faster system response, control accuracy is high,
With flexible control strategy and reliable service behaviour.But this electric-controlled fuel injector there is also shortcoming：Fuel injector is generally adopted
With the form of 2/2-way valve, fuel injector dynamic recirculating oil quantity is larger, influences fuel utilization ratio；The presence of plunger is controlled to cause oil spout
There is static leakage fuel oil in device；Fuel injector inner needle valve opens and closes the surge pressure wave that can cause, and reduces injection process
Stability, is also easy to cause common rail pressure to fluctuate during big oil mass is sprayed, and reduces the uniformity of each cylinder injection process.
The content of the invention
It is small it is an object of the invention to provide fuel pressure fluctuation, can realize without static leakage and On Fluctuations oil return function
A kind of On Fluctuations oil return resonant mode electric-controlled fuel injector.
The object of the present invention is achieved like this：
A kind of On Fluctuations oil return resonant mode electric-controlled fuel injector of the present invention, it is characterized in that：Including injector head, oil injector body,
Current limliting valve module, electromagnetic valve component, needle valve assembly, descending high-pressure oil passage, injector head are arranged on oil injector body top, fuel injector
Head is internal to set main fuel feed hole, and oil injector body inside sets pressure accumulation chamber, and main fuel feed hole is communicated with pressure accumulation chamber, and current limliting valve module is set
In pressure accumulation chamber, electromagnetic valve component, needle valve assembly are installed in oil injector body lower end successively, and tight cap is located at electromagnetic valve component, needle-valve group
Outside part, the mode that the upper end of tight cap is connected through a screw thread is connected with oil injector body bottom；
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, and ball valve is set between the upper end of support slipper and current limliting piston,
Mounting ball valve back-moving spring between the lower end of support slipper and ball valve return spring holder below, piston is set in current limliting piston
Blind hole and metering hole, set axial central through hole in support slipper, resonant through holes and resonant section are set in ball valve return spring holder
Discharge orifice, sets transition oil pocket, piston blind hole connection pressure accumulation chamber and limit between ball valve return spring holder and oil injector body below
Discharge orifice, metering hole is connected or disconnected with axial central through hole under the control of ball valve, and resonant through holes are connected with resonance throttle orifice
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
Below valve seat, balance and formed between the middle part of valve rod and valve seat balance valve rod epicoele, balance the bottom of valve rod, valve seat and
Balance valve rod cavity of resorption is formed between intermediate mass, up fuel feed hole is set in valve seat, spill port, middle oil duct are set in intermediate mass,
Up fuel feed hole connection balance valve rod epicoele, middle oil duct connection balance valve rod cavity of resorption, spill port is under the control of balance valve rod
Connect or disconnect with middle oil duct and fuel tank；
The needle valve assembly includes needle-valve stop collar, nozzle, needle-valve body, and needle-valve stop collar is located in nozzle, needle-valve body
Upper part is located in needle-valve stop collar, and the lower part of needle-valve body is located in nozzle, shape between needle-valve body top and needle-valve stop collar
Set raised into control chamber, on needle-valve stop collar, projection is located at control chamber, needle-valve reset bullet is set between needle-valve body and projection
Spring, control chamber is communicated with middle oil duct, and oil holding slot is formed between needle-valve body and nozzle, and nozzle-end sets spray orifice；
The upper end connection transition oil pocket of descending high-pressure oil passage, through oil injector body, valve seat, intermediate mass, nozzle connection oil holding slot,
Up fuel feed hole connects descending high-pressure oil passage.
The present invention can also include：
1st, during spray orifice oil spout, the fuel pressure of transition oil pocket declines, and current limliting piston, ball valve, support slipper are overall to bottom
Move, and ball valve is not landed on ball valve return spring holder, metering hole is communicated with axial central through hole；When the fuel oil matter of spray orifice outflow
When amount exceedes threshold value, current limliting piston compresses ball valve and it is seated at ball valve return spring holder, metering hole and axial central through hole
Disconnect；When spray orifice stops oil spout, in the presence of ball valve back-moving spring, current limliting piston, ball valve and support slipper are integrally returned to
Initial position.
2nd, during coil electricity, balance valve rod is moved upwards, and balance valve rod epicoele is off-state with balance valve rod cavity of resorption, is returned
Oilhole is connected state with fuel tank, and the fuel oil in control chamber passes through middle oil duct and spill port oil return to fuel tank, and needle-valve body is upward
Lift, spray orifice opens oil spout；After coil blackout, balance valve rod is moved downward in the effect of magnetic valve back-moving spring, in being crushed on
Between on block upper surface, balance valve rod epicoele connect with balance valve rod cavity of resorption, spill port and fuel tank disconnection, while descending high-pressure oil passage
In fuel oil enter control chamber through up fuel feed hole, balance valve rod epicoele, balance valve rod cavity of resorption, middle oil duct.
3rd, 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, under conditions of big distributive value, it is ensured that fuel injector
Persistently being taken place without for injection process common rail fuel pressure is caused larger fluctuation and cause other fuel injector injection processes to be received
To influence.The present invention uses current limliting valve module, effectively reduces the generation of abnormal injection situation, it is ensured that the oil spout of normal table
Process.Meanwhile, resonance structure is added in current limliting valve module, fuel pressure fluctuation is reduced, improve the stability of injection process.
Fuel injector balances valve rod to adjust the switch of oil return circuit using solenoid valve control, improves control accuracy and flexibility ratio, effectively
Improve the discharge of whole diesel engine, and improve the economy of fuel oil.The balance valve rod of fuel injector is using two-bit triplet
Form, is capable of achieving the two-way sealing of the conical surface, plane, reduces dynamic recirculating oil quantity.And it is poor without static pressure inside fuel injector, it is ensured that
Fuel injector can realize the function of static No 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 A-A schematic diagrames.
Specific embodiment
Illustrate below in conjunction with the accompanying drawings and the present invention is described in more detail：
With reference to Fig. 1-4, a kind of On Fluctuations oil return resonant mode electric-controlled fuel injector primary structure of the invention include injector head 1,
Oil injector body 14, current limliting valve module 3, electromagnetic valve component 13, tight cap 5, needle-valve stop collar 11, nozzle 7, needle-valve body 8.Injector head
1 is connected with oil injector body 14 by screw thread, and is sealed with the sealing ring 15 being placed on oil injector body 14.Spray
Main fuel feed hole 16 on oily device first 1 is connected with the pressure accumulation chamber 2 in oil injector body 14.The lower section of oil injector body 14 is electromagnetic valve component
13rd, nozzle 7 and needle-valve body 8, three pass through the assembly connection of tight cap 5.Current limliting valve module 3 is placed on inside oil injector body 14, its knot
Structure mainly includes that back-up ring 17, limit spring seat 30, damping spring 18, current limliting piston 19, ball valve 28, support slipper 21, ball valve are multiple
Position spring 22, ball valve return spring holder 26.Metering hole 20 and piston blind hole 29, support slipper 21 are machined on current limliting piston 19
It is machined with axial central through hole 27, it is ensured that fuel oil can lead to lower section oil circuit.The bottom of ball valve return spring holder 22 be machined with two it is humorous
Shake hole, respectively resonance throttle orifice 25 and resonant through holes 23.Electricity is provided between the bottom of oil injector body 14 and the top of nozzle 7
Electromagnetic valve component 13, primary structure includes magnetic valve back-moving spring 31, magnetic valve return spring holder 41, coil 32, electromagnet 40, rank
Iron 39, valve seat 33, intermediate mass 37, balance valve rod 38.Armature 39 and the balance combination of valve rod 38 are placed in valve seat 33, and in valve seat
The up fuel feed hole 34 of processing in 33.Spill port 35, middle oil duct 36 etc. are machined with intermediate mass 37, and with the He of needle-valve stop collar 11
Needle-valve body 8 forms control chamber 6.
Fig. 1 is the overall structure diagram of fuel injector of the present invention.Main fuel feed hole 16 is machined with injector head 1, by height
The high pressure fuel of pressuring oil pipe conveying is entered inside fuel injector by main fuel feed hole 16.Injector head 1 passes through spiral shell with oil injector body 14
Streakline is assembled, and has sealing ring 15 to be sealed between the two.Main fuel feed hole 16 is connected with pressure accumulation chamber 2.In pressure accumulation chamber 2
Fuel oil can be down through current limliting valve module 3.Fuel oil enters control from after the outflow of current limliting valve module 3 by descending high-pressure oil passage 4
Chamber 6 and oil holding slot 10.Electromagnetic valve component 13 is equipped between the bottom of oil injector body 14 and nozzle 7.Utilized in electromagnetic valve component 13
Electromagnetic force controls armature 39 and balances lifting and taking a seat for valve rod 38.When being lifted up of valve rod 38 of balance, spill port 35 is opened
Open, the fuel oil of control chamber 6 flows through middle oil duct 36, by the venting of spill port 35.The fuel pressure of control chamber 6 declines, same to oil holding slot
10 form fuel oil pressure difference so that needle-valve body 8 is lifted, fuel injection beginning.The displacement of needle-valve body 8 is wherein limited by needle-valve stop collar 11.
When balance valve rod 38 downwards take a seat when, spill port 35 is closed, fuel oil can by up fuel feed hole 34, flow through balance valve rod 38 and in
Between oil duct 36 enter control chamber 6.The needle-valve body 8 compressed by needle-valve back-moving spring 12 is placed with nozzle 7.If Fig. 4 is needle-valve
The section A-A enlarged drawing of body 8.The arcwall face of needle-valve body 8 can be very good to play guide effect.Without static pressure inside nozzle 7
Difference, it is ensured that the characteristic without static leakage of fuel injector.Nozzle 7 and electromagnetic valve component 13 are both placed in tight cap 5, then by screw thread
Line and oil injector body 14 are fastened.
Fig. 2 is flow-limiting valve components structural representation of the present invention.Current limliting valve module 3 mainly includes back-up ring 17, spacing bullet
Spring abutment 30, damping spring 18, current limliting piston 19, ball valve 28, support slipper 21, ball valve back-moving spring 22, ball valve return spring holder
26 etc..Whole current limliting valve module 3 is placed in inside oil injector body 14 by pressure accumulation chamber 2, and it is carried out by back-up ring 17 spacing.Limit
Position spring base 30 and back-up ring 17 coordinate, on the one hand as the spring base of damping spring 18, on the other hand to current limliting piston 19 most
Big displacement plays restriction effect.The initial tension of spring of spring dampened 18 and ball valve back-moving spring 22, ball valve 28 is with current limliting piston
19 lower surface and the upper surface of support slipper 21 coordinate.Ball valve return spring holder 26 receives the spring force of ball valve back-moving spring 22,
Bottom is pressed in, is the face of taking a seat of ball valve 28 at its top variable cross-section.The work that fuel oil is entered in current limliting piston 19 by pressure accumulation chamber 2
Plug blind hole 29, then enter the axial central through hole 27 of support slipper 21 by metering hole 20.Flowed out by axial central through hole 27
Fuel oil enters transition oil pocket 24 by resonant through holes 23 and resonance throttle orifice 25.Processing resonant through holes 23 and resonance throttle orifice are set
25 cause by the amplitude reduction of the fuel pressure wave of holes.Due to having a sector hole footpath in resonance throttle orifice 25 compared with resonant through holes 23
Smaller, its restriction effect is stronger, causes the fuel flow rate difference flowed through from holes so that the fuel pressure wave of script same-phase
Phase difference is produced, is cancelled out each other after two bursts of fuel pressure wave superpositions, pressure oscillation further reduces.Descending high-pressure oil passage 4 and mistake
Oil pocket 24 is crossed to be connected and towards lower section oil circuit.When the normal oil spout of fuel injector, spray orifice 9 sprays fuel oil, in transition oil pocket 24
Fuel pressure declines.Because metering hole 20 is to the throttling action of fuel oil, in the piston blind hole 29 and pressure accumulation chamber 2 in current limliting piston 19
Fuel pressure it is larger, with transition oil pocket 24 formed pressure difference so that current limliting piston 19, ball valve 28 and support slipper 21 are to bottom
Move, the fuel oil to fuel injector injection is compensated, but will not cause that ball valve 28 is landed on ball valve return spring holder 26.Oil spout knot
Shu Shi, as fuel oil flows through metering hole 20, current limliting piston about 19 pressure difference be gradually reduced, in the effect of ball valve return spring force
Under, current limliting piston 19, ball valve 28 and support slipper 21 return back to original position.When the continual injection fuel oil of spray orifice 9, the combustion of outflow
Oil quality exceedes threshold value, and when abnormal operation occurs in fuel injector, because the flow of the fuel oil of the injection of spray orifice 9 is big, flow velocity is fast, makes
The oil pressure for obtaining the lower section transition oil pocket 24 of current limliting piston 19 declines rapidly, forms upper and lower pressure difference, causes current limliting piston 19 to compress ball
Valve 28 is landed on ball valve return spring holder 26, prevents fuel flow communication.Due to lacking fuel delivery, fuel injector is stopped, and hinders
Persistently carrying out for abnormal injection is stopped.
Fig. 3 is electromagnetic valve component part-structure schematic diagram of the present invention.Electromagnetic valve component 13 mainly includes magnetic valve reset bullet
Spring abutment 41, magnetic valve back-moving spring 31, coil 32, electromagnet 40, armature 39, balance valve rod 38, valve seat 33, intermediate mass 37.Electricity
Magnet valve return spring holder 41, magnetic valve back-moving spring 31, coil 32 and electromagnet 40 are built in inside oil injector body 14, wherein electricity
Magnet valve return spring holder 41 is by screw threads for fastening in magnetic valve top.It is electricity between magnetic valve return spring holder 41 and armature 39
Magnet valve back-moving spring 31.Armature 39 and balance valve rod 38 are placed on inside the valve seat 33 in the lower section of oil injector body 14.In lower section
The part combined with valve seat 33 is intermediate mass 37.Whole magnetic valve uses the form of two-position three-way valve.When fuel injector starts
During oil spout, the coil 32 of magnetic valve is powered, and magnetic loop is formed with electromagnet 40 and armature 39, produces electromagnetic force, attracts balanced valve
Bar 38 is moved upwards, opens the spill port 35 in intermediate mass 37, and block up fuel feed hole 34.At this moment, the combustion in control chamber 6
By middle oil duct 36 and the oil return of spill port 35 to fuel tank, oil pressure declines oil in control chamber 6, and the upper surface of needle-valve body 8 is pressurized and reduces,
Fuel pressure with oil holding slot 10 forms pressure difference.Needle-valve body 8 is lifted up, and opens the oil spout of spray orifice 9.When fuel injector stops oil spout
When, because armature 39 and balance valve rod 38 are closely as one, thus they are jointly subjected to the bullet of magnetic valve back-moving spring 31
Spring pretightning force and be pressed on intermediate mass 37, and blocked spill port 35.At the same time, balance valve rod 38 is opened by up
Fuel feed hole 34 and middle oil duct 36 lead to the oil circuit of control chamber 6, and control chamber 6 builds pressure, and needle-valve body 8 is taken a seat.
From the above-mentioned course of work, in a kind of injection process of On Fluctuations oil return resonant mode electric-controlled fuel injector of the invention,
The form of two-position three-way valve is employed, dynamic recirculating oil quantity is substantially reduced, On Fluctuations oil return function is realized.Resonance structure makes
Fluctuated with fuel pressure is effectively reduced, improve the stability of injection process.Whole injection process uses solenoid valve control, profit
The motion of balance valve rod 38 is driven with electromagnetic force, is realized to injection process fast response time, control accuracy is high, variable oil spout rule
The requirement of rule.The built-in current limliting valve module 3 of oil injector body 14, prevents persistently carrying out for abnormal injection state, it is ensured that the course of work
Stability.The present invention is applied to when on common rail system, under big oil mass spray regime, can be effectively reduced altogether using pressure accumulation chamber 2
Rail pressure fluctuation, the generation of phenomenon is declined so as to the uniformity and stability that reduce each cylinder injection process.
Claims (5)
1. a kind of On Fluctuations oil return resonant mode electric-controlled fuel injector, it is characterized in that：Including injector head, oil injector body, current limliting valve group
Part, electromagnetic valve component, needle valve assembly, descending high-pressure oil passage, injector head are arranged on oil injector body top, are set inside injector head
Main fuel feed hole is put, oil injector body inside sets pressure accumulation chamber, and main fuel feed hole is communicated with pressure accumulation chamber, and current limliting valve module is arranged on pressure accumulation chamber
In, electromagnetic valve component, needle valve assembly are installed in oil injector body lower end successively, and tight cap is located at outside electromagnetic valve component, needle valve assembly, tightly
The mode that the upper end of cap is connected through a screw thread is connected with oil injector body bottom；
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 valve is set between the upper end of support slipper and current limliting piston, is propped up
Mounting ball valve back-moving spring between the lower end of sliding block and ball valve return spring holder below is supportted, it is blind that piston is set in current limliting piston
Hole and metering hole, set axial central through hole in support slipper, resonant through holes and resonance throttling are set in ball valve return spring holder
Hole, sets transition oil pocket, piston blind hole connection pressure accumulation chamber and current limliting between ball valve return spring holder and oil injector body below
Hole, metering hole is connected or disconnected with axial central through hole under the control of ball valve, resonant through holes and the equal connection shaft of resonance throttle orifice
To 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, balances and formed between the middle part of valve rod and valve seat balance valve rod epicoele, balances bottom, valve seat and the centre of valve rod
Balance valve rod cavity of resorption is formed between block, up fuel feed hole is set in valve seat, spill port, middle oil duct are set in intermediate mass, it is up
Fuel feed hole connection balance valve rod epicoele, middle oil duct connection balance valve rod cavity of resorption, spill port is under the control of balance valve rod with
Between oil duct connect or disconnect with fuel tank；
The needle valve assembly includes needle-valve stop collar, nozzle, needle-valve body, and needle-valve stop collar is located in nozzle, the top of needle-valve body
Divide and be located in needle-valve stop collar, the lower part of needle-valve body is located in nozzle, formed between needle-valve body top and needle-valve stop collar and controlled
Chamber processed, sets raised on needle-valve stop collar, projection is located at control chamber, and needle-valve back-moving spring is set between needle-valve body and projection,
Control chamber is communicated with middle oil duct, and oil holding slot is formed between needle-valve body and nozzle, and nozzle-end sets spray orifice；
The upper end connection transition oil pocket of descending high-pressure oil passage, it is up through oil injector body, valve seat, intermediate mass, nozzle connection oil holding slot
Fuel feed hole connects descending high-pressure oil passage.
2. a kind of On Fluctuations oil return resonant mode electric-controlled fuel injector according to claim 1, it is characterized in that：During spray orifice oil spout,
The fuel pressure of transition oil pocket declines, and current limliting piston, ball valve, support slipper are overall to bottom offset, and ball valve is not landed in ball valve
On return spring holder, metering hole is communicated with axial central through hole；When the fuel oil quality of spray orifice outflow exceedes threshold value, current limliting piston
Compress ball valve and it is seated at ball valve return spring holder, metering hole disconnects with axial central through hole；When spray orifice stops oil spout,
In the presence of ball valve back-moving spring, current limliting piston, ball valve and support slipper integrally return to initial position.
3. a kind of On Fluctuations oil return resonant mode electric-controlled fuel injector according to claim 1 and 2, it is characterized in that：Coil electricity
When, balance valve rod is moved upwards, and balance valve rod epicoele is off-state with balance valve rod cavity of resorption, and spill port is connected state with fuel tank
State, the fuel oil in control chamber passes through middle oil duct and spill port oil return to fuel tank, and needle-valve body is lifted up, and spray orifice opens oil spout；
After coil blackout, balance valve rod is moved downward in the effect of magnetic valve back-moving spring, is crushed on intermediate mass upper surface, balanced valve
Bar epicoele is connected with balance valve rod cavity of resorption, and spill port disconnects with fuel tank, while the fuel oil in descending high-pressure oil passage is through up oil-feed
Hole, balance valve rod epicoele, balance valve rod cavity of resorption, middle oil duct enter control chamber.
4. a kind of On Fluctuations oil return resonant mode electric-controlled fuel injector according to claim 1 and 2, 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.
5. a kind of On Fluctuations oil return resonant mode electric-controlled fuel injector according to claim 3, it is characterized in that：In resonance throttle orifice
The diameter in portion is less than the diameter at its two ends, and less than the diameter of resonant through holes, the resonance throttle orifice overall length axial with resonant through holes
Degree is consistent.
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