CN106593725A - Resonance type electronic fuel injector - Google Patents
Resonance type electronic fuel injector Download PDFInfo
- Publication number
- CN106593725A CN106593725A CN201710034994.2A CN201710034994A CN106593725A CN 106593725 A CN106593725 A CN 106593725A CN 201710034994 A CN201710034994 A CN 201710034994A CN 106593725 A CN106593725 A CN 106593725A
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- valve
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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
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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
The invention provides a resonance type electronic fuel injector. The resonance type electronic fuel injector comprises a fuel injector head, a fuel injector body, a flow-limiting valve assembly, an electromagnetic valve assembly, a tight cap, a needle valve limiting sleeve, a nozzle, a needle valve body, and the like. According to the resonance type electronic fuel injector, a pressure storage cavity is arranged in the fuel injector body and communicates with a main fuel inlet and the flow-limiting valve assembly, so that fuel injection processes of all cylinders are guaranteed stable under the condition that large-pulse width fuel injection is guaranteed; the flow-limiting valve assembly is mounted under the pressure storage cavity, so that abnormal continuous fuel injection is avoided; a resonance through hole and a resonance throttle hole are processed in the bottom of the flow-limiting valve assembly, and fluctuation of fuel of the flow-limiting valve assembly is effectively reduced through the superposition principle of waves; and hydraulic pressure in the fuel injector is balanced and free of static pressure difference, so that non static leakage function of the fuel injector is achieved.
Description
Technical field
The present invention relates to a kind of electromotor fueling injection equipment, specifically high-pressure common rail oil injection device.
Background technology
At present, in order to improve fuel economy, common rail fuel combustion system injection pressure is put forward higher requirement.Rail pressure
Increase can cause the fuel oil static leakage problem between common-rail injector couple, and especially after rail pressure is more than 200MPa, static state is let out
Leakage problem substantially, not only loses most of energy, and produced heat is also significantly increased, and makes whole system all there is potential danger
Danger, this in turn limits the further raising of injection pressure.
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, spray the surge pressure fluctuation for causing and directly influence multi-injection reason
Think the realization of fuel injection characteristic, and then affect 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 fluctuation is little, quick response and without quiet
The resonant mode electric-controlled fuel injector of state leakage function.
The object of the present invention is achieved like this：
Resonant mode electric-controlled fuel injector of the present invention, is characterized in that：Including injector head, oil injector body, current limliting valve module, electromagnetism
Valve module, needle valve assembly, descending high-pressure oil passage, injector head are arranged on above oil injector body, arrange master and enter inside injector head
Oilhole, arranges pressure accumulation chamber inside oil injector body, main fuel feed hole is communicated with pressure accumulation chamber, and current limliting valve module is arranged in pressure accumulation chamber, spray
Oily body lower end installs electromagnetic valve component, needle valve assembly successively, and tight cap is located at outside electromagnetic valve component, needle valve assembly, tight cap
The mode that upper end is threaded connection 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 slide block, limit
Position spring base, current limliting piston, ball valve return spring holder are arranged from top to bottom, install and damp between limit spring seat and current limliting piston
Spring, support and control slide block are arranged in ball valve return spring holder, are arranged between the upper end of support and control slide block and current limliting piston
Ball valve, mounting ball valve back-moving spring between the lower end of support and control slide block and ball valve return spring holder below, current limliting piston
In piston blind hole and metering hole are set, axial central through hole is set in support and control slide block, in ball valve return spring holder, arranges humorous
Shake through hole and resonance throttle orifice, and transition oil pocket, piston blind hole are arranged between ball valve return spring holder and oil injector body below
Connection pressure accumulation chamber and metering hole, metering hole under the control of ball valve are connected or are disconnected with axial central through hole, 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 electric magnet, coil, armature, balance valve rod, valve seat, intermediate mass, winds on electric magnet
Coil, arranges electromagnetic valve return spring holder above electric magnet, armature, armature and electromagnetic valve return spring holder are arranged below electric magnet
Between electromagnetic 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 arranged
Below valve seat, spill port, middle oil circuit, lower shape fuel feed hole be set in intermediate mass, spill port under the control of balance valve rod with
Middle oil circuit is connected with fuel tank or is disconnected；
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, above needle-valve body and needle-valve stop collar between shape
Into control chamber, on needle-valve stop collar, arrange raised, it is raised to be located at control chamber, needle-valve reset bullet is set between needle-valve body and projection
Spring, control chamber are communicated with middle oil circuit and lower shape fuel feed hole respectively, and oil holding slot is formed between needle-valve body and nozzle, and nozzle-end sets
Put spray orifice；
The upper end connection transition oil pocket of descending high-pressure oil passage, Jing oil injector bodies, valve seat, intermediate mass, nozzle connection oil holding slot,
Descending 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, current limliting piston, ball valve, support and control slide 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 that spray orifice flows out
When oil quality exceedes threshold value, current limliting piston compresses ball valve and makes which be 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 slide block are whole
Body returns to initial position.
2nd, during coil electricity, balance valve rod is moved upwards, and spill port is connected state with fuel tank, and the fuel oil for controlling intracavity leads to
In the middle of crossing, to fuel tank, needle-valve body is lifted up for oil circuit and spill port oil return, and spray orifice opens oil spout；After coil blackout, valve rod is balanced
Move downward in the effect of electromagnetic valve back-moving spring, be crushed on intermediate mass upper surface, spill port is disconnected with fuel tank.
3rd, diameter of the diameter in the middle part of resonance throttle orifice less than 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：Pressure accumulation cavity configuration is present invention employs, 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 on present configuration,
The generation of the abnormal conditions such as abnormal injection is effectively prevent, and adds resonance structure, reduced fuel pressure fluctuation, protect
The reliability of fuel economy and fuel injector work is improve while the injection process of card normal table.Present invention employs electricity
Magnet valve control balances valve rod to adjust the switch of oil return circuit, is conducive to improving the response speed and control accuracy of needle-valve, there is provided
Flexible fuel injection characteristic, effectively improves the discharge stability and economy of diesel engine.Nozzle segment internal-internal hydraulic pressure
Balance, it is poor without static pressure, realize function of the fuel injector without static leakage.
Description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is current limliting valve module schematic diagram；
Fig. 3 is electromagnetic valve component schematic diagram；
Fig. 4 is A-A schematic diagrams.
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, resonant mode electric-controlled fuel injector of the present invention includes injector head 1, current limliting valve module 3, electromagnetic valve component
5th, nozzle 7, needle-valve body 8, needle-valve stop collar 11, tight cap 14, oil injector body 15.Injector head 1 is connected by screw thread
On oil injector body 15, and sealed by the sealing ring 2 being placed on oil injector body 15.Arrange in injector head 1
Main fuel feed hole 17, and connect with the pressure accumulation chamber 16 in oil injector body 15.Current limliting valve module 3 is provided with below pressure accumulation chamber 16.Flow-limiting valve
Component 3 is arranged on inside oil injector body 15, and its primary structure includes back-up ring 18, damping spring 19, ball valve 21, support and control and slides
Block 22, ball valve back-moving spring 27, ball valve return spring holder 28, current limliting piston 29, limit spring seat 31.Wherein, metering hole 20 with
And piston blind hole 30 is processed on current limliting piston 29, axial central through hole 23 is processed on support and control slide block 22, is so ensured
Fuel oil can smoothly flow to lower section oil circuit.Wherein 27 bottom of ball valve return spring holder is machined with two resonance holes, respectively humorous
Shake through hole 24 and resonance throttle orifice 26.Electromagnetic valve component 5, nozzle 7 and needle-valve body 8, three are sequentially provided with below oil injector body 15
Assembly connection is carried out by tight cap 14.5 primary structure of electromagnetic valve component includes electromagnetic valve return spring holder 32, coil 33, rank
Ferrum 34, valve seat 35, intermediate mass 39, balance valve rod 40, electric magnet 41, electromagnetic valve back-moving spring 42.Armature 34 and balance valve rod 40
Combination is inside valve seat 35.Spill port 36, descending fuel feed hole 37, middle oil circuit 38 etc. are processed inside intermediate mass 39, in
Between block 39 form control chamber 13 with needle-valve stop collar 11 and needle-valve body 8.Needle chamber is formed between needle-valve stop collar 11 and nozzle 7
12.Needle-valve body 8 is arranged in nozzle 7, and 8 upper end of needle-valve body for being cased with needle-valve back-moving spring 6 is arranged in needle chamber 12, needle-valve
Oil holding slot 10 is set between body 8 and nozzle 7.
Fig. 1 is the overall structure diagram of resonant mode electric-controlled fuel injector of the present invention, and it is by injector head 1, sealing ring 2, limit
Stream valve module 3, electromagnetic valve component 5, nozzle 7, needle-valve body 8, needle-valve stop collar 11, tight cap 14, oil injector body 15,16 groups of pressure accumulation chamber
Into.Pressure accumulation chamber 16 is provided with oil injector body 15, pressure accumulation chamber 16 is connected with the main fuel feed hole 17 on injector head 1.Current limliting piston
In 29, oil pocket passes sequentially through piston blind hole 30 and the metering hole 20 that is opened in thereon is connected with pressure accumulation chamber 16.Injector head 1 and spray
Oily body 15 is assembled by threaded line, and the two is sealed by sealing ring 2.When the high pressure fuel that conveying is come in is entered by master
When oilhole 17 is entered inside fuel injector, can be down through current limliting valve module 3 by the fuel oil in pressure accumulation chamber 16.Fuel oil is from flow-limiting valve
Component 3 flows through descending high-pressure oil passage 4 into control chamber 13 and oil holding slot 10 after flowing out.Below current limliting valve module 3 and above nozzle 7
Between be equipped with electromagnetic valve component 5.In electromagnetic valve component 5, the lift of armature 34 and balance valve rod 40 is controlled by electromagnetic force
Rise and take a seat.When coil 33 is powered, balance valve rod 40 is lifted up, and spill port 36 is opened, during 13 intermediate fuel oil of control chamber is flowed through
Between oil circuit 38, by 36 draining of spill port.Therefore 13 fuel pressure of control chamber declines, fuel oil pressure reduction is formed with oil holding slot 10, made
Obtain needle-valve body 8 to lift, fuel injection beginning.During being somebody's turn to do, needle-valve stop collar 11 plays a part of the displacement for limiting needle-valve body 8.Coil
During 33 power-off, when balance valve rod 40 is taken a seat downwards, spill port 36 is closed, and fuel oil directly enters into control by descending fuel feed hole 37
Chamber 13.Needle-valve body 8 is arranged on inside nozzle 7, and is compressed by needle-valve back-moving spring 6.Nozzle 7 and electromagnetic valve component 5 are all arranged on
Inside tight cap 14, and fastened by oil injector body 15 and threaded line.Fuel injector internal hydraulic pressure balance, realization poor without static pressure
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 18, damping spring 19, ball valve 21, support
Control slide block 22, ball valve return spring holder 28, current limliting piston 29, limit spring seat 31 etc. are constituted.Current limliting valve module 3 passes through pressure accumulation
Chamber 16 is arranged on inside oil injector body 15.Back-up ring 18 not only serves position-limiting action to overall current limliting valve module 3, and with it is spacing
Spring base 31 is coordinated, and on the one hand as the spring base of damping spring 19, on the other hand limits the maximum of current limliting piston 29
Displacement.Under the initial tension of spring effect of damping spring 19 and ball valve back-moving spring 27, lower end of the ball valve 21 with current limliting piston 29
The upper surface of face and support and control slide block 22 coordinates.Spring-force driven dual of the ball valve return spring holder 28 in ball valve back-moving spring 27
Under, bottom is pressed in, the face of taking a seat of ball valve 21 at its top variable cross-section, is formed.High pressure fuel enters current limliting by pressure accumulation chamber 16
Piston blind hole 30 in piston 29, flows through the axial central through hole 23 that metering hole 20 enters into support and control slide block 22.By axial direction
The fuel oil that central through hole 23 flows out enters transition oil pocket 25 through resonant through holes 24 and resonance throttle orifice 26.It is humorous by arranging processing
Shake through hole 24 and resonance throttle orifice 26, reduces the amplitude of the fuel pressure wave by holes.Additionally, the resonance throttle orifice of processing
There is a sector hole footpath less compared with resonant through holes 24 in 26, therefore restriction effect is stronger, result in the fuel flow rate flow through from holes not
Together so that synchronous fuel pressure wave generates phase contrast originally, cancels out each other, and then press after two bursts of fuel pressure wave superpositions
Fluctuation is greatly reduced.The fuel oil flowed out from transition oil pocket 25 leads to lower section oil circuit through descending high-pressure oil passage 4.When fuel injector just
When often working, spray orifice 9 sprays fuel oil so that the fuel pressure in transition oil pocket 25 declines.Due to section of the metering hole 20 to fuel oil
Stream is acted on so that the fuel pressure in the piston blind hole 30 and pressure accumulation chamber 16 in current limliting piston 29 is raised, in transition oil pocket 25
Fuel pressure forms pressure reduction, therefore current limliting piston 29, ball valve 21 and 22 three of support and control slide block are overall to bottom offset, and this is just to spray
The fuel oil of oily device injection has carried out certain compensation, but ball valve 21 will not be caused to be landed on ball valve return spring holder 27.Work as spray
When oil quits work, as fuel oil flows through metering hole 20, the pressure reduction of 29 upper and lower surface of current limliting piston can be gradually reduced, multiple in ball valve
In the presence of the spring 27 of position, current limliting piston 29, ball valve 21 and 22 three of support and control slide block return to initial position again.Work as spray orifice
9 continual injection fuel oils, the fuel oil quality of outflow exceed threshold value so that when abnormal operation occurs in fuel injector, current limliting
The oil pressure of the lower section transition oil pocket 25 of piston 29 declines rapidly, forms upper and lower pressure reduction, causes current limliting piston 29 to compress ball valve 21 and falls
Seat prevents fuel oil to continue circulation on ball valve return spring holder 28.Due to having cut off fuel delivery, fuel injector quits work,
The occurrence of this just reduces abnormal injection to a certain extent, improves the stability of fuel economy and fuel injector work.
Fig. 3 is electromagnetic valve component part-structure schematic diagram of the present invention.It is by electromagnetic valve return spring holder 32, coil 33, rank
Ferrum 34, valve seat 35, intermediate mass 39, balance valve rod 40, electric magnet 41, electromagnetic valve back-moving spring 42 etc. are constituted.Electromagnetic valve reset bullet
Spring abutment 32, coil 33, electric magnet 41 and electromagnetic valve back-moving spring 42 are built in oil injector body 15, wherein electromagnetic valve back-moving spring
Seat 32 is by screw threads for fastening in electromagnetic valve top.Electromagnetic valve back-moving spring 42 is in electromagnetic valve return spring holder 32 and armature 34 2
Between person, armature 34 and balance valve rod 40 are set inside the valve seat 35 below oil injector body 15.Intermediate mass 39 is in valve
Below seat 35.When fuel injector commencement of fuel injection, coil 33 is powered, and forms magnetic loop with armature 34 and electric magnet 41, produces electromagnetism
Power, attracts to move on balance valve rod 40, and the spill port 36 in intermediate mass 39 is opened.At this moment, the fuel oil in control chamber 13 is successively
By middle oil circuit 38 and 36 oil return of spill port to fuel tank, 13 fuel pressure of control chamber declines, and 8 upper surface of needle-valve body is pressurized to be subtracted
It is little, pressure reduction is formed with the fuel pressure in oil holding slot 10.Under differential pressure action, needle-valve body 8 is lifted up, and spray orifice 9 opens oil spout.
When fuel injector stops oil spout, 31 power-off of coil, as armature 34 and balance valve rod 40 are closely as one, therefore they are common
Moved downward by the initial tension of spring effect of electromagnetic valve back-moving spring 42, and be pressed on 39 upper surface of intermediate mass, and block up
Spill port 36 is lived.At the same time, pressure is built in 37 oil-feed of descending fuel feed hole inside intermediate mass, control chamber 13, and needle-valve body 8 is taken a seat.
Section A-A enlarged drawings of the Fig. 4 for needle-valve body 8.Its arcwall face can be very good to play guide effect.
From the above-mentioned course of work, in the injection process of resonant mode electric-controlled fuel injector of the present invention, oil injector body 15 is built-in
Some current limliting valve modules 3, effectively avoid persistently carrying out for abnormal injection state.Additionally, the addition of resonance structure effectively subtracts
Little fuel pressure fluctuation, it is ensured that the stability and fuel economy of the course of work.When the present invention is applied on common rail system,
Under big oil mass spray regime, common rail pressure fluctuation can be effectively reduced using 16 structure of pressure accumulation chamber, so as to reduce each cylinder oil spout
The uniformity of process and stability decline the generation of phenomenon.
Claims (5)
1. resonant mode electric-controlled fuel injector, 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 above oil injector body, and main fuel feed hole is arranged inside injector head, are sprayed
Pressure accumulation chamber is set inside oily body, and main fuel feed hole is communicated with pressure accumulation chamber, and current limliting valve module is arranged in pressure accumulation chamber, under oil injector body
End installs electromagnetic valve component, needle valve assembly successively, and tight cap is located at outside electromagnetic valve component, needle valve assembly, and the upper end of tight cap passes through
The mode of threaded connection 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 slide block, spacing bullet
Spring abutment, current limliting piston, ball valve return spring holder are arranged from top to bottom, install and damp bullet between limit spring seat and current limliting piston
Spring, support and control slide block are arranged in ball valve return spring holder, arrange ball between the upper end of support and control slide block and current limliting piston
Valve, mounting ball valve back-moving spring between the lower end of support and control slide block and ball valve return spring holder below, in current limliting piston
Piston blind hole and metering hole are set, axial central through hole are set in support and control slide block, resonance is set in ball valve return spring holder
Through hole and resonance throttle orifice, arrange 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 under the control of ball valve are connected or are disconnected with axial central through hole, resonant through holes and resonance
Throttle orifice connects axial central through hole and transition oil pocket；
The electromagnetic valve component include electric magnet, coil, armature, balance valve rod, valve seat, intermediate mass, wound around coil on electric magnet,
Electromagnetic valve return spring holder is set above electric magnet, armature is set below electric magnet, between armature and electromagnetic valve return spring holder
Electromagnetic 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, arranges spill port, middle oil circuit, lower shape fuel feed hole in intermediate mass, spill port under the control of balance valve rod with centre
Oil circuit is connected with fuel tank or is disconnected；
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 in needle-valve stop collar, the lower part of needle-valve body is located in nozzle, is formed and control above needle-valve body and needle-valve stop collar between
Chamber processed, arranges raised on needle-valve stop collar, raised to be located at control chamber, and needle-valve back-moving spring is arranged between needle-valve body and projection,
Control chamber is communicated with middle oil circuit and lower shape fuel feed hole respectively, and oil holding slot is formed between needle-valve body and nozzle, and nozzle-end is arranged
Spray orifice；
The upper end connection transition oil pocket of descending high-pressure oil passage, Jing oil injector bodies, valve seat, intermediate mass, nozzle connection oil holding slot are descending
Fuel feed hole connects descending high-pressure oil passage.
2. resonant mode electric-controlled fuel injector according to claim 1, is characterized in that：During spray orifice oil spout, the fuel oil of transition oil pocket
Pressure drop, current limliting piston, ball valve, support and control slide block are overall to bottom offset, and ball valve is not landed in ball valve return spring holder
On, metering hole is communicated with axial central through hole；When the fuel oil quality that spray orifice flows out exceedes threshold value, current limliting piston compresses ball valve simultaneously
Which is made to be seated at ball valve return spring holder, metering hole is disconnected with axial central through hole；When spray orifice stops oil spout, in ball valve reset bullet
In the presence of spring, current limliting piston, ball valve and support and control slide block integrally return to initial position.
3. resonant mode electric-controlled fuel injector according to claim 1 and 2, is characterized in that：During coil electricity, balance valve rod is upwards
Motion, spill port are connected state with fuel tank, and the fuel oil for controlling intracavity passes through middle oil circuit 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 is moved downward in the effect of electromagnetic valve back-moving spring, quilt
It is pressed on intermediate mass upper surface, spill port is disconnected with fuel tank.
4. resonant mode electric-controlled fuel injector according to claim 1 and 2, is characterized in that：Diameter in the middle part of resonance throttle orifice is little
In the diameter at its two ends, and less than the diameter of resonant through holes, resonance throttle orifice is consistent with the total length of resonant through holes axial direction.
5. resonant mode electric-controlled fuel injector according to claim 3, is characterized in that：Diameter in the middle part of resonance throttle orifice is less than which
The diameter at two ends, and less than the diameter of resonant through holes, resonance throttle orifice is consistent with the total length of resonant through holes axial direction.
Priority Applications (1)
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