CN106704066A - Micro-dynamic fuel return bypass type electronically controlled fuel injector - Google Patents
Micro-dynamic fuel return bypass type electronically controlled fuel injector Download PDFInfo
- Publication number
- CN106704066A CN106704066A CN201710046478.1A CN201710046478A CN106704066A CN 106704066 A CN106704066 A CN 106704066A CN 201710046478 A CN201710046478 A CN 201710046478A CN 106704066 A CN106704066 A CN 106704066A
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- Prior art keywords
- valve
- oil
- fuel
- needle
- slide block
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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
- F02M61/1893—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
Abstract
The invention aims to provide a micro-dynamic fuel return bypass type electronically controlled fuel injector. The micro-dynamic fuel return bypass type electronically controlled fuel injector comprises a fuel injector head, a fuel injector body, a flow limiting valve assembly, an electromagnetic valve assembly, a needle valve assembly and a spray nozzle. The flow limiting valve assembly is located inside a pressure storage cavity. It is guaranteed that under the condition of a large fuel injection quantity, the fuel injection process of each cylinder is stable. The electromagnetic valve assembly and the needle valve assembly are arranged on the lower side of the fuel injector body and connected through a fastening cap. An electromagnetic valve is in the form of a two-position three-way valve, so that the dynamic fuel return quantity is reduced, and the micro-dynamic fuel return function is achieved. A control sliding block is arranged in a control cavity and is in contact with a middle block, and the sliding block has the functions of reducing the fuel injection speed in the initial period of injection and accelerating seating and responding of a needle valve. No static pressure difference exists in the fuel injector, and the micro-dynamic fuel return bypass type electronically controlled fuel injector is free of static leakage.
Description
Technical field
The present invention relates to a kind of engine fueling injection equipment.
Background technology
It is the fuel consumption and emission index of Optimization of Diesel Engine, current diesel engine system starts to be switched using high speed electromagnetic
Valve type is controlled, and it has faster system response, and control accuracy is high, excellent with flexible control strategy and reliable service behaviour etc.
Point.But as Abgasgesetz proposes higher, tightened up requirement to fuel injection system, fuel injector needs response speed faster
Degree, lower quantity of fuel leakage and more suitably injection rate.
The limitation of diesel emission essentially consists in two aspects of nitrogen oxides and particulate matter.On the one hand, the shape of nitrogen oxides
The N into mainly due to cylinder2And O2React what is formed at high temperature under high pressure.Thus, the discharge of nitrogen oxides is reduced, just
It is required that being controlled to the instantaneous injection rate of injection process, the injection rate at injection initial stage is reduced.On the other hand, course of injection
At the end of, fuel injector must rapidly the response of taking a seat of oil-break, i.e. needle-valve it is fast, to reduce the forming amount of particulate matter.In sum, bavin
The requirement that oil machine discharges to fuel injector is the injection rate curve that its injection process can form " anxious after first delaying ".
The content of the invention
It is an object of the invention to provide On Fluctuations recirculating oil quantity, with without static leakage function, realizing " anxious after first delaying "
Injection rate time history curve a kind of On Fluctuations oil return bypass type electric-controlled fuel injector.
The object of the present invention is achieved like this：
A kind of On Fluctuations oil return bypass type 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, nozzle, descending high-pressure oil passage, injector head are arranged on oil injector body top,
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 group
Part is arranged in pressure accumulation chamber, and electromagnetic valve component, needle valve assembly, nozzle are installed in oil injector body lower end successively, and tight cap is located at magnetic valve
Component, needle valve assembly, nozzle exterior, the mode that the upper end of tight cap is connected through a screw thread are connected with oil injector body bottom；
The current limliting valve module includes limit spring seat, current limliting piston, ball valve return spring holder, support slipper, 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 slipper is arranged in ball valve return spring holder, and ball valve is set between the upper end of support slipper and current limliting piston, and support is slided
Mounting ball valve back-moving spring between the lower end of block and ball valve return spring holder below, in current limliting piston set piston blind hole and
Metering hole, sets axial central through hole in support slipper, set between ball valve return spring holder and oil injector body below
Oil pocket is crossed, piston blind hole connection pressure accumulation chamber and metering hole, metering hole connect on-off with axial central through hole under the control of ball valve
Open, axial central through hole is connected with 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, oil-feed damping hole is set in valve seat, set in intermediate mass spill port, middle oil duct,
Middle throttle orifice, oil-feed damping hole connection balance valve rod epicoele, middle throttle orifice is respectively communicated with middle oil duct peace weighing apparatus valve rod
Chamber, spill port 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 nozzle, between control slide block and needle-valve body
Formed control chamber, in control chamber set control slide block back-moving spring, needle-valve body middle part set bossing, bossing with thereon
Needle-valve back-moving spring is set between the needle-valve stop collar of side, and the upper surface of control slide block sets intermediate cavity, set in control slide block
Control slide block through hole, bleed off circuit, control slide block through hole are respectively communicated with intermediate cavity and control chamber, and bleed off circuit connects control chamber,
Oil holding slot is formed between needle-valve body and nozzle, nozzle-end sets spray orifice；
Middle oil duct connects intermediate cavity, the upper end connection transition oil pocket of descending high-pressure oil passage, through oil injector body, valve seat, in
Between block, needle-valve stop collar, nozzle connection oil holding slot, oil-feed damping 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, middle 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 is transported downwards in the effect of magnetic valve back-moving spring
It is dynamic, it is crushed on intermediate mass upper surface, balance valve rod epicoele is connected with balance valve rod cavity of resorption, and spill port disconnects with fuel tank, while
Fuel oil in descending high-pressure oil passage enters through oil-feed damping hole, balance valve rod epicoele, balance valve rod cavity of resorption, middle oil duct, intermediate cavity
Enter control chamber.
3rd, 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
The initial tension of spring of sliding block back-moving 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 processed, initial position is returned to.
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.Fuel injector balances valve rod to adjust the switch of oil return circuit using solenoid valve control, improves control accuracy and flexibility ratio,
The discharge of whole diesel engine is effectively improved, and improves the economy of fuel oil.The balance valve rod of fuel injector uses two three
Logical form, is capable of achieving the two-way sealing of the conical surface, plane, reduces dynamic recirculating oil quantity, realizes On Fluctuations oil return function.In control chamber
The bypass oil duct of control slide block can cause the fast run-up pressure of control chamber, improve needle-valve response characteristic.Control slide block throttle orifice is with
Between throttle orifice design ensure that fuel injector in the early stage can slowly oil spout, reduce nitrogen oxides formation.And fuel injector inside nothing
Static pressure is poor, 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 needle valve assembly schematic diagram；
Fig. 5 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. 1-5, a kind of On Fluctuations oil return bypass type electric-controlled fuel injector primary structure of the invention include injector head 1,
Oil injector body 11, current limliting valve module 3, electromagnetic valve component 10, tight cap 9, needle valve assembly 5, nozzle 6.The same oil injector body of injector head 1
11 are connected by screw thread, and are sealed with the sealing ring 12 being placed on oil injector body 11.On injector head 1
Main fuel feed hole 13 is connected with the pressure accumulation chamber 2 in oil injector body 11.The lower section of oil injector body 11 is electromagnetic valve component 10, nozzle 6 and pin
Valve module 5, three passes through the assembly connection of tight cap 9.Current limliting valve module 3 is placed on inside oil injector body 11, and its structure mainly includes
Back-up ring 14, limit spring seat 25, damping spring 15, current limliting piston 16, ball valve 23, support slipper 18, ball valve back-moving spring 19, ball
Valve return spring holder 21.Metering hole 17 and piston blind hole 24 are machined on current limliting piston 16, support slipper 18 is machined with axial direction
Central through hole 22, it is ensured that fuel oil can lead to lower section oil circuit.Electromagnetism is provided between the bottom of oil injector body 11 and the top of nozzle 6
Valve module 10, primary structure includes magnetic valve back-moving spring 26, magnetic valve return spring holder 37, coil 27, electromagnet 36, armature
35th, valve seat 28, intermediate mass 32, balance valve rod 34.Armature 35 and the balance combination of valve rod 34 are placed in valve seat 28, and in valve seat 28
Interior processing oil-feed damping hole 29.Spill port 30, middle oil duct 31, middle throttle orifice 33 etc. are machined with intermediate mass 32.Magnetic valve
The lower section of component 10 is needle valve assembly 5, primary structure include control slide block 44, needle-valve stop collar 42, control slide block back-moving spring 39,
Needle-valve body 40, needle-valve back-moving spring 41.Control slide block 44 is placed in control chamber 43, is machined with control slide block through hole 45 and bypass oil
Road 38.
Fig. 1 is the overall structure diagram of fuel injector of the present invention.Main fuel feed hole 13 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 13.Injector head 1 passes through spiral shell with oil injector body 11
Streakline is assembled, and has sealing ring 12 to be sealed between the two.Main fuel feed hole 13 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 45 and oil holding slot 8.Electromagnetic valve component 10 is equipped between the bottom of oil injector body 11 and needle valve assembly 5.In electromagnetic valve component 10
Armature 35 is controlled using electromagnetic force and balance lifting and taking a seat for valve rod 34.When being lifted up of valve rod 34 of balance, spill port
30 open, and the fuel oil of control chamber 43 flows through control slide block through hole 45, middle oil duct 31 and middle throttle orifice 33, by spill port 30
Venting.The fuel pressure of control chamber 43 declines, and forms fuel oil pressure difference with oil holding slot 8 so that needle-valve body 40 is lifted, fuel injection beginning.This
When, the spacing of needle-valve body 40 is realized by needle-valve stop collar 42.Due to control slide block through hole 45 and middle throttle orifice 33
Two sections of throttling actions, the fuel pressure of middle oil duct 31 will not decline rapidly, so as to slow down the fuel pressure of control chamber 43
Decrease speed.When balance valve rod 34 is taken a seat downwards, spill port 30 is closed, and fuel oil can be flowed through flat by oil-feed damping hole 29
Weighing apparatus valve rod 34, middle throttle orifice 33, middle oil duct 35, control slide block through hole 45 and bypass oil duct 38 enter control chamber 43 so that
Control chamber 43 builds pressure, and needle-valve body 40 is taken a seat, and injection process terminates.Middle oil duct 31 plays connection oil-feed oil circuit and fuel-displaced oil circuit
Effect.Meanwhile, is placed with the needle-valve body 40 compressed by needle-valve back-moving spring 41 in nozzle 6, such as Fig. 5 for needle-valve body 40 section A-
A enlarged drawings.The arcwall face of needle-valve body 40 can be very good to play guide effect.It is poor without static pressure inside whole needle valve assembly 5,
Ensure the characteristic without static leakage of fuel injector.Needle valve assembly 5 and electromagnetic valve component 10 are both placed in tight cap 9, then by spiral shell
Streakline and oil injector body 11 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 14, spacing bullet
Spring abutment 25, damping spring 15, current limliting piston 16, ball valve 23, support slipper 18, ball valve back-moving spring 19, ball valve return spring holder
21 etc..Whole current limliting valve module 3 is placed in inside oil injector body 11 by pressure accumulation chamber 2, and it is carried out by back-up ring 14 spacing.Limit
Position spring base 25 and back-up ring 14 coordinate, on the one hand as the spring base of damping spring 15, on the other hand to current limliting piston 16 most
Big displacement plays restriction effect.The initial tension of spring of spring dampened 15 and ball valve back-moving spring 19, ball valve 23 is with current limliting piston
16 lower surface and the upper surface of support slipper 18 coordinate.Ball valve return spring holder 21 receives the spring force of ball valve back-moving spring 19,
Bottom is pressed in, is the face of taking a seat of ball valve 23 at its top variable cross-section.The work that fuel oil is entered in current limliting piston 16 by pressure accumulation chamber 2
Plug blind hole 24, then enter the axial central through hole 22 of support slipper 18 by metering hole 17.Flowed out by axial central through hole 22
Fuel oil leads to lower section oil circuit by descending high-pressure oil passage 4.When the normal oil spout of fuel injector, spray orifice 7 sprays fuel oil, transition oil pocket 20
Interior fuel pressure declines.Because metering hole 17 is to the throttling action of fuel oil, piston blind hole 24 and pressure accumulation in current limliting piston 16
Fuel pressure in chamber 2 is larger, with transition oil pocket 20 formed pressure difference so that current limliting piston 16, ball valve 23 and support slipper 18 to
Bottom offset, the fuel oil to fuel injector injection is compensated, but will not cause that ball valve 23 is landed on ball valve return spring holder 21.Spray
At the end of oil, as fuel oil flows through metering hole 17, current limliting piston about 16 pressure difference be gradually reduced, in the work of ball valve return spring force
Under, current limliting piston 16, ball valve 23 and support slipper 18 return back to original position.When the continual injection fuel oil of fuel injector, outflow
Fuel oil quality exceed threshold value, when there is abnormal operation in fuel injector, because the flow of the fuel oil of the injection of spray orifice 7 is big, flow velocity
Hurry up so that the oil pressure of the lower section transition oil pocket 20 of current limliting piston 16 declines rapidly, form upper and lower pressure difference, cause current limliting piston 16 to be pressed
Tight ball valve 23 is landed on ball valve return spring holder 21, prevents fuel flow communication.Due to lacking fuel delivery, fuel injector stops work
Make, prevent persistently carrying out for abnormal injection.
Fig. 3 is electromagnetic valve component part-structure schematic diagram of the present invention.Electromagnetic valve component 10 mainly includes magnetic valve reset bullet
Spring 26, magnetic valve return spring holder 37, coil 27, electromagnet 36, armature 35, valve seat 28, intermediate mass 32, balance valve rod 34 etc..
Magnetic valve return spring holder 37, magnetic valve back-moving spring 26, coil 27 and electromagnet 36 are built in inside oil injector body 11, wherein
Magnetic valve return spring holder 37 is by screw threads for fastening in magnetic valve top.It is between magnetic valve return spring holder 37 and armature 35
Magnetic valve back-moving spring 26.Armature 35 and balance valve rod 34 are placed on inside the valve seat 28 in the lower section of oil injector body 11.Under
Side is intermediate mass 32 with the part that valve seat 28 is combined.Whole magnetic valve uses the form of two-position three-way valve.When fuel injector is opened
During beginning oil spout, the coil 27 of magnetic valve is powered, and magnetic loop is formed with electromagnet 36 and armature 35, produces electromagnetic force, attracts balance
Valve rod 34 is moved upwards, opens the spill port 30 in intermediate mass 32, and block oil-feed damping hole 29.At this moment, in control chamber 43
Fuel oil pass through middle oil duct 31, middle throttle orifice 33 and the oil return of spill port 30 to fuel tank, oil pressure declines in control chamber 43, needle-valve
The upper surface of body 40 is pressurized and reduces, and the fuel pressure with oil holding slot 8 forms pressure difference.Needle-valve body 40 is lifted up, and opens spray orifice 7 and sprays
Oil.When fuel injector stops oil spout, because armature 35 and balance valve rod 34 are closely as one, thus they are jointly subjected to electricity
The initial tension of spring of magnet valve back-moving spring 26 and be pressed on intermediate mass 32, and blocked spill port 30.At the same time, balance
Valve rod 34 opens the oil circuit for leading to control chamber 43 by oil-feed damping hole 29, middle throttle orifice 33 and middle oil duct 31.
Fig. 4 is needle valve assembly part-structure schematic diagram of the present invention.Needle valve assembly part mainly includes control slide block 44, control
Sliding block back-moving spring 39, needle-valve stop collar 42, needle-valve body 40 and needle-valve back-moving spring 41.Control slide block 44 is placed on control chamber 43
Inside, by its jack-up and the lower surface of intermediate mass 32 is abutted against by control slide block back-moving spring 39.It is machined with control slide block 44
Control slide block through hole 45 and bypass oil duct 38.When fuel injection beginning, because the middle throttle orifice 33 on intermediate mass 32 and control are slided
Two sections of throttling actions of block through hole 45, the fuel pressure more normal fuel injector of decline in control chamber 43 is slower, reaches reduction
The effect of discharged nitrous oxides.When end of injection, because the upper surface fuel pressure of control slide block 44 is higher than lower surface, control is slided
Block 44 can overcome the initial tension of spring of control slide block back-moving spring 39 to bottom offset, open bypass oil duct 38 so that control chamber 43
Interior fuel pressure is set up rapidly, improves needle-valve and takes a seat response.As fuel oil enters control chamber 43, the upper and lower side of control slide block 44
Face oil pressure can reach unanimity.In the presence of control slide block back-moving spring 39, control slide block 44 resets.
From the above-mentioned course of work, in a kind of injection process of On Fluctuations oil return bypass type electric-controlled fuel injector of the invention,
The form of two-position three-way valve is employed, dynamic recirculating oil quantity is greatly reduced, On Fluctuations oil return function is realized.It is built in control chamber 43
The control slide block through hole 45 of middle control slide block 44 and the bypass structure of oil duct 38, it is ensured that injection initial stage low injection rate and oil spout
Terminate can quick oil-break the characteristics of.Whole injection process uses solenoid valve control, using electromagnetic force with acting balancing valve bar 34
Motion, realizes to injection process fast response time, and control accuracy is high, the requirement of variable fuel injection characteristic.Oil injector body 11 is built-in
Current limliting valve module 3, prevents persistently carrying out for abnormal injection state, it is ensured that the stability of the course of work.The present invention is applied to altogether
When in rail system, under big oil mass spray regime, common rail pressure can be effectively reduced using pressure accumulation chamber 2 and fluctuated, it is each so as to reduce
The uniformity and stability of cylinder injection process decline the generation of phenomenon.
Claims (5)
1. a kind of On Fluctuations oil return bypass type 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, nozzle, descending high-pressure oil passage, injector head are arranged on oil injector body top, 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, and current limliting valve module is arranged on
In pressure accumulation chamber, electromagnetic valve component, needle valve assembly, nozzle are installed in oil injector body lower end successively, and tight cap is located at electromagnetic valve component, needle-valve
Component, nozzle exterior, the mode that the upper end of tight cap is connected through a screw thread are connected with oil injector body bottom；
The current limliting valve module includes limit spring seat, current limliting piston, ball valve return spring holder, support slipper, limit spring,
Current limliting piston, ball valve return spring holder arranged from top to bottom, and damping spring is installed between limit spring seat and current limliting piston, is supported
Sliding block is arranged in ball valve return spring holder, ball valve is set between the upper end of support slipper and current limliting piston, under support slipper
Mounting ball valve back-moving spring between end and ball valve return spring holder below, sets piston blind hole and current limliting in current limliting piston
Hole, sets axial central through hole in support slipper, bridging oil is set between ball valve return spring holder and oil injector body below
Chamber, piston blind hole connection pressure accumulation chamber and metering hole, metering hole is connected or disconnected with axial central through hole under the control of ball valve, axle
Connected with transition oil pocket to central through hole；
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, oil-feed damping hole is set in valve seat, spill port, middle oil duct, centre are set in intermediate mass
Throttle orifice, oil-feed damping hole connection balance valve rod epicoele, middle throttle orifice is respectively communicated with middle oil duct peace weighing apparatus valve rod cavity of resorption, returns
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, 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 nozzle, is formed between control slide block and needle-valve body
Control chamber, in control chamber set control slide block back-moving spring, needle-valve body middle part set bossing, bossing with its above
Needle-valve back-moving spring is set between needle-valve stop collar, and the upper surface of control slide block sets intermediate cavity, control is set in control slide block
Slider throughbores, bleed off circuit, control slide block through hole are respectively communicated with intermediate cavity and control chamber, bleed off circuit connection control chamber, needle-valve
Oil holding slot is formed between body and nozzle, nozzle-end sets spray orifice；
Middle oil duct connects intermediate cavity, the upper end connection transition oil pocket of descending high-pressure oil passage, through oil injector body, valve seat, intermediate mass,
Needle-valve stop collar, nozzle connection oil holding slot, oil-feed damping hole connect descending high-pressure oil passage.
2. a kind of On Fluctuations oil return bypass type 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 bypass type 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, middle throttle orifice and spill port oil return to fuel tank, and needle-valve body is lifted up, spray
Open oil spout in hole；After coil blackout, balance valve rod is moved downward in the effect of magnetic valve back-moving spring, is crushed on intermediate mass upper end
On face, balance valve rod 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
Enter control chamber through oil-feed damping hole, balance valve rod epicoele, balance valve rod cavity of resorption, middle oil duct, intermediate cavity.
4. a kind of On Fluctuations oil return bypass type electric-controlled fuel injector according to claim 1 and 2, it is characterized in that：Spray orifice stops
During oil spout, control slide block upper surface fuel pressure is higher than its lower surface, and control slide block overcomes the spring of control slide block back-moving spring
Pretightning force to bottom offset, open, as fuel oil enters control chamber, work of the control slide block in control slide block back-moving spring by bleed off circuit
Under firmly, initial position is returned to.
5. a kind of On Fluctuations oil return bypass type electric-controlled fuel injector according to claim 3, it is characterized in that：Spray orifice stops oil spout
When, control slide block upper surface fuel pressure is higher than its lower surface, and control slide block overcomes the spring pre-tightening of control slide block back-moving spring
Power to bottom offset, open, as fuel oil enters control chamber, active force of the control slide block in control slide block back-moving spring by bleed off circuit
Under, return to initial position.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710046478.1A CN106704066A (en) | 2017-01-18 | 2017-01-18 | Micro-dynamic fuel return bypass type electronically controlled fuel injector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710046478.1A CN106704066A (en) | 2017-01-18 | 2017-01-18 | Micro-dynamic fuel return bypass type electronically controlled fuel injector |
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| CN201710046478.1A Pending CN106704066A (en) | 2017-01-18 | 2017-01-18 | Micro-dynamic fuel return bypass type electronically controlled fuel injector |
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