CN106762288A - A kind of pressure accumulation orifice-plate type electric-controlled fuel injector with hydraulic feedback - Google Patents
A kind of pressure accumulation orifice-plate type electric-controlled fuel injector with hydraulic feedback Download PDFInfo
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- CN106762288A CN106762288A CN201710034975.XA CN201710034975A CN106762288A CN 106762288 A CN106762288 A CN 106762288A CN 201710034975 A CN201710034975 A CN 201710034975A CN 106762288 A CN106762288 A CN 106762288A
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- valve
- oil
- needle
- pressure
- fuel
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
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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
- F02M61/1853—Orifice plates
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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
- F02M63/0049—Combined valve units, e.g. for controlling pumping chamber and injection valve
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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
It is an object of the invention to provide a kind of pressure accumulation orifice-plate type electric-controlled fuel injector with hydraulic feedback, including injector head, oil injector body, current limliting valve module, electromagnetic valve component, needle valve assembly, etc. part.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 during big pulsewidth oil spout, the stabilization of each cylinder injection process.Current limliting valve module is arranged on pressure accumulation chamber lower section, it is to avoid abnormal the carrying out for continuing oil spout.The addition of electromagnetic valve component internal feedback oil circuit, slow down the unlatching of needle-valve, accelerate taking a seat for needle-valve.And the two-way oil-feed in the orifice throttle hole, annular side oil circuit in needle valve assembly, further speed up building for control chamber and press through journey, the response speed that needle-valve is taken a seat greatly improved.The AND DEWATERING FOR ORIFICE STRUCTURE of processing, efficiently reduces the dynamic recirculating oil quantity in injection process in needle valve assembly, the characteristics of realize On Fluctuations oil return.Nozzle segment internal hydraulic pressure balance, it is poor without static pressure, realize function of the fuel injector without static leakage.
Description
Technical field
The present invention relates to a kind of engine fueling injection equipment, specifically high-pressure common rail oil injection device.
Background technology
With the fuel consumption and emission characteristic requirements more and more higher to engine, the limitation of discharge essentially consists in nitrogen oxygen
Two aspects of compound and particulate matter.In order to reduce the discharge of nitrogen oxides, it is desirable in fuel injection beginning needle-valve can be controlled to open,
So that having low fuel injection rate and the gentle fuel injection rate form for rising in ignition time delay, this advantageously ensures that injection process and spray
The uniformity of oil cut rate shape；In end of injection, the closing velocity of needle-valve is rapid, beneficial to the fast run-up pressure of system.Can realize
Anxious injection characteristics curve, makes soot emissions and oil consumption minimum after first delaying.Additionally, in injection process, there is compression ignition high always
Oil is flowed through into and out of oily throttle orifice.This partial high pressure fuel oil is pressurizeed by oil pump, is not done work but and is returned directly to fuel tank, dynamic
Recirculating oil quantity is big, causes energy loss.
The content of the invention
It is an object of the invention to provide achievable On Fluctuations oil return, rapid pressure, needle-valve response characteristic protrusion are built and without quiet
A kind of pressure accumulation orifice-plate type electric-controlled fuel injector with hydraulic feedback of state leakage function.
The object of the present invention is achieved like this：
A kind of pressure accumulation orifice-plate type electric-controlled fuel injector with hydraulic feedback of the present invention, it is characterized in that：Including injector head, oil spout
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,
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 and control sliding block, limit
Position spring base, current limliting piston, ball valve return spring holder are arranged, are installed between limit spring seat and current limliting piston and damped from top to bottom
Spring, support and control sliding block is arranged in ball valve return spring holder, is set between the upper end of support and control sliding block and current limliting piston
Ball valve, mounting ball valve back-moving spring between the lower end of support and control sliding block and ball valve return spring holder below, current limliting piston
In piston blind hole and metering hole are set, axial central through hole is set in support and control sliding block, ball valve return spring holder with below
Oil injector body between transition oil pocket is set, piston blind hole connection pressure accumulation chamber and metering hole, metering hole and axial central through hole exist
Connected under the control of ball valve or disconnected, axial centre leads to through hole 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 the bottom of valve rod, balance valve-rod cavity is formed between valve seat and intermediate mass, oil return is set in intermediate mass
Hole, middle oil circuit, lower shape fuel feed hole, feedback oil circuit, middle oil circuit, feedback oil circuit are respectively communicated with balance valve-rod cavity, and spill port exists
Connect or disconnect with middle oil circuit and fuel tank under the control for balancing valve rod；
The needle valve assembly includes needle-valve stop collar, orifice plate, needle-valve body, nozzle, and needle-valve stop collar is located in nozzle, orifice plate
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, orifice plate
Control chamber is formed between needle-valve body, providing holes sheet reset spring in control chamber, needle-valve body middle part sets bossing, lug boss
Divide and needle-valve back-moving spring be set and the needle-valve stop collar above it between, the upper surface of orifice plate is respectively provided with low pressure port, high-pressure mouth,
Throttle orifice is set, and throttle orifice is respectively communicated with low pressure port and control chamber, high-pressure mouth connects descending fuel feed hole in orifice plate, orifice plate with its outside
Side oil circuit is formed between the needle-valve stop collar in portion, oil holding slot is formed between needle-valve body and nozzle, nozzle-end sets spray orifice；
Middle oil communication low pressure port, descending high-pressure oil passage upper end connection transition oil pocket, through oil injector body, valve seat, in
Between block, nozzle connection oil holding slot, descending fuel feed hole and feedback oil circuit be respectively communicated with 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 sliding block it is overall to
Bottom offset, and ball valve is not landed on ball valve return spring holder, metering hole is communicated with axial central through hole；When the combustion of spray orifice outflow
When oil quality exceedes threshold value, current limliting piston compresses ball valve and it is seated at ball valve return spring holder, metering hole and axial centre
Through hole disconnects；When spray orifice stops oil spout, in the presence of ball valve back-moving spring, current limliting piston, ball valve and support and control sliding block are whole
Body returns to initial position.
2nd, during coil electricity, balance valve rod is moved upwards, and spill port is connected state with fuel tank, and the fuel oil in control chamber leads to
, to fuel tank, needle-valve body is lifted up for oil circuit and spill port oil return in the middle of crossing, and spray orifice opens oil spout；After coil blackout, valve rod is balanced
Moved downward in the effect of magnetic valve back-moving spring, be crushed on intermediate mass upper surface, spill port disconnects with fuel tank.
Advantage of the invention is that：Present invention employs the structure of the built-in orifice plate of control chamber.The structure of this orifice plate can
The dynamic recirculating oil quantity of injection process intermediate fuel oil is significantly decreased, energy loss is significantly reduced, the economy of system is improve.
Hydraulic feedback oil circuit is added inside the intermediate mass of electromagnetic valve component, it has connected high-pressure oil passage and middle oil circuit so that needle-valve
System can also be made to build pressure rapidly while opening slow, improve the seating velocity of needle-valve, control fuel injector can be tied quickly
Beam oil spout.Present invention employs pressure accumulation cavity configuration, the pressure oscillation of whole injection system can be substantially improved, can particularly subtracted
Interfering with each other during small each fuel injector oil spout.Current limliting valve module is employed in structure of the present invention, abnormal injection is effectively prevent
Etc. the generation of abnormal conditions, it is ensured that improve while the injection process of normal table fuel economy and fuel injector work
Reliability.Nozzle segment internal hydraulic pressure balance, it is poor without static pressure, realize function of the fuel injector without static leakage.
Brief description of the drawings
Fig. 1 is structural representation of the invention；
Fig. 2 is current limliting valve module schematic diagram；
Fig. 3 is electromagnetic valve component schematic diagram；
Fig. 4 is needle valve assembly schematic diagram；
Fig. 5 is A-A views.
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, the present invention includes injector head 1, current limliting valve module 3, electromagnetic valve component 5, needle valve assembly 6, tight cap
9th, oil injector body 10.Injector head 1 by screw thread be connected and is arranged on oil injector body 10, and by being placed on oil spout
Sealing ring 2 on body 10 is sealed.Main fuel feed hole 12 is set in injector head 1, and with oil injector body 10 in pressure accumulation chamber
11 connections.The lower section of pressure accumulation chamber 11 is provided with current limliting valve module 3.Current limliting valve module 3 is arranged on inside oil injector body 10, its primary structure
Include back-up ring 13, damping spring 14, ball valve 16, support and control sliding block 17, ball valve back-moving spring 20, ball valve return spring holder
21st, current limliting piston 22, limit spring seat 24.Wherein, metering hole 15 and piston blind hole 23 are processed on current limliting piston 22, axially
Central through hole 18 is processed on support and control sliding block 17, this ensure that fuel oil can smoothly flow to lower section oil circuit.Oil injector body
10 lower sections are sequentially provided with electromagnetic valve component 5, needle valve assembly 6, and assembly connection is carried out by tight cap 9.The primary structure of electromagnetic valve component 5
Include magnetic valve return spring holder 25, coil 26, armature 27, valve seat 28, intermediate mass 33, balance valve rod 34, electromagnet 35, electricity
Magnet valve back-moving spring 36.Armature 27 and the balance combination of valve rod 34 are arranged on inside valve seat 28.Feedback oil circuit 29, spill port 30, under
The processing such as traveling oilhole 31, middle oil circuit 32 are inside intermediate mass 33.Positioned at the primary structure bag of needle valve assembly 6 of fuel injector bottom
Include orifice plate 38, orifice plate back-moving spring 39, needle-valve stop collar 40, needle-valve body 41, nozzle 42, needle-valve back-moving spring 43.Intermediate mass 33
Control chamber 44 is formed with needle-valve stop collar 40 and needle-valve body 41.Orifice plate 38 is positioned in control chamber 44.Needle-valve body 41 is arranged on spray
In mouth 42, the upper end of needle-valve body 41 for being cased with needle-valve back-moving spring 43 is arranged in needle chamber, between needle-valve body 41 and nozzle 42
Oil holding slot 8 is set.
Fig. 1 is a kind of overall structure diagram of the pressure accumulation orifice-plate type electric-controlled fuel injector with hydraulic feedback of the present invention, oil spout
Pressure accumulation chamber 11 is provided with body 10, pressure accumulation chamber 11 is connected with the main fuel feed hole 12 on injector head 1.Oil pocket in current limliting piston 22
The metering hole 15 for passing sequentially through piston blind hole 23 and being opened in thereon is connected with pressure accumulation chamber 11.Injector head 1 and oil injector body 10
Assembled by threaded line, sealing ring 2 is sealed the two.When the high pressure fuel that conveying is come in is entered by main fuel feed hole 12
When entering fuel injector inside, can be down through current limliting valve module 3 by the fuel oil in pressure accumulation chamber 11.Fuel oil flows from current limliting valve module 3
Descending high-pressure oil passage 4 is flowed through after going out and enters control chamber 44 and oil holding slot 8.The lower section of oil injector body 10 has been sequentially arranged electromagnetic valve component
5th, needle valve assembly 6.In electromagnetic valve component 5, armature 27 is controlled by electromagnetic force and lifting and taking a seat for valve rod 34 is balanced.When
When coil 26 is powered, balance valve rod 34 is lifted up, and spill port 30 is opened, and the intermediate fuel oil of control chamber 44 is flowed through in throttle orifice 45 successively
Between oil circuit 32, by the draining of spill port 30.Therefore the fuel pressure of control chamber 44 declines, with pressure initiation fuel oil pressure in oil holding slot 8
Difference so that needle-valve body 41 is lifted, fuel injection beginning.During being somebody's turn to do, needle-valve stop collar 40 plays the work of the displacement of limitation needle-valve body 41
With.When coil 26 is powered off, when balance valve rod 34 is taken a seat downwards, spill port 30 is closed.A part of fuel oil is flowed by feeding back oil circuit 29
Through balancing valve rod 34, middle oil circuit 32 in the throttle orifice 45 entered into needle valve assembly 6；Another part fuel oil is by descending oil-feed
Hole 31 enters the high-pressure mouth 37 of side downstream, and high-pressure mouth 37 forms an annular oil groove, surrounds in the rear surface of intermediate mass 33
Circular low pressure port 47.Due to feed back oil circuit 29 oil-feed the oil pressure of circular low pressure port 47 is raised, annular oil groove and circle low pressure
The oil pressure of the high pressure fuel in mouth 47 forms pressure difference with oil pressure in control chamber 44 so that orifice plate 38 overcomes orifice plate back-moving spring 39
Spring force is moved downward, and opens the side oil circuit 46 of orifice plate 38.Flow through the compression ignition high of middle oil circuit 32 and descending fuel feed hole 31
Oil quickly enters control chamber 44 by annular side oil circuit 46 and the two-way of throttle orifice 45, and quickly sets up oil pressure so that needle-valve body
41 take a seat, so as to terminate injection process.Needle-valve body 41 is arranged on inside nozzle 42, and is compressed by needle-valve back-moving spring 43.Nozzle
42 and electromagnetic valve component 5 be all arranged on inside tight cap 9, and fastened by oil injector body 10 and threaded line.The internal hydraulic pressure of nozzle 42
Balance, it is poor without static pressure, realize function of the fuel injector without static leakage.
Fig. 2 is flow-limiting valve components structural representation of the present invention.It is by back-up ring 13, damping spring 14, ball valve 16, support
Control slide block 17, ball valve back-moving spring 20, ball valve return spring holder 21, current limliting piston 22, limit spring seat 24 etc. are constituted.Current limliting
Valve module 3 is arranged on inside oil injector body 10 by pressure accumulation chamber 11.Back-up ring 13 not only serves spacing to overall current limliting valve module 3
Effect, and coordinated with limit spring seat 24, on the one hand as the spring base of damping spring 14, on the other hand limit
Flow the maximum displacement of piston 22.Under the initial tension of spring effect of damping spring 14 and ball valve back-moving spring 20, ball valve 16 is with limit
The upper surface of the lower surface and support and control sliding block 17 of flowing piston 22 coordinates.Ball valve return spring holder 21 is in ball valve back-moving spring 20
Spring-force driven dual under, be pressed in bottom, at its top variable cross-section formed ball valve 16 face of taking a seat.High pressure fuel passes through pressure accumulation
The piston blind hole 23 that chamber 11 enters in current limliting piston 22, flows through metering hole 15 and enters into the axial centre of support and control sliding block 17 and lead to
Hole 18.The fuel oil of outflow leads to lower section oil circuit by descending high-pressure oil passage 4.When fuel injector normal work, spray orifice 7 sprays combustion
Oil so that the fuel pressure in transition oil pocket 19 declines.Because metering hole 15 is to the throttling action of fuel oil so that current limliting piston 22
Fuel pressure in interior piston blind hole 23 and pressure accumulation chamber 11 is raised, and forms pressure difference with the fuel pressure of transition oil pocket 19, therefore limit
Stream piston 22, ball valve 16 and the three of support and control sliding block 17 are overall to bottom offset, and this fuel oil just to fuel injector injection is carried out
Certain compensation, but will not cause that ball valve 16 is landed on ball valve return spring holder 21.When oil spout is stopped, with fuel oil
Metering hole 15 is flowed through, the pressure difference of the upper and lower surface of current limliting piston 22 can be gradually reduced, in the presence of ball valve back-moving spring 20, current limliting
Piston 22, ball valve 16 and the three of support and control sliding block 17 return to initial position again.When the continual injection fuel oil of spray orifice 7,
The fuel oil quality of outflow exceedes threshold value so that when abnormal operation occurs in fuel injector, the lower section transition oil pocket of current limliting piston 22
19 oil pressure declines rapidly, forms upper and lower pressure difference, causes current limliting piston 22 to compress ball valve 16 and is landed in ball valve return spring holder 21
On, prevent fuel oil to continue to circulate.Due to having cut off fuel delivery, fuel injector is stopped, and this is just reduced to a certain extent
The occurrence of abnormal injection, improve 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 magnetic valve return spring holder 25, coil 26, rank
Iron 27, valve seat 28, intermediate mass 33, balance valve rod 34, electromagnet 35, magnetic valve back-moving spring 36 etc. are constituted.Magnetic valve reset bullet
Spring abutment 25, coil 26, electromagnet 35 and magnetic valve back-moving spring 36 are built in oil injector body 10, wherein magnetic valve back-moving spring
Seat 25 is by screw threads for fastening in magnetic valve top.Magnetic valve back-moving spring 36 is in magnetic valve return spring holder 25 and armature 27 2
Between person, armature 27 and balance valve rod 34 are arranged on inside the valve seat 28 of the lower section of oil injector body 10.Intermediate mass 33 is in valve seat 28
Lower section.When fuel injector commencement of fuel injection, coil 26 is powered, and magnetic loop is formed with armature 27 and electromagnet 35, produces electromagnetic force, is inhaled
Draw and moved on balance valve rod 34, the spill port 30 in intermediate mass 33 is opened.At this moment, during the fuel oil in control chamber 44 is passed sequentially through
Between oil circuit 32 and the oil return of spill port 30 to fuel tank, due to the throttling action of middle oil circuit 32, the fuel pressure of control chamber 44 is slower
Decline, the upper surface of needle-valve body 41 is pressurized and reduces, pressure difference is formed with the fuel pressure in oil holding slot 8.Under differential pressure action, needle-valve body
41 slowly lift upwards, and spray orifice 7 opens oil spout.When fuel injector stops oil spout, coil 26 is powered off, due to armature 27 and balanced valve
Bar 34 is closely as one, therefore the initial tension of spring effect that they are jointly subjected to magnetic valve back-moving spring 36 is moved downward, and
It is pressed on the upper surface of intermediate mass 33, and has blocked spill port 30.At the same time, there is two-way oil-feed in intermediate mass 33, all the way
It is to flow through middle oil circuit 32 into lower section needle valve assembly by feeding back oil circuit 29；Another road is directly entered by descending fuel feed hole 31
Enter lower section oil circuit.In whole injection process, there is high pressure fuel to enter top oil pocket by feeding back oil circuit 29 always, reduce control
The oil pressure fall off rate of chamber 44 so that the pressure drop at the oil spout initial stage of control chamber 44 diminishes and slows down, and reduces the generation of nitrogen oxides；
And in end of injection, normal single fuel feed hole is improve to the voltage built-up rate of control chamber 44, the seating velocity of needle-valve is improve,
And optimize needle-valve response speed.
Fig. 4 is needle valve assembly part-structure schematic diagram of the present invention.The primary structure of needle valve assembly 5 includes that orifice plate 38, orifice plate is multiple
Position spring 39, needle-valve stop collar 40, needle-valve body 41, nozzle 42, needle-valve back-moving spring 43.Before fuel injection beginning, whole control chamber
44 is, in hydrodynamic equilibrium state, to be each filled with high pressure fuel.And orifice plate 38 is due to by the initial tension of spring of orifice plate back-moving spring 39
Effect blocks high-pressure mouth 37 by jack-up.When coil 26 is powered, after the balance valve rod 34 of magnetic valve is lifted, spill port 30 is opened.
The throttle orifice 45 and middle oil circuit 32 that fuel oil in control chamber 44 is flowed through on orifice plate 38 successively carry out oil return.With in control chamber 44
Fuel pressure declines, and needle-valve body 41 overcomes the initial tension of spring of needle-valve back-moving spring 43 to be lifted up, commencement of fuel injection.In oil spout
Cheng Zhong, the presence of throttle orifice 45 causes that fuel pressure in control chamber 44 is higher than fuel pressure in middle oil circuit 32, its pressure
The fuel pressure in annular oil groove for being enough to overcome high-pressure mouth 37 to be formed difference and spring force with joint efforts, so, orifice plate 38
The lower surface of intermediate mass 33 is pressed on always, the annular oil groove that descending fuel feed hole 31 enters side downstream has been blocked, and is prevented
The entrance of high pressure fuel, effectively reduces the high pressure fuel amount that low-pressure reservoir is flowed back in injection process.When coil 26 is powered off, electricity
After the balance valve rod 34 of magnet valve is taken a seat, spill port 30 is plugged.Due to there is feedback oil circuit 29, by feeding back what oil circuit 29 entered
High pressure fuel causes that the oil pressure of middle oil circuit 32 rises until orifice plate 38 is opened.The inner high voltage fuel oil of high-pressure mouth 37 is with control chamber 44
Fuel pressure formed pressure difference so that orifice plate 38 overcomes the initial tension of spring of orifice plate back-moving spring 39, orifice plate 38 to move down opening, with
This simultaneously, the peripheral circular side oil circuit 46 of orifice plate 38 is opened.High pressure fuel flows through descending fuel feed hole 31 all the way, flows through successively all the way
Feedback oil circuit 29, middle oil circuit 32, finally all enter control chamber 44, control by throttle orifice 45 and the two-way of annular side oil circuit 46
Oil pressure is quickly set up in chamber 44, and needle-valve is taken a seat rapidly, and oil spout stops.
Fig. 5 is the section A-A enlarged drawing of needle-valve body 41.Its arcwall face can be very good to play guide effect.
From the above-mentioned course of work, a kind of oil spout of the pressure accumulation orifice-plate type electric-controlled fuel injector with hydraulic feedback of the present invention
Cheng Zhong, is built in the structure of orifice plate 38 in needle valve assembly 6, substantially reduces the dynamic recirculating oil quantity in injection process, it is ensured that micro-
The characteristics of dynamic oil return.By the internal feedback oil circuit 29 of electromagnetic valve component 5, the two-way oil-feed of descending fuel feed hole 31 and needle valve assembly
The two-way oil-feed of the throttle orifice 45, annular side oil circuit 46 of 6 orifice plates 38, greatly improved building for control chamber 44 and presses through journey, improve
The response speed that needle-valve is taken a seat.Additionally, oil injector body 10 built with current limliting valve module 3, effectively prevent abnormal injection
State is persistently carried out, it is ensured that the stability and fuel economy of the course of work.Whole injection process uses solenoid valve control,
Using motion of the electromagnetic force with acting balancing valve bar 34, realize to injection process fast response time, control accuracy is high, variable oil spout
The requirement of rule.The present invention is applied to when on common rail system, and under big oil mass spray regime, the structure using pressure accumulation chamber 11 can have
Effect reduces common rail pressure fluctuation, and the generation of phenomenon is declined so as to the uniformity and stability that reduce each cylinder injection process.
Claims (3)
1. a kind of pressure accumulation orifice-plate type electric-controlled fuel injector with hydraulic feedback, it is characterized in that：Including injector head, oil injector body, limit
Stream valve module, electromagnetic valve component, needle valve assembly, 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 are installed in oil injector body lower end successively, and tight cap is located at electromagnetic valve component, needle valve assembly
Outside, 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, spacing bullet
Spring abutment, current limliting piston, ball valve return spring holder are arranged, are installed between limit spring seat and current limliting piston and damp bullet from top to bottom
Spring, support and control sliding block is arranged in ball valve return spring holder, and ball is set between the upper end of support and control sliding block and current limliting piston
Valve, mounting ball valve back-moving spring between the lower end of support and control sliding block and ball valve return spring holder below, in current limliting piston
Piston blind hole and metering hole are set, axial central through hole are set in support and control sliding block, ball valve return spring holder with below
Transition oil pocket is set between oil injector body, and piston blind hole connects pressure accumulation chamber and metering hole, and metering hole is with axial central through hole in ball
Connected under the control of valve or disconnected, axial centre leads to through hole 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, balance valve rod bottom, between valve seat and intermediate mass formed balance valve-rod cavity, in intermediate mass set spill port,
Middle oil circuit, lower shape fuel feed hole, feedback oil circuit, middle oil circuit, feedback oil circuit are respectively communicated with balance valve-rod cavity, and spill port is in balance
Connect or disconnect with middle oil circuit and fuel tank under the control of valve rod；
The needle valve assembly includes needle-valve stop collar, orifice plate, needle-valve body, nozzle, and needle-valve stop collar is located in nozzle, and orifice plate is located at
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, orifice plate and pin
Control chamber is formed between valve body, providing holes sheet reset spring in control chamber, needle-valve body middle part set bossing, bossing with
Needle-valve back-moving spring is set between the needle-valve stop collar above it, and the upper surface of orifice plate is respectively provided with low pressure port, high-pressure mouth, orifice plate
In throttle orifice is set, throttle orifice is respectively communicated with low pressure port and control chamber, and high-pressure mouth connects descending fuel feed hole, and orifice plate is outside with it
Side oil circuit is formed between needle-valve stop collar, oil holding slot is formed between needle-valve body and nozzle, nozzle-end sets spray orifice；
Middle oil communication low pressure port, descending high-pressure oil passage upper end connection transition oil pocket, through oil injector body, valve seat, intermediate mass,
Nozzle connects oil holding slot, and descending fuel feed hole and feedback oil circuit are respectively communicated with descending high-pressure oil passage.
2. a kind of pressure accumulation orifice-plate type electric-controlled fuel injector with hydraulic feedback according to claim 1, it is characterized in that：Spray orifice sprays
When oily, the fuel pressure of transition oil pocket declines, and current limliting piston, ball valve, support and control sliding block do not fall integrally to bottom offset, and ball valve
On ball valve return spring holder, metering hole is communicated seat with axial central through hole；When the fuel oil quality of spray orifice outflow exceedes threshold value,
Current limliting piston compresses ball valve and it is seated at ball valve return spring holder, and metering hole disconnects with axial central through hole；Spray orifice stops
During oil spout, in the presence of ball valve back-moving spring, current limliting piston, ball valve and support and control sliding block integrally return to initial position.
3. a kind of pressure accumulation orifice-plate type electric-controlled fuel injector with hydraulic feedback according to claim 1 and 2, it is characterized in that：Line
When circle is powered, balance valve rod is moved upwards, and spill port and fuel tank are connected state, the fuel oil in control chamber pass through middle oil circuit 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 resets in magnetic valve
The effect of spring is moved downward, and is crushed on intermediate mass upper surface, and spill port disconnects with fuel tank.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710034975.XA CN106762288B (en) | 2017-01-18 | 2017-01-18 | Pressure accumulation hole plate type electric control oil injector with hydraulic feedback |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710034975.XA CN106762288B (en) | 2017-01-18 | 2017-01-18 | Pressure accumulation hole plate type electric control oil injector with hydraulic feedback |
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| CN106762288A true CN106762288A (en) | 2017-05-31 |
| CN106762288B CN106762288B (en) | 2023-03-17 |
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| CN115387944A (en) * | 2022-09-01 | 2022-11-25 | 哈尔滨工程大学 | Low-oil return variable needle valve opening speed electric control oil injector |
| CN116085159A (en) * | 2023-03-31 | 2023-05-09 | 哈尔滨工程大学 | Common rail fuel injector capable of realizing stable injection based on multistage self-pressure regulation dissipation |
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| CN116085159B (en) * | 2023-03-31 | 2023-07-21 | 哈尔滨工程大学 | Common rail fuel injector capable of realizing stable injection based on multistage self-pressure regulation dissipation |
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| CN106762288B (en) | 2023-03-17 |
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