CN106762289A - Pressure accumulation orifice-plate type electric-controlled fuel injector - Google Patents
Pressure accumulation orifice-plate type electric-controlled fuel injector Download PDFInfo
- Publication number
- CN106762289A CN106762289A CN201710034995.7A CN201710034995A CN106762289A CN 106762289 A CN106762289 A CN 106762289A CN 201710034995 A CN201710034995 A CN 201710034995A CN 106762289 A CN106762289 A CN 106762289A
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- Prior art keywords
- valve
- oil
- needle
- fuel
- pressure
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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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle 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
- 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
- F02M61/1853—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
- F02M63/0033—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
It is an object of the invention to provide pressure accumulation orifice-plate type electric-controlled fuel injector, the part such as including injector head, oil injector body, current limliting valve module, electromagnetic valve component, needle valve assembly.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 in 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.Oil injector body bottom processing electromagnetic valve component drives stem movement by electromagnetic force, can realize flexible Injection strategy and the injection process that response is fast, control accuracy is high.By orifice throttle hole, the two-way oil-feed of annular side oil circuit, accelerate building for control chamber and press through journey, improve the response speed that needle-valve is taken a seat.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
Start progressively to use high speed electromagnetic valve type fuel injector to adapt to newest Abgasgesetz in the market.It is this automatically controlled
The characteristics of fuel injector is protruded is to control high-speed electromagnetic valve using the electric signal of ECU output to realize flexible oil spout rule
Rule.Using the fuel injector of high-speed electromagnetic valve, its faster system response, control accuracy is high, the ability with multi-injection.But this electricity
Control fuel injector there is also area for improvement：In injection process, there is high pressure fuel always and flow 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, and dynamic recirculating oil quantity is big, causes energy to damage
Lose.
The content of the invention
It is an object of the invention to provide achievable On Fluctuations oil return, needle-valve response characteristic is protruded and without static leakage function
Pressure accumulation orifice-plate type electric-controlled fuel injector.
The object of the present invention is achieved like this：
Pressure accumulation orifice-plate 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, descending high-pressure oil passage, injector head are arranged on oil injector body top, and injector head inside is set
Main fuel feed hole, oil injector body inside sets pressure accumulation chamber, and main fuel feed hole is communicated with pressure accumulation chamber, and current limliting valve module is arranged on pressure accumulation chamber
In, electromagnetic valve component, needle valve assembly are installed in oil injector body lower end successively, and tight cap is located at outside electromagnetic valve component, needle valve assembly, tightly
The mode that the upper end of cap is connected through a screw thread is connected with oil injector body bottom；
The current limliting valve module includes limit spring seat, current limliting piston, ball valve return spring holder, support and control sliding block, 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 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
Spill port, middle oil circuit, descending fuel feed hole be set below valve seat, in intermediate mass, spill port under the control of balance valve rod with
Fuel tank is connected or disconnected；
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 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 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
Oil circuit, spill port oil return to fuel tank in the middle of crossing, needle-valve body are lifted up, and spray orifice opens oil spout；After coil blackout, balance valve rod exists
The effect of magnetic valve back-moving spring is moved downward, and is crushed on intermediate mass upper surface, and spill port disconnects with fuel tank.
Advantage of the invention is that：Present invention employs the structure of the built-in section 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.
Present invention employs pressure accumulation cavity configuration, the pressure oscillation of whole injection system can be substantially improved, can particularly reduce each
Interfering with each other during fuel injector oil spout.Current limliting valve module is employed in structure of the present invention, abnormal injection etc. is being effectively prevent not just
Often the occurrence of, it is ensured that the reliability of fuel economy and fuel injector work is improve while the injection process of normal table
Property.The present invention balances valve rod to adjust the switch of oil return circuit by solenoid valve control, is conducive to improving the response speed of needle-valve
And control accuracy, there is provided flexible fuel injection characteristic, effectively improve the discharge stability and economy of diesel engine.Spray nozzle part
It is point internal hydraulic pressure balance, 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, pressure accumulation orifice-plate type electric-controlled fuel injector of the present invention includes injector head 1, current limliting valve module 3, magnetic valve
Component 5, needle valve assembly 6, tight cap 9, oil injector body 10.Injector head 1 by screw thread be connected and is arranged on oil injector body
On 10, and sealed by the sealing ring 2 being placed on oil injector body 10.The main fuel feed hole 12 of setting in injector head 1, and with
Pressure accumulation chamber 11 in oil injector body 10 connects.The lower section of pressure accumulation chamber 11 is provided with current limliting valve module 3.Current limliting valve module 3 is arranged on oil spout
Inside body 10, its primary structure includes back-up ring 13, damping spring 14, ball valve 16, support and control sliding block 17, ball valve reset bullet
Spring 20, ball valve return spring holder 21, current limliting piston 22, limit spring seat 24.Wherein, metering hole 15 and piston blind hole 23 are processed
On current limliting piston 22, axial central through hole 18 is processed on support and control sliding block 17, this ensure that fuel oil can smoothly flow
Oil circuit downwards.The lower section of oil injector body 10 is 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 includes magnetic valve return spring holder 25, coil 26, armature 27, valve seat 28, intermediate mass 32, flat
Weighing apparatus valve rod 33, electromagnet 34, magnetic valve back-moving spring 35.Armature 27 and the balance combination of valve rod 33 are arranged on inside valve seat 28.Return
The processing such as oilhole 29, descending fuel feed hole 30, middle oil circuit 31 are inside intermediate mass 32.Positioned at the needle valve assembly 6 of fuel injector bottom
Primary structure includes orifice plate 37, orifice plate back-moving spring 38, needle-valve stop collar 39, needle-valve body 40, nozzle 41, needle-valve back-moving spring
42.Intermediate mass 32 forms control chamber 43 with needle-valve stop collar 39 and needle-valve body 40.Orifice plate 37 is positioned in control chamber 43.Needle-valve body
40 be arranged on nozzle 41 in, the upper end of needle-valve body 40 for being cased with needle-valve back-moving spring 42 is arranged in needle chamber, needle-valve body 40 with
Oil holding slot 8 is set between nozzle 41.
Fig. 1 is the overall structure diagram of pressure accumulation orifice-plate type electric-controlled fuel injector of the present invention, and pressure accumulation is provided with oil injector body 10
Chamber 11, pressure accumulation chamber 11 is connected with the main fuel feed hole 12 on injector head 1.Oil pocket passes sequentially through piston blind hole in current limliting piston 22
23 and the metering hole 15 that is opened in thereon be connected with pressure accumulation chamber 11.Injector head 1 enters luggage with oil injector body 10 by threaded line
Match somebody with somebody, sealing ring 2 is sealed the two.When the high pressure fuel that conveying is come in enters fuel injector inside by main fuel feed hole 12,
Can be down through current limliting valve module 3 by the fuel oil in pressure accumulation chamber 11.Fuel oil flows through lower horizontal high voltage from after the outflow of current limliting valve module 3
Oil circuit 4 enters control chamber 43 and oil holding slot 8.The lower section of oil injector body 10 has been sequentially arranged electromagnetic valve component 5, needle valve assembly 6.In electricity
In electromagnetic valve component 5, armature 27 is controlled by electromagnetic force and lifting and taking a seat for valve rod 33 is balanced.When coil 26 is powered, put down
Weighing apparatus valve rod 33 is lifted up, and spill port 29 is opened, and the intermediate fuel oil of control chamber 43 flows through throttle orifice 44 and middle oil circuit 31 successively, passes through
The draining of spill port 29.Therefore the fuel pressure of control chamber 43 declines, with pressure initiation fuel oil pressure difference in oil holding slot 8 so that needle-valve body
40 lift, fuel injection beginning.During being somebody's turn to do, needle-valve stop collar 39 plays a part of to limit the displacement of needle-valve body 40.Coil 26 is powered off
When, when balance valve rod 33 is taken a seat downwards, spill port 29 is closed, and fuel oil enters the high-pressure mouth of side downstream by descending fuel feed hole 30
36, high-pressure mouth 36 forms an annular oil groove in the rear surface of intermediate mass 32, surrounds circular low pressure port 46.Annular oil groove and circle
The oil pressure of the high pressure fuel in shape low pressure port 46 forms pressure difference with oil pressure in control chamber 43 so that orifice plate 37 overcomes orifice plate reset bullet
The spring force of spring 38 is moved downward, and opens the side oil circuit 45 of orifice plate 37.Flow through middle oil circuit 31 and descending fuel feed hole 30
High pressure fuel quickly enters control chamber 43 by annular side oil circuit 45 and the two-way of throttle orifice 44, and quickly sets up oil pressure so that
Needle-valve body 40 is taken a seat, so as to terminate injection process.Needle-valve body 40 is arranged on inside nozzle 41, and is pressed by needle-valve back-moving spring 42
Tightly.Nozzle 41 and electromagnetic valve component 5 are all arranged on inside tight cap 9, and are fastened by oil injector body 10 and threaded line.In nozzle 41
It is portion's hydro-cushion, 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 32, balance valve rod 33, electromagnet 34, magnetic valve back-moving spring 35 etc. are constituted.Magnetic valve reset bullet
Spring abutment 25, coil 26, electromagnet 34 and magnetic valve back-moving spring 35 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 35 is in magnetic valve return spring holder 25 and armature 27 2
Between person, armature 27 and balance valve rod 33 are set inside the valve seat 28 of the lower section of oil injector body 10.Intermediate mass 32 is in valve
The lower section of seat 28.When fuel injector commencement of fuel injection, coil 26 is powered, and magnetic loop is formed with armature 27 and electromagnet 34, produces electromagnetism
Power, attracts to be moved on balance valve rod 33, and the spill port 29 in intermediate mass 32 is opened.At this moment, the fuel oil in control chamber 43 is successively
By middle oil circuit 31 and the oil return of spill port 29 to fuel tank, the fuel pressure of control chamber 43 declines, and the upper surface of needle-valve body 40 is pressurized
Reduce, pressure difference is formed with the fuel pressure in oil holding slot 8.Needle-valve body 40 is lifted up, and opens the oil spout of spray orifice 7.When fuel injector stops
Only during oil spout, coil 26 is powered off, and because armature 34 and balance valve rod 33 are closely as one, therefore they are jointly subjected to magnetic valve
The initial tension of spring effect of back-moving spring 25 is moved downward, and is pressed on the upper surface of intermediate mass 32, and has blocked spill port
29.The oil-feed of descending fuel feed hole 30 in intermediate mass 32, enters into lower section needle valve assembly.
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 37, orifice plate is multiple
Position spring 38, needle-valve stop collar 39, needle-valve body 40, nozzle 41, needle-valve back-moving spring 42.Before fuel injection beginning, whole control chamber
43 is, in hydrodynamic equilibrium state, to be each filled with high pressure fuel.And orifice plate 37 is due to by the initial tension of spring of orifice plate back-moving spring 38
Effect blocks high-pressure mouth 36 by jack-up.When coil 26 is powered, after the balance valve rod 33 of magnetic valve is lifted, spill port 29 is opened.
The throttle orifice 44 and middle oil circuit 31 that fuel oil in control chamber 43 is flowed through on orifice plate 37 successively carry out oil return.With in control chamber 43
Fuel pressure declines, and needle-valve body 40 overcomes the initial tension of spring of needle-valve back-moving spring 42 to be lifted up, commencement of fuel injection.In oil spout
Cheng Zhong, the presence of throttle orifice 44 causes that fuel pressure in control chamber 43 is higher than fuel pressure in middle oil circuit 31, its pressure
The fuel pressure in annular oil groove for being enough to overcome high-pressure mouth 36 to be formed difference and spring force with joint efforts, so, orifice plate 37
The lower surface of intermediate mass 32 is pressed on always, the annular oil groove that descending fuel feed hole 30 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 33 of magnet valve is taken a seat, spill port 29 is plugged.Because oil pressure is higher than the middle oil pressure of oil circuit 31 in control chamber 43,
In the presence of pressure difference, fuel oil is back in middle oil circuit 31 in control chamber 43, and the fuel pressure of middle oil circuit 31 rises until pressure
Difference zero.The inner high voltage fuel oil of high-pressure mouth 36 forms pressure difference with the fuel pressure in control chamber 43 so that orifice plate 37 overcomes orifice plate to answer
The initial tension of spring of position spring 39, orifice plate 37 moves down opening, and at the same time, the peripheral circular side oil circuit 45 of orifice plate 37 is opened.It is high
Compression ignition oil flows through descending fuel feed hole 30, and control chamber 43, control chamber 43 are entered by throttle orifice 44 and the two-way of annular side oil circuit 45
Interior oil pressure is quickly set up, 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 40.Its arcwall face can be very good to play guide effect.
From the above-mentioned course of work, in the injection process of pressure accumulation orifice-plate type electric-controlled fuel injector of the present invention, needle-valve is built in
The structure of orifice plate 37 in component 6, substantially reduces the dynamic recirculating oil quantity in injection process, it is ensured that the characteristics of On Fluctuations oil return.
By the two-way oil-feed of the throttle orifice 44, annular side oil circuit 45 of orifice plate 37, accelerate building for control chamber 43 and press 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 shape
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, profit
The motion of balance valve rod 33 is driven with electromagnetic force, is realized to injection process fast response time, control accuracy is high, variable oil spout rule
The requirement of rule.The present invention is applied to when on common rail system, under big oil mass spray regime, can be effective using the structure in pressure accumulation chamber 11
Reduce common rail pressure fluctuation, the generation of phenomenon is declined so as to the uniformity and stability that reduce each cylinder injection process.
Claims (3)
1. pressure accumulation orifice-plate type electric-controlled fuel injector, it is characterized in that：Including injector head, oil injector body, current limliting valve module, solenoid valve block
Part, needle valve assembly, descending high-pressure oil passage, injector head are arranged on oil injector body top, and injector head inside sets main fuel feed hole,
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 in pressure accumulation chamber, oil injector body
Electromagnetic valve component, needle valve assembly are installed in lower end successively, and tight cap is located at outside electromagnetic valve component, needle valve assembly, and the upper end of tight cap leads to
The mode for crossing 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 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 central through hole is connected with transition oil pocket；
The electromagnetic valve component include electromagnet, coil, armature, balance valve rod, valve seat, intermediate mass, wound around coil on electromagnet,
Electromagnet top sets magnetic valve return spring holder, and electromagnet lower section sets armature, between armature and magnetic valve return spring holder
Magnetic valve back-moving spring is set, and balance valve rod is located in valve seat, and balance valve rod upper end is connected with armature, and intermediate mass is arranged on valve
Seat lower section, sets spill port, middle oil circuit, descending fuel feed hole in intermediate mass, spill port under the control of balance valve rod with fuel tank
Connection disconnects；
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 connects descending high-pressure oil passage.
2. pressure accumulation orifice-plate type electric-controlled fuel injector according to claim 1, it is characterized in that：During spray orifice oil spout, transition oil pocket
Fuel pressure declines, and current limliting piston, ball valve, support and control sliding block are overall to bottom offset, and ball valve is not landed in ball valve reset bullet
On spring abutment, metering hole is communicated with axial central through hole；When the fuel oil quality of spray orifice outflow exceedes threshold value, current limliting piston compresses ball
Valve simultaneously makes it be seated at ball valve return spring holder, and metering hole disconnects with axial central through hole；It is multiple in ball valve when spray orifice stops oil spout
In the presence of the spring of position, current limliting piston, ball valve and support and control sliding block integrally return to initial position.
3. pressure accumulation orifice-plate type electric-controlled fuel injector according to claim 1 and 2, it is characterized in that：During coil electricity, valve rod is balanced
Motion upwards, spill port is connected state with fuel tank, and the fuel oil in control chamber passes through middle oil circuit, 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, spill port disconnects with fuel tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710034995.7A CN106762289A (en) | 2017-01-18 | 2017-01-18 | Pressure accumulation orifice-plate type electric-controlled fuel injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710034995.7A CN106762289A (en) | 2017-01-18 | 2017-01-18 | Pressure accumulation orifice-plate type electric-controlled fuel injector |
Publications (1)
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| CN106762289A true CN106762289A (en) | 2017-05-31 |
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| CN201710034995.7A Pending CN106762289A (en) | 2017-01-18 | 2017-01-18 | Pressure accumulation orifice-plate type electric-controlled fuel injector |
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