CN106640453A - Micro-dynamic oil-returning electric control oil sprayer with hydraulic feedback - Google Patents
Micro-dynamic oil-returning electric control oil sprayer with hydraulic feedback Download PDFInfo
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- CN106640453A CN106640453A CN201710034600.3A CN201710034600A CN106640453A CN 106640453 A CN106640453 A CN 106640453A CN 201710034600 A CN201710034600 A CN 201710034600A CN 106640453 A CN106640453 A CN 106640453A
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- oil
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- fuel
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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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention aims at providing a micro-dynamic oil-returning electric control oil sprayer with hydraulic feedback. The micro-dynamic oil-returning electric control oil sprayer comprises an oil sprayer head, an oil sprayer body, a flow limiting valve assembly, a solenoid valve assembly, a needle valve limiting sleeve, a nozzle and a needle valve body. A pressure accumulation cavity is formed in the oil sprayer body and is communicated with a main oil inlet and the flow limiting valve assembly, so that the stability of an oil spraying process of each cylinder is guaranteed under the condition that the oil spraying amount is great. The flow limiting valve assembly is arranged below the pressure accumulation cavity and the continuous movement of abnormal oil spraying is stopped. The solenoid valve assembly is machined at the bottom of the oil sprayer body and a valve rod is driven by an electromagnetic force to move, and an annular throttling belt and an oil inlet throttling hole on the tapered surface of a balance valve rod are matched with a hydraulic feedback oil path, so that a variable oil spraying rule that an oil spraying speed becomes rapid from slow is realized; and the seating response of a needle valve is accelerated. A solenoid valve adopts a two-position and three-way valve form so that the dynamic oil returning amount in an oil spraying process is greatly reduced. The inner part of the oil sprayer has no static pressure difference and the characteristic that the oil sprayer has no static leakage is guaranteed; and the hydraulic efficiency of the system is improved.
Description
Technical field
The present invention relates to a kind of engine fueling injection equipment.
Background technology
At present, the high-speed electromagnetic valve fuel injector of employing has faster system response, and control accuracy is high, with flexible control plan
Slightly with reliable service behaviour the advantages of.But in view of emission regulation demands are stepped up, this electric-controlled fuel injector exists greatly
Where amount needs to improve and lifted：First, to ensure normal course of injection, its fuel-displaced throttle orifice aperture need to be more than fuel injector
Meter in hole aperture, and wanting further to improve needle-valve response characteristic of taking a seat then needs to increase meter in hole aperture, but this
Sample can cause dynamic recirculating oil quantity to increase, and cause energy loss.If conversely, reducing fuel-displaced throttle orifice to reduce dynamic recirculating oil quantity
Aperture can then cause control chamber voltage built-up rate slack-off, cause needle-valve to be taken a seat delay.Secondly, the control plunger matching parts in fuel injector and
There is static leakage in the axial seal face of pintle nozzle match-ing parts so that system hydraulic efficiency is reduced, and limits entering for fuel injector pressure
One step is lifted.Additionally, when the big oil mass of fuel injector is sprayed, the oil pressure meeting big ups and downs in high-pressure common rail reduce each cylinder oil spout
The uniformity of process.
The content of the invention
It is an object of the invention to provide dynamic recirculating oil quantity is little, variable fuel injection characteristic can be realized and without static leakage function
A kind of On Fluctuations oil return electric-controlled fuel injector with hydraulic feedback.
The object of the present invention is achieved like this：
A kind of On Fluctuations oil return electric-controlled fuel injector with hydraulic feedback of the present invention, 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 is arranged on oil injector body top,
Injector head inside arranges main fuel feed hole, and oil injector body inside arranges 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 are installed successively in oil injector body lower end, tight cap be located at electromagnetic valve component,
Outside needle valve assembly, the mode that the upper end of tight cap is threaded connection is connected with oil injector body bottom；
The current limliting valve module includes limit spring seat, current limliting piston, ball valve return spring holder, support slipper, spacing bullet
Spring abutment, current limliting piston, ball valve return spring holder are arranged from top to bottom, install between limit spring seat and current limliting piston and damp bullet
Spring, support slipper is arranged in ball valve return spring holder, and ball valve is arranged between the upper end of support slipper and current limliting piston, is supported and 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 arrange piston blind hole and
Metering hole, arranges axial central through hole in support slipper, arranged between ball valve return spring holder and oil injector body below
Oil pocket, piston blind hole connection pressure accumulation chamber and metering hole are crossed, metering hole connects 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, winds on electromagnet
Coil, electromagnet top arranges magnetic valve return spring holder, and electromagnet lower section arranges 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 arranged
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
Oil pocket is formed between intermediate mass, meter in hole is set in valve seat, spill port, middle oil duct, hydraulic feedback are set in intermediate mass
Oil duct, meter in hole connection balance valve rod epicoele, middle oil duct and hydraulic feedback oil duct are respectively communicated with oil pocket, and spill port is flat
Connect or disconnect with middle oil duct and fuel tank under the control of weighing apparatus valve rod；
The needle valve assembly includes needle-valve stop collar, nozzle, needle-valve body, and needle-valve stop collar is located in nozzle, needle-valve body
Upper part is located in needle-valve stop collar, and the lower part of needle-valve body is located in nozzle, shape between needle-valve body top and needle-valve stop collar
Into control chamber, arrange raised on needle-valve stop collar, projection is located at control chamber, and needle-valve reset bullet is arranged between needle-valve body and projection
Spring, control chamber is communicated with middle oil duct, and oil holding slot is formed between needle-valve body and nozzle, and nozzle-end arranges spray orifice；
The upper end connection transition oil pocket of descending high-pressure oil passage, Jing oil injector bodies, valve seat, intermediate mass, nozzle connection oil holding slot,
Meter in hole and hydraulic feedback oil duct are 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, 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 that spray orifice flows out
When amount exceedes threshold value, current limliting piston compresses ball valve and makes it be 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, spill port and oil with oil pocket
Case is connected state, and by middle oil duct and spill port oil return to fuel tank, needle-valve body is lifted up the fuel oil in control chamber, spray orifice
Open oil spout；After coil blackout, balance valve rod is moved downward in the effect of magnetic valve back-moving spring, is crushed on intermediate mass upper surface
On, balance valve rod epicoele is connected with oil pocket, and spill port disconnects with fuel tank, while fuel oil one side Jing in descending high-pressure oil passage is entered
Oily throttle orifice, balance valve rod epicoele, oil pocket, middle oil duct enter control chamber, another aspect Jing hydraulic feedback oil duct, oil pocket, in
Between oil duct enter control chamber.
Advantage of the invention is that：Pressure accumulation cavity configuration is present invention employs, 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 impact.The present invention adopts 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 adopts two three
Logical form, is capable of achieving the two-way sealing of the conical surface, plane, reduces dynamic recirculating oil quantity.Ring-type throttling band at the balance valve rod conical surface
Coordinate with meter in hole and hydraulic feedback oil duct and realize variable fuel injection characteristic, and accelerate needle-valve and take a seat response.And spray
It is poor without static pressure inside oily device, it is ensured that fuel injector can realize static leak free function.
Description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is current limliting valve module schematic diagram；
Fig. 3 is electromagnetic valve component schematic diagram；
Fig. 4 is A-A views.
Specific embodiment
Illustrate below in conjunction with the accompanying drawings and the present invention is described in more detail：
With reference to Fig. 1-4, a kind of On Fluctuations oil return electric-controlled fuel injector primary structure with hydraulic feedback of the present invention includes oil spout
Device head 1, oil injector body 14, current limliting valve module 3, electromagnetic valve component 13, tight cap 5, needle-valve stop collar 11, nozzle 7, needle-valve body 8.Spray
Oily device head 1 is connected with oil injector body 14 by screw thread, and is carried out with the sealing ring 15 being placed on oil injector body 14
Sealing.Main fuel feed hole 16 on injector head 1 is connected with the pressure accumulation chamber 2 in oil injector body 14.The lower section of oil injector body 14 is electromagnetism
Valve module 13, nozzle 7 and needle-valve body 8, three passes through the assembly connection of tight cap 5.Current limliting valve module 3 is placed in oil injector body 14
Portion, its structure mainly include back-up ring 17, limit spring seat 28, damping spring 18, current limliting piston 19, ball valve 26, support slipper 21,
Ball valve back-moving spring 22, ball valve return spring holder 24.Metering hole 20 and piston blind hole 27 are machined on current limliting piston 19, is supported
Slide block 21 is machined with axial central through hole 25, it is ensured that fuel oil can lead to lower section oil circuit.The bottom of oil injector body 14 and nozzle 7 it is upper
Electromagnetic valve component 13 is provided between portion, primary structure includes magnetic valve back-moving spring 29, magnetic valve return spring holder 42, coil
30th, electromagnet 41, armature 40, valve seat 31, intermediate mass 37, balance valve rod 39.Armature 40 and the balance combination of valve rod 39 are placed on valve
In seat 31, and the processing meter in hole 32 in valve seat 31.Hydraulic feedback oil circuit 33, the and of spill port 35 are machined with intermediate mass 37
Middle oil duct 36 etc., and form control chamber 6 with needle-valve stop collar 11 and needle-valve body 8.
Fig. 1 is general illustration of the present invention, and main fuel feed hole 16 is machined with injector head 1, is conveyed by high-pressure oil pipe
High pressure fuel is entered inside fuel injector by main fuel feed hole 16.Injector head 1 is assembled with oil injector body 14 by threaded line,
There is sealing ring 15 to be sealed between the two.Main fuel feed hole 16 is connected with pressure accumulation chamber 2.Fuel oil in pressure accumulation chamber 2 can be downward
Through current limliting valve module 3.Fuel oil enters control chamber 6 and oil holding slot from after the outflow of current limliting valve module 3 by descending high-pressure oil passage 4
10.Electromagnetic valve component 13 is equipped between the bottom of oil injector body 14 and nozzle 7.Using electromagnetic force control rank in electromagnetic valve component 13
Iron 40 lifting and taking a seat with balance valve rod 39.When being lifted up of valve rod 39 of balance, spill port 35 is opened, control chamber 6
Fuel oil flows through middle oil duct 36 into oil pocket 33, by the venting of spill port 35.During balance valve rod 39 is lifted, a little portion
Meter in hole 32 is into oil pocket 33 and lets out in low-pressure reservoir to divide fuel oil to pass through.This dynamic recirculating oil quantity is compared to two
The dynamic recirculating oil quantity of two-way valve is low.As the fuel pressure of control chamber 6 declines, fuel oil pressure reduction is formed with oil holding slot 10 so that pin
Valve body 8 overcomes the initial tension of spring of needle-valve back-moving spring 12 to lift, fuel injection beginning.Wherein needle-valve body is limited by needle-valve stop collar 11
8 displacement.When balance valve rod 39 is taken a seat downwards, spill port 35 is closed, and fuel oil can be by meter in hole 32 and hydraulic feedback
Oil duct 34, flows through balance valve rod 39, oil pocket 33 and middle oil duct 36 and enters control chamber 6 so that control chamber 6 builds pressure, and needle-valve body 8 exists
Take a seat under the initial tension of spring of needle-valve back-moving spring 12, injection process terminates.It is placed with by needle-valve back-moving spring 12 in nozzle 7
The needle-valve body 8 of compression, such as Fig. 4 are the section A-A enlarged drawing of needle-valve body 8.The arcwall face of needle-valve body 8 can be very good to play guiding
Effect.It is poor without static pressure inside nozzle 7, it is ensured that the characteristic without static leakage of fuel injector.Nozzle 7 and electromagnetic valve component 13 are equal
It is placed in tight cap 5, then is fastened by threaded line and oil injector body 14.
Fig. 2 is flow-limiting valve components structural representation of the present invention.Current limliting valve module 3 mainly includes back-up ring 17, spacing bullet
Spring abutment 28, damping spring 18, current limliting piston 19, ball valve 26, support slipper 21, ball valve back-moving spring 22, ball valve return spring holder
24 etc..Whole current limliting valve module 3 is placed in inside oil injector body 14 by pressure accumulation chamber 2, and it is carried out by back-up ring 17 spacing.Limit
Position spring base 28 and back-up ring 17 coordinate, on the one hand as the spring base of damping spring 18, on the other hand to current limliting piston 19 most
Big displacement plays restriction effect.The initial tension of spring of spring dampened 18 and ball valve back-moving spring 22, ball valve 26 is with current limliting piston
19 lower surface and the upper surface of support slipper 21 coordinate.Ball valve return spring holder 24 receives the spring force of ball valve back-moving spring 22,
Bottom is pressed in, is the face of taking a seat of ball valve 26 at its top variable cross-section.The work that fuel oil is entered in current limliting piston 19 by pressure accumulation chamber 2
Plug blind hole 27, then the axial central through hole 25 of support slipper 21 is entered by metering hole 20.Flowed out by axial central through hole 25
Fuel oil leads to lower section oil circuit through descending high-pressure oil passage 4.When the normal oil spout of fuel injector, spray orifice 9 sprays fuel oil, transition oil pocket 23
Interior fuel pressure declines.Due to throttling action of the metering hole 20 to fuel oil, the piston blind hole 27 and pressure accumulation in current limliting piston 19
Fuel pressure in chamber 2 is larger, with transition oil pocket 23 formed pressure reduction so that current limliting piston 19, ball valve 26 and support slipper 21 to
Bottom offset, compensates to the fuel oil of fuel injector injection, but ball valve 26 will not be caused to be landed on ball valve return spring holder 24.Spray
At the end of oil, as fuel oil flows through metering hole 20, current limliting piston about 19 pressure reduction be gradually reduced, in the work of ball valve return spring force
With under, current limliting piston 19, ball valve 26 and support slipper 21 return back to original position.When the continual injection fuel oil of spray orifice 9, outflow
Fuel oil quality exceedes threshold value, and when abnormal operation occurs in fuel injector, because the flow of the fuel oil of the injection of spray orifice 9 is big, flow velocity is fast,
So that the oil pressure of the lower section transition oil pocket 23 of current limliting piston 19 declines rapidly, upper and lower pressure reduction is formed, cause current limliting piston 19 to compress
Ball valve 26 is landed on ball valve return spring holder 24, prevents fuel flow communication.Due to lacking fuel delivery, fuel injector quits work,
Prevent persistently carrying out for abnormal injection.
Fig. 3 is electromagnetic valve component part-structure schematic diagram of the present invention.Electromagnetic valve component 13 mainly includes magnetic valve reset bullet
Spring abutment 42, magnetic valve back-moving spring 29, coil 30, electromagnet 41, armature 40, balance valve rod 39, valve seat 31, intermediate mass 37.Electricity
Magnet valve return spring holder 42, magnetic valve back-moving spring 29, coil 30 and electromagnet 41 are built in inside oil injector body 14, wherein electricity
Magnet valve return spring holder 42 is by screw threads for fastening in magnetic valve top.It is electricity between magnetic valve return spring holder 42 and armature 40
Magnet valve back-moving spring 29.Armature 40 and balance valve rod 39 are placed on inside the valve seat 31 in the lower section of oil injector body 14.In lower section
The part combined with valve seat 31 is intermediate mass 37.Whole magnetic valve uses the form of two-position three-way valve.Fuel injector does not work
When, there is ring-type throttling band 38 between the conical surface and the taper faying face of valve seat 31 that balance valve rod 39.When fuel injector commencement of fuel injection
When, the coil 30 of magnetic valve is powered, and with electromagnet 41 and armature 40 magnetic loop is formed, and produces electromagnetic force, attracts balance valve rod 39
Move upwards.The throttling of note ring-type is A1 with 38 equivalent circulation area, and the valid circulation area in meter in hole 32 is A2, and
When functioning equalization valve rod 39 is not pressed on intermediate mass upper surface, A1 is more than A2 to fuel injector.Balance valve rod 39 is in the mistake moved upwards
Cheng Zhong, ring-type throttling can constantly reduce until being 0 with 38 orifice size A1.When A1 be more than A2 when, its restriction effect mainly by
Realize that the pressure release speed of control chamber 6 is fixed in meter in hole 32；When A1 is less than A2, restriction effect is mainly by ring-type throttling band
38 realize, as ring-type throttling constantly reduces with 38 orifice size A1, restriction effect can more and more substantially, and control chamber 6 passes through
The pressure release speed of middle oil duct 36 can be increasingly faster, and injection rate can be stepped up；When balance valve rod 39 moves to complete and valve
After 31 cone match of seat, the no longer oil-feed of meter in hole 32, the draining speed of control chamber 6 reaches maximum, and injection rate reaches most
Greatly.In whole injection process, there is high pressure fuel to pass through hydraulic feedback oil duct 34 always and enter by valve seat 31 and the balance structure of valve rod 39
Into oil pocket 33, slow down the draining speed of oil pocket 33 and control chamber 6 so that the pressure drop at the oil spout initial stage of control chamber 6 diminishes
Slow down, reduce the generation of nitrogen oxides.And in end of injection hydraulic feedback oil duct 34 can accelerate control chamber 6 build pressure speed
Degree, improves the response of taking a seat of needle-valve body 8.
From the above-mentioned course of work, a kind of oil spout of the On Fluctuations oil return electric-controlled fuel injector with hydraulic feedback of the present invention
Cheng Zhong, employs the form of two-position three-way valve, by being balanced the oil-feed inside valve rod 39 and intermediate mass 37 by magnetic valve, reduces
Fuel oil dynamic recirculating oil quantity in injection process.Whole injection process adopts solenoid valve control, using electromagnetic force band acting balancing valve
The motion of bar 39, realizes to injection process fast response time, and control accuracy is high, the requirement of variable fuel injection characteristic.Balance valve rod
When ring-type throttling band 38 and the cooperation of meter in hole 32 and hydraulic feedback oil duct 34 at the conical surface realizes fuel injection beginning by slowly to
Fast variable fuel injection characteristic, and accelerate needle-valve and take a seat response.The built-in current limliting valve module 3 of oil injector body 14, prevents abnormal spray
Oil condition is persistently carried out, it is ensured that the stability of the course of work.When the present invention is applied on common rail system, in big oil mass spurting
Under state, common rail pressure fluctuation can be effectively reduced using pressure accumulation chamber 2, so as to reduce the uniformity and stability of each cylinder injection process
Decline the generation of phenomenon.
Claims (3)
1. a kind of On Fluctuations oil return electric-controlled fuel injector with hydraulic feedback, 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 is arranged on oil injector body top, injector head
Inside arranges main fuel feed hole, and oil injector body inside arranges 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 successively in oil injector body lower end, and tight cap is located at electromagnetic valve component, needle valve assembly
Outside, the mode that the upper end of tight cap is threaded connection is connected with oil injector body bottom；
The current limliting valve module include limit spring seat, current limliting piston, ball valve return spring holder, support slipper, limit spring seat,
Current limliting piston, ball valve return spring holder arrange from top to bottom, and damping spring is installed between limit spring seat and current limliting piston, supports
Slide block is arranged in ball valve return spring holder, ball valve is arranged 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, arranges piston blind hole and current limliting in current limliting piston
Hole, arranges axial central through hole in support slipper, between ball valve return spring holder and oil injector body below bridging oil is arranged
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
Connect 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 arranges magnetic valve return spring holder, and electromagnet lower section arranges 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
Oil pocket is formed between block, meter in hole is set in valve seat, spill port, middle oil duct, hydraulic feedback oil duct are set in intermediate mass,
Meter in hole connection balance valve rod epicoele, middle oil duct and hydraulic feedback oil duct are respectively communicated with oil pocket, and spill port is in balanced valve
Connect or disconnect with middle oil duct and fuel tank under the control of bar；
The needle valve assembly includes needle-valve stop collar, nozzle, needle-valve body, and needle-valve stop collar is located in nozzle, the top of needle-valve body
Divide and be located in needle-valve stop collar, the lower part of needle-valve body is located in nozzle, is formed between needle-valve body top and needle-valve stop collar and is controlled
Chamber processed, arranges raised on needle-valve stop collar, projection is located at control chamber, and needle-valve back-moving spring is arranged between needle-valve body and projection,
Control chamber is communicated with middle oil duct, and oil holding slot is formed between needle-valve body and nozzle, and nozzle-end arranges spray orifice；
The upper end connection transition oil pocket of descending high-pressure oil passage, Jing oil injector bodies, valve seat, intermediate mass, nozzle connection oil holding slot, oil-feed
Throttle orifice and hydraulic feedback oil duct are respectively communicated with descending high-pressure oil passage.
2. a kind of On Fluctuations oil return electric-controlled fuel injector with hydraulic feedback according to claim 1, is characterized in that：Spray orifice sprays
When oily, 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
On ball valve return spring holder, metering hole is communicated with axial central through hole；When the fuel oil quality that spray orifice flows out exceedes threshold value, current limliting
Piston compresses ball valve and makes it be seated at ball valve return spring holder, and metering hole disconnects with axial central through hole；Spray orifice stops oil spout
When, 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 electric-controlled fuel injector with hydraulic feedback according to claim 1 and 2, is characterized in that：Line
When circle is powered, balance valve rod is moved upwards, and balance valve rod epicoele is off-state with oil pocket, and spill port is connected state with fuel tank
State, by middle oil duct and spill port oil return to fuel tank, needle-valve body is lifted up the fuel oil in control chamber, and spray orifice opens oil spout；
After coil blackout, balance valve rod is moved downward in the effect of magnetic valve back-moving spring, is crushed on intermediate mass upper surface, balanced valve
Bar epicoele is connected with oil pocket, and spill port and fuel tank disconnect, while fuel oil one side Jing meter in hole in descending high-pressure oil passage,
Balance valve rod epicoele, oil pocket, middle oil duct enter control chamber, and another aspect Jing hydraulic feedback oil duct, oil pocket, middle oil duct are entered
Control chamber.
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| CN106640453B (en) | 2023-01-03 |
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