CN206513485U - A kind of two-way oil-feed resonance bypass type electric-controlled fuel injector with ditch - Google Patents
A kind of two-way oil-feed resonance bypass type electric-controlled fuel injector with ditch Download PDFInfo
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- CN206513485U CN206513485U CN201720056296.8U CN201720056296U CN206513485U CN 206513485 U CN206513485 U CN 206513485U CN 201720056296 U CN201720056296 U CN 201720056296U CN 206513485 U CN206513485 U CN 206513485U
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Abstract
The purpose of this utility model is to provide a kind of two-way oil-feed resonance bypass type electric-controlled fuel injector with ditch, including injector head, oil injector body, current limliting valve module, electromagnetic valve component, needle valve assembly, nozzle, needle seating.Flow-limiting valve component bottom is machined with resonant through holes and resonance throttle orifice, reduces the fluctuation of the fuel oil by current limliting valve module.Lower section is provided with electromagnetic valve component and needle valve assembly.Magnetic valve uses two-position three-way valve form, to reduce dynamic recirculating oil quantity.Control chamber positioned inside has a control slide block, and with intermediate mass contact, plays a part of slowing down the injection rate at injection initial stage and accelerates needle-valve and takes a seat response.Control chamber has further speeded up voltage built-up rate by the way of two-way oil-feed, realizes the fast response characteristic of fuel injector.Needle-valve body surface sets the ditch of micron level depth, can effectively improve the stability of hole flow, reduce fuel injector cavitation pitting degree.Poor without static pressure inside fuel injector, fuel injector is without static leakage.
Description
Technical field
The utility model relates to a kind of engine fueling injection equipment.
Background technology
High speed electromagnetic valve type fuel injector realizes complicated fuel injection characteristic by controller, and it has response fast, control accuracy
Height, flexible and reliable working performance the advantage of control strategy.But as the injection pressure in current fuel injection device is stepped up,
Fuel injector performance is also tested by each side：There is the situation of static leakage in the case of not oil spout in fuel injector；Two two
The dynamic recirculating oil quantity of the form of port valve is larger, influences fuel utilization ratio；Injection initial stage, injection rate is excessive to cause nitrogen oxides
Discharge capacity increase, and spray and terminate, control chamber single channel oil-feed, voltage built-up rate is slow so that oil-break is not rapid, causes granular material discharged
Rise；Needle valve movement and fuel oil injection can evoke surge pressure wave, cause the fuel pressure of each cavity volume to change；In the spray of big oil mass
When penetrating, the injection process of fuel injector may influence the fluctuation of common rail pressure so that under each cylinder injection process stability and uniformity
Drop.As what fuel injector worked gradually increases, flow velocity is accelerated, and hole and cavitation pitting degree are substantially strengthened in fuel injector, and fuel injector can
Decline by property.
The content of the invention
The purpose of this utility model is to provide response characteristic soon, and fuel pressure fluctuation is small, can realize spray anxious after first delaying
Oily rate time course curve, a kind of two-way oil-feed resonance bypass type with ditch without static leakage function and reduction cavitation pitting
Electric-controlled fuel injector.
What the purpose of this utility model was realized in：
A kind of two-way oil-feed resonance bypass type electric-controlled fuel injector with ditch of the utility model, it is characterized in that：Including spray
Oily device head, oil injector body, current limliting valve module, electromagnetic valve component, needle valve assembly, needle seating, nozzle, descending high-pressure oil passage, oil spout
Device head is arranged on above oil injector body, is set inside injector head and pressure accumulation chamber, main oil-feed are set inside main fuel feed hole, oil injector body
Hole is communicated with pressure accumulation chamber, and current limliting valve module is arranged in pressure accumulation chamber, and electromagnetic valve component, needle-valve group are installed in oil injector body lower end successively
Part, needle seating, tight cap are located at electromagnetic valve component, needle valve assembly, outside needle seating, the mode that the upper end of tight cap is connected through a screw thread
It 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 from top to bottom, are installed and are damped between limit spring seat and current limliting piston
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
Mounting ball valve back-moving spring, current limliting piston between ball valve, the lower end of support and control sliding block and ball valve return spring holder below
In set to set in piston blind hole and metering hole, support and control sliding block and set humorous in axial central through hole, ball valve return spring holder
Shaken through hole and resonance throttle orifice, and transition oil pocket, piston blind hole are set between ball valve return spring holder and oil injector body below
Pressure accumulation chamber and metering hole are connected, metering hole is connected or disconnected under the control of ball valve with axial central through hole, resonant through holes are harmonious
The throttle orifice that shakes connects axial central through hole and transition oil pocket；
The electromagnetic valve component includes winding on electromagnet, coil, armature, balance valve rod, valve seat, intermediate mass, electromagnet
Set above coil, electromagnet and armature is set below magnetic valve return spring holder, electromagnet, armature and magnetic valve return spring holder
Between magnetic valve back-moving spring is set, balance valve rod is located in valve seat, and balance valve rod upper end and armature are connected, and intermediate mass is set
Below valve seat, balance and balance valve rod epicoele formed between the middle part of valve rod and valve seat, balance the bottom of valve rod, valve seat and
Balance valve rod cavity of resorption is formed between intermediate mass, set in valve seat set in up fuel feed hole, intermediate mass spill port, middle oil duct,
Middle throttle orifice, up oilhole connection balance valve rod epicoele, middle throttle orifice is respectively communicated with middle oil duct peace weighing apparatus valve rod cavity of resorption,
Spill port is connected or disconnected with middle throttle orifice and fuel tank under the control of balance valve rod；
The needle valve assembly includes needle-valve stop collar, control slide block, needle-valve body, and control slide block is located in needle-valve stop collar,
The upper part of needle-valve body is located in needle-valve stop collar, and the lower part of needle-valve body is located in needle seating, control slide block and needle-valve body it
Between formed in control chamber, control chamber bossing be set in the middle part of setting control slide block back-moving spring, needle-valve body, bossing and its
Needle-valve back-moving spring is set between the needle-valve stop collar of top, and the upper surface of control slide block is set to be set in intermediate cavity, control slide block
Fuel feed hole, control slide block through hole, bleed off circuit are put, fuel feed hole connects intermediate cavity, control slide block through hole point by meter in hole
Not Lian Tong intermediate cavity and control chamber, bleed off circuit connection control chamber, oil holding slot is formed between needle-valve body and needle seating；
The nozzle includes spray orifice and ditch, and spray orifice is machined on needle seating, and ditch is set and long needle-valve bottom surface
On；
Middle oil duct connects intermediate cavity, the upper end connection transition oil pocket of descending high-pressure oil passage, through oil injector body, valve seat, in
Between block, needle-valve stop collar, needle seating connection oil holding slot, up fuel feed hole connects descending high-pressure oil passage.
The utility model can also include：
1st, the ditch is particularly located between the sealing cone formed when long needle-valve is taken a seat and needle-valve body bottom, ditch
Number is the integral multiple of nozzle hole number, and the depth of ditch is micron order.
2nd, 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；The fuel oil matter flowed out when spray orifice
When amount exceedes threshold value, current limliting piston compresses ball valve and it is seated at ball valve return spring holder, metering hole and axial central through hole
Disconnect；When spray orifice stops oil spout, in the presence of ball valve back-moving spring, current limliting piston, ball valve and support slipper are integrally returned to
Initial position；
During coil electricity, balance valve rod is moved upwards, and balance valve rod epicoele is off-state, oil return with balance valve rod cavity of resorption
Hole and fuel tank are that the fuel oil in connected state, control chamber passes through middle oil duct, middle throttle orifice and spill port oil return to fuel tank, pin
Valve body is lifted up, and spray orifice opens oil spout；After coil blackout, balance valve rod is moved downward in the effect of magnetic valve back-moving spring,
It is crushed on intermediate mass upper surface, balance valve rod epicoele is connected with balance valve rod cavity of resorption, and spill port disconnects with fuel tank, while descending
On the one hand fuel oil in high-pressure oil passage enters through up fuel feed hole, balance valve rod epicoele, balance valve rod cavity of resorption, middle oil duct controls
Chamber, on the other hand enters control chamber through fuel feed hole, meter in hole.
3rd, when spray orifice stops oil spout, control slide block upper surface fuel pressure is higher than its lower surface, and control slide block overcomes control
The initial tension of spring of sliding block back-moving spring is opened to bottom offset, bleed off circuit, and as fuel oil enters control chamber, control slide block is in control
Under the active force of sliding block back-moving spring processed, initial position is returned to.
4th, the diameter in the middle part of resonance throttle orifice is less than the diameter at its two ends, and less than the diameter of resonant through holes, resonance throttling
Hole is consistent with the total length of resonant through holes axial direction.
Advantage of the present utility model is：The utility model employs pressure accumulation cavity configuration, under conditions of big distributive value, protects
Persistently the taking place without for injection process for demonstrate,proving fuel injector causes larger fluctuation to common rail fuel pressure and causes other fuel injectors to spray
Oily process is affected.The utility model uses current limliting valve module, effectively reduces the generation of abnormal injection situation, it is ensured that just
The injection process often stablized.Meanwhile, resonance structure is added in current limliting valve module, fuel pressure fluctuation is reduced, improves oil spout
The stability of 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 improve the economy of fuel oil.The balance valve rod of fuel injector is adopted
With the form of two-bit triplet, the conical surface, the two-way sealing of plane can be achieved, dynamic recirculating oil quantity is reduced.Processed in valve seat and intermediate mass
Two-way oil-feed oil duct, the bypass oil duct of control slide block can cause control chamber quicker in balanced valve control valve rod and control chamber
Pressure is built on ground, improves needle-valve response characteristic.Control slide block throttle orifice and the design of middle throttling ensure that fuel injector in the early stage can
Slow oil spout, reduces the formation of nitrogen oxides.The utility model employs ditch structure, according to the requirement of actual condition, matching
Diameter, depth and the number of ditch, make it improve the stability of hole flow, reduce the best results of fuel injector cavitation pitting degree.
Needle valve assembly partial interior is poor without static pressure, it is ensured that fuel injector can realize the function of static No leakage.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model；
Fig. 2 is current limliting valve module schematic diagram；
Fig. 3 is electromagnetic valve component schematic diagram；
Fig. 4 is needle valve assembly schematic diagram；
Fig. 5 is A-A schematic diagrames；
Fig. 6 is the utility model nozzle segment structural representation.
Embodiment
Illustrate below in conjunction with the accompanying drawings and the utility model is described in more detail：
With reference to Fig. 1-6, a kind of two-way oil-feed resonance bypass type electric-controlled fuel injector with ditch of the utility model is mainly tied
Structure include injector head 1, oil injector body 11, current limliting valve module 3, electromagnetic valve component 10, tight cap 9, needle valve assembly 5, needle seating 6,
Nozzle 7.Injector head 1 is connected with oil injector body 11 by screw thread, and with the sealing being placed on oil injector body 11
Circle 12 is sealed.Main fuel feed hole 13 on injector head 1 is connected with the pressure accumulation chamber 2 in oil injector body 11.Under oil injector body 11
Side is electromagnetic valve component 10, needle seating 6 and needle valve assembly 5, and three passes through the tight assembly connection of cap 9.Current limliting valve module 3 is placed on spray
Inside oily body 11, its structure mainly include back-up ring 14, limit spring seat 27, damping spring 15, current limliting piston 16, ball valve 25,
Support and control sliding block 18, ball valve back-moving spring 19, ball valve return spring holder 23.Machined on current limliting piston 16 metering hole 17 and
Piston blind hole 26, support and control sliding block 18 is machined with axial central through hole 24, it is ensured that fuel oil can lead to lower section oil circuit.Ball valve resets
The bottom of spring base 23 is machined with two resonance holes, respectively resonance throttle orifice 22 and resonant through holes 20.The bottom of oil injector body 11
Electromagnetic valve component 10 is provided between the top of needle seating 6, primary structure includes magnetic valve back-moving spring 28, magnetic valve and resetted
Spring base 39, coil 29, electromagnet 38, armature 37, valve seat 30, intermediate mass 34, balance valve rod 36.Armature 37 and balance valve rod 36
Combination is placed in valve seat 30, and the up fuel feed hole 31 of processing in valve seat 30.Spill port 32, centre are machined with intermediate mass 34
Oil duct 33, middle throttle orifice 35 etc..The lower section of electromagnetic valve component 10 is needle valve assembly 5, and primary structure includes control slide block 47, needle-valve
Stop collar 45, control slide block back-moving spring 42, needle-valve body 43, needle-valve back-moving spring 44.Control slide block 47 is placed in control chamber 46,
It is machined with meter in hole 49, control slide block through hole 41 and bypass oil duct 40.On meter in hole 49 and needle-valve stop collar 45
Fuel feed hole 48 is connected.Spray orifice 50 is processed on needle seating 6, the surface of needle-valve body 43 sets the ditch 51 of micron level depth.
Fig. 1 is the overall structure diagram of the utility model fuel injector.Main fuel feed hole 13 is machined with injector head 1,
The high pressure fuel conveyed by high-pressure oil pipe is entered inside fuel injector by main fuel feed hole 13.Injector head 1 leads to oil injector body 11
Cross threaded line to be assembled, there is sealing ring 12 to be sealed between the two.Main fuel feed hole 13 is connected with pressure accumulation chamber 2.In pressure accumulation
Fuel oil in chamber 2 can pass through current limliting valve module 3 downwards.Fuel oil is entered after the outflow of current limliting valve module 3 by descending high-pressure oil passage 4
Control chamber 46 and oil holding slot 8.Electromagnetic valve component 10 is equipped between the bottom of oil injector body 11 and needle valve assembly 5.Electromagnetic valve component
Armature 37 is controlled using electromagnetic force and balance lifting and taking a seat for valve rod 36 in 10.When being lifted up of valve rod 36 of balance, return
Oilhole 32 is opened, and the fuel oil of control chamber 46 flows through control slide block through hole 41, middle oil duct 33 and middle throttle orifice 35, passes through oil return
The venting of hole 32.The fuel pressure of control chamber 46 declines, with the formation fuel oil pressure difference of oil holding slot 8 so that needle-valve body 43 is lifted, and oil spout is opened
Begin.Now, the spacing of needle-valve body 43 is realized by needle-valve stop collar 45.Due to control slide block through hole 41 and middle throttling
Two sections of throttling actions in hole 35, the fuel pressure of middle oil duct 33 will not decline rapidly, so as to slow down the fuel oil of control chamber 46
The decrease speed of pressure.When balance valve rod 36 downwards take a seat when, spill port 32 is closed, fuel oil both can by up fuel feed hole 31,
Flow through balance valve rod 36, middle throttle orifice 35, middle oil duct 37, control slide block through hole 41 and bypass oil duct 40 and enter control chamber
46, also control chamber 46 can be directly entered by fuel feed hole 48 and meter in hole 49 so that control chamber 46 builds pressure, needle-valve body 43 falls
Seat, injection process terminates.Meanwhile, the needle-valve body 43 compressed by needle-valve back-moving spring 44 is placed with needle seating 6, such as Fig. 5 is pin
The section A-A enlarged drawing of valve body 43.The arcwall face of needle-valve body 43 can be very good to play guide effect.The inside nothing of needle valve assembly 5
Static pressure is poor, it is ensured that the characteristic without static leakage of fuel injector.Needle valve assembly 5 and electromagnetic valve component 10 are both placed in tight cap 9
It is interior, then fastened by threaded line and oil injector body 11.
Fig. 2 is the utility model flow-limiting valve components structural representation.Current limliting valve module 3 mainly includes back-up ring 14, limit
Position spring base 27, damping spring 15, current limliting piston 16, ball valve 25, support and control sliding block 18, ball valve back-moving spring 19, ball valve are multiple
Position spring base 23 etc..Whole current limliting valve module 3 is placed in inside oil injector body 11 by pressure accumulation chamber 2, and it is entered by back-up ring 14
Row is spacing.Limit spring seat 27 and back-up ring 14 coordinate, on the one hand as the spring base of damping spring 15, and on the other hand current limliting is lived
Restriction effect is played in the maximum displacement of plug 16.The initial tension of spring of spring 15 and ball valve back-moving spring 19 dampened, ball valve 25 is same
The lower surface of current limliting piston 16 and the upper surface of support and control sliding block 18 coordinate.Ball valve return spring holder 23 is by ball valve back-moving spring
19 spring force, is pressed in bottom, is the face of taking a seat of ball valve 25 at its top variable cross-section.Fuel oil enters current limliting by pressure accumulation chamber 2
Piston blind hole 26 in piston 16, then pass through the axial central through hole 24 of the entrance support and control of metering hole 17 sliding block 18.By axial direction
The fuel oil that central through hole 24 flows out enters transition oil pocket 21 by resonant through holes 20 and resonance throttle orifice 22.Processing resonance is set to lead to
Hole 20 and resonance throttle orifice 22 to reduce by the amplitude of the fuel pressure wave of holes.Due to having one section in resonance throttle orifice 22
Aperture is smaller compared with resonant through holes 20, and its restriction effect is stronger, causes the fuel flow rate difference flowed through from holes so that originally same
The fuel pressure wave of phase produces phase difference, is cancelled out each other after two bursts of fuel pressure wave superpositions, pressure oscillation further reduces, and two
Total length of the hole in axial direction is identical.Descending high-pressure oil passage 4 is connected with transition oil pocket 21 and towards lower section oil circuit.Work as oil spout
During the normal oil spout of device, the fuel pressure that spray orifice 7 is sprayed in fuel oil, transition oil pocket 21 declines.Due to section of the metering hole 17 to fuel oil
Stream is acted on, and the fuel pressure in piston blind hole 26 and pressure accumulation chamber 2 in current limliting piston 16 is larger, is pressed with the formation of transition oil pocket 21
Difference so that current limliting piston 16, ball valve 25 and support and control sliding block 18 are compensated to bottom offset to the fuel oil that fuel injector sprays,
But not ball valve 25 is landed on ball valve return spring holder 23.During end of injection, as fuel oil flows through metering hole 17, current limliting
Piston about 16 pressure difference be gradually reduced, in the presence of ball valve return spring force, current limliting piston 16, ball valve 25 and support and control are slided
Block 18 returns back to original position.When the continual injection fuel oil of fuel injector, the fuel oil quality of outflow exceedes threshold value, and fuel injector occurs different
During normal working condition, because the flow of the fuel oil of the injection of spray orifice 7 is big, flow velocity is fast so that the lower section transition oil pocket of current limliting piston 16
21 oil pressure declines rapidly, pressure difference above and below formation, causes current limliting piston 16 to compress ball valve 25 and is landed in ball valve return spring holder 23
On, prevent fuel flow communication.Due to lacking fuel delivery, fuel injector is stopped, and prevents the lasting progress of abnormal injection.
Fig. 3 is the utility model electromagnetic valve component part-structure schematic diagram.Electromagnetic valve component 10 is main multiple including magnetic valve
Position spring 28, magnetic valve return spring holder 39, coil 29, electromagnet 38, armature 37, valve seat 30, intermediate mass 34, balance valve rod 36
Deng.Magnetic valve return spring holder 39, magnetic valve back-moving spring 28, coil 29 and electromagnet 38 are built in inside oil injector body 11,
Wherein magnetic valve return spring holder 39 by screw threads for fastening in magnetic valve top.Magnetic valve return spring holder 39 and armature 37 it
Between be magnetic valve back-moving spring 28.Armature 37 and balance valve rod 36 are placed on inside the valve seat 30 in the lower section of oil injector body 11.
With the part that valve seat 30 is combined it is intermediate mass 34 in lower section.Whole magnetic valve uses the form of two-position three-way valve.Work as oil spout
During device commencement of fuel injection, the coil 29 of magnetic valve is powered, and with electromagnet 38 and the formation magnetic loop of armature 37, produces electromagnetic force, attracts
Balance valve rod 36 to move upwards, open the spill port 32 in intermediate mass 34, and block up fuel feed hole 31.At this moment, control chamber
Fuel oil in 46 is by middle oil duct 33, middle throttle orifice 35 and the oil return of spill port 32 to fuel tank, and oil pressure declines in control chamber 46,
The upper surface of needle-valve body 43, which is pressurized, to be reduced, the fuel pressure formation pressure difference with oil holding slot 8.Needle-valve body 43 is lifted up, and opens spray orifice 7
Oil spout.When fuel injector stops oil spout, because armature 37 and balance valve rod 36 are closely as one, thus they are jointly subjected to
The initial tension of spring of magnetic valve back-moving spring 28 and be pressed on intermediate mass 34, and blocked spill port 32.At the same time, put down
Weighing apparatus valve rod 36 opens the oil circuit for leading to control chamber 46 by up fuel feed hole 31, middle throttle orifice 35 and middle oil duct 33, and place
In the oil-feed simultaneously of the meter in hole 49 in control slide block 47, improve normal single fuel feed hole and pressure speed is built to control chamber 46
Degree, accelerates the seating velocity of needle-valve.
Fig. 4 is the utility model needle valve assembly part-structure schematic diagram.Needle valve assembly 5 mainly includes control slide block 47, control
Sliding block back-moving spring 42 processed, needle-valve stop collar 45, needle-valve body 43 and needle-valve back-moving spring 44.Control slide block 47 is placed on control chamber
Inside 46, by its jack-up and the lower surface of intermediate mass 34 is abutted against by control slide block back-moving spring 42.Add on needle-valve stop collar 45
Work has fuel feed hole 48.Meter in hole 49, control slide block through hole 41 and bypass oil duct 40 are machined with control slide block 47.Work as oil spout
During beginning, due to two sections of throttling actions of the middle throttle orifice 35 on intermediate mass 34 and control slide block through hole 41, in control chamber 46
Fuel pressure decline that more normal fuel injector is slower, reach the effect for reducing discharged nitrous oxides.When end of injection, by
It is higher than lower surface in the upper surface fuel pressure of control slide block 47, control slide block 47 can overcome the spring of control slide block back-moving spring 42
Pretightning force opens bypass oil duct 40 to bottom offset so that it is more rapid that the fuel pressure in control chamber 46 is set up, and improves pin
Valve is taken a seat response.As fuel oil enters control chamber 46, the upper and lower end face oil pressure of control slide block 47 can reach unanimity.It is multiple in control slide block
In the presence of the spring 42 of position, control slide block 47 resets.
Fig. 6 is nozzle segment structural representation.It is made up of spray orifice 50 and ditch 51.It is close in the motion process of needle-valve body 43
Seal the conical surface to open, fuel oil flows to spray orifice 50 from oil holding slot 8 by sealing cone, ditch 51.Ditch 51 changes the flow direction of fuel oil
And velocity magnitude, and then the flow direction and velocity magnitude of spray orifice porch are have adjusted, the valid circulation area of spray orifice 50 is increased, is reduced
Hole is come into being degree, is stabilized the flowing of the inner cavity of spray orifice 50, be slow down the fluctuation of distributive value, reduce cavitation pitting journey in hole
Degree.
From the above-mentioned course of work, a kind of two-way oil-feed resonance bypass type electronic control injection with ditch of the utility model
In the injection process of device, the form of two-position three-way valve is employed, by being balanced by magnetic valve inside valve rod 36 and intermediate mass 34
Two-way oil-feed, accelerates building for control chamber 46 and presses through journey, improves the response speed that needle-valve is taken a seat.The use of resonance structure is effective
Fuel pressure fluctuation is reduced, the stability of injection process is improved.The control for being built in control slide block 47 in control chamber 46 is slided
Block through hole 41 and the bypass structure of oil duct 40, it is ensured that injection initial stage low injection rate and end of injection can quick oil-break spy
Point.Whole injection process uses solenoid valve control, using motion of the electromagnetic force with acting balancing valve bar 36, realizes to injection process
Fast response time, control accuracy is high, the requirement of variable fuel injection characteristic.Current limliting valve module 3, prevents exception built in oil injector body 11
The lasting progress of oil spout state, it is ensured that the stability of the course of work.The ditch 51 that the surface of needle-valve body 43 is set, effectively improves sky
The stability of cave flowing, reduces fuel injector cavitation pitting degree.When the utility model is applied on common rail system, in the injection of big oil mass
Under state, common rail pressure fluctuation can be effectively reduced using pressure accumulation chamber 2, so as to reduce the uniformity and stably of each cylinder injection process
Property decline phenomenon generation.
Claims (9)
1. a kind of two-way oil-feed resonance bypass type electric-controlled fuel injector with ditch, it is characterized in that：Including injector head, fuel injector
Body, current limliting valve module, electromagnetic valve component, needle valve assembly, needle seating, nozzle, descending high-pressure oil passage, injector head are arranged on oil spout
Set above body, inside injector head and pressure accumulation chamber, main fuel feed hole and pressure accumulation chamber phase are set inside main fuel feed hole, oil injector body
Logical, current limliting valve module is arranged in pressure accumulation chamber, and electromagnetic valve component, needle valve assembly, needle seating are installed in oil injector body lower end successively, tightly
Cap is located at electromagnetic valve component, needle valve assembly, outside needle seating, under mode and oil injector body that the upper end of tight cap is connected through a screw thread
End is connected；
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 from top to bottom, and damping bullet is installed between limit spring seat and current limliting piston
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
In mounting ball valve back-moving spring between valve, the lower end of support and control sliding block and ball valve return spring holder below, current limliting piston
Set to set in piston blind hole and metering hole, support and control sliding block and resonance is set in axial central through hole, ball valve return spring holder
Transition oil pocket is set between through hole and resonance throttle orifice, ball valve return spring holder and oil injector body below, and piston blind hole connects
Logical pressure accumulation chamber and metering hole, metering hole are connected or disconnected under the control of ball valve with axial central through hole, resonant through holes and resonance
Throttle orifice connects axial central through hole and transition oil pocket；
The electromagnetic valve component includes wound around coil on electromagnet, coil, armature, balance valve rod, valve seat, intermediate mass, electromagnet,
Set above electromagnet and armature is set below magnetic valve return spring holder, electromagnet, 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 balance valve rod epicoele is formed between the middle part of valve rod and valve seat, balance bottom, valve seat and the centre of valve rod
Formed to set in balance valve rod cavity of resorption, valve seat between block and spill port, middle oil duct, centre are set in up fuel feed hole, intermediate mass
Throttle orifice, up oilhole connection balance valve rod epicoele, middle throttle orifice is respectively communicated with middle oil duct peace weighing apparatus valve rod cavity of resorption, oil return
Hole connects or disconnected with middle throttle orifice and fuel tank under the control of balance valve rod；
The needle valve assembly includes needle-valve stop collar, control slide block, needle-valve body, and control slide block is located in needle-valve stop collar, needle-valve
The upper part of body is located in needle-valve stop collar, and the lower part of needle-valve body is located in needle seating, shape between control slide block and needle-valve body
Into control chamber, set in control chamber and bossing is set in the middle part of control slide block back-moving spring, needle-valve body, bossing and its top
Needle-valve stop collar between needle-valve back-moving spring is set, the upper surface of control slide block set set in intermediate cavity, control slide block into
Oilhole, control slide block through hole, bleed off circuit, fuel feed hole connect intermediate cavity by meter in hole, and control slide block through hole connects respectively
Logical intermediate cavity and control chamber, bleed off circuit connection control chamber, form oil holding slot between needle-valve body and needle seating；
The nozzle includes spray orifice and ditch, and spray orifice is machined on needle seating, in ditch setting and long needle-valve bottom surface；
Middle oil duct connects intermediate cavity, the upper end connection transition oil pocket of descending high-pressure oil passage, through oil injector body, valve seat, intermediate mass,
Needle-valve stop collar, needle seating connection oil holding slot, up fuel feed hole connect descending high-pressure oil passage.
2. a kind of two-way oil-feed resonance bypass type electric-controlled fuel injector with ditch according to claim 1, it is characterized in that：
The ditch is particularly located between the sealing cone formed when long needle-valve is taken a seat and needle-valve body bottom, and the number of ditch is spray orifice
The integral multiple of number, the depth of ditch is micron order.
3. a kind of two-way oil-feed resonance bypass type electric-controlled fuel injector with ditch according to claim 1 or 2, its feature
It is：During spray orifice oil spout, the fuel pressure of transition oil pocket declines, and current limliting piston, ball valve, support slipper are overall to bottom offset, and ball
Valve is not landed on ball valve return spring holder, and metering hole is communicated with axial central through hole；When the fuel oil quality that spray orifice flows out exceedes
During 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
When hole stops oil spout, in the presence of ball valve back-moving spring, current limliting piston, ball valve and support slipper integrally return to initial bit
Put；
During coil electricity, balance valve rod is moved upwards, and balance valve rod epicoele and balance valve rod cavity of resorption are off-state, spill port with
Fuel tank is that the fuel oil in connected state, control chamber passes through middle oil duct, middle throttle orifice and spill port oil return to fuel tank, needle-valve body
It is lifted up, spray orifice opens oil spout；After coil blackout, balance valve rod is moved downward in the effect of magnetic valve back-moving spring, is pressed
On intermediate mass upper surface, balance valve rod epicoele is connected with balance valve rod cavity of resorption, and spill port disconnects with fuel tank, while lower horizontal high voltage
On the one hand fuel oil in oil circuit enters control chamber through up fuel feed hole, balance valve rod epicoele, balance valve rod cavity of resorption, middle oil duct,
On the other hand control chamber is entered through fuel feed hole, meter in hole.
4. a kind of two-way oil-feed resonance bypass type electric-controlled fuel injector with ditch according to claim 1 or 2, its feature
It is：When spray orifice stops oil spout, control slide block upper surface fuel pressure is higher than its lower surface, and control slide block overcomes control slide block to reset
The initial tension of spring of spring is opened to bottom offset, bleed off circuit, and as fuel oil enters control chamber, control slide block is multiple in control slide block
Under the active force of position spring, initial position is returned to.
5. a kind of two-way oil-feed resonance bypass type electric-controlled fuel injector with ditch according to claim 3, it is characterized in that：
When spray orifice stops oil spout, control slide block upper surface fuel pressure is higher than its lower surface, and control slide block overcomes control slide block to reset bullet
The initial tension of spring of spring is opened to bottom offset, bleed off circuit, and as fuel oil enters control chamber, control slide block resets in control slide block
Under the active force of spring, initial position is returned to.
6. a kind of two-way oil-feed resonance bypass type electric-controlled fuel injector with ditch according to claim 1 or 2, its feature
It is：Diameter in the middle part of resonance throttle orifice is less than the diameter at its two ends, and less than the diameter of resonant through holes, resonance throttle orifice and resonance
The total length of through hole axial direction is consistent.
7. a kind of two-way oil-feed resonance bypass type electric-controlled fuel injector with ditch according to claim 3, it is characterized in that：
Diameter in the middle part of resonance throttle orifice is less than the diameter at its two ends, and less than the diameter of resonant through holes, resonance throttle orifice leads to resonance
Hole axle to total length it is consistent.
8. a kind of two-way oil-feed resonance bypass type electric-controlled fuel injector with ditch according to claim 4, it is characterized in that：
Diameter in the middle part of resonance throttle orifice is less than the diameter at its two ends, and less than the diameter of resonant through holes, resonance throttle orifice leads to resonance
Hole axle to total length it is consistent.
9. a kind of two-way oil-feed resonance bypass type electric-controlled fuel injector with ditch according to claim 5, it is characterized in that：
Diameter in the middle part of resonance throttle orifice is less than the diameter at its two ends, and less than the diameter of resonant through holes, resonance throttle orifice leads to resonance
Hole axle to total length it is consistent.
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| CN201720056296.8U CN206513485U (en) | 2017-01-18 | 2017-01-18 | A kind of two-way oil-feed resonance bypass type electric-controlled fuel injector with ditch |
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| CN201720056296.8U CN206513485U (en) | 2017-01-18 | 2017-01-18 | A kind of two-way oil-feed resonance bypass type electric-controlled fuel injector with ditch |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106593721A (en) * | 2017-01-18 | 2017-04-26 | 哈尔滨工程大学 | Double-path oil feeding resonance bypass type electrically controlled oil sprayer with engraved groove |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106593721A (en) * | 2017-01-18 | 2017-04-26 | 哈尔滨工程大学 | Double-path oil feeding resonance bypass type electrically controlled oil sprayer with engraved groove |
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