CN206352542U - A kind of bypass type electric-controlled fuel injector with ditch - Google Patents
A kind of bypass type electric-controlled fuel injector with ditch Download PDFInfo
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- CN206352542U CN206352542U CN201720056737.4U CN201720056737U CN206352542U CN 206352542 U CN206352542 U CN 206352542U CN 201720056737 U CN201720056737 U CN 201720056737U CN 206352542 U CN206352542 U CN 206352542U
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Abstract
The purpose of this utility model is to provide the parts such as a kind of bypass type electric-controlled fuel injector with ditch, including injector head, oil injector body, current limliting valve module, electromagnetic valve component, tight cap, needle valve assembly, nozzle, needle seating.Pressure accumulation chamber is arranged in oil injector body, is connected with main fuel feed hole with current limliting valve module, it is ensured that in big pulsewidth oil spout, the stabilization of each cylinder injection process.Electromagnetic valve component and needle valve assembly are disposed with below current limliting valve module.They are linked together by tight cap.It is disposed with control slide block inside control chamber, and with intermediate mass contact, plays a part of slowing down the injection rate at injection initial stage and accelerate needle-valve and take a seat response.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.It is the hydro-cushion of needle valve assembly partial interior, poor without static pressure, realize function of the fuel injector without static leakage.
Description
Technical field
The utility model relates to a kind of fueling injection equipment, specifically high-pressure common rail oil injection device.
Background technology
With the fuel consumption and emission characteristic requirements more and more higher to engine, the limitation of discharge essentially consists in nitrogen oxygen
Two aspects of compound and particulate matter.In order to reduce the discharge of nitrogen oxides, it is desirable to needle-valve can be controlled to open in fuel injection beginning,
So that the fuel injection rate form for having low fuel injection rate in ignition time delay and gently rising, this advantageously ensures that injection process and spray
The uniformity of oil cut rate shape；In end of injection, the requirement of needle-valve closing velocity is rapid, beneficial to the fast run-up pressure of system.It can realize
Anxious injection characteristics curve, makes soot emissions and oil consumption minimum after first delaying.As what fuel injector worked gradually increases, flow velocity adds
It hurry up, hole and cavitation pitting degree are substantially strengthened in fuel injector, fuel injector reliability decrease.In addition, the presence of control plunger causes spray
It is poor to there is static pressure in oily device, causes fuel oil static leakage.
The content of the invention
The purpose of this utility model, which is to provide, can realize first slow rear anxious injection rate time history curve, be let out without static state
Leak a kind of bypass type electric-controlled fuel injector with ditch of function and reduction cavitation pitting.
What the purpose of this utility model was realized in：
A kind of bypass type electric-controlled fuel injector with ditch of the utility model, 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, spray are installed in oil injector body lower end successively
Mouth, tight cap is located at electromagnetic valve component, needle valve assembly, outside needle seating, mode and oil spout that the upper end of tight cap is connected through a screw thread
Body bottom is connected；
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 axial central through hole be set in piston blind hole and metering hole, 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 exists with axial central through hole
Connect or disconnect under the control of ball valve, axial central through hole is connected with 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
Spill port, middle throttle orifice, middle oil circuit are set below valve seat, in intermediate mass, and middle oil circuit is communicated with middle throttle orifice, returned
Oilhole 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 communication intermediate cavity, descending high-pressure oil passage upper end connection transition oil pocket, through oil injector body, valve seat, in
Between block, needle-valve stop collar, needle seating connection oil holding slot, 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, 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；The combustion flowed out when spray orifice
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.
3rd, during coil electricity, balance valve rod is moved upwards, and spill port and fuel tank are that the fuel oil in connected state, control chamber leads to
Oil circuit, middle throttle orifice and spill port oil return are to fuel tank in the middle of crossing, and needle-valve body is lifted up, and spray orifice opens oil spout；Coil blackout
Afterwards, balance valve rod is moved downward in the effect of magnetic valve back-moving spring, is crushed on intermediate mass upper surface, and spill port breaks with fuel tank
Open.
4th, when spray orifice stops oil spout, control slide block upper surface fuel pressure is higher than its lower surface, and control slide block overcomes control
The initial tension of spring of sliding block back-moving spring is opened to bottom offset, bleed off circuit, and as fuel oil enters control chamber, control slide block is in control
Under the active force of sliding block back-moving spring processed, initial position is returned to.
Advantage of the present utility model is：The utility model employs pressure accumulation cavity configuration, can substantially improve whole oil spout
The pressure oscillation of system, interfering with each other when particularly can reduce each fuel injector oil spout.Used in the utility model structure
Current limliting valve module, effectively prevent the generation of the abnormal conditions such as abnormal injection, it is ensured that the injection process of normal table it is same
When improve fuel economy and fuel injector work reliability.The utility model employs solenoid valve control balance valve rod to adjust
The switch of oil return circuit is saved, is conducive to improving the response speed and control accuracy of needle-valve there is provided flexible fuel injection characteristic, effectively
Improve the discharge stability and economy of diesel engine.The bleed off circuit of control slide block can cause control chamber more in control chamber
Pressure is rapidly built, needle-valve response characteristic is improved.The design of control slide block throttle orifice and middle throttle orifice ensure that fuel injector exists
Initial stage can slow oil spout, the formation of reduction nitrogen oxides.The utility model employs ditch structure, according to wanting for actual condition
Ask, match diameter, depth and the number of ditch, it is improved the stability of hole flow, reduce the effect of fuel injector cavitation pitting degree
Fruit is optimal.It is the hydro-cushion of needle valve assembly partial interior, 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 present utility model；
Fig. 2 is the schematic diagram of the utility model current limliting valve module；
Fig. 3 is the schematic diagram of the utility model electromagnetic valve component；
Fig. 4 is the schematic diagram of the utility model needle valve assembly；
Fig. 5 is A-A views；
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 bypass type electric-controlled fuel injector with ditch of the utility model includes injector head 1, current limliting
Valve module 3, electromagnetic valve component 5, needle valve assembly 6, nozzle 7, needle seating 9, tight cap 10, oil injector body 11.Injector head 1 passes through spiral shell
Line be connected and is arranged on oil injector body 11, and is sealed by the sealing ring 2 being placed on oil injector body 11.Spray
Main fuel feed hole 13 is set in oily device first 1, and connected with the pressure accumulation chamber 12 in oil injector body 11.The lower section of pressure accumulation chamber 12 is provided with flow-limiting valve
Component 3.Current limliting valve module 3 is arranged on inside oil injector body 11, and its primary structure includes back-up ring 14, damping spring 15, ball valve
17th, support and control sliding block 18, ball valve back-moving spring 21, ball valve return spring holder 22, current limliting piston 23, limit spring seat 25.Its
In, metering hole 16 and piston blind hole 24 are processed on current limliting piston 23, and axial central through hole 19 is processed in support and control sliding block
On 18, this ensure that fuel oil can smoothly flow to lower section oil circuit.The lower section of oil injector body 11 is sequentially provided with electromagnetic valve component 5, pin
Valve module 6 and needle seating 9, three carry out assembly connection by tight cap 10.The primary structure of electromagnetic valve component 5 includes magnetic valve and answered
Position spring base 26, coil 27, armature 28, valve seat 29, intermediate mass 32, balance valve rod 34, electromagnet 35, magnetic valve back-moving spring
36.Armature 28 and the balance combination of valve rod 34 are arranged on inside valve seat 29.Spill port 30, middle oil circuit 31, middle throttle orifice 33 add
Work is inside intermediate mass 32, and intermediate mass 32 is with needle-valve stop collar 42 and the formation control chamber 43 of needle-valve body 40.The lower section of electromagnetic valve component 5
Needle valve assembly 6, primary structure include control slide block 44, needle-valve stop collar 42, control slide block back-moving spring 39, needle-valve body 40,
Needle-valve back-moving spring 41.Control slide block 44 is placed in control chamber 43, is machined with meter in hole 46, control slide block through hole 38 and side
Logical oil circuit 37.Meter in hole 46 is connected with the fuel feed hole 45 on needle-valve stop collar 42.Needle-valve body 40 is arranged on needle seating 9
It is interior, oil holding slot 8 is set between needle seating 9 and needle-valve body 40.Spray orifice 47 is processed on needle seating 9, the surface of needle-valve body 40 sets micron
The ditch 48 of levels deep.
Have on injector head 1 and pressure accumulation chamber 12 is provided with main fuel feed hole 13, oil injector body 11, pressure accumulation chamber 12 and main fuel feed hole
13 are connected.Injector head 1 is assembled with oil injector body 11 by threaded line, and sealing ring 2 is sealed the two.Work as conveying
When the high pressure fuel come in is entered inside fuel injector by main fuel feed hole 13, the fuel oil flowed through in pressure accumulation chamber 12 can be downwards by limit
Flow valve module 3.Fuel oil flows through descending high-pressure oil passage 4 after the outflow of current limliting valve module 3 and enters control chamber 44 and oil holding slot 8.Current limliting
Electromagnetic valve component 5 and needle valve assembly 6 are equipped with successively between the lower section of valve module 3 and the top of needle seating 9.In electromagnetic valve component 5,
Armature 28 is controlled by electromagnetic force and lifting and taking a seat for valve rod 34 is balanced.When coil 27 is powered, balance valve rod 34 is upward
Lift, spill port 30 is opened, the intermediate fuel oil of control chamber 43 flows through control slide block through hole 38, middle oil circuit 31 and middle throttle orifice 33,
Pass through the draining of spill port 30.Therefore the fuel pressure of control chamber 43 declines, with the formation fuel oil pressure difference of 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 42 plays a part of limiting the displacement of needle-valve body 40.Control slide block through hole
38 and middle throttle orifice 33 two sections of throttlings presence, it is ensured that the middle fuel pressure of oil circuit 31 will not decline rapidly, and this is just
It slow down the decrease speed of the fuel pressure of control chamber 43.When coil 27 is powered off, when balance valve rod 34 is taken a seat downwards, oil return
Hole 30 is closed, and fuel oil can be directly entered control chamber 43 by fuel feed hole 45 and meter in hole 46 so that control chamber 43 builds pressure, pin
Valve body 40 is taken a seat, and injection process terminates.Needle-valve body 40 is arranged on inside needle seating 9, and is compressed by needle-valve back-moving spring 41.Needle-valve
Seat 9 and electromagnetic valve component 5 are all arranged on inside tight cap 10, and are fastened by oil injector body 11 and threaded line.Inside needle valve assembly 6
It is hydro-cushion, poor without static pressure, realize function of the fuel injector without static leakage.
Fig. 2 is the utility model flow-limiting valve components structural representation.It by back-up ring 14, damping spring 15, ball valve 17,
Support and control sliding block 18, ball valve back-moving spring 21, ball valve return spring holder 22, current limliting piston 23, limit spring seat 25 etc. are constituted.
Current limliting valve module 3 is arranged on inside oil injector body 11 by pressure accumulation chamber 12.Back-up ring 14 is not only served to overall current limliting valve module 3
Position-limiting action, and coordinated with limit spring seat 25, on the one hand as the spring base of damping spring 15, on the other hand limit
The maximum displacement of current limliting piston 23.Under the initial tension of spring effect of damping spring 15 and ball valve back-moving spring 21, ball valve 17
Coordinate with the lower surface of current limliting piston 23 and the upper surface of support and control sliding block 18.Ball valve return spring holder 22 resets bullet in ball valve
Under the spring-force driven dual of spring 21, bottom is pressed in, the face of taking a seat of ball valve 17 is formed at its top variable cross-section.High pressure fuel passes through
The piston blind hole 24 that pressure accumulation chamber 12 enters in current limliting piston 23, flows through metering hole 16 and enters in the axial direction of support and control sliding block 18
Heart through hole 19.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 47 sprays
Go out fuel oil so that the fuel pressure in transition oil pocket 20 declines.Due to throttling action of the metering hole 16 to fuel oil so that current limliting is lived
Fuel pressure rise in piston blind hole 24 and pressure accumulation chamber 12 in plug 23, pressure difference is formed with the fuel pressure of transition oil pocket 20,
Therefore current limliting piston 23, ball valve 17 and the three of support and control sliding block 18 are overall to bottom offset, this just enters to the fuel oil that fuel injector sprays
Certain compensation is gone, but not ball valve 17 is landed on ball valve return spring holder 22.When oil spout is stopped, with
Fuel oil flows through metering hole 16, and the pressure difference of the upper and lower surface of current limliting piston 23 can be gradually reduced, in the presence of ball valve back-moving spring 21,
Current limliting piston 23, ball valve 17 and the three of support and control sliding block 18 return to initial position again.When the continual injection of spray orifice 47
Fuel oil, the fuel oil quality of outflow exceedes threshold value so that when abnormal operation occurs in fuel injector, the lower section transition of current limliting piston 23
The oil pressure of oil pocket 20 declines rapidly, pressure difference above and below formation, causes current limliting piston 23 to compress ball valve 17 and is landed in ball valve back-moving spring
On seat 22, fuel oil is prevented to continue to circulate.Due to having cut off fuel delivery, fuel injector is stopped, and this just drops to a certain extent
The occurrence of low abnormal injection, improve the stability of fuel economy and fuel injector work.
Fig. 3 is the utility model electromagnetic valve component part-structure schematic diagram.It is by magnetic valve return spring holder 26, coil
27th, armature 28, valve seat 29, intermediate mass 32, balance valve rod 34, electromagnet 35, magnetic valve back-moving spring 36 etc. are constituted.Magnetic valve is answered
Position spring base 26, magnetic valve back-moving spring 36, coil 27 and electromagnet 35 are built in inside oil injector body 11, and wherein magnetic valve is answered
Position spring base 26 is by screw threads for fastening in magnetic valve top.Magnetic valve back-moving spring 36 is in magnetic valve return spring holder 26 and rank
Therebetween, armature 28 and balance valve rod 34 are arranged on inside the valve seat 29 of the lower section of oil injector body 11 iron 28.Intermediate mass 32 is in
The lower section of valve seat 29.When fuel injector commencement of fuel injection, coil 27 is powered, and with electromagnet 35 and the formation magnetic loop of armature 28, produces electricity
Magnetic force, attracts balance valve rod 34 to move upwards, the spill port 30 in intermediate mass 32 is opened.At this moment, the combustion in control chamber 43
Oil is by middle oil circuit 31, middle throttle orifice 33 and the oil return of spill port 30 to fuel tank, and oil pressure declines in control chamber 43, needle-valve body 40
Upper surface, which is pressurized, to be reduced, the fuel pressure formation pressure difference with oil holding slot 8.Under differential pressure action, needle-valve body 40 is lifted up, spray orifice
47 open oil spout.When fuel injector stops oil spout, coil 27 is powered off, because armature 28 is combined closely as one with balance valve rod 34
Body, therefore the initial tension of spring effect that they are jointly subjected to magnetic valve back-moving spring 36 is moved downward, and it is pressed in intermediate mass 32
On upper surface, and spill port 30 is blocked.At the same time, fuel feed hole 45 in control slide block 44, the oil-feed of meter in hole 46.
Fig. 4 is the utility model needle valve assembly part-structure schematic diagram.It is by control slide block back-moving spring 39, needle-valve body
40th, needle-valve back-moving spring 41, needle-valve stop collar 42 and control slide block 44 etc. are constituted.Control slide block 44 is placed with control chamber 43,
Control slide block back-moving spring 39 is by the jack-up of control slide block 44 and abuts against the lower surface of intermediate mass 32.It is machined with control slide block 44
Bleed off circuit 37, control slide block through hole 38 and meter in hole 46.When fuel injection beginning, the middle throttle orifice on intermediate mass 32
33 and control slide block through hole 38 two sections of throttling actions under, fuel pressure in control chamber 43 declines more normal fuel injector and more delayed
Slowly, the discharge of nitrogen oxides is reduced.When end of injection, because the upper surface fuel pressure of control slide block 44 is higher than lower surface,
Control slide block 44 overcomes the initial tension of spring of control slide block back-moving spring 39 to bottom offset, and bleed off circuit 37 is opened, control chamber 43
The rapid foundation of interior fuel pressure, improves needle-valve and takes a seat response.As fuel oil enters control chamber 43, control slide block is about 44
The pressure difference of end face can be less and less.Control slide block 44 is returned to initial position by the active force of control slide block back-moving spring 39.
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.
Fig. 6 is nozzle segment structural representation.It is made up of spray orifice 47 and ditch 48.It is close in the motion process of needle-valve body 40
Seal the conical surface to open, fuel oil flows to spray orifice 47 from oil holding slot 8 by sealing cone, ditch 48.Ditch 48 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 47 is increased, is reduced
Hole is come into being degree, is stabilized the flowing of the inner cavity of spray orifice 7, be slow down the fluctuation of distributive value, reduce cavitation pitting degree in hole.
From the above-mentioned course of work, a kind of injection process of the bypass type electric-controlled fuel injector with ditch of the utility model
In, the control slide block through hole 38 and bleed off circuit 37 of the processing in control chamber 43 realize injection Initial Injection Rate relatively low
With end of injection can quick oil-break the characteristics of.Oil injector body 11 built with current limliting valve module 3, effectively prevent abnormal spray
The lasting progress of oil condition, it is ensured that the stability and fuel economy of the course of work.Whole injection process uses magnetic valve control
System, using motion of the electromagnetic force with acting balancing valve bar, is realized to injection process fast response time, control accuracy is high, variable spray
The requirement of fuel oil meter rule.The ditch 48 that the surface of needle-valve body 40 is set, effectively improves the stability of hole flow, reduces fuel injector
Cavitation pitting degree.When the utility model is applied on common rail system, under big oil mass spray regime, using the structure energy of pressure accumulation chamber 12
Common rail pressure fluctuation is effectively reduced, so that the uniformity and stability that reduce each cylinder injection process decline the generation of phenomenon.
Claims (9)
1. a kind of bypass type electric-controlled fuel injector with ditch, it is characterized in that：Including injector head, oil injector body, current limliting valve group
Part, electromagnetic valve component, needle valve assembly, needle seating, nozzle, descending high-pressure oil passage, injector head are arranged on above oil injector body, spray
Set inside oily device head and pressure accumulation chamber is set inside main fuel feed hole, oil injector body, main fuel feed hole is communicated with pressure accumulation chamber, current limliting valve module
It is arranged in pressure accumulation chamber, electromagnetic valve component, needle valve assembly, needle seating, nozzle are installed in oil injector body lower end successively, tight cap is located at electricity
Electromagnetic valve component, needle valve assembly, outside needle seating, mode and oil injector body bottom phase that the upper end of tight cap is connected through a screw thread
Even；
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 axial central through hole be set in piston blind hole and metering hole, support and control sliding block, ball valve return spring holder with below
Transition oil pocket, piston blind hole connection pressure accumulation chamber and metering hole are set between oil injector body, and metering hole is with axial central through hole in ball
Connect or disconnect under the control of valve, axial central through hole is connected with 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
Spill port, middle throttle orifice, middle oil circuit are set in seat lower section, intermediate mass, and middle oil circuit is communicated with middle throttle orifice, spill port
Connect or disconnect 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 communication intermediate cavity, descending high-pressure oil passage upper end connection transition oil pocket, through oil injector body, valve seat, intermediate mass,
Needle-valve stop collar, needle seating connection oil holding slot, fuel feed hole connect descending high-pressure oil passage.
2. a kind of bypass type electric-controlled fuel injector with ditch according to claim 1, it is characterized in that：The ditch is specific
Between the sealing cone formed when being taken a seat positioned at long needle-valve and needle-valve body bottom, the number of ditch is the integer of nozzle hole number
Times, the depth of ditch is micron order.
3. a kind of bypass type electric-controlled fuel injector with ditch according to claim 1 or 2, it is characterized in that：Spray orifice oil spout
When, the fuel pressure of transition oil pocket declines, and current limliting piston, ball valve, support and control sliding block entirety are not taken a seat to bottom offset, and ball valve
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, limit
Stream piston compresses ball valve and it is seated at ball valve return spring holder, and metering hole disconnects with axial central through hole；Spray orifice stops spray
When oily, in the presence of ball valve back-moving spring, current limliting piston, ball valve and support and control sliding block integrally return to initial position.
4. a kind of bypass type electric-controlled fuel injector with ditch according to claim 1 or 2, it is characterized in that：Coil electricity
When, balance valve rod is moved upwards, and spill port and fuel tank are that the fuel oil in connected state, control chamber passes through middle oil circuit, middle node
Discharge orifice and spill port oil return are to fuel tank, and needle-valve body is lifted up, and spray orifice opens oil spout；After coil blackout, balance valve rod is in electromagnetism
The effect of valve back-moving spring is moved downward, and is crushed on intermediate mass upper surface, and spill port disconnects with fuel tank.
5. a kind of bypass type electric-controlled fuel injector with ditch according to claim 3, it is characterized in that：During coil electricity,
Balance valve rod is moved upwards, and spill port and fuel tank are that the fuel oil in connected state, control chamber passes through middle oil circuit, middle throttle orifice
With 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 multiple in magnetic valve
The effect of position spring is moved downward, and is crushed on intermediate mass upper surface, and spill port disconnects with fuel tank.
6. a kind of bypass type electric-controlled fuel injector with ditch according to claim 1 or 2, it is characterized in that：Spray orifice stops
During oil spout, control slide block upper surface fuel pressure is higher than its lower surface, and control slide block overcomes the spring of control slide block back-moving spring
Pretightning force is to bottom offset, and bleed off circuit is opened, as fuel oil enters control chamber, work of the control slide block in control slide block back-moving spring
Under firmly, initial position is returned to.
7. a kind of bypass type electric-controlled fuel injector with ditch according to claim 3, it is characterized in that：Spray orifice stops oil spout
When, control slide block upper surface fuel pressure is higher than its lower surface, and control slide block overcomes the spring pre-tightening of control slide block back-moving spring
Power is to bottom offset, and bleed off circuit is opened, as fuel oil enters control chamber, active force of the control slide block in control slide block back-moving spring
Under, return to initial position.
8. a kind of bypass type electric-controlled fuel injector with ditch according to claim 4, it is characterized in that：Spray orifice stops oil spout
When, control slide block upper surface fuel pressure is higher than its lower surface, and control slide block overcomes the spring pre-tightening of control slide block back-moving spring
Power is to bottom offset, and bleed off circuit is opened, as fuel oil enters control chamber, active force of the control slide block in control slide block back-moving spring
Under, return to initial position.
9. a kind of bypass type electric-controlled fuel injector with ditch according to claim 5, it is characterized in that：Spray orifice stops oil spout
When, control slide block upper surface fuel pressure is higher than its lower surface, and control slide block overcomes the spring pre-tightening of control slide block back-moving spring
Power is to bottom offset, and bleed off circuit is opened, as fuel oil enters control chamber, active force of the control slide block in control slide block back-moving spring
Under, return to initial position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720056737.4U CN206352542U (en) | 2017-01-18 | 2017-01-18 | A kind of bypass type electric-controlled fuel injector with ditch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720056737.4U CN206352542U (en) | 2017-01-18 | 2017-01-18 | A kind of bypass type electric-controlled fuel injector with ditch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206352542U true CN206352542U (en) | 2017-07-25 |
Family
ID=59349685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720056737.4U Active CN206352542U (en) | 2017-01-18 | 2017-01-18 | A kind of bypass type electric-controlled fuel injector with ditch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206352542U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762280A (en) * | 2017-01-18 | 2017-05-31 | 哈尔滨工程大学 | A kind of bypass type electric-controlled fuel injector with ditch |
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- 2017-01-18 CN CN201720056737.4U patent/CN206352542U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762280A (en) * | 2017-01-18 | 2017-05-31 | 哈尔滨工程大学 | A kind of bypass type electric-controlled fuel injector with ditch |
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