CN206625925U - A kind of pressure accumulation orifice-plate type electric-controlled fuel injector with hydraulic feedback - Google Patents
A kind of pressure accumulation orifice-plate type electric-controlled fuel injector with hydraulic feedback Download PDFInfo
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- CN206625925U CN206625925U CN201720057302.1U CN201720057302U CN206625925U CN 206625925 U CN206625925 U CN 206625925U CN 201720057302 U CN201720057302 U CN 201720057302U CN 206625925 U CN206625925 U CN 206625925U
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Abstract
The purpose of this utility model is to provide a kind of pressure accumulation orifice-plate type electric-controlled fuel injector with hydraulic feedback, including injector head, oil injector body, current limliting valve module, electromagnetic valve component, needle valve assembly, etc. part.Pressure accumulation chamber is provided with oil injector body, is connected with main fuel feed hole with current limliting valve module, when ensureing big pulsewidth oil spout, the stabilization of each cylinder injection process.Current limliting valve module is arranged on below pressure accumulation chamber, avoids the abnormal progress for continuing oil spout.The addition of electromagnetic valve component internal feedback oil circuit, slow down the unlatching of needle-valve, accelerate taking a seat for needle-valve.And the two-way oil-feed in the orifice throttle hole, annular side oil circuit in needle valve assembly, further speed up building for control chamber and pressed through journey, the response speed that needle-valve is taken a seat greatly improved.The AND DEWATERING FOR ORIFICE STRUCTURE of processing, effectively reduces the dynamic recirculating oil quantity in injection process in needle valve assembly, the characteristics of realizing On Fluctuations oil return.Nozzle segment internal hydraulic pressure balances, is poor without static pressure, realizes function of the fuel injector without static leakage.
Description
Technical field
The utility model relates to a kind of engine fueling injection equipment, specifically high-pressure common rail oil injection device.
Background technology
With the fuel consumption and emission characteristic requirements more and more higher to engine, the limitation of discharge essentially consists in nitrogen oxygen
Two aspects of compound and particulate matter.In order to reduce the discharge of nitrogen oxides, it is desirable 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 closing velocity of needle-valve 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.In addition, in injection process, high compression ignition always be present
Oil stream is passed through into and out of oily throttle orifice.This partial high pressure fuel oil is pressurizeed by oil pump, is but returned directly to fuel tank without acting, dynamic
Recirculating oil quantity is big, causes energy loss.
The content of the invention
The purpose of this utility model is to provide achievable On Fluctuations oil return, build that pressure is rapid, needle-valve response characteristic is prominent and
A kind of pressure accumulation orifice-plate type electric-controlled fuel injector with hydraulic feedback without static leakage function.
What the purpose of this utility model was realized in：
A kind of pressure accumulation orifice-plate type electric-controlled fuel injector with hydraulic feedback of the utility model, it is characterized in that：Including injector head,
Oil injector body, current limliting valve module, electromagnetic valve component, needle valve assembly, descending high-pressure oil passage, injector head are arranged on oil injector body
Side, injector head inside set main fuel feed hole, set pressure accumulation chamber inside oil injector body, main fuel feed hole communicates with pressure accumulation chamber, current limliting
Valve module is arranged in pressure accumulation chamber, and electromagnetic valve component, needle valve assembly, nozzle are installed in oil injector body lower end successively, and tight cap is positioned at electricity
Electromagnetic valve component, needle valve assembly, nozzle exterior, the mode that the upper end of tight cap is connected through a screw thread are connected with oil injector body bottom；
The current limliting valve module includes limit spring seat, current limliting piston, ball valve return spring holder, support and control sliding block, limit
Position spring base, current limliting piston, ball valve return spring holder are arranged from top to bottom, and damping is installed between limit spring seat and current limliting piston
Spring, support and control sliding block are arranged in ball valve return spring holder, set between the upper end of support and control sliding block and current limliting piston
Mounting ball valve back-moving spring between ball valve, the lower end of support and control sliding block and ball valve return spring holder below, current limliting piston
In piston blind hole and metering hole are set, axial central through hole is set in support and control sliding block, ball valve return spring holder with below
Oil injector body between transition oil pocket, piston blind hole connection pressure accumulation chamber and metering hole are set, metering hole exists with axial central through hole
Connect or disconnect under the control of ball valve, axial centre leads to through hole transition oil pocket；
The electromagnetic valve component includes electromagnet, coil, armature, balance valve rod, valve seat, intermediate mass, is wound on electromagnet
Coil, electromagnet top set magnetic valve return spring holder, armature, armature and magnetic valve return spring holder are set below electromagnet
Between set magnetic valve back-moving spring, balance valve rod be located in valve seat, balance valve rod upper end be connected with armature, intermediate mass setting
Below valve seat, formation balance valve-rod cavity between bottom, valve seat and the intermediate mass of valve rod is balanced, oil return is set in intermediate mass
Hole, middle oil circuit, lower shape fuel feed hole, feedback oil circuit, middle oil circuit, feedback oil circuit are respectively communicated with balance valve-rod cavity, and spill port exists
Balance and connect or disconnect with middle oil circuit and fuel tank under the control of valve rod；
The needle valve assembly includes needle-valve stop collar, orifice plate, needle-valve body, nozzle, and needle-valve stop collar is located in nozzle, orifice plate
In needle-valve stop collar, the upper part of needle-valve body is located in needle-valve stop collar, and the lower part of needle-valve body is located in nozzle, orifice plate
Form control chamber between needle-valve body, providing holes sheet reset spring in control chamber, bossing, lug boss are set in the middle part of needle-valve body
To divide and needle-valve back-moving spring is set between the needle-valve stop collar above it, the upper surface of orifice plate sets low pressure port, high-pressure mouth respectively,
Throttle orifice is set in orifice plate, throttle orifice is respectively communicated with low pressure port and control chamber, and high-pressure mouth connects descending fuel feed hole, orifice plate with outside it
Side oil circuit is formed between the needle-valve stop collar in portion, oil holding slot is formed between needle-valve body and nozzle, nozzle-end sets spray orifice；
Middle oil communication low pressure port, descending high-pressure oil passage upper end connection transition oil pocket, through oil injector body, valve seat, in
Between block, nozzle connection oil holding slot, descending fuel feed hole and feedback oil circuit be respectively communicated with descending high-pressure oil passage.
The utility model can also include：
1st, during spray orifice oil spout, the fuel pressure of transition oil pocket declines, current limliting piston, ball valve, support and control sliding block it is overall to
Bottom offset, and ball valve is not landed on ball valve return spring holder, metering hole communicates with axial central through hole；When the combustion of spray orifice outflow
When oil quality exceedes threshold value, current limliting piston compresses ball valve and it is seated at ball valve return spring holder, metering hole and axial centre
Through hole disconnects；When spray orifice stops oil spout, in the presence of ball valve back-moving spring, current limliting piston, ball valve and support and control sliding block are whole
Body returns to initial position.
2nd, during coil electricity, balance valve rod moves upwards, and spill port and fuel tank are connected state, and the fuel oil in control chamber leads to
Oil circuit and spill port oil return to fuel tank, needle-valve body are lifted up among crossing, and spray orifice opens oil spout；After coil blackout, valve rod is balanced
Move downward, be crushed on intermediate mass upper surface in the effect of magnetic valve back-moving spring, spill port disconnects with fuel tank.
Advantage of the present utility model is：The utility model employs the structure of orifice plate built in control chamber.This orifice plate
Structure can significantly decrease the dynamic recirculating oil quantity of injection process intermediate fuel oil, significantly reduce energy loss, improve system
Economy.Hydraulic feedback oil circuit is added inside the intermediate mass of electromagnetic valve component, it has connected high-pressure oil passage and middle oil circuit,
So that needle-valve can also make system build while opening slow, pressure is rapid, improves the seating velocity of needle-valve, controls fuel injector energy
It is enough quickly to terminate oil spout.The utility model employs pressure accumulation cavity configuration, can substantially improve the pressure oscillation of whole injection system,
Interfering with each other when can particularly reduce each fuel injector oil spout.Current limliting valve module is employed in the utility model structure, is had
Effect avoids the generations of the abnormal conditions such as abnormal injection, improves fuel-economy while the injection process for ensureing normal table
Property and fuel injector work reliability.Nozzle segment internal hydraulic pressure balances, is poor without static pressure, realizes fuel injector and is let out without static state
The function of 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 views.
Embodiment
Illustrate below in conjunction with the accompanying drawings and the utility model is described in more detail：
With reference to Fig. 1-5, the utility model include injector head 1, current limliting valve module 3, electromagnetic valve component 5, needle valve assembly 6,
Tight cap 9, oil injector body 10.Injector head 1 by screw thread be connected and is arranged on oil injector body 10, and by being placed on
Sealing ring 2 on oil injector body 10 is sealed.Main fuel feed hole 12 is set in injector head 1, and with the storage in oil injector body 10
Pressure chamber 11 connects.The lower section of pressure accumulation chamber 11 is provided with current limliting valve module 3.Current limliting valve module 3 is arranged on inside oil injector body 10, and its is main
Structure includes back-up ring 13, damping spring 14, ball valve 16, support and control sliding block 17, ball valve back-moving spring 20, ball valve back-moving spring
Seat 21, current limliting piston 22, limit spring seat 24.Wherein, metering hole 15 and piston blind hole 23 are processed on current limliting piston 22, axle
Processed to central through hole 18 on support and control sliding block 17, this ensure that fuel oil can smoothly flow to lower section oil circuit.Fuel injector
The lower section of body 10 is sequentially provided with electromagnetic valve component 5, needle valve assembly 6, and assembly connection is carried out by tight cap 9.Electromagnetic valve component 5 is mainly tied
Structure include magnetic valve return spring holder 25, coil 26, armature 27, valve seat 28, intermediate mass 33, balance valve rod 34, electromagnet 35,
Magnetic valve back-moving spring 36.Armature 27 and the balance combination of valve rod 34 are arranged on inside valve seat 28.Feed back oil circuit 29, spill port 30,
Descending fuel feed hole 31, middle oil circuit 32 etc. are processed inside intermediate mass 33.The primary structure of needle valve assembly 6 positioned at fuel injector bottom
Including orifice plate 38, orifice plate back-moving spring 39, needle-valve stop collar 40, needle-valve body 41, nozzle 42, needle-valve back-moving spring 43.Intermediate mass
33 form control chamber 44 with needle-valve stop collar 40 and needle-valve body 41.Orifice plate 38 is positioned in control chamber 44.Needle-valve body 41 is arranged on
In nozzle 42, the upper end of needle-valve body 41 for being cased with needle-valve back-moving spring 43 is arranged in needle chamber, needle-valve body 41 and nozzle 42 it
Between set oil holding slot 8.
Fig. 1 is a kind of overall structure diagram of the pressure accumulation orifice-plate type electric-controlled fuel injector with hydraulic feedback of the utility model,
Pressure accumulation chamber 11 is provided with oil injector body 10, pressure accumulation chamber 11 is connected with the main fuel feed hole 12 on injector head 1.In current limliting piston 22
The metering hole 15 that oil pocket passes sequentially through piston blind hole 23 and is opened in thereon is connected with pressure accumulation chamber 11.Injector head 1 and fuel injector
Body 10 is assembled by threaded line, and sealing ring 2 is sealed the two.When the high pressure fuel that conveying is come in passes through main fuel feed hole
When inside 12 entrance fuel injectors, current limliting valve module 3 can be passed through downwards by the fuel oil in pressure accumulation chamber 11.Fuel oil is from current limliting valve module
Descending high-pressure oil passage 4, which is flowed through, after 3 outflows enters control chamber 44 and oil holding slot 8.The lower section of oil injector body 10 has been sequentially arranged magnetic valve
Component 5, needle valve assembly 6.In electromagnetic valve component 5, armature 27 is controlled by electromagnetic force and balances lifting and falling for valve rod 34
Seat.When coil 26 is powered, balance valve rod 34 is lifted up, and spill port 30 is opened, and the intermediate fuel oil of control chamber 44 flows through throttling successively
The middle oil circuit 32 in hole 45, passes through the draining of spill port 30.Therefore the fuel pressure of control chamber 44 declines, with pressure initiation in oil holding slot 8
Fuel oil pressure difference so that needle-valve body 41 lifts, fuel injection beginning.During being somebody's turn to do, needle-valve stop collar 40 plays the position of limitation needle-valve body 41
The effect of shifting.When coil 26 powers off, when balance valve rod 34 is taken a seat downwards, spill port 30 is closed.A part of fuel oil is by feeding back oil
Road 29 flows through balance valve rod 34, middle oil circuit 32 is entering the throttle orifice 45 in needle valve assembly 6；Another part fuel oil is under
Traveling oilhole 31 enters the high-pressure mouth 37 of side downstream, and high-pressure mouth 37 forms an annular oil groove in the rear surface of intermediate mass 33,
Surround circular low pressure port 47.Because the oil-feed for feeding back oil circuit 29 raises the oil pressure of circular low pressure port 47, annular oil groove and circle
The oil pressure of high pressure fuel in shape low pressure port 47 forms pressure difference with oil pressure in control chamber 44 so that orifice plate 38 overcomes orifice plate to reset bullet
The spring force of spring 39 moves downward, and opens the side oil circuit 46 of orifice plate 38.Flow through middle oil circuit 32 and descending fuel feed hole 31
High pressure fuel quickly enters control chamber 44 by annular side oil circuit 46 and the two-way of throttle orifice 45, and quickly establishes oil pressure so that
Needle-valve body 41 is taken a seat, so as to terminate injection process.Needle-valve body 41 is arranged on inside nozzle 42, and is pressed by needle-valve back-moving spring 43
Tightly.Nozzle 42 and electromagnetic valve component 5 are all arranged on inside tight cap 9, and are fastened by oil injector body 10 and threaded line.In nozzle 42
It is portion's 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 13, damping spring 14, ball valve 16,
Support and control sliding block 17, ball valve back-moving spring 20, ball valve return spring holder 21, current limliting piston 22, limit spring seat 24 etc. are formed.
Current limliting valve module 3 is arranged on inside oil injector body 10 by pressure accumulation chamber 11.Back-up ring 13 not only serves to overall current limliting valve module 3
Position-limiting action, and coordinated with limit spring seat 24, on the one hand the spring base as damping spring 14, is on the other hand limited
The maximum displacement of current limliting piston 22.Under the effect of the initial tension of spring of damping spring 14 and ball valve back-moving spring 20, ball valve 16
Coordinate with the lower surface of current limliting piston 22 and the upper surface of support and control sliding block 17.Ball valve return spring holder 21 resets bullet in ball valve
Under the spring-force driven dual of spring 20, bottom is pressed in, the face of taking a seat of ball valve 16 is formed at its top variable cross-section.High pressure fuel passes through
The piston blind hole 23 that pressure accumulation chamber 11 enters in current limliting piston 22, flows through metering hole 15 and enters in the axial direction of support and control sliding block 17
Heart through hole 18.The fuel oil of outflow leads to lower section oil circuit by descending high-pressure oil passage 4.When fuel injector normal work, spray orifice 7 sprays
Fuel oil so that the fuel pressure in transition oil pocket 19 declines.Because metering hole 15 is to the throttling action of fuel oil so that current limliting piston
Fuel pressure rise in piston blind hole 23 and pressure accumulation chamber 11 in 22, pressure difference is formed with the fuel pressure of transition oil pocket 19, therefore
Current limliting piston 22, ball valve 16 and the three of support and control sliding block 17 are overall to bottom offset, and this is just carried out to the fuel oil of fuel injector injection
Certain compensation, but not ball valve 16 is landed on ball valve return spring holder 21.When oil spout is stopped, with combustion
Oil stream crosses metering hole 15, and the pressure difference of the upper and lower surface of current limliting piston 22 can be gradually reduced, in the presence of ball valve back-moving spring 20, limit
Stream piston 22, ball valve 16 and the three of support and control sliding block 17 return to initial position again.When the continual injection combustion of spray orifice 7
Oil, the fuel oil quality of outflow exceed threshold value so that when there is abnormal operation in fuel injector, the lower section bridging oil of current limliting piston 22
The oil pressure of chamber 19 declines rapidly, forms pressure difference up and down, causes current limliting piston 22 to compress ball valve 16 and is landed in ball valve return spring holder
On 21, fuel oil is prevented to continue to circulate.Due to having cut off fuel delivery, fuel injector is stopped, and this is just reduced to a certain extent
The occurrence of abnormal injection, improve the stability of fuel economy and fuel injector work.
Fig. 3 is the utility model electromagnetic valve component part-structure schematic diagram.It is by magnetic valve return spring holder 25, coil
26th, armature 27, valve seat 28, intermediate mass 33, balance valve rod 34, electromagnet 35, magnetic valve back-moving spring 36 etc. are formed.Magnetic valve is answered
Position spring base 25, coil 26, electromagnet 35 and magnetic valve back-moving spring 36 are built in oil injector body 10, and wherein magnetic valve resets
Spring base 25 is by screw threads for fastening in magnetic valve top.Magnetic valve back-moving spring 36 is in magnetic valve return spring holder 25 and armature
27 therebetween, and armature 27 and balance valve rod 34 are arranged on inside the valve seat 28 of the lower section of oil injector body 10.Intermediate mass 33 is in valve
The lower section of seat 28.When fuel injector commencement of fuel injection, coil 26 is powered, and forms magnetic loop with armature 27 and electromagnet 35, produces electromagnetism
Power, balance valve rod 34 is attracted to move up, the spill port 30 in intermediate mass 33 is opened.At this moment, the fuel oil in control chamber 44 is successively
By middle oil circuit 32 and the oil return of spill port 30 to fuel tank, due to the throttling action of middle oil circuit 32, the internal combustion oil pressure of control chamber 44
Power declines more slowly, and the upper surface of needle-valve body 41, which is pressurized, to be reduced, and pressure difference is formed with the fuel pressure in oil holding slot 8.Under differential pressure action,
Needle-valve body 41 slowly lifts upwards, and spray orifice 7 opens oil spout.When fuel injector stops oil spout, coil 26 powers off, due to the He of armature 27
Balance valve rod 34 is closely as one, therefore the initial tension of spring effect that they are jointly subjected to magnetic valve back-moving spring 36 is transported downwards
It is dynamic, and be pressed on the upper surface of intermediate mass 33, and blocked spill port 30.At the same time, there is two-way oil-feed in intermediate mass 33,
It is to flow through the middle entrance of oil circuit 32 lower section needle valve assembly by feeding back oil circuit 29 all the way；Another way is straight by descending fuel feed hole 31
Tap into lower section oil circuit.In whole injection process, there is high pressure fuel to enter top oil pocket by feeding back oil circuit 29 always, reduce
The oil pressure fall off rate of control chamber 44 so that the pressure drop at oil spout initial stage of control chamber 44, which diminishes, to slow down, and reduces nitrogen oxides
Produce；And in end of injection, normal single fuel feed hole is improved to the voltage built-up rate of control chamber 44, improves taking a seat for needle-valve
Speed, and optimize needle-valve response speed.
Fig. 4 is the utility model needle valve assembly part-structure schematic diagram.The primary structure of needle valve assembly 5 includes orifice plate 38, hole
Sheet reset spring 39, needle-valve stop collar 40, needle-valve body 41, nozzle 42, needle-valve back-moving spring 43.Before fuel injection beginning, whole control
Chamber 44 processed is to be in hydrodynamic equilibrium state, is each filled with high pressure fuel.And orifice plate 38 is due to by the spring pre-tightening of orifice plate back-moving spring 39
The effect of power is jacked up, and blocks high-pressure mouth 37.When coil 26 is powered, after the balance valve rod 34 of magnetic valve lifts, spill port 30
Open.Fuel oil in control chamber 44 flows through throttle orifice 45 and the progress oil return of middle oil circuit 32 on orifice plate 38 successively.With control
The fuel pressure of chamber 44 declines, and needle-valve body 41 overcomes the initial tension of spring of needle-valve back-moving spring 43 to be lifted up, commencement of fuel injection.
In injection process, the presence of throttle orifice 45 make it that the fuel pressure in control chamber 44 is higher than the fuel pressure in middle oil circuit 32,
Fuel pressure in the annular oil groove for making a concerted effort to be enough to overcome high-pressure mouth 37 to be formed of its pressure difference value and spring force, so,
Orifice plate 38 is pressed on the lower surface of intermediate mass 33 always, has blocked the annular oil groove that descending fuel feed hole 31 enters side downstream,
The entrance of high pressure fuel is prevented, effectively reduces the high pressure fuel amount that low-pressure reservoir is flowed back in injection process.When coil 26
Power-off, after the balance valve rod 34 of magnetic valve is taken a seat, spill port 30 is plugged.Oil circuit 29 is fed back due to existing, by feeding back oil circuit
29 high pressure fuels entered cause the oil pressure of middle oil circuit 32 to rise until orifice plate 38 is opened.The inner high voltage fuel oil of high-pressure mouth 37 is the same as control
Fuel pressure in chamber 44 processed forms pressure difference so that orifice plate 38 overcomes the initial tension of spring of orifice plate back-moving spring 39, under orifice plate 38
Move and open, at the same time, the peripheral circular side oil circuit 46 of orifice plate 38 is opened.High pressure fuel flows through descending fuel feed hole 31 all the way, and one
Road flows through feedback oil circuit 29, middle oil circuit 32 successively, finally all enters control by throttle orifice 45 and the two-way of annular side oil circuit 46
Chamber 44 processed, oil pressure is quickly established in control chamber 44, and needle-valve is taken a seat rapidly, and oil spout stops.
Fig. 5 is the section A-A enlarged drawing of needle-valve body 41.Its arcwall face can be very good to play guide effect.
From the above-mentioned course of work, a kind of spray of the pressure accumulation orifice-plate type electric-controlled fuel injector with hydraulic feedback of the utility model
During oil, the structure of orifice plate 38 that is built in needle valve assembly 6 substantially reduces the dynamic recirculating oil quantity in injection process, ensures
The characteristics of On Fluctuations oil returns.Pass through the internal feedback oil circuit 29 of electromagnetic valve component 5, the two-way oil-feed of descending fuel feed hole 31 and needle-valve
The two-way oil-feed of the throttle orifice 45, annular side oil circuit 46 of the orifice plate 38 of component 6, greatly improved building for control chamber 44 and presses through journey,
Improve the response speed that needle-valve is taken a seat.In addition, oil injector body 10 built with current limliting valve module 3, effectively prevent exception
The lasting progress of oil spout state, ensure that the stability and fuel economy of the course of work.Whole injection process uses magnetic valve
Control, using motion of the electromagnetic force with acting balancing valve bar 34, realize to injection process fast response time, control accuracy is high, can
Become the requirement of fuel injection characteristic.When the utility model is applied on common rail system, under big oil mass spray regime, using pressure accumulation chamber 11
Structure can effectively reduce common rail pressure fluctuation, decline phenomenon so as to reduce the uniformity of each cylinder injection process and stability
Occur.
Claims (3)
1. a kind of pressure accumulation orifice-plate type electric-controlled fuel injector with hydraulic feedback, it is characterized in that：Including injector head, oil injector body, limit
Valve module, electromagnetic valve component, needle valve assembly, descending high-pressure oil passage are flowed, injector head is arranged on above oil injector body, injector head
Inside sets main fuel feed hole, sets pressure accumulation chamber inside oil injector body, main fuel feed hole is communicated with pressure accumulation chamber, and current limliting valve module is arranged on
In pressure accumulation chamber, electromagnetic valve component, needle valve assembly are installed in oil injector body lower end successively, and tight cap is located at electromagnetic valve component, needle valve assembly
Outside, the mode that the upper end of tight cap is connected through a screw thread are connected with oil injector body bottom；
The current limliting valve module includes limit spring seat, current limliting piston, ball valve return spring holder, support and control sliding block, 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 are 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
Mounting ball valve back-moving spring between valve, the lower end of support and control sliding block and ball valve return spring holder below, in current limliting piston
Piston blind hole and metering hole are set, axial central through hole are set in support and control sliding block, ball valve return spring holder with below
Transition oil pocket, 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 centre leads to through hole transition oil pocket；
The electromagnetic valve component includes electromagnet, coil, armature, balance valve rod, valve seat, intermediate mass, wound around coil on electromagnet,
Magnetic valve return spring holder is set above electromagnet, armature is set below 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, balance and balance valve-rod cavity formed between bottom, valve seat and the intermediate mass of valve rod, set in intermediate mass spill port,
Middle oil circuit, lower shape fuel feed hole, feedback oil circuit, middle oil circuit, feedback oil circuit are respectively communicated with balance valve-rod cavity, and spill port is balancing
Connect or disconnect with middle oil circuit and fuel tank under the control of valve rod；
The needle valve assembly includes needle-valve stop collar, orifice plate, needle-valve body, nozzle, and needle-valve stop collar is located in nozzle, and orifice plate is located at
In needle-valve stop collar, the upper part of needle-valve body is located in needle-valve stop collar, and the lower part of needle-valve body is located in nozzle, orifice plate and pin
Form control chamber between valve body, providing holes sheet reset spring in control chamber sets bossing in the middle part of needle-valve body, bossing with
Needle-valve back-moving spring is set between the needle-valve stop collar above it, and the upper surface of orifice plate sets low pressure port, high-pressure mouth, orifice plate respectively
In throttle orifice is set, throttle orifice is respectively communicated with low pressure port and control chamber, and high-pressure mouth connects descending fuel feed hole, and orifice plate is outside with it
Side oil circuit is formed between needle-valve stop collar, oil holding slot is formed between needle-valve body and nozzle, nozzle-end sets spray orifice；
Middle oil communication low pressure port, descending high-pressure oil passage upper end connection transition oil pocket, through oil injector body, valve seat, intermediate mass,
Nozzle connects oil holding slot, and descending fuel feed hole and feedback oil circuit are respectively communicated with descending high-pressure oil passage.
2. a kind of pressure accumulation orifice-plate type electric-controlled fuel injector with hydraulic feedback according to claim 1, it is characterized in that：Spray orifice sprays
When oily, the fuel pressure of transition oil pocket declines, and current limliting piston, ball valve, support and control sliding block are overall to bottom offset, and ball valve does not fall
On ball valve return spring holder, metering hole communicates seat with axial central through hole；When the fuel oil quality of spray orifice outflow exceedes threshold value,
Current limliting piston compresses ball valve and it is seated at ball valve return spring holder, and metering hole disconnects with axial central through hole；Spray orifice stops
During oil spout, in the presence of ball valve back-moving spring, current limliting piston, ball valve and support and control sliding block integrally return to initial position.
3. a kind of pressure accumulation orifice-plate type electric-controlled fuel injector with hydraulic feedback according to claim 1 or 2, it is characterized in that：Line
When circle is powered, balance valve rod moves upwards, and spill port and fuel tank be connected state, the fuel oil in control chamber by middle oil circuit 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 resets in magnetic valve
The effect of spring moves downward, and is crushed on intermediate mass upper surface, and spill port disconnects with fuel tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720057302.1U CN206625925U (en) | 2017-01-18 | 2017-01-18 | A kind of pressure accumulation orifice-plate type electric-controlled fuel injector with hydraulic feedback |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720057302.1U CN206625925U (en) | 2017-01-18 | 2017-01-18 | A kind of pressure accumulation orifice-plate type electric-controlled fuel injector with hydraulic feedback |
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| Publication Number | Publication Date |
|---|---|
| CN206625925U true CN206625925U (en) | 2017-11-10 |
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ID=60212449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720057302.1U Withdrawn - After Issue CN206625925U (en) | 2017-01-18 | 2017-01-18 | A kind of pressure accumulation orifice-plate type electric-controlled fuel injector with hydraulic feedback |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762288A (en) * | 2017-01-18 | 2017-05-31 | 哈尔滨工程大学 | A kind of pressure accumulation orifice-plate type electric-controlled fuel injector with hydraulic feedback |
| CN114623028A (en) * | 2022-02-24 | 2022-06-14 | 哈尔滨工程大学 | High-pressure common rail oil sprayer capable of reducing pressure fluctuation |
-
2017
- 2017-01-18 CN CN201720057302.1U patent/CN206625925U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762288A (en) * | 2017-01-18 | 2017-05-31 | 哈尔滨工程大学 | A kind of pressure accumulation orifice-plate type electric-controlled fuel injector with hydraulic feedback |
| CN114623028A (en) * | 2022-02-24 | 2022-06-14 | 哈尔滨工程大学 | High-pressure common rail oil sprayer capable of reducing pressure fluctuation |
| CN114623028B (en) * | 2022-02-24 | 2023-02-14 | 哈尔滨工程大学 | High-pressure common rail oil sprayer capable of reducing pressure fluctuation |
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