CN206608265U - Pressure accumulation orifice-plate type electric-controlled fuel injector - Google Patents
Pressure accumulation orifice-plate type electric-controlled fuel injector Download PDFInfo
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- CN206608265U CN206608265U CN201720080552.7U CN201720080552U CN206608265U CN 206608265 U CN206608265 U CN 206608265U CN 201720080552 U CN201720080552 U CN 201720080552U CN 206608265 U CN206608265 U CN 206608265U
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Abstract
The purpose of this utility model is to provide pressure accumulation orifice-plate type electric-controlled fuel injector, including injector head, oil injector body, current limliting valve module, electromagnetic valve component, needle valve assembly etc..Pressure accumulation chamber is provided with 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.Current limliting valve module is arranged on below pressure accumulation chamber, it is to avoid the abnormal progress for continuing oil spout.Oil injector body bottom processing electromagnetic valve component drives stem movement by electromagnetic force, can realize flexible Injection strategy and the injection process that response is fast, control accuracy is high.By orifice throttle hole, the two-way oil-feed of annular side oil circuit, accelerate building for control chamber and press through journey, improve the response speed that needle-valve is taken a seat.The AND DEWATERING FOR ORIFICE STRUCTURE of processing, efficiently reduces the dynamic recirculating oil quantity in injection process, the characteristics of realizing On Fluctuations oil return in needle valve assembly.Nozzle segment internal hydraulic pressure balance, it is poor without static pressure, realize function of the fuel injector without static leakage.
Description
Technical field
The utility model relates to a kind of engine fueling injection equipment, specifically high-pressure common rail oil injection device.
Background technology
Start progressively to use high speed electromagnetic valve type fuel injector in the market to adapt to newest Abgasgesetz.It is this automatically controlled
The characteristics of fuel injector is protruded is the electric signal control high-speed electromagnetic valve exported using ECU, to realize flexible oil spout rule
Rule.Using the fuel injector of high-speed electromagnetic valve, its faster system response, control accuracy is high, the ability with multi-injection.But this electricity
Controlling fuel injector, there is also area for improvement：In injection process, there is high pressure fuel always and flow through into and out of oily throttle orifice.
This partial high pressure fuel oil is pressurizeed by oil pump, is not done work but and is returned directly to fuel tank, and dynamic recirculating oil quantity is big, causes energy to damage
Lose.
The content of the invention
The purpose of this utility model is to provide achievable On Fluctuations oil return, and needle-valve response characteristic is protruded and without static leakage
The pressure accumulation orifice-plate type electric-controlled fuel injector of function.
What the purpose of this utility model was realized in：
The utility model pressure accumulation orifice-plate type electric-controlled fuel injector, it is characterized in that：Including injector head, oil injector body, flow-limiting valve
Component, electromagnetic valve component, needle valve assembly, descending high-pressure oil passage, injector head are arranged on above oil injector body, inside injector head
Set and pressure accumulation chamber is set inside main fuel feed hole, oil injector body, main fuel feed hole is communicated with pressure accumulation chamber, and current limliting valve module is arranged on pressure accumulation
In 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, outside needle valve assembly,
The mode that the upper end of tight cap is connected through a screw thread is connected with oil injector body bottom；
The current limliting valve module includes limit spring seat, current limliting piston, ball valve return spring holder, support and control sliding block, limit
Position spring base, current limliting piston, ball valve return spring holder are arranged 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 oil circuit, descending fuel feed hole be set below valve seat, in intermediate mass, spill port under the control of balance valve rod with
Fuel tank is connected or disconnected；
The needle valve assembly includes needle-valve stop collar, orifice plate, needle-valve body, nozzle, and needle-valve stop collar is located in nozzle, orifice plate
In needle-valve stop collar, the upper part of needle-valve body is located in needle-valve stop collar, and the lower part of needle-valve body is located in nozzle, orifice plate
Formed between needle-valve body and bossing, lug boss are set in the middle part of providing holes sheet reset spring in control chamber, control chamber, needle-valve body
Divide and needle-valve back-moving spring be 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, and throttle orifice is respectively communicated with low pressure port and control chamber, high-pressure mouth connects descending fuel feed hole in orifice plate, orifice plate with 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 connects 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 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.
2nd, 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, spill port oil return to fuel tank in the middle of crossing, needle-valve body are lifted up, and spray orifice opens oil spout；After coil blackout, balance valve rod exists
The effect of magnetic valve back-moving spring is moved downward, and is crushed on intermediate mass upper surface, and spill port disconnects with fuel tank.
Advantage of the present utility model is：The utility model employs the structure of the built-in section plate of 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.The utility model employs pressure accumulation cavity configuration, can substantially improve the pressure oscillation of whole injection system, particularly
Interfering with each other when can reduce each fuel injector oil spout.Current limliting valve module is employed in the utility model structure, is prevented effectively from
The generation of the abnormal conditions such as abnormal injection, it is ensured that while the injection process of normal table improve fuel economy and spray
The reliability of oily device work.The utility model balances valve rod to adjust the switch of oil return circuit by solenoid valve control, is conducive to
The response speed and control accuracy of needle-valve are improved there is provided flexible fuel injection characteristic, the discharge for effectively improving diesel engine is steady
Qualitative and economy.Nozzle segment internal hydraulic pressure balance, it is 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 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 pressure accumulation orifice-plate type electric-controlled fuel injector includes injector head 1, current limliting valve module 3, electricity
Electromagnetic valve component 5, needle valve assembly 6, tight cap 9, oil injector body 10.Injector head 1, which by screw thread be connected, is arranged on oil spout
On body 10, and sealed by the sealing ring 2 being placed on oil injector body 10.Main fuel feed hole 12 is set in injector head 1,
And connected with the pressure accumulation chamber 11 in oil injector body 10.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, it is multiple that its primary structure includes back-up ring 13, damping spring 14, ball valve 16, support and control sliding block 17, ball valve
Position spring 20, ball valve return spring holder 21, current limliting piston 22, limit spring seat 24.Wherein, metering hole 15 and piston blind hole 23
Processing is on current limliting piston 22, and axial central through hole 18 is processed on support and control sliding block 17, this ensure that fuel oil can be suitable
Profit flow direction lower section oil circuit.The lower section of oil injector body 10 is sequentially provided with electromagnetic valve component 5, needle valve assembly 6, is assembled by tight cap 9
Connection.The primary structure of electromagnetic valve component 5 includes magnetic valve return spring holder 25, coil 26, armature 27, valve seat 28, intermediate mass
32nd, balance valve rod 33, electromagnet 34, magnetic valve back-moving spring 35.Armature 27 and the balance combination of valve rod 33 are arranged in valve seat 28
Portion.The processing such as spill port 29, descending fuel feed hole 30, middle oil circuit 31 are inside intermediate mass 32.Needle-valve positioned at fuel injector bottom
The primary structure of component 6 includes orifice plate 37, orifice plate back-moving spring 38, needle-valve stop collar 39, needle-valve body 40, nozzle 41, needle-valve and resetted
Spring 42.Intermediate mass 32 is with needle-valve stop collar 39 and the formation control chamber 43 of needle-valve body 40.Orifice plate 37 is positioned in control chamber 43.Pin
Valve body 40 is arranged in nozzle 41, and the upper end of needle-valve body 40 for being cased with needle-valve back-moving spring 42 is arranged in needle chamber, needle-valve body
Oil holding slot 8 is set between 40 and nozzle 41.
Fig. 1 is to be provided with the overall structure diagram of the utility model pressure accumulation orifice-plate type electric-controlled fuel injector, oil injector body 10
Pressure accumulation chamber 11, pressure accumulation chamber 11 is connected with the main fuel feed hole 12 on injector head 1.Oil pocket passes sequentially through piston in current limliting piston 22
Blind hole 23 and the metering hole 15 being opened in thereon are connected with pressure accumulation chamber 11.Injector head 1 is entered with oil injector body 10 by threaded line
Luggage is matched somebody with somebody, and sealing ring 2 is sealed the two.When the high pressure fuel that conveying is come in is entered inside fuel injector by main fuel feed hole 12
When, current limliting valve module 3 can be passed through downwards by the fuel oil in pressure accumulation chamber 11.Fuel oil flows through descending after the outflow of current limliting valve module 3
High-pressure oil passage 4 enters control chamber 43 and oil holding slot 8.The lower section of oil injector body 10 has been sequentially arranged electromagnetic valve component 5, needle valve assembly 6.
In electromagnetic valve component 5, armature 27 is controlled by electromagnetic force and lifting and taking a seat for valve rod 33 is balanced.When coil 26 is powered
When, balance valve rod 33 is lifted up, and spill port 29 is opened, and the intermediate fuel oil of control chamber 43 flows through throttle orifice 44 and middle oil circuit successively
31, pass through the draining of spill port 29.Therefore the fuel pressure of control chamber 43 declines, with pressure initiation fuel oil pressure difference in oil holding slot 8 so that
Needle-valve body 40 is lifted, fuel injection beginning.During being somebody's turn to do, needle-valve stop collar 39 plays a part of limiting the displacement of needle-valve body 40.Coil
During 26 power-off, balance valve rod 33 is downwards when taking a seat, and spill port 29 is closed, and fuel oil enters side downstream by descending fuel feed hole 30
High-pressure mouth 36, high-pressure mouth 36 surrounds circular low pressure port 46 in the rear surface of intermediate mass 32 one annular oil groove of formation.Annular oil
The oil pressure of groove and the high pressure fuel in circular low pressure port 46 and oil pressure formation pressure difference in control chamber 43 so that orifice plate 37 overcomes orifice plate
The spring force of back-moving spring 38 is moved downward, and opens the side oil circuit 45 of orifice plate 37.Flow through middle oil circuit 31 and descending oil-feed
The high pressure fuel in hole 30 quickly enters control chamber 43 by annular side oil circuit 45 and the two-way of throttle orifice 44, and quickly sets up oil
Pressure so that needle-valve body 40 is taken a seat, so as to terminate injection process.Needle-valve body 40 is arranged on inside nozzle 41, and resets bullet by needle-valve
Spring 42 is compressed.Nozzle 41 and electromagnetic valve component 5 are all arranged on inside tight cap 9, and are fastened by oil injector body 10 and threaded line.Spray
The internal hydraulic pressure of mouth 41 balance, it is 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 constituted.
Current limliting valve module 3 is arranged on inside oil injector body 10 by pressure accumulation chamber 11.Back-up ring 13 is not only served to overall current limliting valve module 3
Position-limiting action, and coordinated with limit spring seat 24, on the one hand as the spring base of damping spring 14, on the other hand limit
The maximum displacement of current limliting piston 22.Under the initial tension of spring effect 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.Due to throttling action of the metering hole 15 to 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 that fuel injector sprays
Certain compensation, but not ball valve 16 is landed on ball valve return spring holder 21.When oil spout is stopped, with combustion
Oil flows through 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 exceedes threshold value so that when abnormal operation occurs in fuel injector, the lower section bridging oil of current limliting piston 22
The oil pressure of chamber 19 declines rapidly, pressure difference above and below formation, 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 32, balance valve rod 33, electromagnet 34, magnetic valve back-moving spring 35 etc. are constituted.Magnetic valve is answered
Position spring base 25, coil 26, electromagnet 34 and magnetic valve back-moving spring 35 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 35 is in magnetic valve return spring holder 25 and armature
27 therebetween, and armature 27 and balance valve rod 33 are set inside the valve seat 28 of the lower section of oil injector body 10.At intermediate mass 32
In the lower section of valve seat 28.When fuel injector commencement of fuel injection, coil 26 is powered, and with armature 27 and the formation magnetic loop of electromagnet 34, produces
Electromagnetic force, attracts balance valve rod 33 to move up, the spill port 29 in intermediate mass 32 is opened.At this moment, the fuel oil in control chamber 43
Middle oil circuit 31 and the oil return of spill port 29 are passed sequentially through to fuel tank, the fuel pressure of control chamber 43 declines, the upper surface of needle-valve body 40
It is pressurized and reduces, with the fuel pressure formation pressure difference in oil holding slot 8.Needle-valve body 40 is lifted up, and opens the oil spout of spray orifice 7.Work as oil spout
When device stops oil spout, coil 26 is powered off, and because armature 34 is closely as one with balance valve rod 33, therefore they are jointly subjected to electricity
The initial tension of spring effect of magnet valve back-moving spring 25 is moved downward, and is pressed on the upper surface of intermediate mass 32, and has been blocked time
Oilhole 29.The descending oil-feed of fuel feed hole 30 in intermediate mass 32, enters lower section needle valve assembly.
Fig. 4 is the utility model needle valve assembly part-structure schematic diagram.The primary structure of needle valve assembly 5 includes orifice plate 37, hole
Sheet reset spring 38, needle-valve stop collar 39, needle-valve body 40, nozzle 41, needle-valve back-moving spring 42.Before fuel injection beginning, whole control
Chamber 43 processed is to be in hydrodynamic equilibrium state, is each filled with high pressure fuel.And orifice plate 37 is due to by the spring pre-tightening of orifice plate back-moving spring 38
The effect of power blocks high-pressure mouth 36 by jack-up.When coil 26 is powered, after the balance valve rod 33 of magnetic valve is lifted, spill port 29
Open.The throttle orifice 44 and middle oil circuit 31 that fuel oil in control chamber 43 is flowed through on orifice plate 37 successively carry out oil return.With control
The fuel pressure of chamber 43 declines, and needle-valve body 40 overcomes the initial tension of spring of needle-valve back-moving spring 42 to be lifted up, commencement of fuel injection.
In injection process, the presence of throttle orifice 44 make it that the fuel pressure in control chamber 43 is higher than the fuel pressure in middle oil circuit 31,
The making a concerted effort of its pressure difference value and spring force it is enough to overcome the fuel pressure in the annular oil groove of the formation of high-pressure mouth 36, so,
Orifice plate 37 is pressed on the lower surface of intermediate mass 32 always, has blocked the annular oil groove that descending fuel feed hole 30 enters side downstream,
The entrance of high pressure fuel is prevented, the high pressure fuel amount that low-pressure reservoir is flowed back in injection process is effectively reduced.When coil 26
Power-off, after the balance valve rod 33 of magnetic valve is taken a seat, spill port 29 is plugged.Because oil pressure is higher than middle oil circuit 31 in control chamber 43
Oil pressure, in the presence of pressure difference, fuel oil is back in middle oil circuit 31 in control chamber 43, and the middle fuel pressure of oil circuit 31 rises
Until pressure difference zero.The inner high voltage fuel oil of high-pressure mouth 36 is with the fuel pressure formation pressure difference in control chamber 43 so that orifice plate 37 overcomes
The initial tension of spring of orifice plate back-moving spring 39, orifice plate 37 moves down opening, at the same time, the peripheral circular side oil circuit 45 dozens of orifice plate 37
Open.High pressure fuel flows through descending fuel feed hole 30, enters control chamber 43, control by throttle orifice 44 and the two-way of annular side oil circuit 45
Oil pressure is quickly set up in chamber 43, and needle-valve is taken a seat rapidly, and oil spout stops.
Fig. 5 is the section A-A enlarged drawing of needle-valve body 40.Its arcwall face can be very good to play guide effect.
In the above-mentioned course of work, the injection process of the utility model pressure accumulation orifice-plate type electric-controlled fuel injector, it is built in
The structure of orifice plate 37 in needle valve assembly 6, substantially reduces the dynamic recirculating oil quantity in injection process, it is ensured that the spy of On Fluctuations oil return
Point.By the two-way oil-feed of the throttle orifice 44, annular side oil circuit 45 of orifice plate 37, accelerate building for control chamber 43 and press through journey, carry
The response speed that high needle-valve is taken a seat.In addition, oil injector body 10 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 33, is realized to injection process fast response time, control accuracy is high, variable
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, so that the uniformity and stability that reduce each cylinder injection process decline the hair of phenomenon
It is raw.
Claims (3)
1. pressure accumulation orifice-plate type electric-controlled fuel injector, it is characterized in that：Including injector head, oil injector body, current limliting valve module, solenoid valve block
Part, needle valve assembly, descending high-pressure oil passage, injector head are arranged on above oil injector body, and main fuel feed hole is set inside injector head,
Pressure accumulation chamber is set inside oil injector body, and main fuel feed hole is communicated with pressure accumulation chamber, and current limliting valve module is arranged in pressure accumulation chamber, oil injector body
Electromagnetic valve component, needle valve assembly are installed in lower end successively, and tight cap is outside electromagnetic valve component, needle valve assembly, and the upper end of tight cap leads to
The mode for crossing threaded connection is connected with oil injector body bottom；
The current limliting valve module includes limit spring seat, current limliting piston, ball valve return spring holder, support and control sliding block, spacing bullet
Spring abutment, current limliting piston, ball valve return spring holder are arranged 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
Seat lower section, sets spill port, middle oil circuit, descending fuel feed hole in intermediate mass, spill port under the control of balance valve rod with fuel tank
Connection disconnects；
The needle valve assembly includes needle-valve stop collar, orifice plate, needle-valve body, nozzle, and needle-valve stop collar is located in nozzle, and orifice plate is located at
In needle-valve stop collar, the upper part of needle-valve body is located in needle-valve stop collar, and the lower part of needle-valve body is located in nozzle, orifice plate and pin
Form providing holes sheet reset spring in control chamber, control chamber between valve body, bossing be set 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 connects descending high-pressure oil passage.
2. pressure accumulation orifice-plate type electric-controlled fuel injector according to claim 1, it is characterized in that：During spray orifice oil spout, transition oil pocket
Fuel pressure declines, and current limliting piston, ball valve, support and control sliding block are overall to bottom offset, and ball valve is not landed in ball valve reset bullet
On spring abutment, metering hole is communicated with axial central through hole；When the fuel oil quality that spray orifice flows out exceedes threshold value, current limliting piston compresses ball
Valve simultaneously makes it be seated at ball valve return spring holder, and metering hole disconnects with axial central through hole；It is multiple in ball valve when spray orifice stops oil spout
In the presence of the spring of position, current limliting piston, ball valve and support and control sliding block integrally return to initial position.
3. pressure accumulation orifice-plate type electric-controlled fuel injector according to claim 1 or 2, it is characterized in that：During coil electricity, valve rod is balanced
Motion upwards, spill port and fuel tank be fuel oil in connected state, control chamber by middle oil circuit, spill port oil return to fuel tank,
Needle-valve body is lifted up, and spray orifice opens oil spout；After coil blackout, balance valve rod is transported downwards in the effect of magnetic valve back-moving spring
It is dynamic, it is crushed on intermediate mass upper surface, spill port disconnects with fuel tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720080552.7U CN206608265U (en) | 2017-01-18 | 2017-01-18 | Pressure accumulation orifice-plate type electric-controlled fuel injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720080552.7U CN206608265U (en) | 2017-01-18 | 2017-01-18 | Pressure accumulation orifice-plate type electric-controlled fuel injector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206608265U true CN206608265U (en) | 2017-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720080552.7U Active CN206608265U (en) | 2017-01-18 | 2017-01-18 | Pressure accumulation orifice-plate type electric-controlled fuel injector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762289A (en) * | 2017-01-18 | 2017-05-31 | 哈尔滨工程大学 | Pressure accumulation orifice-plate type electric-controlled fuel injector |
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- 2017-01-18 CN CN201720080552.7U patent/CN206608265U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762289A (en) * | 2017-01-18 | 2017-05-31 | 哈尔滨工程大学 | Pressure accumulation orifice-plate type electric-controlled fuel injector |
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