CN106762290B - A kind of low pressure oil duct fuel injection valve - Google Patents
A kind of low pressure oil duct fuel injection valve Download PDFInfo
- Publication number
- CN106762290B CN106762290B CN201611153148.4A CN201611153148A CN106762290B CN 106762290 B CN106762290 B CN 106762290B CN 201611153148 A CN201611153148 A CN 201611153148A CN 106762290 B CN106762290 B CN 106762290B
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- Prior art keywords
- valve seat
- oil
- control valve
- electromagnet
- armature
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1853—Orifice plates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
- F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
Abstract
The present invention relates to a kind of fuel injection valves, are particularly used in the high-pressure common-rail injection system of diesel engine, will be ejected into cylinder of diesel engine from the high pressure fuel of high pressure pressure accumulation chamber, belong to engine fuel injection valve technology field.It includes control valve group, electromagnet assembly, the very tight cap of electromagnetism, electromagnet spring, restricting orifice, oil injector body, control piston and mandril, is equipped with restricting orifice in the restricting orifice room of oil injector body, restricting orifice is located at control valve seat bottom.The oil injector body drainback passage and main oil return hole mutually staggered is equipped in oil injector body, main oil return hole upper end connects restricting orifice room.Present invention optimizes the low pressure oil way systems of fuel injection valve, method by the way that electromagnetic actuator will be led in the lower static oil return of temperature, effectively electromagnet assembly is cooled down, at the same electromagnet will be accumulated in by the flowing of oil return, a large amount of deleterious bubbles in armature chamber take oil injector body out of.
Description
Technical field
The present invention relates to a kind of fuel injection valves, are particularly used for the high-pressure common-rail injection system of diesel engine
In, it will be ejected into cylinder of diesel engine from the high pressure fuel of high pressure pressure accumulation chamber, belong to engine fuel injection valve technology neck
Domain.
Background technique
In order to meet increasingly strict emission regulation, high-pressure common rail has become the key technology of diesel energy conservation and emissions reduction,
As the core component in Common-rail technology, electric-controlled fuel injector needs to further increase its reliability, stability, accuracy of spray and sound
Answer speed.As the control unit of fuel injector, electromagnetic actuator needs to work under power on condition for a long time, this leads to electromagnet
It is constantly in the condition of high temperature, excessively high temperature can make the material aging of electromagnet assembly, and reliability, durability reduce, finally
The injection of stablizing of fuel injector is directly influenced, and then influences engine performance.In addition, due in course of injection mesohigh oil from hole
When plate fuel-displaced throttle orifice is released, rapid pressure drop, can gasify great amount of fuel oil bubble out, if cannot be discharged in time, these gas
It steeps oneself-meeting and is free between electromagnet and armature, the movement of armature is interfered, accuracy of spray is influenced.
In order to carry out bubble that is effectively cooling, and being discharged in armature chamber in time to electromagnet, in CN103423049A
In disclosed injector assembly, electromagnetism will be led in the dynamic oil return released in control chamber by devising a set of low pressure oil way circulation
Iron, then be imported into the oil return hole of oil injector body by the duct of electromagnet, it is discharged together with static oil return.
As shown in Figure 1, the fuel injection valve in CN103423049A includes control valve group, electromagnet assembly, electromagnet
The very tight cap 6 of spring 7, electromagnetism, steel ball 11, restricting orifice 13, oil injector body 15, control piston 17, mandril 39, pressure spring, spray
Nozzle component etc..Control valve group is mounted in the cavity on 15 top of oil injector body, and control valve group includes control valve seat 1, rank
Iron 2 and armature lever 4.1 center of control valve seat is equipped with valve seat orifice, and 4 lower end of armature lever is placed in valve seat orifice and is axially movable.
Electromagnet assembly is mounted on above control valve group, electromagnet assembly include electromagnet casing 28, iron core valve seat 26, iron core 23,
Coil 9, binding post 25 etc..Electromagnet assembly is connect by the very tight cap 6 of electromagnetism with 15 upper end of oil injector body, the electromagnetism in iron core 23
Iron spring 7 is connect with 4 upper end of armature lever in control valve group, and the outer peripheral surface of electromagnet casing 23 cuts with several uniformly distributed put down
Face, there are gaps 21 when so that the very tight cap 6 of electromagnetism being tightened with oil injector body 15.23 lower end surface of electromagnet core and fuel injector
Body is provided with adjustment ring 10 between 15 upper surface.The control valve seat 1 is installed in the cavity of 15 upper end of oil injector body, throttle orifice
The high-pressure oil duct 16 that plate 13 is arranged on 1 bottom of control valve seat, restricting orifice oil inlet 14 and oil injector body 15 is connected to, throttle orifice
Steel ball 11 is set on plate oil outlet 12.Control piston 17 is arranged in the axial piston chamber 33 in oil injector body 15, restricting orifice
Oil inlet 14 and restricting orifice oil outlet 12 are connected to the control chamber 32 of 33 upper end of axial piston chamber simultaneously.The control valve seat 1
Upper plane is provided with a through-hole 35 obliquely, which can introduce armature for the dynamic oil return that orifice plate fuel-displaced throttle orifice 12 is released
In room 11.Armature lever 4 penetrates in the centre bore of armature 2, is provided with three uniformly distributed through-holes 29 in the plane of armature 2, outside electromagnet
It is provided with small inclined hole 22,24 on shell 28 and iron core valve seat 26, it is very tight with electromagnet spring cavity 27, electromagnet casing 28 and electromagnetism respectively
The gap 21 of cap 6 is connected to.The upper surface of oil injector body 15 is provided with a dynamic oil return inclined hole 34, which leads directly on oil injector body 15
In the cavity in portion, oil return which lets out under can be used for accepting in the gap 21 from electromagnet casing 28 and the very tight cap 6 of electromagnetism.Spray
Oily 15 top cavity baseplane edge of body is provided with oil return hole 18, and oil return hole 18 is communicated with the radial through-hole 36 of lower end, radial hole
36 one end are connected with plunger shaft 33, and one end is directly communicated to outside fuel injector.
The trend of prior art low pressure oil way are as follows: after electromagnet is powered, armature 2 is by Attraction strap moving armature bar 4, steel ball 11
It moves, the high pressure oil controlled in plunger shaft is released from fuel-displaced throttle orifice 12, is entered in armature chamber 30 through control valve oil outlet 35, then
Armature through-hole 29 is flowed through, enters electromagnet spring cavity 27 along the gap between armature 2 and electromagnet, through oblique on iron core valve seat 26
Hole 24 enters electromagnet, then is flowed out by the inclined hole 22 on electromagnet casing 28, passes through electromagnet casing 28 and the very tight cap 6 of electromagnetism
Gap 21 enter oil injector body upper surface dynamic oil return inclined hole 34, under leak into the cavity on 15 top of oil injector body, immediately into
Become owner of in oil return hole 18 be released into static oil return in control plunger shaft 33 and converge in radial through-hole 36, flow out oil spout together
Device.
As shown in Fig. 2, the specific flow direction of the dynamic oil return in low pressure oil way circulation in the prior art is A-B-C-
D-E-F-G-H-I, dynamic oil return finally converge at fuel injector radial through-hole 36 with static oil return J, flow to the external world together.
To draw in dynamic oil return in the program can cool down electromagnet, meanwhile, it can will be produced using the mobility of oil return
Raw bubble is taken out of from electromagnet.This structure can alleviate a part of thermic load of electromagnet and effectively draw bubble
Oil injector body, so that fuel injector has part to be promoted in reliability and stability.But take will be in dynamic oil return for the program
For the method drawn there are limitation, so-called dynamic oil return is the oil return that control valve steel ball is directly released from control chamber when opening,
Although pressure is low, temperature is higher, then being introduced into electromagnet, the cooling effect played is limited, under some operating conditions very
To also having heat effect to electromagnet；Since the oil mass of dynamic oil return is larger, generally account for 2/3rds of total recirculating oil quantity with
On, it will lead to thereon after electromagnet that channel that dynamic oil return can be made to flow is more tortuous, and apart from longer, linear loss increases, and makes
Increase at the resistance of discharge.If dynamic oil return cannot quickly be discharged, control valve steel ball controls going out for intracavitary fuel oil when opening
Speed oil can slow down, this causes the unlatching of oil spout to postpone to increase, and respond slack-off.In addition the oil return of program dynamic is from control valve side
Oilhole inject armature chamber, unidirectional impact can be caused to armature, so that its movement is generated certain disequilibrium, to influence
The accuracy of spray of fuel injector.
Summary of the invention
It is an object of the present invention to overcome the above deficiencies, so that a kind of low pressure oil duct fuel injection valve is provided, it can
Electromagnetic actuator is given adequately to cool down, and a large amount of bubbles generated when dynamic oil return is released can timely and effectively be discharged, together
When avoid interference of the sound state oil return to moving component, to improve the reliability of fuel injection valve, stability, and injection
Response speed.
According to technical solution provided by the invention, a kind of low pressure oil duct fuel injection valve includes control valve group, electromagnet
The very tight cap of component, electromagnetism, electromagnet spring, restricting orifice, oil injector body, control piston and mandril, the top of oil injector body are recessed
Intracavitary to be equipped with control valve group, control valve group includes control valve seat, armature, damping spring and armature lever, control valve seat center
Equipped with valve seat orifice, armature lever lower end is protruded into valve seat orifice and can be moved axially along valve seat orifice, and armature lever is equipped with armature, armature
Damping spring, damping spring upper-end contact armature, lower end engagement control valve seat are equipped between control valve seat；In control valve group
End is equipped with electromagnet assembly, and electromagnet assembly is connect by the very tight cap of electromagnetism with oil injector body upper end, and electromagnet assembly includes line
Circle, iron core, binding post, iron core valve seat and electromagnet casing are successively arranged binding post, iron core valve in electromagnet casing from top to bottom
Seat and iron core, core center are equipped with electromagnet spring cavity；Armature lever upper end is protruded into the electromagnet spring cavity of iron core, and is being held in the mouth
Electromagnet spring is arranged on iron, electromagnet spring cavity top is equipped with electromagnetism iron gasket, and the external peripheral surface of electromagnet casing is set
There are multiple equally distributed planes, so that when tightening there are oil return gap between the very tight cap of electromagnetism and oil injector body, iron core
Adjustment ring is equipped between lower end surface and the upper surface of oil injector body, it is characterized in that: control valve seat is by the top cavity of oil injector body
It is divided into the armature chamber for accommodating armature and accommodates the restricting orifice room of restricting orifice, is equipped with throttling in the restricting orifice room of oil injector body
Orifice plate, restricting orifice are located at control valve seat bottom；Restricting orifice lower end surface is equipped with meter in hole, and restricting orifice center is equipped with
Oily throttle orifice, oil injector body is interior to be equipped with high pressure oil input channel, and high pressure oil input channel is connected to meter in hole；It is equipped at fuel-displaced throttle orifice
Valve seal is controlled, control valve seal being capable of movable sealing fuel-displaced throttle orifice；Oil injector body center is equipped with control plunger shaft, control
The control piston that can be moved up and down is equipped in plunger shaft processed, control piston connects mandril, and the oil spout end of oil injector body connects
Connect transition block；Control valve seat lower end surface is equipped with the vertical through-hole of multiple control valve seats, and the vertical through-hole of control valve seat is by armature chamber and sprays
The restricting orifice room of oily body is connected to；The oil injector body drainback passage and main oil return hole mutually staggered is equipped in oil injector body, it is main
Oil return hole upper end connects restricting orifice room；Electromagnet casing is equipped with electromagnet casing inclined hole, and the inner sidewall of iron core valve seat is equipped with
Oil return gap is connected to by iron core valve seat inclined hole, electromagnet casing inclined hole with iron core valve seat inclined hole, iron core valve seat inclined hole and electromagnet
Spring cavity connection, armature are equipped with armature through-hole, and armature through-hole upper and lower side is respectively communicated with electromagnet spring cavity and armature chamber.
Further, armature is sleeved on armature lever.
Further, armature is integrally formed with armature lever.
Further, control valve seal is steel ball.
Further, control valve seal is flat valve, and the restricting orifice matched with flat valve is no conical surface orifice plate.
Further, oil injector body drainback passage includes the long inclined hole of static oil return and radial blind holes, the static long inclined hole of oil return
Lower end is connected to the radial blind holes on oil injector body side wall, and radial blind holes are connected to control plunger shaft, the static long inclined hole of oil return
Upper end is connected to oil return gap.
Further, radial blind holes, the long inclined hole of static oil return, oil return gap, electromagnet casing inclined hole and iron core valve seat are oblique
Hole constitutes static drainback passage, and static drainback passage is at least one.
Further, oil injector body drainback passage includes static oil return inclined hole, and static oil return inclined hole upper end opening is located at spray
Oily body is connected to oil return gap close to the end face of electromagnet, the upper end opening of static oil return inclined hole, and static oil return inclined hole lower end is opened
Mouth is located at the end face that oil injector body is contacted with transition block, is equipped in transition block on the end face that transition block is in contact with oil injector body
Groove, the lower ending opening of static oil return inclined hole are connected to transition block upper groove, transition block upper groove connection control plunger shaft.
Further, control valve seat is radially equipped with identical as the vertical number of openings of control valve seat towards restricting orifice end face
Multiple control valve seat drainage troughs, multiple control valve seat drainage troughs are uniformly distributed along control valve seat lower end surface, each control valve
Seat drainage trough is connected to a vertical through-hole of control valve seat.
Further, restricting orifice Control-oriented valve seat end face is radially equipped with identical as the vertical number of openings of control valve seat
Multiple orifice plate drainage troughs, multiple orifice plate drainage troughs along control restricting orifice upper surface be uniformly distributed, each orifice plate drainage trough
It is connected to a vertical through-hole of control valve seat.
Compared with the prior art the present invention has the advantage that
The invention has the advantages of simple structure, compactness and reasonable structure, present invention optimizes the low pressure oil way system of fuel injection valve, pass through by
The method that electromagnetic actuator is led in the lower static oil return of temperature, effectively cools down electromagnet assembly, is led to simultaneously
Cross that the flowing of oil return will accumulate in electromagnet, a large amount of deleterious bubbles in armature chamber take oil injector body out of.In addition the present invention overcomes
The big problem of dynamic oil return discharge resistance in prior art, the oil discharge passage of dynamic oil return is smooth, be able to achieve dynamic oil return
Quickly discharge, further improves the response speed of fuel injector, and last dynamic oil return is quickly discharged by autonomous closure channel, is kept away
Exempt from the disturbance to control valve movement parts, and oil discharge passage is arranged symmetrically, reduces the unilateral side impact to movement parts, it can be significant
Improve the stability of armature motion, improves accuracy of spray.
Detailed description of the invention
Fig. 1 is fuel injection valve structure chart in the prior art.
Fig. 2 is that low pressure oil way circulation moves towards figure in the prior art.
Fig. 3 is the oil inlet and oil return oil duct cross-sectional view of the embodiment of the present invention one.
Fig. 4 is the static drainback passage cross-sectional view of the embodiment of the present invention one.
Fig. 5 is the structure chart of the control valve seat in the embodiment of the present invention one.
Fig. 6 is that figure is moved towards in the static oil return of the embodiment of the present invention one.
Fig. 7 is that figure is moved towards in the dynamic oil return of the embodiment of the present invention one.
Fig. 8 is the structure chart of the embodiment of the present invention two.
Fig. 9 is the structure chart of the embodiment of the present invention three.
Figure 10 is the structure chart of the embodiment of the present invention four.
Figure 11 is the structure chart of the embodiment of the present invention five.
Figure 12 is the partial enlarged view of the embodiment of the present invention five.
Figure 13 is the structure chart of the embodiment of the present invention six.
Description of symbols: 1- control valve seat, 2- armature, 3- damping spring, 4- armature lever, 5- damping gasket, 6- electromagnetism
Very tight cap, 7- electromagnet spring, 8- electromagnetism iron gasket, 9- electromagnet coil, 10- adjustment grommet, 11- steel ball, 11a- flat valve,
12- fuel-displaced throttle orifice, 13- restricting orifice, 13a- without conical surface orifice plate, 14- meter in hole, 15- oil injector body, 16- high pressure into
Oil duct, 17- control piston, the main oil return hole of 18-, 19- radial blind holes, the first radial blind holes of 19a-, the long inclined hole of 20- static state oil return,
The long inclined hole of the static oil return of 20a- first, 21- oil return gap, the first oil return of 21a- gap, 22- electromagnet casing inclined hole, 22a- the
One electromagnet casing inclined hole, 23- iron core, 24- iron core valve seat inclined hole, 24a- the first iron core valve seat inclined hole, 25- binding post, 26- iron
Core valve seat, 27- electromagnet spring cavity, 28- electromagnet casing, 29- armature through-hole, 30- armature chamber, 31- control valve seat lead to vertically
Hole, 32- control chamber, 33- control plunger shaft, 34- dynamic oil return inclined hole, the long inclined hole of 35- control valve seat, 36- fuel injector are radially logical
Hole, 37- fuel feed hole, 38- control valve seat drainage trough, 39- mandril, 40- transition block, 41- transition block upper groove, the drainage of 42- orifice plate
Slot, 43- restricting orifice room, 44- static state oil return inclined hole.
Specific embodiment
The present invention will be further described in conjunction with the embodiment in attached drawing below:
As shown in Fig. 3 ~ 13, the invention mainly comprises control valve group, electromagnet assembly, the very tight caps 6 of electromagnetism, electromagnet bullet
Spring 7, restricting orifice 13, oil injector body 15, control piston 17 and mandril 39.
Control valve group is equipped in the top cavity of oil injector body 15, control valve group includes control valve seat 1, armature 2, resistance
Buddhist nun's spring 3 and armature lever 4,1 center of control valve seat are equipped with valve seat orifice, and 4 lower end of armature lever is protruded into valve seat orifice and can be along valve seat
Hole axial movement.Armature lever 4 is equipped with armature 2, and damping spring 3,3 upper end of damping spring are equipped between armature 2 and control valve seat 1
Contact armature 2, lower end engagement control valve seat 1.The armature 2 is sleeved on armature lever 4.
Control valve group upper end is equipped with electromagnet assembly, and electromagnet assembly passes through on the very tight cap 6 of electromagnetism and oil injector body 15
End connection.Electromagnet assembly includes coil 9, iron core 23, binding post 25, iron core valve seat 26 and electromagnet casing 28, outside electromagnet
Binding post 25, iron core valve seat 26 and iron core 23 are successively arranged in shell 28 from top to bottom, 23 center of iron core is equipped with electromagnet spring cavity
27。
4 upper end of armature lever is protruded into the electromagnet spring cavity 27 of iron core 23, and electromagnet spring is arranged on armature lever 4
7,27 top of electromagnet spring cavity is equipped with electromagnetism iron gasket 8.The external peripheral surface of electromagnet casing 28 is equipped with multiple be uniformly distributed
Plane so that when tightening, there are oil return gaps 21 between the very tight cap 6 of electromagnetism and oil injector body 15.The lower end surface of iron core 23 with
Adjustment ring 10 is equipped between the upper surface of oil injector body 15, by adjusting ring 10 can adjust on iron core 23 and armature 2 plane it
Between spacing.
The top cavity of oil injector body 15 is divided into the armature chamber 30 for accommodating armature 2 and accommodates restricting orifice by control valve seat 1
13 restricting orifice room 43.Restricting orifice 13 is equipped in the restricting orifice room 43 of oil injector body 15, restricting orifice 13 is located at control
1 bottom of valve seat.13 lower end surface of restricting orifice is equipped with meter in hole 14, and 13 center of restricting orifice is equipped with fuel-displaced throttle orifice 12.Spray
It is equipped with high pressure oil input channel 16 in oily body 15, high pressure oil input channel 16 is connected to meter in hole 14.It is equipped at fuel-displaced throttle orifice 12
Valve seal is controlled, control valve seal is the steel ball 11 for capableing of movable sealing fuel-displaced throttle orifice 12.15 center of oil injector body is set
There is control plunger shaft 33, is equipped with the control piston 17 that can be moved up and down in control plunger shaft 33.
As shown in figure 5,1 lower end surface of control valve seat is equipped with the vertical through-hole 31 of multiple control valve seats, the vertical through-hole of control valve seat
31 are connected to armature chamber 30 with the restricting orifice room 43 of oil injector body 15.Control valve seat 1 towards 13 end face of restricting orifice radially
Equipped with multiple control valve seat drainage troughs 38 identical with vertical 31 quantity of through-hole of control valve seat, multiple 38 edges of control valve seat drainage trough
1 lower end surface of control valve seat be uniformly distributed.Each control valve seat drainage trough 38 is connected to the vertical through-hole 31 of a control valve seat.
Oil injector body drainback passage is equipped in oil injector body 15, oil injector body drainback passage includes that the static state interconnected is returned
The long inclined hole 20 of oil and radial blind holes 19, static long 20 lower end of inclined hole of oil return connect with the radial blind holes 19 on 15 side wall of oil injector body
Logical, radial blind holes 19 are connected to control plunger shaft 33, and the upper end of the static long inclined hole 20 of oil return is connected to oil return gap 21.
Main oil return hole 18 is equipped in oil injector body 15, main oil return hole 18 is arranged in a staggered manner with oil injector body drainback passage, leads back
18 upper end of oilhole connects restricting orifice room 43.
Electromagnet casing 28 is equipped with electromagnet casing inclined hole 22, and the inner sidewall of iron core valve seat 26 is equipped with iron core valve seat inclined hole
24, oil return gap 21 is connected to by electromagnet casing inclined hole 22 with iron core valve seat inclined hole 24, iron core valve seat inclined hole 24 and electromagnet bullet
Spring chamber 27 is connected to.Armature 2 is equipped with armature through-hole 29, and 29 upper and lower side of armature through-hole is respectively communicated with electromagnet spring cavity 27 and armature
Room 30.
Radial blind holes 19, the long inclined hole 20 of static oil return, oil return gap 21, electromagnet casing inclined hole 22 and iron core valve seat inclined hole
24 constitute static drainback passage.
The trend of the low pressure oil way of embodiment one are as follows: after electromagnet is powered, armature 2 is by Attraction strap moving armature bar 4, steel ball 11
It moves up, the high pressure oil controlled in plunger shaft 33 is released from fuel-displaced throttle orifice 12, the control valve seat drainage trough through 1 bottom surface of control valve seat
38 flow into restricting orifice room 43, and since main oil return hole 18 directly communicates with the outside world, pressure is lower in hole, in restricting orifice room 43
Oil return is taken advantage of a situation by letting out under main oil return hole 18, and fuel injector is expelled directly out.Control plunger shaft 33 is stored in the fuel injector course of work
High pressure oil in upper chamber can enter to control plunger shaft 33 through the couple gap aerial drainage between control piston 17 and oil injector body 15
In lower cavity, static oil return is formed, static oil return enters radial blind holes 19 through leading to electromagnet on the long inclined hole 20 of static oil return
In the oil return gap 21 of shell 28 and the very tight cap 6 of electromagnetism, enter electromagnetism through the electromagnet casing inclined hole 22 on electromagnet casing 28
Iron, then enter electromagnet spring cavity 27 from the iron core valve seat inclined hole 24 on iron core valve seat 26, downward along between armature 2 and electromagnet
Gap, 2 surface of armature armature through-hole 29 enter armature chamber 30, the vertical through-hole 31 of control valve seat immediately through control valve seat 1
It is let out into restricting orifice room 43, and under main oil return hole 18, flows out fuel injector.
As shown in Fig. 6 ~ 7, the static specific flow direction of oil return is f-g-h-i-j, the flowing of dynamic oil return in embodiment one
Direction is a-b-c-d-e.
As shown in figure 8, the long inclined hole 20a of the first static oil return is equipped in embodiment two, in oil injector body 15, first static time
The oily lower end long inclined hole 20a is connected to the first radial blind holes 19a on 15 side wall of oil injector body, the first radial blind holes 19a and control
Plunger shaft 33 is connected to, and the upper end of the first long inclined hole 20a of static oil return is connected to the first oil return gap 21a.
Electromagnet casing 28 is equipped with the first electromagnet casing inclined hole 22a, and the inner sidewall of iron core valve seat 26 is equipped with the first iron
First oil return gap 21a and the first iron core valve seat inclined hole 24a is connected to by core valve seat inclined hole 24a, electromagnet casing inclined hole 22a, the
One iron core valve seat inclined hole 24a is connected to electromagnet spring cavity 27.
First radial blind holes 19a, the long inclined hole 20a of the first static state oil return, the first oil return gap 21a, the first electromagnet casing
Inclined hole 22a and the first iron core valve seat inclined hole 24a constitutes another static drainback passage, and drawing channel in the static state oil return can set
Set at least one.By increasing static drainback passage, be able to achieve by static oil return it is quick on lead to electromagnet, gas is discharged in time
Bubble, while the resistance that can also reduce oil return rising improves the response speed of fuel injector
As shown in figure 9, control valve seal is flat valve 11a, the throttling matched with flat valve 11a in embodiment three
Orifice plate 13 is no conical surface orifice plate 13a.
As shown in Figure 10, in example IV, the armature 2 is integrally formed with armature lever 4.
As shown in Figure 11 ~ 12, in embodiment five, control 17 lower end of piston connects mandril 39, the oil spout end of oil injector body 15
Connect transition block 40.Oil injector body drainback passage includes static oil return inclined hole 44, and static 44 upper end opening of oil return inclined hole is located at spray
Oily body 15 is connected to oil return gap 21, static oil return inclined hole close to the end face of electromagnet, the upper end opening of static oil return inclined hole 44
44 lower ending openings are located at the end face that oil injector body 15 is contacted with transition block 40, at the end that transition block 40 is in contact with oil injector body 15
Face is equipped with transition block upper groove 41, and the lower ending opening of static oil return inclined hole 44 is connected to transition block upper groove 41, transition block fovea superior
The connection control plunger shaft 33 of slot 41.The static oil return penetrated into control plunger shaft 33 can enter quiet through transition block upper groove 41
State oil return inclined hole 44, and then above guided to electromagnet.
As shown in figure 13, in embodiment six, 13 Control-oriented valve seat of restricting orifice, 1 end face is radially equipped with and control
The identical multiple orifice plate drainage troughs 42 of vertical 31 quantity of through-hole of valve seat, multiple orifice plate drainage troughs 42 are along on control restricting orifice 13
End face is uniformly distributed.Each orifice plate drainage trough 42 is connected to the vertical through-hole 31 of a control valve seat.After electromagnet is powered, armature
2 drive steel balls 11 move up, and the high pressure oil in control chamber 32 is released from fuel-displaced throttle orifice 12, can directly flow into along orifice plate drainage trough 42
In the restricting orifice room 43 on 15 top of oil injector body.
In low pressure oil way recycle scheme proposed by the invention, static oil return is mutually separated with dynamic oil return circuit, is avoided
The two interferes with each other, and the lower static oil return of temperature is above led to electromagnet, and during drawing on it, by oil injector body
The long inclined hole of static oil return of upper cutting, oil return are further cooled down, and can be changed in this way to electromagnet with preferable cooling effect
It has been apt to the working environment of electromagnet.Static oil return it is upper draw circulation during, the bubble that can will be accumulated in electromagnet, armature chamber
It takes away together, eliminates interference of the deleterious bubbles to movement parts.Dynamic oil return is then introduced directly into oil return hole, eliminates centre
Complicated circulation passage, flow resistance is small, and a large amount of dynamic oil returns can quickly be discharged, and improves the response speed of fuel injector.In addition,
Dynamic oil return is expelled directly out, and will not be introduced into electromagnet room, avoids the impact to movement parts such as armature, can be effectively improved oil spout
The accuracy of spray of device.
Claims (8)
1. a kind of low pressure oil duct fuel injection valve, including the very tight cap of control valve group, electromagnet assembly, electromagnetism (6), electromagnet bullet
Spring (7), restricting orifice (13), oil injector body (15), control piston (17) and mandril (39), the top cavity of oil injector body (15)
Interior to be equipped with control valve group, control valve group includes control valve seat (1), armature (2), damping spring (3) and armature lever (4), control
Valve seat (1) center processed is equipped with valve seat orifice, and armature lever (4) lower end is protruded into valve seat orifice and can be moved axially along valve seat orifice, armature
Bar (4) is equipped with armature (2), is equipped with damping spring (3) between armature (2) and control valve seat (1), and damping spring terminates on (3)
It touches armature (2), lower end engagement control valve seat (1)；Control valve group upper end is equipped with electromagnet assembly, and electromagnet assembly passes through electromagnetism
Very tight cap (6) connect with oil injector body (15) upper end, and electromagnet assembly includes coil (9), iron core (23), binding post (25), iron
Core valve seat (26) and electromagnet casing (28), electromagnet casing (28) is interior to be successively arranged binding post (25), iron core valve from top to bottom
Seat (26) and iron core (23), iron core (23) center are equipped with electromagnet spring cavity (27)；Iron core (23) is protruded into armature lever (4) upper end
In electromagnet spring cavity (27), and electromagnet spring (7) are arranged on armature lever (4), electromagnet spring cavity (27) top is set
Have electromagnetism iron gasket (8), the external peripheral surface of electromagnet casing (28) is equipped with multiple equally distributed planes, so that electromagnetism is very tight
When tightening, there are oil return gap (21), the lower end surface of iron core (23) and oil injector bodies between cap (6) and oil injector body (15)
(15) adjustment ring (10) are equipped between upper surface, it is characterized in that: control valve seat (1) divides the top cavity of oil injector body (15)
At the restricting orifice room (43) of the armature chamber (30) and receiving restricting orifice (13) that accommodate armature (2), the section of oil injector body (15)
Restricting orifice (13) are equipped in discharge orifice plate room (43), restricting orifice (13) is located at control valve seat (1) bottom；Under restricting orifice (13)
End face is equipped with meter in hole (14), and restricting orifice (13) center is equipped with fuel-displaced throttle orifice (12), is equipped in oil injector body (15)
High pressure oil input channel (16), high pressure oil input channel (16) are connected to meter in hole (14)；Control valve is equipped at fuel-displaced throttle orifice (12)
Sealing element, control valve seal being capable of movable sealing fuel-displaced throttle orifice；Oil injector body (15) center is equipped with control plunger shaft (33),
The control piston (17) that can be moved up and down is equipped in control plunger shaft (33), control piston (17) lower end connects mandril (39),
The oil spout end of oil injector body (15) connects transition block (40)；Control valve seat (1) lower end surface is equipped with the vertical through-hole of multiple control valve seats
(31), armature chamber (30) is connected to by the vertical through-hole of control valve seat (31) with the restricting orifice room (43) of oil injector body (15)；Oil spout
The oil injector body drainback passage and main oil return hole (18) mutually staggered, main oil return hole (18) upper end connection section are equipped in body (15)
Discharge orifice plate room (43)；Electromagnet casing (28) is equipped with electromagnet casing inclined hole (22), and the inner sidewall of iron core valve seat (26) is equipped with
Oil return gap (21) are connected to by iron core valve seat inclined hole (24), electromagnet casing inclined hole (22) with iron core valve seat inclined hole (24), iron core
Valve seat inclined hole (24) is connected to electromagnet spring cavity (27), and armature (2) is equipped with armature through-hole (29), and armature through-hole (29) is up and down
End is respectively communicated with electromagnet spring cavity (27) and armature chamber (30)；
The oil injector body drainback passage includes the static long inclined hole of oil return (20) and radial blind holes (19), the static long inclined hole of oil return
(20) lower end is connected to the radial blind holes (19) on oil injector body (15) side wall, and radial blind holes (19) and control plunger shaft (33) are even
Logical, the upper end of the static long inclined hole of oil return (20) is connected to oil return gap (21)；
Or the oil injector body drainback passage includes static oil return inclined hole (44), static oil return inclined hole (44) upper end opening is located at
For oil injector body (15) close to the end face of electromagnet, the upper end opening of static oil return inclined hole (44) is connected to oil return gap (21), static
Oil return inclined hole (44) lower ending opening is located at the end face that oil injector body (15) is contacted with transition block (40), in transition block (40) and oil spout
The end face that body (15) is in contact is equipped with transition block upper groove (41), and the lower ending opening of static oil return inclined hole (44) is connected to transition
Block upper groove (41), transition block upper groove (41) connection control plunger shaft (33).
2. a kind of low pressure oil duct fuel injection valve as described in claim 1, it is characterized in that: the armature (2) is sleeved on armature
On bar (4).
3. a kind of low pressure oil duct fuel injection valve as described in claim 1, it is characterized in that: the armature (2) and armature lever (4)
It is integrally formed.
4. a kind of low pressure oil duct fuel injection valve as described in claim 1, it is characterized in that: the control valve seal is steel ball
(11).
5. a kind of low pressure oil duct fuel injection valve as described in claim 1, it is characterized in that: the control valve seal is plane
Valve (11a), the restricting orifice (13) matched with flat valve (11a) are no conical surface orifice plate (13a).
6. a kind of low pressure oil duct fuel injection valve as described in claim 1, it is characterized in that: the radial blind holes (19), static state
The long inclined hole of oil return (20), oil return gap (21), electromagnet casing inclined hole (22) and iron core valve seat inclined hole (24) constitute static oil return
Channel, static drainback passage are at least one.
7. a kind of low pressure oil duct fuel injection valve as described in claim 1, it is characterized in that: the control valve seat (1) is towards section
Discharge orifice plate (13) end face is radially equipped with multiple control valve seat drainage troughs identical with control valve seat vertical through-hole (31) quantity
(38), multiple control valve seat drainage troughs (38) are uniformly distributed along control valve seat (1) lower end surface, each control valve seat drainage trough
(38) it is connected to a vertical through-hole of control valve seat (31).
8. a kind of low pressure oil duct fuel injection valve as described in claim 1, it is characterized in that: the restricting orifice (13) is towards control
Valve seat (1) end face processed is radially equipped with multiple orifice plate drainage troughs (42) identical with control valve seat vertical through-hole (31) quantity, more
A orifice plate drainage trough (42) is uniformly distributed along control restricting orifice (13) upper surface, each orifice plate drainage trough (42) and a control
The vertical through-hole of valve seat (31) connection processed.
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| CN201611153148.4A CN106762290B (en) | 2016-12-14 | 2016-12-14 | A kind of low pressure oil duct fuel injection valve |
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| CN201611153148.4A CN106762290B (en) | 2016-12-14 | 2016-12-14 | A kind of low pressure oil duct fuel injection valve |
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| CN106762290B true CN106762290B (en) | 2019-05-14 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107503870B (en) * | 2017-10-10 | 2019-12-31 | 中国第一汽车股份有限公司 | Fuel supply system for diesel engine |
| CN107514329B (en) * | 2017-10-10 | 2020-06-16 | 中国第一汽车股份有限公司 | Double-oil inlet channel oil sprayer |
| CN109099192A (en) * | 2018-09-21 | 2018-12-28 | 英嘉动力科技无锡有限公司 | A kind of novel two-position three-way valve |
| CN110529317A (en) * | 2019-08-23 | 2019-12-03 | 一汽解放汽车有限公司 | A kind of fuel injection valve valve pocket assembly |
| CN111577498B (en) * | 2020-05-18 | 2021-12-14 | 上海工程技术大学 | Common rail oil injector based on two-position three-way principle |
| CN114439662B (en) * | 2022-02-22 | 2023-04-18 | 一汽解放汽车有限公司 | Switching valve and common rail system |
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