CN106351775B - A kind of control chamber middle high-pressure electric control fuel injector - Google Patents

A kind of control chamber middle high-pressure electric control fuel injector Download PDF

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Publication number
CN106351775B
CN106351775B CN201611051972.9A CN201611051972A CN106351775B CN 106351775 B CN106351775 B CN 106351775B CN 201611051972 A CN201611051972 A CN 201611051972A CN 106351775 B CN106351775 B CN 106351775B
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China
Prior art keywords
control
needle
valve
valve seat
oil
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CN201611051972.9A
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CN106351775A (en
Inventor
张建明
丁铁新
汝晶
秦淑英
陈晓辉
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North oil electronic control fuel injection system (Tianjin) Co., Ltd.
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Beiyou Electronic Fuel Injection System (tianjin) Co Ltd
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Publication of CN106351775A publication Critical patent/CN106351775A/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10Other injectors with elongated valve bodies, i.e. of needle-valve type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/04Fuel-injection apparatus having means for avoiding effect of cavitation, e.g. erosion

Abstract

The invention discloses a kind of control chamber middle high-pressure electric control fuel injectors, including control valve, control valve seat, oil injector body, needle-valve, needle-valve body, the control valve and control valve seat top surface cooperate, control valve seat is placed in oil injector body inner cavity, oil injector body and needle-valve body are tightly connected, needle-valve is located at below control valve seat, control chamber is formed between the control valve seat bottom and needle-valve top surface, the control chamber is located at the middle section position of oil injector body;The needle-valve uses the control plunger and spindle fit form of two-piece unit formula, or uses integral structure.The present invention can meet the requirement of fuel injection system product up-gradation, the demand of 2000bar-3000bar injection pressure is adapted to, and has the characteristics that small movement parts quality, fast response time, injection pressure oscillation is small, gapless leakage, control valve seat sheet cavitation risk is low, production technology is good.

Description

A kind of control chamber middle high-pressure electric control fuel injector
Technical field
The present invention relates to internal combustion engine fuel injection system fields, more particularly to a kind of control chamber middle high pressure Electric-controlled fuel injector.
Background technique
As the requirement of energy consumption and emission regulation is more and more stringent, internal combustion engine is to the oil spout in fuel injection system Device proposes requirements at the higher level.It is mainly reflected in following aspect:
High-pressure injection: design object pressure reaches 2000bar or more, and subsequent upgrade pressure is up to 3000bar.
Accurate injection: the requirement of " timing ", " quantitative " accuracy of spray is higher, and injection scattered error is small, between the multi-injection stable time Every short, jetting stability is good.
Low energy losses: avoiding static leakage from losing in the design of fuel injector, reduces dynamic leakage loss, thus reduces pump System energy consumption is to reduce the energy loss of fuel injection system.
High reliability: product be subjected to low higher pressure pulse fatigue failure risk, good airproof performance, cavitation erosion risk it is low, It wears small etc..
Other require low such as processing cost, homogeneity of product, product inheritance etc. to have requirements at the higher level.
Chinese patent CN200820132188.5 and CN103590949A propose a kind of fuel injector, and primary structure is as schemed Shown in 1, using setting form in control chamber.This kind of fuel injector is widely applied on 1600bar-2000bar fuel injector product.
For 2000bar-3000bar fuel injector, with mentioning for the index requests such as injection pressure, accuracy of spray and energy loss Height, the said goods face optimization and upgrading, are mainly in particular in:
1, for control plunger 52 with 58 movement parts of spindle compared with long, quality is big, rigidity is low, and transient state is opened, closing velocity is by about Beam.
2,53 volume of oil pocket is small in oil injector body 5, and the pressure oscillation that fuel injection processes draw is bigger than normal.
3, belong to the face that is slidably matched at the top of spindle 58 and needle-valve body 14, and can be shown with injection its gap leakage flow rate of pressure rise It writes and increases, thus cause the energy loss of fuel system big.
4, demand of the higher injection pressure to product structure reliability and sealing performance is prominent.
It can be seen that obviously there are still upgradings for above-mentioned Chinese patent CN200820132188.5 and CN103590949A product Optimize space.The high-pressure electric control fuel injector for how founding a kind of requirement that can meet fuel injection system product up-gradation, makes it The demand of 2000bar-3000bar injection pressure is adapted to, and there is small movement parts quality, fast response time, injection pressure The features such as small, gapless is revealed, control valve seat top surface cavitation erosion risk is low, production technology is good is fluctuated, current industry urgent need is become Improved target.
Summary of the invention
The technical problem to be solved in the present invention is to provide the height that one kind can meet the requirement of fuel injection system product up-gradation Voltage control fuel injector can adapt to the demand of 2000bar-3000bar injection pressure, and, sound small with movement parts quality Answer the features such as speed is fast, injection pressure oscillation is small, gapless is revealed, control valve seat sheet cavitation risk is low, production technology is good.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
A kind of control chamber middle high-pressure electric control fuel injector, including control valve, control valve seat, oil injector body, needle-valve, needle-valve Body, the control valve and control valve seat top surface cooperate, and control valve seat is placed in oil injector body inner cavity, and oil injector body and needle-valve body seal Connection, needle-valve are located at below control valve seat, and control chamber, the control chamber are formed between the control valve seat bottom and needle-valve top surface Positioned at the middle section position of oil injector body;The needle-valve uses the control plunger and spindle fit form of two-piece unit formula, or uses Integral structure.
Further, the distance between the control valve seat top surface and control chamber account for the 20%- of oil injector body cavity length 60%.
Further, the control valve seat uses the separate form of upper-lower seal contact, including control upper valve seat, control valve Lower seat;Up-thin-low-thick stepped hole is equipped with inside the control upper valve seat;The control lower valve seat is in inverted concave structure, inverted concave Inner cavity and needle-valve top surface between form control chamber, throttle orifice is equipped at the top of control lower valve seat, on the throttle orifice and control valve Stepped hole lower section connection in seat, control lower valve seat top-side are equipped with throttling pore;Stepped hole in the control upper valve seat Lower section accounts for the 60%-90% of entire control valve seat length.
Further, the gap between the side wall and control valve seat lateral surface of the oil injector body inner cavity forms fuel gallery, Sealing surface is formed between control valve seat top and oil injector body;Below the sealing surface, the needle-valve bottom conical surface and needle-valve body head match It closes in the sealing intersection above section formed, the pressure stabilizing cavity being connected is respectively formed in addition to control chamber.
Further, on the needle-valve, with needle-valve body upper section inner wall contact site using the guide section of protrusion, the guiding Section offers longitudinal groove, and the longitudinal groove and needle-valve body upper section inner wall form fuel gallery.
Further, boss or clip spring structure, the boss or the installation of clip spring structure upper surface are equipped in the middle part of the needle-valve Needle valve spring pressure regulation gasket, the needle valve spring pressure regulation gasket top are equipped with needle valve spring, the needle valve spring top surface and control Bottom surface of valve seat contact processed.
Further, when the oil inlet section of oil injector body is connected with high pressure connection structure, the oil injector body and high-voltage connecting Head uses unitary form.
Further, the oil injector body and needle-valve body screw to form sealed connection by being located at the tight cap of oil nozzle of periphery.
Further, the control valve adopts electromagnetically controlled Ceramic Balls briquetting.
Further, high pressure oil inlet and oil return opening, the high pressure oil inlet and oil return are provided on the oil injector body Mouth is respectively positioned on oil injector body middle part, control valve seat lower position, and the high pressure oil inlet is directly connected to oil injector body inner cavity, with The drainback passage of the oil return opening connection extends upward through oil injector body.
By using above-mentioned technical proposal, the present invention has at least the following advantages:
1, form is set in control chamber by adopting:
(1) response speed that fuel injector is opened, closed is improved.Even if being located at the top of oil injector body in control valve seat top surface In the case where, control chamber can be placed in the central region of oil injector body, and the spray distance between borehole of control chamber and needle-valve body shortens, movement parts Length shortens, and weight reduces, and rigidity improves.
(2) risk of control valve seat top surface close region cavitation erosion is reduced.Control upper valve seat and control valve (pressure containing Ceramic Balls Block) the common failure mode of contact surface region cavitation erosion failure category fuel injector, it also will increase with the risk that injection pressure improves failure. By control upper valve seat top surface with control lower valve seat throttle orifice between at a distance from increase, at throttle orifice generate fuel oil bubble controlling Bubble restores with static pressure and is ruptured in the long-channel of upper valve seat stepped hole lower section, and the risk of control valve seat top surface cavitation erosion reduces.
2, by using integral type needle valve design (control plunger and spindle are integrally designed):
(1) controlling plunger and the function of spindle can be substituted by needle-valve, and number of components is reduced, assembly difficulty reduces between component.
(2) controlling plunger and the function of spindle can be substituted by needle-valve, and the radial positioning for controlling lower valve seat can be directly by needle Guide frame between valve and needle-valve body realizes, structure is simple, good manufacturability.
3, big volume pressure stabilizing cavity design (being predominantly located at the top of needle-valve body):
(1) oil injector body processing technology is good.On the outside of oil injector body inner cavity and control upper valve seat lateral surface, control lower valve seat Gap self-assembling formation fuel flow communication channel between face.
(2) volume of the designing voltage regulator chamber is larger and mainly close to the top of needle-valve body, is conducive to reduce because fuel oil sprays Pressure oscillation caused by process, oil spout precision is high, and stability is good.
(3) by the design, control upper valve seat sealing surface or less, control lower valve seat, needle-valve and needle-valve body sealing intersection with The problem of upper part, homogeneous intercommunicated, pressure stabilizing cavity pressure is balanced, and clearance leakage is not present.
(4) mating surface between needle-valve and needle-valve body only needs guide function, is not required to seal, and clamping stagnation, abrasion risk are small, cooperation essence Degree requires to reduce.
4, oil injector body and high pressure connection are integrally designed, the wind for thoroughly avoiding high pressure connection from locally leaking by seal failure Danger.
Detailed description of the invention
The above is merely an overview of the technical solutions of the present invention, in order to better understand the technical means of the present invention, below In conjunction with attached drawing, the present invention is described in further detail with specific embodiment.
Fig. 1 is the cross-sectional view of the structure of high-pressure electric control fuel injector in the prior art;
Fig. 2 is the control chamber middle high-pressure electric control injector assembly sectional view in the embodiment of the present invention 1;
Fig. 3 is control upper valve seat sectional view;
Fig. 4 is control lower valve seat sectional view;
Fig. 5 is needle valve structure sectional view;
Fig. 6 is needle-valve and needle valve structure sectional view;
Fig. 7 is tight cap of oil nozzle sectional view;
Fig. 8 is oil injector body sectional view;
Fig. 9 is the control chamber middle high-pressure electric control injector assembly sectional view in embodiment 2;
Figure 10 is the oil injector body sectional view in Fig. 9.
Parts numbers are as follows in figure: 1 electromagnetic valve component, 2 magnetic valve springs adjust gasket, 3 magnetic valve springs, 4 solenoid valves Nut, 5 oil injector bodies, 6 filter cores, 7 nuts, 8 Ceramic Balls briquettings, 9 control upper valve seats, 10 control lower valve seats, 11 needle valve springs, 12 Needle valve spring pressure regulation gasket, 13 tight cap of oil nozzle, 14 needle-valve bodies, 15 needle-valves, 16 oil spilling joint screws, 17 guide sleeves, 18 gasket rings, 19 Armature, 20 pressure stabilizing cavities, 21 control chambers;50 control valve seats, 51 sealing rings, 52 control plungers, 53 oil pockets, 54 pressure springs, 55 needles Valve guide sleeve, 56 lifts adjust gasket, 57 high-pressure oil duct holes, 58 spindles, 59 high pressure connections;71 oil return openings, 72 high pressure oil inlets.
Specific embodiment
Embodiment 1
High-pressure electric control fuel injector as shown in Figure 2 mainly includes control valve, control valve seat, oil injector body 5, needle-valve 15, needle Valve body 14;Wherein control valve is formed by the Ceramic Balls briquetting 8 of Electromagnetic Control, and control valve seat preferably uses point that upper-lower seal contacts Body form, including control upper valve seat 9, control lower valve seat 10;Ceramic Balls briquetting 8 and control 9 top surface of upper valve seat cooperate, on control valve Seat 9, control lower valve seat 10 are placed in 5 inner cavity of oil injector body, and oil injector body 5 and needle-valve body 14 are tightly connected, and needle-valve 15 is located at control 10 lower section of lower valve seat, controls and forms control chamber 21 between 10 bottom of lower valve seat and 15 top surface of needle-valve, control chamber 21 is located at fuel injector The middle section position of body 5, preferably control the distance between 9 top surface of upper valve seat and control chamber 21 account for 5 cavity length of oil injector body 20%-60%.
It is above-mentioned in the present embodiment relative to the high-pressure electric control fuel injector of control chamber overhead in the prior art shown in Fig. 1 Electric-controlled fuel injector, will control 9 top surface of upper valve seat between control chamber 21 at a distance from increase, make control chamber 21 that can be placed in oil injector body 5 Central region, and then control chamber 21 and the spray distance between borehole of needle-valve body 14 shorten, and movement parts length is made to shorten, and weight reduces, Rigidity improves, and further improves the response speed that fuel injector is opened, closed.
As shown in figure 3, for control upper valve seat sectional view, T-shaped structure, by control upper valve seat top surface (control upper valve seat top Face center 9a, control upper valve seat top surface on the outside of 9b), control upper valve seat omoplate face 9c, control upper valve seat lateral surface 9g, 9h (ladder Side), control upper valve seat bottom surface 9d cooperatively form jointly.It controls and is equipped with up-thin-low-thick stepped hole inside upper valve seat, respectively Stepped hole upper section 9e, stepped hole lower section 9f.Cooperate shown in Fig. 2, above-mentioned control upper valve seat 9 is placed in 5 inner cavity of oil injector body, control The following table face contact of 9b and nut 7 on the outside of upper valve seat top surface, control upper valve seat omoplate face 9c and oil injector body omoplate face contact, lead to It crosses nut 7 and screws the sealing realized between the positioning and contact surface that control upper valve seat 9 in oil injector body 5.
As shown in figure 4, being in inverted concave structure, by control lower valve seat top surface 10a, control valve for control lower valve seat sectional view Lower seat lateral surface 10h, control lower valve seat bottom surface 10b, control lower valve seat inner cylinder face 10c, control lower valve seat inner top surface 10g are common It cooperatively forms;It is equipped with stepped hole upper section 10d, stepped hole lower section 10e in control lower valve seat top center, wherein stepped hole upper section 10d is throttle orifice, and control lower valve seat top-side is provided with throttling pore 10f.
Cooperate shown in Fig. 2, control upper valve seat 9 is contacted with control 10 upper-lower seal of lower valve seat, controls the stepped hole of lower valve seat Upper section 10d (throttle orifice) is connected to the stepped hole lower section 9f in control upper valve seat.According to different fuel injector length, stepped hole lower section The length of 9f is adjustable (preferably, controlling the 60%-90% that the stepped hole lower section 9f in upper valve seat accounts for entire control valve seat length), makes Its use extension design, due to control 9 top surface of upper valve seat with control 10 throttle orifice of lower valve seat between at a distance from increase, at throttle orifice It generates fuel oil bubble bubble in the long-channel of control upper valve seat stepped hole lower section 9f to restore with static pressure and rupture, controls upper valve seat The risk of top surface cavitation erosion substantially reduces.
As shown in figure 5, needle-valve is preferably integral type slender rod piece structure, the control plunger and spindle of conventional fuel injector are had both Dual function.It includes needle-valve top surface 15a, needle-valve top outside 15b, needle-valve bottom conical surface 15e, is equipped in the middle part of needle-valve Boss 15c or clip spring structure, in needle-valve middle and lower part, region 15d uses the guide section of protrusion, opens up longitudinal groove on guide section.Match It closes shown in Fig. 2, Fig. 4, is formed between needle-valve top surface 15a and control lower valve seat inner cylinder face 10c, control lower valve seat inner top surface 10g Control chamber 21.Needle-valve top outside 15b and control lower valve seat inner cylinder face 10c are formed and are sealed the face that is slidably matched.In the middle part of needle-valve Boss 15c or clip spring structure, upper surface install needle valve spring pressure regulation gasket 12,12 top of needle valve spring pressure regulation gasket installation Needle valve spring 11.11 top surface of needle valve spring is contacted with control lower valve seat bottom surface 10b.
As shown in fig. 6, needle-valve body includes needle-valve body top surface 14a, needle-valve body stepped hole upper section inner wall 14b, needle-valve body ladder Hole lower section inner wall 14c, needle-valve body head 14e, needle-valve body omoplate face 14d.Cooperate shown in Fig. 5, needle-valve middle and lower part region 15d's leads To section, it is slidably matched with needle-valve body stepped hole upper section inner wall 14b, plays needle-valve guide effect;Needle-valve middle and lower part region 15d's leads Longitudinal groove in section forms fuel gallery with needle-valve body stepped hole upper section inner wall 14b.Needle-valve bottom conical surface 15e and needle Valve head 14e cooperatively forms sealing intersection.
It is illustrated in figure 7 tight cap of oil nozzle sectional view, including top internal screw thread 13a, interior step face 13b;As shown in figure 8, For oil injector body sectional view, wherein oil injector body bottom outside is provided with oil injector body external screw thread 5f;Cooperate shown in Fig. 2, Fig. 6 institute Show, oil injector body bottom surface 5e contacts to form matching trim with needle-valve body top surface 14a, tightens realization contact by tight cap of oil nozzle 13 The sealing in face, tight cap of oil nozzle 13 are contacted by its interior step face 13b with needle-valve body omoplate face 14d, top internal screw thread 13a and spray Oily body screw thread 5f cooperation.
As shown in figure 8, the oil inlet section of oil injector body is connected with high pressure connection, oil injector body and high pressure connection use a bodily form Formula, wherein oil inlet partial interior stepped hole 5c, 5d is connected to oil injector body inner cavity, and sets transition arc in Xiang Guanqu.Cooperation figure 2, shown in Fig. 3, the gap between 5 internal chamber wall 5b of oil injector body and control upper valve seat lateral surface 9h forms fuel gallery, on control valve Sealing surface is formed between seating shoulder shoulder blade face 9c and oil injector body omoplate face 5a, by 7 screwing hermetic of nut;Below the sealing surface, needle-valve In the sealing intersection above section that the bottom conical surface and needle-valve body head fits are formed, it is respectively formed and is connected in addition to control chamber 21 Pressure stabilizing cavity 20.The volume of designing voltage regulator chamber 20 is larger and major part is close to the top of needle-valve body 14, for stablizing light fluid spray Pressure oscillation effect caused by penetrating is obvious.
Other parts as shown in Figure 2, such as electromagnetic valve component 1, magnetic valve spring adjustment gasket 2, magnetic valve spring 3, electricity The components such as magnet valve nut 4, filter core 6, oil spilling joint screw 16, guide sleeve 17, gasket ring 18, armature 19 are same as the prior art, In This is no longer repeated one by one.
Above-mentioned fuel injector assembling process is summarized as follows:
In fuel injector assembly, screwed with 13 screw thread of tight cap of oil nozzle, between needle-valve bottom conical surface 15e and needle-valve body head 14e Contact surface compress, the contact surface between needle-valve body top surface 14a and oil injector body bottom surface 5e compresses, needle valve spring 11 compresses control valve Contact sealing surface between lower seat top surface 10a and control upper valve seat bottom surface 9d.
The course of work of above-mentioned fuel injector is summarized as follows:
Be powered on to electromagnetic valve component 1, the unlatching of electromagnetism power drive armature 19, the lower surface of Ceramic Balls briquetting 8 promoted with Control forms drain path, pressure reduction in control chamber 21 between upper valve seat top surface, and needle-valve 15 lifts, fuel injector commencement of fuel injection;In When controlling electric current reduction, electromagnetic force suffered by armature 19 reduces, and magnetic valve spring 3 pushes armature 19 to compress Ceramic Balls briquetting 8, draining Channel is closed, and pressure increase in control chamber 21,15 lift of needle-valve reduces, fuel injector end of injection.
Embodiment 2
As shown in figure 9, being the sectional view of another form of control chamber middle high-pressure electric control fuel injector, with embodiment 1 Main difference be that the structure of oil injector body is different.Cooperate shown in Figure 10, high pressure oil inlet 72 is provided on oil injector body With oil return opening 71, high pressure oil inlet 72 and oil return opening 71 are respectively positioned on 5 middle part of oil injector body, control 10 lower position of lower valve seat, high It is pressed into hydraulic fluid port 72 to be directly connected to 5 inner cavity of oil injector body, the drainback passage being connected to oil return opening 71 extends upward through oil injector body 5.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, this Field technical staff makes a little simple modification, equivalent variations or modification using the technology contents of the disclosure above, all falls within this hair In bright protection scope.

Claims (8)

1. a kind of control chamber middle high-pressure electric control fuel injector, including control valve, control valve seat, oil injector body, needle-valve, needle-valve Body, the control valve and control valve seat top surface cooperate, and control valve seat is placed in oil injector body inner cavity, and oil injector body and needle-valve body seal Connection, needle-valve are located at below control valve seat, it is characterised in that:
Control chamber is formed between the control valve seat bottom and needle-valve top surface, the control chamber is located at the middle section of oil injector body, institute The spray distance between borehole for stating control chamber and needle-valve body shortens;
The control valve seat uses the separate form of upper-lower seal contact, including control upper valve seat, control lower valve seat;The control Upper valve seat top surface is located at the upper section of oil injector body by apical position;
The needle-valve uses the control plunger and spindle fit form of two-piece unit formula, or uses integral structure;
Up-thin-low-thick stepped hole is equipped with inside the control upper valve seat;The control lower valve seat is in inverted concave structure, inverted concave Inner cavity and needle-valve top surface between form control chamber, throttle orifice is equipped at the top of control lower valve seat, on the throttle orifice and control valve Stepped hole lower section connection in seat, control lower valve seat top-side are equipped with throttling pore;Stepped hole in the control upper valve seat Lower section accounts for the 60%-90% of entire control valve seat length;
High pressure oil inlet and oil return opening are provided on the oil injector body, the high pressure oil inlet and oil return opening are respectively positioned on fuel injector Body middle part, control valve seat lower position, the high pressure oil inlet are directly connected to oil injector body inner cavity, are connected to the oil return opening Drainback passage extend upward through oil injector body.
2. control chamber middle high-pressure electric control fuel injector according to claim 1, which is characterized in that the control valve seat top The distance between face and control chamber account for the 60% of oil injector body cavity length.
3. -2 described in any item control chamber middle high-pressure electric control fuel injectors according to claim 1, which is characterized in that the spray Gap between the side wall and control valve seat lateral surface of oily device cavity forms fuel gallery, between control valve seat top and oil injector body Form sealing surface;Below the sealing surface, the sealing intersection above section that the needle-valve bottom conical surface and needle-valve body head fits are formed In, the pressure stabilizing cavity being connected is respectively formed in addition to control chamber.
4. control chamber middle high-pressure electric control fuel injector according to claim 3, which is characterized in that on the needle-valve, with Needle-valve body upper section inner wall contact site offers longitudinal groove, the longitudinal groove using the guide section protruded, the guide section Fuel gallery is formed with needle-valve body upper section inner wall.
5. -2 described in any item control chamber middle high-pressure electric control fuel injectors according to claim 1, which is characterized in that the needle Boss or clip spring structure are equipped in the middle part of valve, needle valve spring pressure regulation gasket, the needle are installed in the boss or clip spring structure upper surface Valve spring pressure regulation gasket top is equipped with needle valve spring, and the needle valve spring top surface is contacted with control valve seat bottom surface.
6. -2 described in any item control chamber middle high-pressure electric control fuel injectors according to claim 1, which is characterized in that the spray The oil inlet section of oily body is connected with high pressure connection, and the oil injector body and high pressure connection use unitary form.
7. -2 described in any item control chamber middle high-pressure electric control fuel injectors according to claim 1, which is characterized in that the spray Oily body and needle-valve body screw to form sealed connection by being located at the tight cap of oil nozzle of periphery.
8. -2 described in any item control chamber middle high-pressure electric control fuel injectors according to claim 1, which is characterized in that the control Valve processed adopts electromagnetically controlled Ceramic Balls briquetting.
CN201611051972.9A 2016-11-24 2016-11-24 A kind of control chamber middle high-pressure electric control fuel injector Active CN106351775B (en)

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Publication number Priority date Publication date Assignee Title
CN110594061B (en) * 2019-09-26 2021-02-26 重庆红江机械有限责任公司 Electric control common rail type heavy oil injector
CN111472909A (en) * 2020-03-20 2020-07-31 常熟理工学院 Double-column control valve of injector

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