CN109404189A - A kind of heavy oil electric-controlled fuel injector for low-speed diesel engine - Google Patents
A kind of heavy oil electric-controlled fuel injector for low-speed diesel engine Download PDFInfo
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- CN109404189A CN109404189A CN201811635342.5A CN201811635342A CN109404189A CN 109404189 A CN109404189 A CN 109404189A CN 201811635342 A CN201811635342 A CN 201811635342A CN 109404189 A CN109404189 A CN 109404189A
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- circulation
- injector
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- 239000000446 fuel Substances 0.000 title claims abstract description 222
- 239000000295 fuel oil Substances 0.000 title claims abstract description 128
- 239000003921 oil Substances 0.000 claims abstract description 420
- 230000000694 effects Effects 0.000 claims abstract description 22
- 238000001816 cooling Methods 0.000 claims description 63
- 238000002156 mixing Methods 0.000 claims description 40
- 238000007789 sealing Methods 0.000 claims description 26
- 230000006835 compression Effects 0.000 claims description 11
- 238000007906 compression Methods 0.000 claims description 11
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 239000007921 spray Substances 0.000 claims description 10
- 239000002283 diesel fuel Substances 0.000 claims description 8
- 230000000903 blocking effect Effects 0.000 claims description 5
- 230000015556 catabolic process Effects 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 230000009471 action Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- 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
- F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
-
- 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
-
- 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
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
-
- 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
-
- 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
-
- 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
-
- 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
- F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The present invention relates to a kind of heavy oil electric-controlled fuel injectors for low-speed diesel engine, prevent from occurring in heavy oil electric-controlled fuel injector solidifying and preventing the effect that device is corroded in fuel injector to realize.The electric-controlled fuel injector, comprising: be from top to bottom disposed with fuel injector upper body, oil injector body, oil inlet orifice plate, needle-valve body and nozzle；The end face of needle-valve body towards oil inlet orifice plate is respectively formed with control cavity volume and high pressure fuel chamber；It is sequentially arranged to form oil input channel, back oil road and circulation oil duct between fuel injector upper body, oil injector body and oil inlet orifice plate, the outlet of oil input channel is respectively communicated to control cavity volume and high pressure fuel chamber by oil circuit, and circulation oil duct is connected to high pressure fuel chamber；It is equipped in circulation oil duct and blocks or be connected the circulating valve that the intracavitary fuel oil of high pressure fuel leaks；Electromagnetic valve component and fuel-displaced control valve group are installed in oil injector body；The high pressure fuel of needle-valve body is intracavitary to be equipped with fuel injector lower body component.
Description
Technical field
The present invention relates to low-speed diesel engine field, specifically a kind of heavy oil electric-controlled fuel injector for low-speed diesel engine.
Background technique
In recent years, petroleum resources were further deficient, environmental pollution is more serious, using petroleum as the light diesel fuel of raw material, gasoline etc.
Price is constantly soaring, the ownership for seriously restricting low-speed diesel engine and further development.Heavy oil belongs to poor quality fuel oil, is not required to
It further to refine, fuel cost is low, and the use cost of marine low speed diesel engine can be significantly reduced.Marine diesel row simultaneously
It puts laws and regulations requirement constantly to be promoted, the use of low-speed diesel engine is caused to be extremely restricted.It is wanted to meet low-speed diesel engine use
It asks, electric-controlled fuel injector of the exploitation for heavy oil combustion is imperative.
Currently, the foreign corporations such as watt Ceylon, Man En and Luo Run possess the low-speed diesel engine fuel system of independent development, and
And tandem product has been formed, and it is matched with different types of low-speed diesel engine, forms monopolization trend, it is domestic existing low at present
Fast diesel engine is mainly patent of introduction license production, core set of the fuel system as diesel engine, the energy absolutely not produced
Power, all to buy based on external complete fuel system, price is extremely expensive, constrains China's low-speed diesel engine autonomy-oriented and grinds
Process processed.Therefore, developing, there is the low-speed diesel engine fuel system of entirely autonomous intellectual property can break foreign technology monopolization,
Low-speed diesel engine autonomy-oriented in China's is promoted to develop process.
Low-speed diesel engine at present mainly based on mechanical fuel system, use on a small quantity the fuel system of servo oil driving with
And automatically controlledization is realized, but the fuel injector of fuel system still uses positive injector, such as the MC and ME of graceful benefactor department
Series low-speed diesel engine, RT-flex serial diesel engine of watt Ceylon etc..Mechanical fuel system cannot achieve the spirit of fuel injection characteristic
It is living to adjust, and then influence power performance, the emission performance etc. of diesel engine.Electric-controlled fuel injector can be with flexible modulation fuel injection characteristic, essence
Really control distributive value plays a significant role the burning for improving diesel engine.But marine diesel is mainly based on heavy oil combustion,
Heavy oil has the characteristics that strong corrosive, high temperature, seriously affects the functional reliability of electric-controlled fuel injector.
Compared with traditional fuel injector, electric-controlled fuel injector is in order to meet more advanced ejection function, the structure of fuel injector
More complicated, element precision is higher.Electric-controlled fuel injector increases high-speed electromagnetic valve simultaneously, and solenoid valve belongs to vulnerable part, in heavy oil
Strong corrosive and hot environment under work long hours, functional reliability be influence the electric-controlled fuel injector service life it is most important because
One of element, while reliability of the precision component under heavy oil deep-etching effect is also to belong to one of key technical problem.
The electric-controlled fuel injector of the prior art enters to the heavy oil still part in electric-controlled fuel injector after solenoid valve power-off
It remains in fuel injector, the heavy oil remained in fuel injector will appear solidification phenomenon, cause the problem of device corrodes in fuel injector.
Summary of the invention
The purpose of the present invention is to provide a kind of heavy oil electric-controlled fuel injectors for low-speed diesel engine, to solve heavy oil solidification
The problem of causing device to corrode in electric-controlled fuel injector.
The technical solution of the present invention is as follows:
The present invention provides a kind of heavy oil electric-controlled fuel injectors for low-speed diesel engine, comprising: from top to bottom sets gradually
Fuel injector upper body, oil injector body, oil inlet orifice plate, needle-valve body and nozzle；
The end face of the needle-valve body towards the oil inlet orifice plate is respectively formed with control cavity volume and high pressure fuel chamber；
It is sequentially arranged to form oil input channel, oil return between the fuel injector upper body, the oil injector body and the oil inlet orifice plate
Road and circulation oil duct, the outlet of the oil input channel is respectively communicated to the control cavity volume and the high pressure fuel by oil circuit
Chamber, the circulation oil duct are connected to the high pressure fuel chamber；It is equipped in the circulation oil duct and blocks or be connected the high pressure fuel chamber
The circulating valve that interior fuel oil leaks；
Electromagnetic valve component for being powered or powering off and described for being turned on or off is installed in the oil injector body
Control the fuel-displaced control valve group of cavity volume and the back oil road；
Intracavitary be equipped with of the high pressure fuel of the needle-valve body supplies the height for being formed between the cavity wall of the high pressure fuel chamber
The first gap or form the fuel injector lower body component sealed that fuel oil in compression ignition oil pocket passes through；
When the electromagnetic valve component is powered, heavy oil is respectively enterd by the oil input channel to the control cavity volume and institute
It is intracavitary to state high pressure fuel, the electromagnetic valve component drives the fuel-displaced control valve group that the control cavity volume and described time is connected
Oil duct, the heavy oil controlled in cavity volume are leaked by the back oil road, to reduce the oil pressure in the control cavity volume；?
After oil pressure in the control cavity volume reduces, the fuel injector lower body component is made in the intracavitary fuel oil oil pressure of the high pressure fuel
It is moved up under, to form the first gap between the cavity wall of the high pressure fuel chamber, the intracavitary heavy oil of high pressure fuel passes through institute
It states the first gap to flow into the nozzle, and sprays outward；The circulation valve breakdown, the combustion for blocking the high pressure fuel intracavitary
Oil leaks；
In electromagnetic valve component power-off, heavy oil is respectively enterd by the oil input channel to the control cavity volume and institute
It is intracavitary to state high pressure fuel, fuel-displaced control valve group disconnects the control cavity volume and the back oil road, holds to increase the control
The intracavitary oil pressure of product；After the oil pressure in the control cavity volume increases, the fuel injector lower body component is in the control volume
It is moved down under intracavitary fuel oil oil pressure effect, to form sealing between the cavity wall of the high pressure fuel chamber, the nozzle stops
Injection outward；
After the nozzle stops injection outward, the diesel oil lower than heavy oil oil pressure enters to the height by the oil input channel
In compression ignition oil pocket, the circulating valve is opened, and the intracavitary fuel oil of the high pressure fuel is connected and leaks.
Preferably, the circulation oil duct includes that intracorporal first circulation oil duct is arranged on the fuel injector and is arranged in institute
State the intracorporal second circulation oil duct of fuel injector；The fuel injector upper body forms towards fluting on the end face of the oil injector body and is used for
The first mounting groove being connected to the first circulation oil duct, the oil injector body is towards slotting on the end face of the fuel injector upper body
Form the second mounting groove for being connected to the second circulation oil duct；The end of first mounting groove and the fuel injector upper body
The joint face in face forms first conical surface；
The circulating valve includes: that a part is placed in first mounting groove, and another part is placed in second mounting groove
Interior circulation valve core；The outer surface that the circulation valve core is placed in the part in first mounting groove is equipped with first axis
The slot bottom of grooving, and the circulation valve core is placed in first mounting groove, the circulation valve core and the first mounting groove it
Between be equipped with circulation valve spring；It is described circulation valve core outer surface be equipped with for first conical surface formed conical surface seal or
Second conical surface in the second gap；
When oil pressure in the second circulation oil duct is greater than the elastic force of the circulation valve spring, the circulation valve core exists
It is moved up under oil pressure effect in the second circulation oil duct, it is close to form the conical surface between first conical surface and second conical surface
Envelope；
When oil pressure in the second circulation oil duct is less than the elastic force of the circulation valve spring, the circulation valve core exists
It is moved up under the elastic force effect of the circulation valve spring, forms the second gap between first conical surface and second conical surface,
Fuel oil in the second circulation oil duct enters to the first circulation by second gap and the first axis grooving
In oil duct, to discharge.
Preferably, the circulation valve core towards the end face in the second circulation oil duct be equipped with through slot, described second
Fuel oil in circulation oil duct is flowed into the space between the circulation valve core and second mounting groove by the through slot, then
It is flowed into the first circulation oil duct by second gap and the first axis grooving；
The direction of slot bottom of the circulation valve core towards first mounting groove, which is extended, to be had to the circulation valve spring
It is supported the first positive stop lug boss set, is formed between first positive stop lug boss and the circulation valve core and supplies the circulating valve
The step surface that the end of spring is abutted.
Preferably, the electromagnetic valve component includes:
Compression plug screw, solenoid valve, sleeve and the solenoid valve valve pocket from top to bottom set gradually；
The armature being mounted in the sleeve, the armature are arranged relative to the solenoid valve；
The control valve core being mounted in the solenoid valve valve pocket, the control valve core partially pass through the sleeve and connect institute
State armature；
The magnetic valve spring being set in the control valve core；
Armature described in the electromagnetic attracting force generated when the solenoid valves drives the control valve core to move up, described
The bounce that solenoid valve is generated when powering off by the magnetic valve spring pushes the control valve core to move down.
Preferably, it has been provided projectingly the second positive stop lug boss on the control valve core outer surface, the magnetic valve spring is limited
Position is between second positive stop lug boss and the sleeve.
Preferably, the oil inlet orifice plate is equipped with the oil outlet being connected to the control cavity volume, the oil control valve out
Component includes:
From top to bottom set gradually with the solenoid valve valve pocket it is integrally formed go out oil control valve valve pocket and fuel-displaced orifice plate；
The fuel-displaced orifice plate is equipped with the fuel-displaced throttle orifice being connected to the oil outlet, the oil outlet chamber being connected to the fuel-displaced throttle orifice,
And the flowline being connected to the oil outlet chamber；The flowline is connected to the back oil road；
Be mounted on it is described go out oil control valve valve pocket in ball valve guide rod, the ball valve guide rod relative to the control valve core and
The fuel-displaced throttle orifice setting；
After the solenoid valves drive the control valve core to move up, the ball valve guide rod is in the control volume
It is moved up under intracavitary oil pressure effect, the fuel-displaced throttle orifice is made to be connected to the oil outlet chamber, the combustion in the control cavity volume
Oil passes sequentially through the oil outlet, the fuel-displaced throttle orifice, the oil outlet chamber and the flowline and flows into the back oil road；
After magnetic valve spring pushes the control valve core to move down, the control valve core push the ball valve guide rod to
Lower movement, closes the outlet of the fuel-displaced throttle orifice, block the fuel oil entered in the fuel-displaced throttle orifice enter to it is described go out
In oil pocket.
Preferably, common shape between the outer wall of the solenoid valve, the outer wall of the sleeve and the inner wall of the oil injector body
At cooling chamber, successively aperture forms cooling oil oil input channel and cooling oil back oil road for the fuel injector upper body and the oil injector body,
The cooling oil oil input channel and the cooling oil back oil road are respectively communicated with the cooling chamber.
Preferably, the sleeve is equipped with the cooling oil via hole for being connected to the cooling chamber；
The outer wall of the solenoid valve valve pocket, it is described go out oil control valve valve pocket outer wall and the oil injector body inner wall between
Mixing oil pocket is collectively formed, successively aperture formation is connected to the mixed of the mixing oil pocket with the oil injector body for the fuel injector upper body
Back oil road is closed, the solenoid valve valve pocket is equipped with the transverse direction for being connected to the mixing oil pocket with the junction of the oil control valve valve pocket out
Oil duct；
Wherein, the cooling oil in the cooling chamber is entered in the sleeve by the cooling oil via hole, and is successively led to
Cross the gap between the gap between the sleeve and the control valve core, the control valve core and the solenoid valve valve pocket and institute
It states lateral oil duct to flow into the mixing oil pocket, enters to fuel oil in the oil outlet chamber and pass through the ball valve guide rod and described
The gap between oil control valve valve pocket and the lateral oil duct are flowed into the mixing oil pocket out, flow into the mixing oil pocket
In cooling oil and fuel oil mixing after discharged by the mixing back oil road.
Preferably, the nozzle is socketed in the needle-valve external surface, and the nozzle using interference fit type part
It is compressed with the needle-valve body by the tight cap of nozzle, the oil injector body, the oil inlet orifice plate and the needle-valve body pass through device
The tight cap of body is compressed.
Preferably, upper seal, the fuel-displaced control are equipped between the solenoid valve valve pocket and the inner wall of the oil injector body
Lower seal is equipped between valve valve pocket and the inner wall of the oil injector body processed, the mixing oil pocket is located at the upper seal and institute
It states between lower seal.
The invention has the benefit that
(1), in conjunction with the particular/special requirement of low speed machine heavy oil combustion, the solenoid valve of electric-controlled fuel injector is simultaneously using isolation, sealing
And Cooling Design, by support guide set (it is integrally formed by solenoid valve valve pocket and out oil control valve valve pocket and is formed) respectively with ball
Solenoid valve is isolated and is sealed with heavy oil working region by the couple cooperation formed between valve-stem guide and control valve core, and in solenoid valve
Surrounding design cooling chamber cools down solenoid valve, adapts to the use environment of heavy oil.
(2), the design cycle valve in electric-controlled fuel injector, when the fuel oil in fuel injector is in low pressure, the oil inlet of fuel injector
It is connected between road and circulation back oil road by circulating valve, the heavy oil in fuel injector is subjected to circulation flushing, improve oil in fuel injector
The cleannes of chamber and oil duct, while preventing heavy oil from solidifying in fuel injector.
(3), support guide set is designed in electric-controlled fuel injector, support guide set divides fuel injector lower body part and solenoid valve
From the height by designing support guide set can be with the installation site of flexible modulation solenoid valve.
(4), the seat surface sealing of fuel-displaced orifice plate uses ball valve sealing, devises ball valve guide rod structure, takes full advantage of ball valve
From guiding performance, the leakproofness to neutral and guide rod, the axial direction of the seat surface sealing, ball valve guide rod that ensure that fuel-displaced orifice plate is moved close
Envelope and guiding performance.
(5), mixing oil pocket and mixing oil duct are designed in oil injector body middle section, for couple clearance leakage will to be passed through
High pressure fuel and cooling oil are collected and individually recycle, and prevent from mutually polluting between fuel oil and cooling oil.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is one of the structural schematic diagram of fuel injector middle section；
Fig. 3 is the second structural representation of fuel injector middle section；
Fig. 4 is the third structural representation of fuel injector middle section；
Fig. 5 is the four of the structural schematic diagram of fuel injector middle section；
Fig. 6 is the structural schematic diagram of fuel injector lower body part；
Fig. 7 is scheme of installation of the circulating valve in fuel injector upper body and oil injector body；
Fig. 8 forms the structural schematic diagram of sealing between needle-valve and needle-valve body；
Fig. 9 is electromagnetic valve component and fuel-displaced control valve group in the intracorporal cooperation schematic diagram of fuel injector；
Figure 10 is electromagnetic valve component in the intracorporal cooperation schematic diagram of fuel injector；
Figure 11 is the structural schematic diagram of circulation valve core of the invention；
Description of symbols: 1- fuel injector upper body part；11- fuel injector upper body；The first mounting groove of 111-: 112- first is bored
Face；12- recycles valve spring；13- recycles valve core；131- first axis grooving；Second conical surface of 132-；133- through slot；134-
One positive stop lug boss；The first oil input channel of 102-；103- first circulation oil duct；2- fuel injector middle section；21- compresses plug screw；22- spray
Oily body；The second mounting groove of 221-；23- electromagnetism valve seals；24- solenoid valve；25- sleeve；26- armature；27- fixing screws；
28- magnetic valve spring；29- support guide set；291- solenoid valve valve pocket；292- goes out oil control valve valve pocket；293- transverse direction oil duct；
30- adjusts gasket；31- upper seal；32- control valve core；The second positive stop lug boss of 321-；33- ball valve guide rod；34- lower seal；
The fuel-displaced orifice plate of 35-；351- fuel-displaced throttle orifice；352- oil outlet chamber；353- flowline；202- second circulation oil duct；203- second into
Oil duct；204- cooling chamber；205- mixing oil pocket；206- fuel-displaced throttle orifice；209- cooling oil oil input channel；210- cooling oil oil return
Road；207- back oil road；208- mixing back oil road；6- fuel injector lower body part；4- oil inlet orifice plate；61- needle-valve body；611- the 4th is bored
Face；62- controls plunger bushing；63- pressure spring；64- needle-valve；641- third positive stop lug boss；The 642- third conical surface；65- body is tight
Cap；The tight cap of 66- nozzle；67- nozzle；402- oil outlet；403- third recycles oil duct；404- meter in hole；602- control is held
Product chamber；603- high pressure fuel chamber.
Specific embodiment
Referring to figs. 1 to Figure 11, the present invention provides a kind of heavy oil electric-controlled fuel injectors for low-speed diesel engine, comprising: by
Fuel injector upper body 11, oil injector body 22, oil inlet orifice plate 4, needle-valve body 61 and the nozzle 67 set gradually under；The needle-valve body
61 are respectively formed with control cavity volume 602 and high pressure fuel chamber 603 towards the end face of the oil inlet orifice plate 4；On the fuel injector
It is sequentially arranged to form oil input channel, back oil road 207 and circulation oil duct between body 11, the oil injector body 22 and the oil inlet orifice plate 4,
The outlet of the oil input channel is respectively communicated to the control cavity volume 602 and the high pressure fuel chamber 603 by oil circuit, described to follow
Ring oil duct is connected to the high pressure fuel chamber 603；It is equipped in the circulation oil duct and blocks or be connected in the high pressure fuel chamber 603
The circulating valve that fuel oil leaks；Electromagnetic valve component for being powered or powering off is installed and for being connected in the oil injector body 22
Or disconnect the fuel-displaced control valve group of the control cavity volume 602 and the back oil road 207；The high pressure fuel of the needle-valve body 61
It is equipped in chamber 603 and passes through for being formed between the cavity wall of the high pressure fuel chamber 603 for the fuel oil in the high pressure fuel chamber 603
The first gap or formed sealing fuel injector lower body component；When the electromagnetic valve component is powered, heavy oil passes through the oil inlet
Road is respectively enterd to the control cavity volume 602 and the high pressure fuel chamber 603, and the electromagnetic valve component drives described fuel-displaced
The control cavity volume 602 and the back oil road 207 is connected in control valve group, and the heavy oil in the control cavity volume 602 passes through
The back oil road 207 leaks, to reduce the oil pressure in the control cavity volume 602；Oil pressure in the control cavity volume 602
After reduction, the fuel injector lower body component in the high pressure fuel chamber 603 fuel oil oil pressure effect under move up, with institute
It states and forms the first gap between the cavity wall of high pressure fuel chamber 603, the heavy oil in high pressure fuel chamber 603 passes through first gap and flows into
Extremely in the nozzle 67, and spray outward；The circulation valve breakdown blocks the fuel oil in the high pressure fuel chamber 603 to leak；?
When the electromagnetic valve component powers off, heavy oil is respectively enterd by the oil input channel to the control cavity volume 602 and the high pressure
In fuel chamber 603, fuel-displaced control valve group disconnects the control cavity volume 602 and the back oil road 207, to increase the control
Oil pressure in cavity volume 602；After the oil pressure in the control cavity volume 602 increases, the fuel injector lower body component is described
It is moved down under fuel oil oil pressure effect in control cavity volume 602, it is close to be formed between the cavity wall of the high pressure fuel chamber 603
Envelope, the nozzle 67 stop spraying outward；After the nozzle 67 stops spraying outward, the diesel oil lower than heavy oil oil pressure passes through institute
It states oil input channel to enter in the high pressure fuel chamber 603, the circulating valve is opened, and the combustion in the high pressure fuel chamber 603 is connected
Oil leaks.
Referring to figs. 1 to Fig. 6 and Fig. 9, oil input channel includes the first oil input channel 102 being arranged in fuel injector upper body 11 and sets
The second oil input channel 203 in oil injector body 22 is set, the first oil input channel 102 is connected to the second oil input channel 203.When fuel oil passes through the
When two oil input channels 203 enter to oil inlet orifice plate 4, fuel oil is split up into 2 tunnels, and the first via is the master flowed into high pressure fuel chamber 603
Fuel oil, the second tunnel are the control flowed into control cavity volume 602 by the meter in hole 404 being arranged on oil inlet orifice plate 4
Fuel oil.
Wherein, it referring to Fig. 6, is bolted between fuel injector upper body 11 and oil injector body 22 in one.The nozzle
67 are socketed in 61 outer surface of needle-valve body using interference fit type part, and the nozzle 67 and the needle-valve body 61 pass through
The tight cap 66 of nozzle is compressed, the oil injector body 22, the oil inlet orifice plate 4 and the needle-valve body 61 by the tight cap 65 of body into
Row compresses.
Wherein, for the above-mentioned electric-controlled fuel injector of the application, main application is in low-speed diesel engine peculiar to vessel.It is specific next
It says, which may be implemented the injection to heavy oil combustion.In the application, after electromagnetic valve component power-off, to automatically controlled spray
It is passed through the light diesel that oil pressure is lower than the heavy oil in oily device, after light fuel enters, the oil of the oil inlet end positioned at circulating valve can be made
Drops, and then circulating valve is opened, the heavy oil remained in high pressure fuel chamber 603 is discharged by the circulating valve.In this way,
After electricity under electromagnetic valve component, by being passed through light diesel realization to the outlet of the heavy oil in electric-controlled fuel injector, reaching prevents weight
Oil solidifies in electric-controlled fuel injector, and components is prevented to be corroded the effect of damage.
Referring to Fig. 6, the circulation oil duct includes the first circulation oil duct 103 being arranged in the fuel injector upper body 11 and sets
Set the second circulation oil duct 202 in the oil injector body 22；The fuel injector upper body 11 is towards the end of the oil injector body 22
Fluting forms the first mounting groove 111 for being connected to the first circulation oil duct 103 on face, and the oil injector body 22 is towards institute
State second mounting groove 221 of the fluting formation for being connected to the second circulation oil duct 202 on the end face of fuel injector upper body 11；Institute
It states the first mounting groove 111 and the joint face of the end face of the fuel injector upper body 11 forms first conical surface 112；The circulating valve packet
Include: a part is placed in first mounting groove 111, and another part is placed in the circulation valve core in second mounting groove 221
13；The outer surface that the circulation valve core 13 is placed in the part in first mounting groove 111 is equipped with first axis grooving
131, and the circulation valve core 13 is placed in first mounting groove 111, the circulation valve core 13 and the first mounting groove 111
Slot bottom between be equipped with circulation valve spring 12；It is described circulation valve core 13 outer surface be equipped with for first conical surface
112 form second conical surface 132 in conical surface seal or the second gap；Oil pressure in the second circulation oil duct 202 is greater than described
When recycling the elastic force of valve spring 12, the circulation valve core 13 is upward under the oil pressure effect in the second circulation oil duct 202
It is mobile, conical surface seal is formed between first conical surface 112 and second conical surface 132；In the second circulation oil duct 202
When oil pressure is less than the elastic force of the circulation valve spring 12, elastic force effect of the circulation valve core 13 in the circulation valve spring 12
Under move up, the second gap, the second circulation oil duct 202 are formed between first conical surface 112 and second conical surface 132
Interior fuel oil is entered in the first circulation oil duct 103 by second gap and the first axis grooving 131, with to
Outer discharge.
Such as Fig. 1 and Fig. 9, recycling oil duct further includes the third circulation oil duct 403 being arranged on oil inlet orifice plate 4, which follows
Ring oil duct 403 is connected to second circulation oil duct 202 and high pressure fuel chamber 603 respectively.
Specifically, when electromagnetic valve component is powered, since the fuel oil being passed through into oil input channel is heavy oil, the oil pressure of heavy oil
Greater than the elastic force of circulation valve spring 12, therefore, in the case where the oil pressure of the heavy oil in second circulation oil duct 202 pushes, make circulating valve valve
Core 13 moves up, and compresses the circulation valve spring 12, and second conical surface 132 forms sealing between first conical surface 112,
Under this state, the fuel oil in high pressure fuel chamber 603 can not then be discharged by circulating valve, and can only be outside by nozzle 67
Injection, may be implemented the jet-action of electric-controlled fuel injector.
In electromagnetic valve component power-off, the high pressure heavy oil being passed into oil input channel is switched to the diesel oil of low pressure, with bavin
Constantly being passed through for oil, can make the oil pressure in second circulation oil duct 202 be reduced to low pressure diesel pressure, when second circulation oil duct 202
When interior oil pressure is less than the bounce of circulation valve spring 12, compressed circulation valve spring 12 rebounds, and pushes circulating valve
Spool 13 moves down, and the second above-mentioned gap is formed between first conical surface 112 and second conical surface 132, at this point, remaining in second
Heavy oil in circulation oil duct 202 then passes through second gap with the diesel oil entered in circulation oil duct and flows into first circulation oil duct
In 103, finally discharge；Meanwhile remaining heavy oil and new enter to control in cavity volume 602 in control cavity volume 602
Diesel oil then pass through back oil road 207 and discharge；In this way, may make when not needing electric-controlled fuel injector progress heavy oil injection
Heavy oil in control cavity volume 602 and high pressure fuel chamber 603 can discharge, and prevent heavy oil from remaining in right in electric-controlled fuel injector
Electric-controlled fuel injector internal components cause corrosion and blocking.
For circulation valve core 13, referring to Fig.1 1, the circulation valve core 13 is towards the second circulation oil duct 202
Interior end face is equipped with through slot 133, and the fuel oil in the second circulation oil duct 202 flows into described follow by the through slot 133
In space between ring valve spool 13 and second mounting groove 221, then pass through second gap and the first axis grooving
131 flow into the first circulation oil duct 103；Slot bottom of the circulation valve core 13 towards first mounting groove 111
Direction, which is extended, to be had to first positive stop lug boss 134 that is supported of circulation valve spring 12, first positive stop lug boss 134 with
The step surface abutted for the end of the circulation valve spring 12 is formed between the circulation valve core 13.In conjunction with Fig. 7 and figure
11, which can be seen that the circulation valve spring 12, is limited between first positive stop lug boss 134 and the circulation valve core 13, Ke Yizeng
The promotion of circulation valve core 13 is imitated by force to the compression effectiveness of circulation valve spring 12, and when the enhancing circulation rebound of valve spring 12
Fruit.
Referring to Fig. 2 to Fig. 5, the electromagnetic valve component includes: compression plug screw 21, the solenoid valve from top to bottom set gradually
24, sleeve 25 and solenoid valve valve pocket 29；The armature 26 being mounted in the sleeve 25, the armature 26 is relative to the solenoid valve
24 settings；The control valve core 32 being mounted in the solenoid valve valve pocket 29, the control valve core 32 partially pass through the sleeve 25
And connect the armature 26；The magnetic valve spring 28 being set in the control valve core 32；The solenoid valve 24 generates when being powered
Electromagnetic attracting force described in armature 26 drive the control valve core 32 to move up, the solenoid valve 24 power off when pass through the electricity
The bounce that magnet valve spring 28 generates pushes the control valve core 32 to move down.Wherein, plug screw 21 is compressed for that will be mounted on
(solenoid valve 24, solenoid valve valve pocket 291, goes out oil control valve valve pocket 292 and fuel-displaced at sleeve 25 to part in 22 mesoporous of oil injector body
Orifice plate 35) it is compressed.The electromagnetism valve seals 23 for improving sealing performance, the pressure are equipped between solenoid valve 24 and oil injector body 22
Tight plug screw 21 and the fuel injector upper body 11 abut against.Armature 26 is fixed together by fixing screws 27 and control valve core 32, this
Sample, armature 26 can drive control valve core 32 to move up when the attraction of the electromagnetic force by solenoid valve 24 moves up；?
When control valve core 32 moves down under the action of magnetic valve spring 28, control valve core 32 is moved down with moving armature 26.
Ball valve guide rod 33 uses unitary design, and spool shape is elongate rod of the one end with sealing spherical surface.Specifically,
The arcwall face or hemisphere face to be formed and be sealed to the outlet of fuel-displaced throttle orifice 351 are processed by the end in elongate rod.This
Sample, for ball valve guide rod 33, elongate rod may be implemented to position, and can then play in the hemisphere face that elongate rod is formed
The effect of sealing.For ball valve guide rod compared with the existing technology, the ball valve guide rod 33 in the application can be reduced in production
One of production process.
As shown in Figure 10, it in order to improve the limit effect of magnetic valve spring 28, dashes forward on 32 outer surface of control valve core
It is provided with the second positive stop lug boss 321 out, the magnetic valve spring 28 is limited in second positive stop lug boss 321 and the sleeve
Between 25.It, can be by changing meanwhile in magnetic valve spring 28 towards adjustment gasket 30 is equipped between second positive stop lug boss 321
The thickness of whole gasket 30 of modifying tone adjusts the height of sleeve 25, to compensate the accumulated error of machining.
Referring to figs. 1 to Fig. 6 and Fig. 9 and Figure 10, the oil inlet orifice plate 4 is equipped with and is connected to the control cavity volume 602
Oil outlet 402, the fuel-displaced control valve group include: from top to bottom set gradually with 29 one of the solenoid valve valve pocket at
Type goes out oil control valve valve pocket 292 and fuel-displaced orifice plate 35；The fuel-displaced orifice plate 35 goes out equipped with what is be connected to the oil outlet 402
Oily throttle orifice 206, the oil outlet chamber 352 being connected to the fuel-displaced throttle orifice 206, and be connected to the oil outlet chamber 352 fuel-displaced
Pipe 353；The flowline 353 is connected to the back oil road 207；The ball valve guide rod being mounted in the oil control valve valve pocket 292 out
33, the ball valve guide rod 33 is arranged relative to the control valve core 32 and the fuel-displaced throttle orifice 206；It is logical in the solenoid valve 24
After electricity drives the control valve core 32 to move up, oil pressure effect of the ball valve guide rod 33 in the control cavity volume 602
Under move up, so that the fuel-displaced throttle orifice 206 is connected to the oil outlet chamber 352, the fuel oil in the control cavity volume 602 is successively
Described return is flowed by the oil outlet 402, the fuel-displaced throttle orifice 206, the oil outlet chamber 352 and the flowline 353
In oil duct 207；After magnetic valve spring 28 pushes the control valve core 32 to move down, the control valve core 32 pushes the ball
Valve-stem guide 33 moves down, and closes the outlet of the fuel-displaced throttle orifice 206, and blocking enters in the fuel-displaced throttle orifice 206
Fuel oil enters in the oil outlet chamber 352.
Wherein, solenoid valve valve pocket 29 and out oil control valve valve pocket 292 integrated molding formed support guide set 29, due to the branch
Guide sleeve 29 is supportted, designs between fuel-displaced orifice plate 35 and solenoid valve 24, makes work of the solenoid valve 24 far from heavy oil in fuel injector
Region, for solenoid valve 24, farther out due to its working region apart from heavy oil, the heat that heavy oil can be made to generate is as far as possible
Solenoid valve 24 is passed to less, prevents solenoid valve 24 from overheating.Meanwhile support guide set 29 respectively with ball valve guide rod 33 and control valve
Core 32 is designed as couple cooperation, makes to reduce by the fuel oil in couple gap and cooling oil leakage quantity, close by moving between couple
It seals solenoid valve 24 and the working region of fuel oil is mutually isolated.
Preferably, referring to Fig. 6, the fuel injector lower body component includes: control plunger bushing 62,62 court of control plunger bushing
The through-hole for being connected to the high pressure fuel chamber 603 is offered to the end face of the oil inlet orifice plate 4, a part passes through the high compression ignition
It is inserted into after oil pocket 603 in the through-hole, another part is inserted into the needle-valve 64 in the nozzle 67；It is the needle-valve 64, described
It is enclosed jointly between the hole wall of through-hole and the oil inlet orifice plate 4 and sets to form the control cavity volume 602；It is set on the needle-valve 64
Pressure spring 63, the pressure spring 63 is limited on 64 outer surface of the control plunger bushing 62 and the needle-valve and is provided projectingly
Third positive stop lug boss 641 between；After the fuel oil part pressure release in the control cavity volume 602, the needle-valve 64 is described
Moved up under oil pressure effect in high pressure fuel chamber 603, with formed at the outlet cavity wall of the high pressure fuel chamber 603 it is described
First gap；After the fuel pressurization in the control cavity volume 602, oil of the needle-valve 64 in the control cavity volume 602
It is moved down under the effect of the elastic force of pressure and the pressure spring 63, with shape between the outlet cavity wall of the high pressure fuel chamber 603
At sealing.
Needle-valve 64, control plunger bushing 62, pressure spring 63 are mounted in the mesoporous of needle-valve body 61 and nozzle 67, control plunger
It covers 62 upper surfaces to be bonded with 4 lower end surface of oil inlet orifice plate, lower end is supported by pressure spring 63, and pressure spring 63 is supported on needle-valve 64
In intermediate spring support seat, 64 upper end outer round surface of needle-valve and control 62 internal circular surfaces of plunger bushing are couple cooperation.
Specifically, referring to Fig. 8, the needle-valve 64, which is located on the outer surface of the part in the high pressure fuel chamber 603, to be set
There is the second axial grooving, the position adjacent with the described second axial grooving is equipped with the third conical surface on the outer surface of the needle-valve 64
642, be formed as the 4th conical surface 611 sealed with 642 phase of the third conical surface at the outlet cavity wall of the high pressure fuel chamber 603；
When the needle-valve 64 moves up, the third conical surface 642 forms first gap with the 4th conical surface 611, described
Fuel oil in high pressure fuel chamber 603 is entered in the nozzle 67 by the described second axial grooving and first gap；?
When the needle-valve 64 moves down, the third conical surface 642 is formed with the 4th conical surface 611 to be sealed.Wherein, the third conical surface
642 and the 4th sealing principle between the conical surface 611 it is similar to the sealing principle between first conical surface 112 and second conical surface 132, this
Place, is no longer repeated.
Referring to Fig. 4, between the outer wall of the solenoid valve 24, the outer wall of the sleeve 25 and the inner wall of the oil injector body 22
Cooling chamber 204 is collectively formed, successively aperture forms cooling oil oil input channel 209 for the fuel injector upper body 11 and the oil injector body 22
With cooling oil back oil road 210, the cooling oil oil input channel 209 and the cooling oil back oil road 210 are respectively communicated with the cooling chamber
204.Cooling oil chamber is designed around solenoid valve 24, solenoid valve 24 is cooled down by the cooling oil constantly recycled, reduces electricity
The operating temperature of magnet valve 24 guarantees the working environment of solenoid valve 24.
In order to reduce fuel leakage, in this application, such as Fig. 2 to Fig. 6 and Fig. 9, the sleeve 25 is equipped with connection institute
State the cooling oil via hole of cooling chamber 204；The outer wall of the solenoid valve valve pocket 29, it is described go out oil control valve valve pocket 292 outer wall and
Mixing oil pocket 205, the fuel injector upper body 11 and the oil injector body 22 are collectively formed between the inner wall of the oil injector body 22
Successively aperture forms the mixing back oil road 208 of the connection mixing oil pocket 205, the solenoid valve valve pocket 29 and the fuel-displaced control
The junction of valve valve pocket 292 is equipped with the lateral oil duct 293 for being connected to the mixing oil pocket 205；Wherein, in the cooling chamber 204
Cooling oil is entered in the sleeve 25 by the cooling oil via hole, and passes sequentially through the sleeve 25 and the control valve core
Gap between gap, the control valve core 32 and the solenoid valve valve pocket 29 and the lateral oil duct 293 between 32 flow to
To in the mixing oil pocket 205, the fuel oil entered in the oil outlet chamber 352 passes through the ball valve guide rod 33 and the fuel-displaced control
Gap and the lateral oil duct 293 between valve valve pocket 292 processed are flowed into the mixing oil pocket 205, flow into the mixing
It is discharged after cooling oil and fuel oil mixing in oil pocket 205 by the mixing back oil road 208.
The miscella in mixing oil pocket 205 leaks in order to prevent, as shown in Fig. 2 to 6, the solenoid valve valve pocket 29
Upper seal 31, oil control valve valve pocket 292 and the oil injector body out are equipped between the inner wall of the oil injector body 22
Lower seal 34 is equipped between 22 inner wall, the mixing oil pocket 205 is located at the upper seal 31 and the lower seal 34
Between.
Above-mentioned electric-controlled fuel injector of the invention mainly includes that the energization of solenoid valve 24 and solenoid valve 24 are not powered on when in use
Two states.
When solenoid valve 24 is not yet powered, the work of armature 26, control valve core 32 and ball valve guide rod 33 in magnetic valve spring 28
Under, the bulb of ball valve guide rod 33 is pressed on to the sealed seat surface of fuel-displaced orifice plate 35, sealed seat surface is made to be in sealing state.Needle-valve
64 are in close state under the action of high pressure fuel hydraulic coupling and pressure spring 63.
Solenoid valve 24 generates electromagnetic force after being powered, and armature 26 is driven control by the suction from solenoid valve 24
Spool 32 processed overcomes the active force of magnetic valve spring 28 to move upwards, and the pressing force of 33 upper end of ball valve guide rod reduces, in lower end liquid
Under pressure effect, ball valve guide rod 33 is moved upwards, and lower end sealed seat surface is opened, and the high pressure fuel controlled in cavity volume 602 passes through
Oil outlet 402 and fuel-displaced throttle orifice 206 are flowed out from sealed seat surface, and the fuel pressure controlled in cavity volume 602 gradually decreases, needle-valve
64 under the action of the hydraulic coupling of lower end, overcomes 63 active force of pressure spring to move upwards and opens the sealing surface of nozzle 67, high pressure
Fuel oil in fuel chamber 603 is sprayed from the spray orifice at 67 end of nozzle.
After solenoid valve 24 powers off, electromagnetic force disappears, and control valve core 32 and armature 26 are under the action of magnetic valve spring 28
It moves downward, the reset force that spring generates passes to ball valve guide rod 33 by control valve core 32, and 33 lower end surface of ball valve guide rod will go out
Oily throttle orifice 206 seals, and the high pressure fuel in fuel injector is again introduced into sealing state, and the high pressure fuel (diesel oil) in oil input channel is no
Entered in the control cavity volume 602 and high pressure fuel chamber 603 of fuel injector disconnectedly, control cavity volume 602 in fuel pressure by
Edge up height, and under the double action of hydraulic coupling and spring force, needle-valve 64 moves downward and closes the sealing surface of nozzle 67, oil spout
Journey terminates.
When the fuel pressure in the oil input channel for flowing through fuel injector upper body 11 is reduced to a certain limiting pressure, fuel injector can not be into
Row fuel oil sprays, and is still filled with fuel oil in fuel injector.At this point, the active force of circulation valve spring 12 is greater than circulation 13 lower end of valve core
The fuel oil hydraulic coupling in face, under spring force, circulation valve core 13 move downward and will recycle the sealing surface of valve core 13
It opens, the fuel oil in fuel injector is entered in back oil road 207 by sealing surface, the height in oil input channel, back oil road 207 and fuel injector
Compression ignition oil pocket 603 is connected to, and the fuel oil in fuel injector enters circulation pattern flowing.
Couple cooperates the support guide set 29 of the intracorporal centre of fuel injector device each other with ball valve guide rod 33, control valve core 32,
During fuel injector continues working, it is full of low pressure cooling oil in solenoid valve cooling chamber 204, is full of height in control cavity volume 602
The sealed seat surface of compression ignition oil, 33 lower end of ball valve guide rod and fuel-displaced orifice plate 35 is opened, and a small amount of fuel oil can pass through ball valve guide rod 33 and branch
The fit clearance leakage of guide sleeve 29 is supportted, a small amount of cooling oil can be let out by control valve core 32 and the fit clearance of support guide set 29
Leakage, fuel oil and cooling oil leak to the junction of control valve core 32 Yu ball valve guide rod 33, pass through the cross at 29 middle part of support guide set
It is entered in mixing oil pocket 205 to oil duct 293, the two seals that support guide covers 29 outer rings can prevent mixing oil pocket 205
Interior miscella is caused to the leakage of other positions to cooling oil and fuel oil pollution, and the miscella in mixing chamber passes through oil injector body 22
Mixing back oil road 208 be introduced into outside oil injector body 22.
In the fuel injector course of work, solenoid valve 24 is caused 24 operating temperature of solenoid valve high by the heat from heavy oil,
The operational failure of solenoid valve 24 in order to prevent, 24 surrounding of solenoid valve design cooling chamber 204 and cooling oil duct.Cooling oil is from cooling oil
Oil input channel 209 enters in solenoid valve cooling chamber 204, and heat is taken away in flowing in solenoid valve cooling chamber 204, and returns from cooling oil
Oil duct 210 flows out.
In the application, fuel injector includes fuel injector upper body part 1, fuel injector middle section 2 and fuel injector lower body part 6,
Fuel injector upper body part 1, fuel injector middle section is collectively formed in fuel injector upper body 11, circulation valve spring 12 and circulation valve core 13
2 include that the parts such as oil injector body 22, fuel-displaced orifice plate 35, support guide set 29, ball valve guide rod 33 and high-speed electromagnetic valve 24 are common
Form fuel injector middle section 2, oil inlet orifice plate 4, needle-valve body 61, control plunger bushing 62, pressure spring 63, needle-valve 64 and nozzle 67
Fuel injector lower body part 6 is collectively formed in equal parts.
Electric-controlled fuel injector of the invention can be adapted for heavy oil strong corrosive, the use environment of high temperature, while have flexibly
The features such as adjusting fuel injection characteristic, accurate control loop distributive value, meets the growth requirement of low-speed diesel engine.Advantages of the present invention master
Have:
(1), in conjunction with the particular/special requirement of low speed machine heavy oil combustion, the solenoid valve 24 of electric-controlled fuel injector uses simultaneously is isolated, is close
Envelope and Cooling Design, will by the couple cooperation that support guide set 29 is formed between ball valve guide rod 33 and control valve core 32 respectively
Solenoid valve 24 is isolated and is sealed with heavy oil working region, and designs cooling chamber 204 around solenoid valve 24 and carry out to solenoid valve 24
It is cooling, adapt to the use environment of heavy oil.
(2), the design cycle valve in electric-controlled fuel injector, when the fuel oil in fuel injector is in low pressure, the oil inlet of fuel injector
It is connected between road and circulation back oil road by circulating valve, the heavy oil in fuel injector is subjected to circulation flushing, improve oil in fuel injector
The cleannes of chamber and oil duct, while preventing heavy oil from solidifying in fuel injector.
(3), design support guide set 29 in electric-controlled fuel injector, support guide covers 29 for fuel injector lower body part 6 and electromagnetism
Valve 24 separates, can be with the installation site of flexible modulation solenoid valve 24 by the height of design support guide set 29.
(4), the seat surface sealing of fuel-displaced orifice plate 35 uses ball valve sealing, devises 33 structure of ball valve guide rod, takes full advantage of
Ball valve from guiding performance, the leakproofness to neutral and guide rod, ensure that the seat surface sealing of fuel-displaced orifice plate 35, ball valve guide rod 33
Axial dynamic sealing and guiding performance.
(5), mixing oil pocket 205 and mixing oil duct are designed in 22 middle section of oil injector body, for couple gap will to be passed through
The high pressure fuel and cooling oil of leakage are collected and individually recycle, and prevent from mutually polluting between fuel oil and cooling oil.
Claims (10)
1. a kind of heavy oil electric-controlled fuel injector for low-speed diesel engine characterized by comprising the spray from top to bottom set gradually
Oily device upper body (11), oil injector body (22), oil inlet orifice plate (4), needle-valve body (61) and nozzle (67)；
The end face of the needle-valve body (61) towards the oil inlet orifice plate (4) is respectively formed with control cavity volume (602) and high compression ignition
Oil pocket (603)；
It is sequentially arranged to form oil inlet between the fuel injector upper body (11), the oil injector body (22) and the oil inlet orifice plate (4)
Road, back oil road (207) and circulation oil duct, the outlet of the oil input channel is respectively communicated to the control cavity volume by oil circuit
(602) and the high pressure fuel chamber (603), the circulation oil duct are connected to the high pressure fuel chamber (603)；In the circulation oil duct
The circulating valve to leak equipped with the fuel oil for blocking or being connected in the high pressure fuel chamber (603)；
Electromagnetic valve component for being powered or powering off and described for being turned on or off is installed in the oil injector body (22)
Control the fuel-displaced control valve group of cavity volume (602) and the back oil road (207)；
It is equipped in the high pressure fuel chamber (603) of the needle-valve body (61) for shape between the cavity wall of the high pressure fuel chamber (603)
At the first gap passed through for the fuel oil in the high pressure fuel chamber (603) or form the fuel injector lower body component sealed；
When the electromagnetic valve component is powered, heavy oil respectively enterd by the oil input channel to the control cavity volume (602) and
In the high pressure fuel chamber (603), the electromagnetic valve component drives the fuel-displaced control valve group that the control cavity volume is connected
(602) it is leaked with the back oil road (207), the heavy oil controlled in cavity volume (602) by the back oil road (207), with
Reduce the oil pressure in control cavity volume (602)；After the oil pressure in control cavity volume (602) reduces, the oil spout
Device lower body component in the high pressure fuel chamber (603) fuel oil oil pressure effect under move up, with the high pressure fuel chamber
(603) the first gap is formed between cavity wall, the heavy oil in high pressure fuel chamber (603) flows into the spray by first gap
In mouth (67), and spray outward；The circulation valve breakdown blocks the fuel oil in the high pressure fuel chamber (603) to leak；
In electromagnetic valve component power-off, heavy oil respectively enterd by the oil input channel to the control cavity volume (602) and
In the high pressure fuel chamber (603), fuel-displaced control valve group disconnects the control cavity volume (602) and the back oil road (207),
To increase the oil pressure in control cavity volume (602)；After the oil pressure in control cavity volume (602) increases, the spray
Oily device lower body component it is described control cavity volume (602) in fuel oil oil pressure effect under move down, with the high pressure fuel
Sealing is formed between the cavity wall of chamber (603), the nozzle (67) stops injection outward；
After the nozzle (67) stop injection outward, the diesel oil lower than heavy oil oil pressure enters to the height by the oil input channel
In compression ignition oil pocket (603), the circulating valve is opened, and the fuel oil be connected in the high pressure fuel chamber (603) leaks.
2. the heavy oil electric-controlled fuel injector according to claim 1 for low-speed diesel engine, which is characterized in that the recycle oil
Road includes the first circulation oil duct (103) being arranged in the fuel injector upper body (11) and setting in the oil injector body (22)
Second circulation oil duct (202)；The fuel injector upper body (11) forms towards fluting on the end face of the oil injector body (22) and uses
In the first mounting groove (111) being connected to the first circulation oil duct (103), the oil injector body (22) is towards the fuel injector
Fluting forms the second mounting groove (221) for being connected to the second circulation oil duct (202) on the end face of upper body (11)；It is described
The joint face of the end face of first mounting groove (111) and the fuel injector upper body (11) forms first conical surface (112)；
The circulating valve includes: that a part is placed in first mounting groove (111), and another part is placed in second mounting groove
(221) the circulation valve core (13) in；Circulation valve core (13) is placed in the outer of the part in first mounting groove (111)
Surface is equipped with first axis grooving (131), and the circulation valve core (13) is placed in first mounting groove (111), institute
It states and is equipped with circulation valve spring (12) between circulation valve core (13) and the slot bottom of the first mounting groove (111)；The circulation valve core
(13) outer surface is equipped with second conical surface for forming conical surface seal or the second gap with first conical surface (112)
(132)；
When oil pressure in the second circulation oil duct (202) is greater than the elastic force of circulation valve spring (12), the circulating valve
Spool (13) moves up under the oil pressure effect in the second circulation oil duct (202), first conical surface (112) and described
Second conical surface forms conical surface seal between (132)；
When oil pressure in the second circulation oil duct (202) is less than the elastic force of circulation valve spring (12), the circulating valve
Spool (13) moves up under the elastic force effect of circulation valve spring (12), first conical surface (112) and described second
The second gap is formed between the conical surface (132), the fuel oil in the second circulation oil duct (202) passes through second gap and described the
One axial grooving (131) enters in the first circulation oil duct (103), to discharge.
3. the heavy oil electric-controlled fuel injector according to claim 2 for low-speed diesel engine, which is characterized in that the circulating valve
Spool (13) is equipped with through slot (133) towards the end face in the second circulation oil duct (202), the second circulation oil duct
(202) fuel oil in is flowed between the circulation valve core (13) and second mounting groove (221) by the through slot (133)
Space in, then the first circulation oil duct (103) flowed by second gap and the first axis grooving (131)
In；
The direction of slot bottom of circulation valve core (13) towards first mounting groove (111), which is extended, to be had to the circulating valve
The first positive stop lug boss (134) that spring (12) is supported, first positive stop lug boss (134) and the circulation valve core (13)
Between form the step surface that is abutted of end for circulation valve spring (12).
4. the heavy oil electric-controlled fuel injector according to claim 1 for low-speed diesel engine, which is characterized in that the solenoid valve
Component includes:
Compression plug screw (21), solenoid valve (24), sleeve (25) and the solenoid valve valve pocket (29) from top to bottom set gradually；
The armature (26) being mounted in the sleeve (25), the armature (26) are arranged relative to the solenoid valve (24)；
The control valve core (32) being mounted in the solenoid valve valve pocket (29), the control valve core (32) partially pass through the sleeve
(25) and the armature (26) are connected；
The magnetic valve spring (28) being set on the control valve core (32)；
Armature (26) described in the electromagnetic attracting force that the solenoid valve (24) generates when being powered drives the control valve core (32) upward
It is mobile, the control valve core is pushed by the bounce that the magnetic valve spring (28) generate when the solenoid valve (24) powers off
(32) it moves down.
5. the heavy oil electric-controlled fuel injector according to claim 4 for low-speed diesel engine, which is characterized in that the control valve
It has been provided projectingly the second positive stop lug boss (321) on core (32) outer surface, the magnetic valve spring (28) is limited in described second
Between positive stop lug boss (321) and the sleeve (25).
6. the heavy oil electric-controlled fuel injector according to claim 4 for low-speed diesel engine, which is characterized in that the fuel feed hole
Plate (4) is equipped with the oil outlet (402) being connected to control cavity volume (602), and the fuel-displaced control valve group includes:
What is from top to bottom set gradually is integrally formed oil control valve valve pocket (292) and fuel-displaced out with the solenoid valve valve pocket (29)
Orifice plate (35)；The fuel-displaced orifice plate (35) is equipped with the fuel-displaced throttle orifice (351) that is connected to the oil outlet (402), and described
The oil outlet chamber (352) of fuel-displaced throttle orifice (351) connection, and the flowline (353) being connected to the oil outlet chamber (352)；It is described
Flowline (353) is connected to the back oil road (207)；
The ball valve guide rod (33) being mounted in oil control valve valve pocket (292) out, the ball valve guide rod (33) is relative to described
Control valve core (32) and the fuel-displaced throttle orifice (351) setting；
After the solenoid valve (24) are powered and the control valve core (32) is driven to move up, the ball valve guide rod (33) is described
It is moved up under oil pressure effect in control cavity volume (602), the fuel-displaced throttle orifice (351) is made to be connected to the oil outlet chamber
(352), it is described control cavity volume (602) in fuel oil pass sequentially through the oil outlet (402), the fuel-displaced throttle orifice (351),
The oil outlet chamber (352) and the flowline (353) flow into the back oil road (207)；
After magnetic valve spring (28) push the control valve core (32) to move down, the control valve core (32) pushes the ball
Valve-stem guide (33) moves down, and closes the outlet of the fuel-displaced throttle orifice (351), and blocking enters to the fuel-displaced throttle orifice
(351) fuel oil in enters in the oil outlet chamber (352).
7. the heavy oil electric-controlled fuel injector according to claim 6 for low-speed diesel engine, which is characterized in that the solenoid valve
(24) cooling chamber (204) are collectively formed between the outer wall of outer wall, the sleeve (25) and the inner wall of the oil injector body (22),
Successively aperture forms cooling oil oil input channel (209) and cooling oil oil return for the fuel injector upper body (11) and the oil injector body (22)
Road (210), the cooling oil oil input channel (209) and the cooling oil back oil road (210) are respectively communicated with the cooling chamber (204).
8. the heavy oil electric-controlled fuel injector according to claim 7 for low-speed diesel engine, which is characterized in that the sleeve
(25) it is equipped with the cooling oil via hole for being connected to the cooling chamber (204)；
The outer wall of the solenoid valve valve pocket (29), it is described go out oil control valve valve pocket (292) outer wall and the oil injector body (22)
Inner wall between mixing oil pocket (205), the fuel injector upper body (11) and the oil injector body (22) successively aperture is collectively formed
Form the mixing back oil road (208) of connection mixing oil pocket (205), the solenoid valve valve pocket (29) and the oil control valve out
The junction of valve pocket (292) is equipped with the lateral oil duct (293) for being connected to mixing oil pocket (205)；
Wherein, the cooling oil in the cooling chamber (204) is entered in the sleeve (25) by the cooling oil via hole, and according to
The secondary gap by between the sleeve (25) and the control valve core (32), the control valve core (32) and the solenoid valve valve
It covers the gap between (29) and the lateral oil duct (293) flows into the mixing oil pocket (205), enter to the oil outlet chamber
Interior fuel oil passes through gap and the lateral oil duct between the ball valve guide rod (33) and oil control valve valve pocket (292) out
(293) flow direction is into the mixing oil pocket (205), after flowing into the cooling oil in mixing oil pocket (205) and fuel oil mixing
It is discharged by the mixing back oil road (208).
9. the heavy oil electric-controlled fuel injector according to claim 6 for low-speed diesel engine, which is characterized in that the nozzle
(67) needle-valve body (61) outer surface, and the nozzle (67) and the needle-valve body are socketed in using interference fit type part
(61) it is compressed by the tight cap of nozzle (66), the oil injector body (22), the oil inlet orifice plate (4) and the needle-valve body (61)
It is compressed by the tight cap of body (65).
10. the heavy oil electric-controlled fuel injector according to claim 8 for low-speed diesel engine, which is characterized in that the electromagnetism
Upper seal (31) are equipped between valve valve pocket (29) and the inner wall of the oil injector body (22), the oil control valve valve pocket out
(292) lower seal (34) are equipped between the inner wall of the oil injector body (22), the mixing oil pocket (205) is located on described
Between sealing ring (31) and the lower seal (34).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811635342.5A CN109404189B (en) | 2018-12-29 | 2018-12-29 | Heavy oil electric control fuel injector for low-speed diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811635342.5A CN109404189B (en) | 2018-12-29 | 2018-12-29 | Heavy oil electric control fuel injector for low-speed diesel engine |
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| CN109404189A true CN109404189A (en) | 2019-03-01 |
| CN109404189B CN109404189B (en) | 2024-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811635342.5A Active CN109404189B (en) | 2018-12-29 | 2018-12-29 | Heavy oil electric control fuel injector for low-speed diesel engine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110594061A (en) * | 2019-09-26 | 2019-12-20 | 重庆红江机械有限责任公司 | Electric control common rail type heavy oil injector |
| CN111255552A (en) * | 2020-03-18 | 2020-06-09 | 上海中船三井造船柴油机有限公司 | Oil sprayer of marine low-speed diesel engine |
| CN113464337A (en) * | 2021-06-16 | 2021-10-01 | 中船动力研究院有限公司 | Common rail injector of marine diesel engine |
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| CN206681891U (en) * | 2017-04-28 | 2017-11-28 | 重庆红江机械有限责任公司 | A kind of low leakage super-pressure electric-controlled fuel injector |
| CN207935021U (en) * | 2017-08-31 | 2018-10-02 | 重庆红江机械有限责任公司 | A kind of micro- injection injector of automatically controlled pressure maintaining type |
| CN209671121U (en) * | 2018-12-29 | 2019-11-22 | 重庆红江机械有限责任公司 | A kind of heavy oil electric-controlled fuel injector for low-speed diesel engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110594061A (en) * | 2019-09-26 | 2019-12-20 | 重庆红江机械有限责任公司 | Electric control common rail type heavy oil injector |
| WO2021057018A1 (en) * | 2019-09-26 | 2021-04-01 | 重庆红江机械有限责任公司 | Electronic control common-rail-type heavy oil injector |
| GB2596882A (en) * | 2019-09-26 | 2022-01-12 | Chongqing hongjiang machinery co ltd | Electronic control common-rail-type heavy oil injector |
| GB2596882B (en) * | 2019-09-26 | 2023-06-07 | Chongqing hongjiang machinery co ltd | Electronic control common-rail-type heavy oil injector |
| CN111255552A (en) * | 2020-03-18 | 2020-06-09 | 上海中船三井造船柴油机有限公司 | Oil sprayer of marine low-speed diesel engine |
| CN111255552B (en) * | 2020-03-18 | 2023-08-15 | 上海中船三井造船柴油机有限公司 | Fuel injector of marine low-speed diesel engine and fuel system formed by fuel injector |
| CN113464337A (en) * | 2021-06-16 | 2021-10-01 | 中船动力研究院有限公司 | Common rail injector of marine diesel engine |
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| CN109404189B (en) | 2024-02-13 |
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