CN109236531A - The variable heavy oil piezoelectric fuel injector of fuel injection characteristic - Google Patents
The variable heavy oil piezoelectric fuel injector of fuel injection characteristic Download PDFInfo
- Publication number
- CN109236531A CN109236531A CN201810834726.3A CN201810834726A CN109236531A CN 109236531 A CN109236531 A CN 109236531A CN 201810834726 A CN201810834726 A CN 201810834726A CN 109236531 A CN109236531 A CN 109236531A
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- oil
- valve
- control valve
- fluid power
- compensating piston
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- 239000000446 fuel Substances 0.000 title claims abstract description 52
- 239000000295 fuel oil Substances 0.000 title claims abstract description 39
- 238000002347 injection Methods 0.000 title claims abstract description 36
- 239000007924 injection Substances 0.000 title claims abstract description 36
- 239000012530 fluid Substances 0.000 claims abstract description 111
- 239000003921 oil Substances 0.000 claims description 223
- 230000007704 transition Effects 0.000 claims description 31
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 13
- 230000009471 action Effects 0.000 claims description 12
- 238000002485 combustion reaction Methods 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 3
- 230000008901 benefit Effects 0.000 claims description 2
- 238000004891 communication Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 8
- 230000004044 response Effects 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 7
- 239000003344 environmental pollutant Substances 0.000 abstract description 6
- 231100000719 pollutant Toxicity 0.000 abstract description 6
- 230000007423 decrease Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000007921 spray Substances 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/0603—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
- 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
- F02M63/0026—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)
- Fuel-Injection Apparatus (AREA)
Abstract
The purpose of the present invention is to provide the heavy oil piezoelectric fuel injectors that fuel injection characteristic can be changed, including piezoelectricity control assembly, fluid power compensating piston and spool control valve component, needle valve assembly, tight cap and control chamber sleeve.Piezoelectricity control assembly is mounted on fuel injector top, can be realized flexible Injection strategy and responds fast, control injection process with high accuracy.Spool control valve and fluid power compensating piston are mounted below piezoelectricity control assembly, be can be realized fuel injection characteristic anxious after first delaying when fuel injector work, are conducive to the dynamic property, fuel-economy type, pollutant emission and the noise emission performance that improve engine.It can make the fast run-up pressure of control chamber when fuel injector is idle, improve the response of fuel injector.Control chamber sleeve in needle valve assembly can contact with each other to avoid fuel injector operating room needle-valve body and control valve rod.
Description
Technical field
The present invention relates to a kind of diesel engines, specifically diesel fuel system.
Background technique
Fuel injection characteristic is one of important parameter of diesel combustion, and controlling combustion process by control injection rate can be real
Existing combustion process idealization, so as to improve combustion process.The spraying rate at diesel engine fuel injecting initial stage is to determine pre-mixing combustion amount
One of key factor, in order to reduce NOx and noise, it is desirable to which initial injection rate is very low；Injection mid-term is equivalent to the diffusion combustion phase, is
Reduction soot, it is desirable to which spraying rate increases suddenly very much, and increasing with revolving speed and load, and the richness of fuel injection rate must increase
Greatly, i.e., from triangle to rectangular transition, to ensure being sufficiently mixed for fuel oil and air；The injection later period is the injection pressure reduction phase,
Generate granular material discharged one of factor since fuel-oil atmozation around here is bad, in end of injection, answer quick oil return with
Reducing rapidly for injection pressure is realized, so that the oil spout later period be made to shorten as far as possible.It can reach while improve dynamic property, combustion in this way
Oily economy, pollutant emission and noise emission performance requirement.
Summary of the invention
The purpose of the present invention is to provide the boot-shapeds that can either realize fuel injector to spray the dynamic property for improving diesel engine, fuel oil
Economy, pollutant emission and noise emission performance, and the fast run-up pressure in control chamber may be implemented, improve the spray of response speed
The variable heavy oil piezoelectric fuel injector of fuel oil meter rule.
The object of the present invention is achieved like this:
The variable heavy oil piezoelectric fuel injector of fuel injection characteristic of the present invention, it is characterized in that: including oil injector body, piezoelectricity control group
Part, fluid power compensating piston component, needle valve assembly, piezoelectricity control assembly, fluid power compensating piston component and needle valve assembly are from top to bottom
It is arranged in oil injector body；
The piezoelectricity control assembly includes valve seat, piezoelectric pile, control valve, control valve base, and valve seat is arranged at control valve bottom
Seat top, piezoelectric pile are arranged in valve seat, and the lower section of piezoelectric pile is arranged in control valve, control setting control valve in valve base and reset
Spring cavity installs control valve reset spring in control valve reset spring chamber, and the lower end of control valve is placed on control valve reset spring
In, the middle part setting control valve protrusion of control valve, control valve protrusion upper and lower end face is respectively sealing surface and control valve on control valve
Transition cavity is arranged in lower sealing surface, seat bottom portion, and servo oil oil inlet oil circuit, return flow oil oil circuit, so oily oil inlet are arranged in valve seat
Oil circuit controls setting fluid power compensating piston in valve base and is connected to oil circuit, spool control valve connection oil circuit, servo oil oil return circuit, liquid
Force compensating piston connection oil circuit, spool control valve connection oil circuit are connected to transition cavity, and it is multiple that servo oil oil return circuit is connected to control valve
Position spring cavity；
The fluid power compensating piston component includes spool control valve reset spring pedestal, spool control valve valve rod, fluid power compensation work
Plug, forms annular oil groove between spool control valve return spring holder and control valve base, the setting of spool control valve reset spring pedestal exists
It controls below valve base, spool control valve valve rod, fluid power compensating piston are located in spool control valve reset spring pedestal, control valve
Stress sliding block is set in pedestal, is spool control valve epicoele above stress sliding block, is spool control valve cavity of resorption, control below stress sliding block
The upper end connection stress sliding block of valve link is simultaneously cased with spool control valve reset spring, and spool control valve epicoele is connected to spool control valve and connects
Logical oil circuit；It is fluid power compensating piston epicoele, fluid power compensating piston middle part and spool control valve reset spring above fluid power compensating piston
Fluid power compensating piston cavity of resorption is formed between pedestal, is fluid power compensating piston guide and limit chamber below fluid power compensating piston, and fluid power is mended
It repays and is cased with fluid power compensating piston reset spring on piston, fluid power compensating piston reset spring is located in fluid power compensating piston cavity of resorption,
Fluid power compensating piston epicoele is connected to fluid power compensating piston and is connected to oil circuit, and planar sealed valve, plane is arranged in the middle part of spool control valve valve rod
Upper cavity volume is arranged in spool control valve reset spring base position where sealing valve, and the spool control valve below planar sealed valve resets bullet
Lower cavity volume is arranged in spring pedestal, and conical surface seal valve is arranged in spool control valve stem bottom, and the spool control valve above conical surface seal valve is multiple
Bottom volume chamber is arranged in position spring pedestal, and upper cavity volume is connected to annular oil groove, and lower cavity volume is connected to fluid power compensating piston cavity of resorption, bottom
Portion's cavity volume passes through control chamber draining oil communication return flow oil oil circuit；
The needle valve assembly includes nozzle, needle-valve body, control chamber sleeve, and needle-valve body is mounted in nozzle and between nozzle
Oil holding slot is formed, oil holding slot is connected to fuel oil oil inlet oil circuit, and so spout is arranged in oily oil inlet oil circuit, nozzle lower end for oil holding slot connection,
Control chamber is formed above nozzle between spool control valve reset spring pedestal, control chamber is located at below conical surface seal valve, control chamber
It is connected to fluid power compensating piston cavity of resorption and so oily oil inlet oil circuit, control chamber sleeve is arranged in control chamber, processes on control chamber sleeve
There is needle-valve return spring holder, needle-valve body top is cased with needle-valve reset spring, and needle-valve reset spring upper end withstands on needle-valve reset spring
On seat.
The present invention may also include:
1, oil return circuit is machined in fluid power compensating piston guide and limit chamber, setting communicates therewith below spool control valve cavity of resorption
Miscella oil return circuit.
2, fuel oil is entered in control chamber and oil holding slot by fuel oil oil inlet oil circuit, a part of fuel oil by annular oil groove,
Upper cavity volume, lower cavity volume, fluid power compensating piston cavity of resorption enter control chamber；After piezoelectric pile on-load voltage signal, control valve
It moves downward, the conical surface turns off servo oil oil return circuit under control valve, and servo oil oil inlet oil circuit is connected to transition cavity, servo oil warp
Transition cavity enters in spool control valve epicoele and fluid power compensating piston epicoele, spool control valve valve rod and fluid power compensating piston to
Lower movement.Control chamber draining oil circuit is opened, control chamber draining；Fluid power compensating piston moves down so that in fluid power compensating piston cavity of resorption
Fuel oil is pressed into control chamber；After piezoelectric pile is not loaded with voltage, control valve is upward under the action of control valve reset spring
Movement turns off the connection of servo oil oil inlet oil circuit and transition cavity, while servo oil oil return circuit is opened, on fluid power compensating piston
Servo oil in chamber and spool control valve epicoele vents, and fluid power compensating piston and spool control valve valve rod compensate in fluid power reset bullet respectively
Start to move upwards under the action of spring, spool control valve reset spring, fluid power compensating piston comes back to top dead center position, and control is slided
Valve valve rod moves upwards shutdown control chamber oil return circuit, and control chamber builds pressure again, and needle-valve body is taken a seat.
Present invention has an advantage that variable fuel injection characteristic may be implemented in the present invention, be conducive to the power for improving engine
Property, fuel-economy type, pollutant emission and noise emission performance, and control chamber can be made more rapidly to build pressure, it improves
The response characteristic of needle-valve.The present invention adjusts servo oil by piezoelectric pile into the switch of, oil return circuit, both can accurately control
The lift of valve processed is conducive to improve the response speed of spool control valve and fluid power compensating piston and control precision again and then improves needle-valve
Response speed, provides flexible fuel injection characteristic, effectively improves the discharge stability and economy of diesel engine.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is that piezoelectricity of the present invention controls component diagram；
Fig. 3 is fluid power compensating piston component diagram of the present invention；
Fig. 4 is needle valve assembly schematic diagram of the present invention.
Specific embodiment
It illustrates with reference to the accompanying drawing and the present invention is described in more detail:
In conjunction with Fig. 1-4, the variable heavy oil piezoelectric fuel injector of fuel injection characteristic of the present invention, including piezoelectricity control assembly 3, needle-valve group
Part 5, tight cap 6, control chamber sleeve 7, spool control valve and fluid power compensating piston component 4.3 part of piezoelectricity control assembly includes piezoelectric pile
Electrical connector 12, piezoelectric pile 22, control valve 13 and control valve reset spring 15.Piezoelectric pile 22 is mounted in valve seat 10, control valve
13 are mounted on the lower section of piezoelectric pile 22 and coupled.10 bottom of valve seat is machined with transition cavity 21.It is machined with and watches in valve seat 10
Take oily oil inlet oil circuit 1 and fuel oil oil inlet oil circuit 11.Control 9 top of valve base is machined with control valve reset spring chamber 17, control valve
Reset spring 15 is mounted in control valve reset spring chamber 17, and the lower end of control valve 13 is placed in control valve reset spring 15,
Control valve 13 has two sealing cones up and down.17 bottom of control valve reset spring chamber is machined with servo oil oil return circuit 16.Control
Fuel oil oil inlet oil circuit 11 is also machined on valve base 9, fluid power compensating piston epicoele connection oil circuit 20 is connected to spool control valve epicoele
Oil circuit 18.Fluid power compensating piston epicoele connection oil circuit 20 is connected to oil circuit 18 with spool control valve epicoele respectively at 21 phase of transition cavity
Even.It is spool control valve below piezoelectricity control assembly 3, mainly includes that stress sliding block 23, spool control valve valve rod 28 and spool control valve are multiple
Position spring 25.Stress sliding block 23 and spool control valve valve rod 28 are linked together by being threadedly engaged.Spool control valve reset spring 25
In spool control valve cavity of resorption 24.Miscella oil return circuit 26 is machined at spool control valve reset spring pedestal 27.Spool control valve valve
There is a planar sealed valve 29 in 28 middle of bar, processes on the spool control valve reset spring pedestal of 29 upper and lower ends of planar sealed valve
There are two cavity volume 33 and lower cavity volumes 32 on cavity volume.28 left end of spool control valve valve rod is fluid power compensating piston 37.Fluid power is mended
It repays 37 top of piston and is machined with positive stop lug boss, fluid power compensating piston reset spring 36 is mounted in fluid power compensating piston cavity of resorption 38.
An oil return circuit 34 is machined in 37 lower end guide and limit chamber 35 of fluid power compensating piston.28 lower end of spool control valve valve rod is needle-valve
Component 5 mainly includes control chamber sleeve 7, needle-valve reset spring 42 and needle-valve body 45.Control chamber sleeve 7 is located in control chamber 41,
It is machined with positive stop lug boss.42 upper end of the needle-valve reset spring lower end that is connected with control chamber sleeve 7 is connected with needle-valve body 45.Needle-valve
Body 45 is mounted in nozzle 43, and oil holding slot 44 is arranged between nozzle 43 and needle-valve body 45.
Fig. 1 is the overall structure diagram for the heavy oil electric-controlled fuel injector that fuel injection characteristic of the present invention can be changed, it is controlled by piezoelectricity
Component 3, needle valve assembly 5, tight cap 6, control chamber sleeve 7, spool control valve and fluid power compensating piston component 4 form.It is characterized in that: pressure
Electric control component 3 is located at fuel injector top.Piezoelectricity control assembly 3 is fluid power compensating piston and spool control valve component 4, control below
Slide valve epicoele 40, fluid power compensating piston epicoele 39 are connected to respectively at transition cavity 21.28 lower part of spool control valve valve rod is needle-valve group
Part 5.Fuel oil is entered in control chamber 41 and oil holding slot 44 by fuel oil oil inlet oil circuit 11 when fuel injector is idle, a part
Fuel oil is entered in control chamber 41 by annular oil groove 8, upper cavity volume 32, lower cavity volume 31, fluid power compensating piston cavity of resorption 38.When
After 22 on-load voltage signal of piezoelectric pile, control valve 13 is moved downward, and the conical surface 19 turns off servo oil oil return circuit 16 under control valve.It watches
Oily oil inlet oil circuit 1 is taken to be connected to transition cavity 21.Servo oil enters spool control valve epicoele 40 and fluid power by transition cavity 21
In compensating piston epicoele 39, spool control valve valve rod 28 and fluid power compensating piston 37 start to move downward.Control chamber draining oil circuit 30
It opens, control chamber 41 starts draining, the decline of 41 fuel pressure of control chamber.Fluid power compensating piston 37 moves down so that fluid power compensation is lived
Fuel oil in plug cavity of resorption 38 is pressed into control chamber 41, carries out a certain amount of fuel oil supplement to control chamber 41.So that at the beginning of oil spout
The decline of 41 fuel pressure of phase control chamber is more slow；It moves to after bottom dead center in fluid power compensating piston 37 no longer to control chamber 41
Fuel oil compensation is carried out, hereafter pressure decline is very fast in control chamber 41.Realize fuel injection characteristic anxious after first delaying.When piezoelectric pile 22 is not added
After carrying voltage, piezoelectric pile 22 resets, and control valve 13 moves upwards under the action of control valve reset spring 15, shutdown servo oil into
The connection of oil circuit 1 and transition cavity 21, while servo oil oil return circuit 16 is opened.Fluid power compensating piston epicoele 39 and control are slided
Servo oil in valve epicoele 40 starts to vent, and fluid power compensating piston 37 and spool control valve valve rod 28 are respectively in reset spring 36,25
Under the action of start to move upwards, fluid power compensating piston 37 comes back to top dead center position, and spool control valve valve rod 28 is transported upwards
Pressure is built in dynamic shutdown control chamber oil return circuit 30, the beginning of control chamber 41 again, and needle-valve body 45 is taken a seat, to terminate injection process.
Fig. 2 is that the piezoelectricity of fuel injector of the present invention controls modular construction enlarged drawing.It is by piezoelectric pile electrical connector 12, piezoelectric pile
22, control valve 13 and control valve reset spring 15 are constituted.Piezoelectric pile 22 passes through piezoelectric pile electrical connector 12 and engine electric-controlled list
Member connection, and then control rising and falling for control valve 13.Piezoelectric pile 22 is mounted in valve seat 10, and control valve 13 is mounted on piezoelectric pile 22
Lower section.10 bottom of valve seat is machined with transition cavity 21, transition cavity 21, fluid power compensating piston epicoele 39, spool control valve epicoele phase
Connection 40.Servo oil oil inlet oil circuit 1, fuel oil oil inlet oil circuit 11 and return flow oil oil circuit 2 are machined in valve seat 10.Control valve base
9 tops are machined with control valve reset spring chamber 17, and control valve reset spring 15 is mounted in control valve reset spring chamber 17, control
The lower end of valve 13 is placed in control valve reset spring 15, and control valve 13 has two sealing cones up and down.It controls on valve base 9
Sealed seat surface is matched with control valve lower sealing surface 19, and the sealed seat surface on valve seat 10 is matched with sealing surface 14 on control valve.
17 bottom of control valve reset spring chamber is machined with servo oil oil return circuit 16.Fuel oil oil inlet oil is also machined on control valve base 9
Road 11, return flow oil oil circuit 2, fluid power compensating piston connection oil circuit 20 are connected to oil circuit 18 with spool control valve.When piezoelectric pile 22 loads
After voltage, due to the inverse piezoelectric effect of piezoelectric pile 22,22 anamorphic stretching of piezoelectric pile pushes down on control valve 13, and control valve 13 leaves
Valve seat 10, servo oil oil inlet oil circuit 1 are connected to transition cavity 21.Sealing in control valve lower sealing surface 19 and control valve base 9
Face is in contact to turn off servo oil oil return circuit 16.Servo oil stream enters fluid power compensating piston epicoele 39 through transition cavity 21
In spool control valve epicoele 40.So that fluid power compensating piston 37 and spool control valve valve rod 28 move downward；When piezoelectric pile 22 powers off
Afterwards, piezoelectric pile 22 is restored to original length, and control valve 13 moves upwards shutdown servo under the action of control valve reset spring 15
Oily oil inlet oil circuit 1 is connected to lower transition cavity 21, while servo oil oil return circuit 16 is opened, fluid power compensating piston epicoele 39,
Spool control valve epicoele 40 is connected to servo oil oil return circuit 16, and spool control valve valve rod 28 and fluid power compensating piston 37 reset.
Fig. 3 is spool control valve of the present invention and fluid power compensating piston schematic enlarged-scale view.Spool control valve is by stress sliding block 23, control
Valve link 28 and spool control valve reset spring 25 are constituted.By the company of being threadedly engaged between stress sliding block 23 and spool control valve valve rod 28
It is connected together.Spool control valve reset spring 25 is mounted in spool control valve cavity of resorption 24, and spool control valve reset spring 25 not only acts as
The effect for resetting spool control valve valve rod 28, and the maximum displacement of spool control valve valve rod 28 is also limited, so that when control is slided
When valve valve rod 28 is in maximum displacement, the planar sealed valve 29 at 28 middle part of spool control valve valve rod separates upper cavity volume 33 under
The connection of cavity volume 32.It is machined with miscella oil return circuit 26 at spool control valve reset spring pedestal 27, is prevented from spool control valve
The miscella for the fuel oil that servo oil and control chamber 41 leakage that epicoele 40 leaks come up is deposited in spool control valve cavity of resorption 24
The movement of spool control valve valve rod 28 is had an impact.There is a conical surface seal valve 31 in 28 bottom of spool control valve valve rod, works as control
Conical surface seal valve 31, which is taken a seat, when valve link 26 is at top dead centre turns off control chamber draining oil circuit 30.It is not loaded in piezoelectric pile 22
When voltage, servo oil oil inlet oil circuit 1 is not connected to transition cavity 21, and servo oil cannot be introduced into spool control valve epicoele 40
In.Spool control valve valve rod 28 is under the action of spool control valve reset spring 25,28 lower end conical surface seal valve 31 of spool control valve valve rod
Turn off control chamber draining oil circuit 30, the not draining of control chamber 41.When 22 on-load voltage of piezoelectric pile, 22 anamorphic stretching of piezoelectric pile is downward
Control valve 13 is pushed, control valve 13 lifts off a seat 10, and servo oil oil inlet oil circuit 1 is connected to transition cavity 21.It is sealed under control valve
Face 19 is in contact to turn off servo oil oil return circuit 16 with the sealing surface on control valve base 9.Servo oil stream is held through lower transition
Chamber 21 enters spool control valve epicoele 40, and the active force downward by servo oil of spool control valve valve rod 28 is greater than 41 internal combustion of control chamber
The oil hydraulic coupling upward to its, spool control valve valve rod 28 start to move downward, the planar sealed valve at 28 middle part of spool control valve valve rod
29 turn off the connection between upper cavity volume 33 and lower 32 chamber of volume, and conical surface seal valve 31 moves down so that control chamber 41 and control
Chamber draining oil circuit 30 is connected to, and control chamber 41 starts draining.After piezoelectric pile 22 powers off, piezoelectric pile 22 is restored to original length, control
Valve 13 processed moves upwards the company of shutdown servo oil oil inlet oil circuit 1 and lower transition cavity 21 under the action of control valve reset spring 15
It is logical, while servo oil oil return circuit 16 is opened, transition cavity 21 is connected to servo oil oil return circuit 16 at present for this, on spool control valve
Chamber 40 starts draining, pressure reduction in spool control valve epicoele 40, and spool control valve valve rod 28 moves upwards.Upper cavity volume 33, lower appearance
Product chamber 32 is connected to annular oil groove 8, and 28 lower end conical surface seal valve 31 of spool control valve valve rod drops back into one's seat and turns off control chamber and let out
Oil circuit 30, control chamber 41 stop draining.37 upper end of fluid power compensating piston is machined with positive stop lug boss, and reset spring 36 is mounted on liquid
In force compensating piston cavity of resorption 38.It is machined with an oil return circuit 34 in fluid power compensating piston guide and limit chamber 35, prevents fluid power from mending
Repaying in the high pressure fuel leak to fluid power compensating piston guide and limit chamber 35 in piston cavity of resorption 38 influences fluid power compensating piston 37
Movement.When fuel injector is idle, since there are high pressure fuels in fluid power compensating piston cavity of resorption 38, in hydraulic coupling and spring
Fluid power compensating piston 37 is located at top dead center position under the action of pretightning force.A part of fuel oil passes through annular oil groove 8, upper cavity volume
33, lower cavity volume 32 and fluid power compensating piston cavity of resorption 38 enter in control chamber 41, so that voltage built-up rate is speeded in control chamber 41,
Improve the response of fuel injector.When fuel injector is started to work, 22 anamorphic stretching of piezoelectric pile pushes down on control valve 13, control valve 13
Lift off a seat 10, servo oil oil inlet oil circuit 1 is connected to lower transition cavity 21.In control valve lower sealing surface 19 and control valve base 9
Sealing surface be in contact and turn off servo oil oil return circuit 16.Servo oil enters lower transition cavity 21 and enters fluid power compensation and lives
Beyond the Great Wall in chamber 39,37 upper end of the fluid power compensating piston active force downward by servo oil is greater than 38 internal combustion of fluid power compensating piston cavity of resorption
The oil hydraulic coupling upward to its, fluid power compensating piston 37 start to move downward.Certain journey is carried out to control chamber 41 at oil spout initial stage
Fuel oil supplement on degree, the decline of 41 fuel pressure of control chamber is more slow, so that needle-valve body 45 engraves liter at the beginning
Relatively slowly, injection rate is increased also more slow.After piezoelectric pile 22 powers off, piezoelectric pile 22 is restored to original length, control
Valve 13 processed moves upwards the company of shutdown servo oil oil inlet oil circuit 1 and lower transition cavity 21 under the action of control valve reset spring 15
It is logical, while servo oil oil return circuit opens 16.Transition cavity 21 is connected to servo oil oil return circuit 16 at present for this, and fluid power compensation is lived
Chamber 39 starts draining beyond the Great Wall, when the servo oil pressure of fluid power compensating piston epicoele 39 decreases below the fuel pressure in cavity of resorption 38
Start to move upwards until moving at top dead centre with fluid power compensating piston 37 when the resultant force of initial tension of spring.
Fig. 4 is needle valve assembly schematic enlarged-scale view of the present invention.It is by control chamber sleeve 7, needle-valve reset spring 42 and needle-valve body
45 are constituted.It is machined with needle-valve return spring holder 46 on control chamber sleeve 7, can not only fix needle-valve reset spring 42 but also can be to needle
Valve body 45 plays position-limiting action, controls valve link 28 when preventing fuel injector from starting to work and needle-valve body 45 collides.Work as spray
When oil starts, since 41 fuel pressure of effect oil spout initial stage control chamber of fluid power compensating piston 37 declines slower, needle-valve body 45
Lifting speed is slow, and injection rate is low；Fuel injection duration for a period of time after, fluid power compensating piston 37 is no longer supplemented into control chamber 41
Fuel oil, hereafter pressure decline is very fast in control chamber 41, and needle-valve body 45, which promotes speed, to be accelerated, and injection rate is high, realizes variable oil spout
Rule is conducive to the dynamic property, fuel-economy type, pollutant emission and the noise emission performance that improve engine.Work as end of injection
When, control chamber 41 and the connection of control chamber draining oil circuit 30 are turned off, and pressure is built in the beginning of control chamber 41 again.Fuel oil a part is from combustion
Oily oil inlet oil circuit 11 enters directly into control chamber 41, and another part passes through annular oil groove 8, upper cavity volume 33, lower cavity volume 32
It is entered in control chamber 41 with fluid power compensating piston cavity of resorption 38.So that 41 voltage built-up rate of control chamber is accelerated, the sound of fuel injector is improved
It answers.
By the above-mentioned course of work it is found that in the injection process for the heavy oil electric-controlled fuel injector that fuel injection characteristic of the present invention can be changed, spray
The first slow rear anxious of fuel injection characteristic may be implemented at oil spout initial stage in fluid power compensating piston and spool control valve component 4 in oily device, favorably
In the dynamic property, fuel-economy type, pollutant emission and the noise emission performance that improve engine；It is fired in end of injection rear portion
Oil can be entered by under upper cavity volume 33, lower cavity volume 32 and fluid power compensating piston intracavitary 28 can make to control in control chamber 41
Chamber 41 processed more rapidly builds pressure, improves the response characteristic of fuel injector.Entire injection process is controlled using piezoelectricity, movement speed
Fastly, control precision is high.It realizes to injection process fast response time, controls requirement with high accuracy.
Claims (3)
1. the variable heavy oil piezoelectric fuel injector of fuel injection characteristic, it is characterized in that: including oil injector body, piezoelectricity control assembly, fluid power benefit
Piston component, needle valve assembly are repaid, oil spout is arranged in piezoelectricity control assembly, fluid power compensating piston component and needle valve assembly from top to bottom
In body；
The piezoelectricity control assembly includes valve seat, piezoelectric pile, control valve, control valve base, and valve seat setting is on control valve base
Side, piezoelectric pile are arranged in valve seat, and the lower section of piezoelectric pile is arranged in control valve, control and control valve reset spring is arranged in valve base
Chamber installs control valve reset spring in control valve reset spring chamber, and the lower end of control valve is placed in control valve reset spring, controls
The middle part setting control valve protrusion of valve processed, control valve protrusion upper and lower end face is respectively to seal under sealing surface and control valve on control valve
Transition cavity is arranged in face, seat bottom portion, and servo oil oil inlet oil circuit, return flow oil oil circuit, so oily oil inlet oil circuit, control are arranged in valve seat
Fluid power compensating piston is set in valve base processed and is connected to oil circuit, spool control valve connection oil circuit, servo oil oil return circuit, fluid power compensation is lived
Plug connection oil circuit, spool control valve connection oil circuit are connected to transition cavity, and servo oil oil return circuit is connected to control valve reset spring chamber；
The fluid power compensating piston component includes spool control valve reset spring pedestal, spool control valve valve rod, fluid power compensating piston, control
Annular oil groove is formed between slide valve return spring holder processed and control valve base, spool control valve reset spring pedestal is arranged in control valve
Below pedestal, spool control valve valve rod, fluid power compensating piston are located in spool control valve reset spring pedestal, are controlled in valve base
Stress sliding block is set, is spool control valve epicoele above stress sliding block, is spool control valve cavity of resorption, spool control valve valve below stress sliding block
The upper end connection stress sliding block of bar is simultaneously cased with spool control valve reset spring, and spool control valve epicoele is connected to spool control valve connection oil
Road；It is fluid power compensating piston epicoele, fluid power compensating piston middle part and spool control valve reset spring pedestal above fluid power compensating piston
Between form fluid power compensating piston cavity of resorption, be fluid power compensating piston guide and limit chamber below fluid power compensating piston, fluid power compensation is lived
It is cased with fluid power compensating piston reset spring beyond the Great Wall, fluid power compensating piston reset spring is located in fluid power compensating piston cavity of resorption, fluid power
Compensating piston epicoele is connected to fluid power compensating piston and is connected to oil circuit, and planar sealed valve, flat seal is arranged in the middle part of spool control valve valve rod
Upper cavity volume, the spool control valve reset spring bottom below planar sealed valve is arranged in spool control valve reset spring base position where valve
Lower cavity volume is arranged in seat, and conical surface seal valve is arranged in spool control valve stem bottom, and the spool control valve above conical surface seal valve resets bullet
Bottom volume chamber is arranged in spring pedestal, and upper cavity volume is connected to annular oil groove, and lower cavity volume is connected to fluid power compensating piston cavity of resorption, and bottom holds
Product chamber passes through control chamber draining oil communication return flow oil oil circuit；
The needle valve assembly includes nozzle, needle-valve body, control chamber sleeve, and needle-valve body is mounted in nozzle and is formed between nozzle
Oil holding slot, oil holding slot are connected to fuel oil oil inlet oil circuit, and so spout, nozzle is arranged in oily oil inlet oil circuit, nozzle lower end for oil holding slot connection
Control chamber is formed between top and spool control valve reset spring pedestal, control chamber is located at below conical surface seal valve, control chamber connection
Fluid power compensating piston cavity of resorption and so oily oil inlet oil circuit, the setting of control chamber sleeve are machined with needle on control chamber sleeve in control chamber
Valve return spring holder, needle-valve body top are cased with needle-valve reset spring, and needle-valve reset spring upper end is withstood on needle-valve return spring holder.
2. the variable heavy oil piezoelectric fuel injector of fuel injection characteristic according to claim 1, it is characterized in that: fluid power compensating piston is led
Oil return circuit, the miscella oil return circuit that setting communicates therewith below spool control valve cavity of resorption are machined in limit chamber.
3. the variable heavy oil piezoelectric fuel injector of fuel injection characteristic according to claim 1 or 2, it is characterized in that: fuel oil passes through combustion
Oily oil inlet oil circuit enters in control chamber and oil holding slot, and a part of fuel oil passes through annular oil groove, upper cavity volume, lower cavity volume, liquid
Force compensating piston cavity of resorption enters control chamber；After piezoelectric pile on-load voltage signal, control valve is moved downward, the conical surface under control valve
Servo oil oil return circuit is turned off, servo oil oil inlet oil circuit is connected to transition cavity, and servo oil enters control by transition cavity
In slide valve epicoele and fluid power compensating piston epicoele, spool control valve valve rod and fluid power compensating piston are moved downward.Control chamber draining oil
Road is opened, control chamber draining；Fluid power compensating piston moves down so that the fuel oil in fluid power compensating piston cavity of resorption is pressed into control chamber
In；After piezoelectric pile is not loaded with voltage, control valve moves upwards under the action of control valve reset spring, turns off the oil inlet of servo oil
The connection of oil circuit and transition cavity, while servo oil oil return circuit is opened, in fluid power compensating piston epicoele and spool control valve epicoele
Servo oil vent, fluid power compensating piston and spool control valve valve rod are respectively fluid power compensates reset spring, spool control valve resets bullet
Start to move upwards under the action of spring, fluid power compensating piston comes back to top dead center position, and spool control valve valve rod moves upwards pass
Disconnected control chamber oil return circuit, control chamber build pressure again, and needle-valve body is taken a seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810834726.3A CN109236531A (en) | 2018-07-26 | 2018-07-26 | The variable heavy oil piezoelectric fuel injector of fuel injection characteristic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810834726.3A CN109236531A (en) | 2018-07-26 | 2018-07-26 | The variable heavy oil piezoelectric fuel injector of fuel injection characteristic |
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| CN109236531A true CN109236531A (en) | 2019-01-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810834726.3A Withdrawn CN109236531A (en) | 2018-07-26 | 2018-07-26 | The variable heavy oil piezoelectric fuel injector of fuel injection characteristic |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6050269A (en) * | 1983-08-27 | 1985-03-19 | Yanmar Diesel Engine Co Ltd | Servo piston controlling device for plunger |
| CN104018969A (en) * | 2014-05-29 | 2014-09-03 | 哈尔滨工程大学 | Piezoelectric control pressure accumulation and stabilization oil sprayer |
| CN104632485A (en) * | 2014-12-29 | 2015-05-20 | 沪东重机有限公司 | Common-rail fuel oil jet system controlled by double electromagnetic valves and applied to low-speed diesel engine for ship |
| CN106795851A (en) * | 2014-10-15 | 2017-05-31 | 大陆汽车有限公司 | The piezoelectricity co-rail ejector of the backlash compensation part with the hydraulic pressure being integrated into servo valve |
| CN206352546U (en) * | 2017-01-18 | 2017-07-25 | 哈尔滨工程大学 | A kind of On Fluctuations oil return electric-controlled fuel injector with hydraulic feedback |
-
2018
- 2018-07-26 CN CN201810834726.3A patent/CN109236531A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6050269A (en) * | 1983-08-27 | 1985-03-19 | Yanmar Diesel Engine Co Ltd | Servo piston controlling device for plunger |
| CN104018969A (en) * | 2014-05-29 | 2014-09-03 | 哈尔滨工程大学 | Piezoelectric control pressure accumulation and stabilization oil sprayer |
| CN106795851A (en) * | 2014-10-15 | 2017-05-31 | 大陆汽车有限公司 | The piezoelectricity co-rail ejector of the backlash compensation part with the hydraulic pressure being integrated into servo valve |
| CN104632485A (en) * | 2014-12-29 | 2015-05-20 | 沪东重机有限公司 | Common-rail fuel oil jet system controlled by double electromagnetic valves and applied to low-speed diesel engine for ship |
| CN206352546U (en) * | 2017-01-18 | 2017-07-25 | 哈尔滨工程大学 | A kind of On Fluctuations oil return electric-controlled fuel injector with hydraulic feedback |
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Application publication date: 20190118 |