CN103573506B - With the Electrocontrolled high-pressure common rail oil sprayer of piezoelectric-actuator - Google Patents
With the Electrocontrolled high-pressure common rail oil sprayer of piezoelectric-actuator Download PDFInfo
- Publication number
- CN103573506B CN103573506B CN201310581748.0A CN201310581748A CN103573506B CN 103573506 B CN103573506 B CN 103573506B CN 201310581748 A CN201310581748 A CN 201310581748A CN 103573506 B CN103573506 B CN 103573506B
- Authority
- CN
- China
- Prior art keywords
- piezoelectric
- actuator
- oil nozzle
- oil
- shell
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Fuel-Injection Apparatus (AREA)
Abstract
The present invention relates to a kind of Electrocontrolled high-pressure common rail oil sprayer with piezoelectric-actuator, relate to the oil sprayer being applicable to automobile-used low emission compression ignition engine co-rail oil injection system specifically.It comprises piezoelectric-actuator shell, piezoelectric-actuator, upper shell, transmission lever, valve seat, middle shell, control piston, push rod, oil nozzle nut, oil nozzle and oil nozzle needle-valve, piezoelectric-actuator is positioned at piezoelectric-actuator shell, and piezoelectric-actuator shell is positioned at upper shell.Piezoelectric-actuator comprises multiple piezo-electric sheet, interior electrode and external electrode, and each piezo-electric sheet is vertically arranged, and multiple piezo-electric sheet stacks gradually connection along substantially horizontal.The present invention reduces the lamination number of plies that piezoelectric-actuator adds man-hour, reduce cost of production.
Description
Technical field
The present invention relates to a kind of Electrocontrolled high-pressure common rail oil sprayer with piezoelectric-actuator, relate to the oil sprayer being applicable to automobile-used low emission compression ignition engine (diesel engine) co-rail oil injection system specifically.
Background technique
Because country is to the attention of environmental protection, the Abgasgesetz of appearance is more and more stricter, requires that existing internal-combustion engine will reduce the discharge of nitrogen oxide and particle.In the various measures reducing discharge, reducing air/fuel mixture discharge is in combustion a most basic approach.The number producing discharge in combustion process depends on the abundant degree that air and fuel oil mix in a combustion chamber to a great extent.Improving the jet pressure of fuel oil can allow fuel-oil atmozation better, and air mixing evenly, before main injection, be added with the quality that pre-spray then can improve burning, reduce burning and exhausting.Improve jet pressure at present, increase injecting times thus reduce an important technology route of engine exhaust with piezoelectric-actuator as the final controlling element of oil sprayer.Piezoelectric-actuator driving force is large, higher jet pressure can be realized, simultaneously the piezoelectric-actuator response time very short (can within 0.1ms), thus accurately can control beginning that fuel sprays and close moment, easily realize multi-injection, thus realize the accurate control to burning.
Disclosing a kind of method and apparatus for controlling oil sprayer in CN200580046473.4, in this device, having the oil sprayer that a kind of piezoelectric-actuator drives.In oil sprayer disclosed in this patent, upper end is assembled with a piezoelectric crystal final controlling element, final controlling element can produce longitudinal tensile strain distortion when being connected with certain voltage, this distortion promotes valve body and runs downwards, back down the Sealing of pressure chamber, the pressure in pressure chamber reduces, and this makes to act on making a concerted effort from becoming upwards downwards on oil nozzle needle-valve, needle-valve is up, oil sprayer commencement of fuel injection; And when piezoelectric crystal final controlling element no electric circuit, due to the effect of liquid and initial tension of spring, needle-valve makes a concerted effort downwards, needle-valve compresses needle-valve body, oil sprayer not oil spout, periodic duty like this.
The Fuelinjection nozzle that another kind is equipped with piezoelectric crystal final controlling element is disclosed in CN00801593.7, its main operational principle is the elongation and reply that utilize the logical electric discharge of piezoelectric-actuator to produce, realizes fuel-injected switch by needle control valve closure body.
Also have a lot with piezoelectric crystal as the patent of the oil sprayer of final controlling element or injection valve aspect, they have employed an elementary tactics, realize the control to spraying when utilizing piezoelectric element discharge and recharge exactly along the elongation in piezo-electric sheet lamination direction and contraction.Because the unit energising elongation of current piezoelectric material is limited, therefore the piezoelectric-actuator of above-mentioned patent all needs longitudinally there is being the patch of piezoelectric material of One's name is legion to carry out lamination (or sintering).Just there are two shortcomings in this, be exactly shortcoming one carries out the patch of piezoelectric material too many (total the lift having lacked piezoelectric-actuator is inadequate) of lamination, occur between manufacture process patch of piezoelectric material that the potential safety hazard probability such as cracking, disconnection are just large, shortcoming two is exactly that number of laminations adds cost too much, and these two shortcomings seem particularly serious when extensive manufacture.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency, thus a kind of Electrocontrolled high-pressure common rail oil sprayer with piezoelectric-actuator is provided, reduce manufacture cost, easily produce in batches.
According to technological scheme provided by the invention, Electrocontrolled high-pressure common rail oil sprayer with piezoelectric-actuator comprises piezoelectric-actuator shell, piezoelectric-actuator, upper shell, transmission lever, valve seat, middle shell, control piston, push rod, oil nozzle nut, oil nozzle and oil nozzle needle-valve, upper shell lower end connects middle shell, and the oil nozzle nut compressing that middle shell lower end is threaded connection connects oil nozzle.Control piston and push rod are positioned at middle shell, and push rod is positioned at control piston lower end.Middle shell outer side wall is threaded connection fuel inlet fitting.Oil nozzle needle-valve is arranged in oil nozzle, end in contact under oil nozzle needle-valve upper end and push rod.Be provided with oil nozzle pressure chamber in oil nozzle, it is characterized in that: piezoelectric-actuator is positioned at piezoelectric-actuator shell, piezoelectric-actuator shell is positioned at upper shell.Piezoelectric-actuator comprises multiple piezo-electric sheet, interior electrode and external electrode, and each piezo-electric sheet is vertically arranged, and multiple piezo-electric sheet stacks gradually connection along substantially horizontal; One side in the surface, left and right of each piezo-electric sheet is interior electrode connection plane, and the interior electrode connection plane of multiple piezo-electric sheet is surface, the same side, and interior electrode connection plane is provided with interior electrode; The front and rear surfaces of multiple piezo-electric sheet is external electrode junction surface, and external electrode junction surface connects external electrode; The inner side surface of the external electrode in the front and rear surfaces of multiple piezo-electric sheet respectively with Electrode connection in this side, the outer side surface of the external electrode in the front and rear surfaces of multiple piezo-electric sheet is connected with external power supply respectively by wire; Described piezoelectric-actuator lower end is provided with transmission lever, transmission lever upper-end surface and piezoelectric-actuator lower end surface Mechanical Contact.Be provided with valve seat between upper shell and middle shell, form low-pressure cavity between valve seat upper-end surface and upper enclosure inner wall, valve seat lower end is provided with cavity volume, and cavity volume lower end is communicated with middle shell.Valve seat is provided with the first passage being communicated with low-pressure cavity and cavity volume, and transmission lever lower end surface and valve seat upper-end surface Mechanical Contact also seal first passage.
Further, transition block is provided with between middle shell and oil nozzle.
Further, elastic element is provided with between transmission lever and upper shell; Transmission lever is provided with seal ring, seal ring and upper enclosure inner wall close contact.
Further, between push rod and middle shell, be provided with oil nozzle spring, oil nozzle spring upper end contact middle shell inwall, oil nozzle lower spring end contact push rod.
Further, be provided with oil discharge passage in middle shell, oil discharge passage is communicated with the oil outlet on middle shell sidewall; Be provided with oil inlet passage in middle shell, oil inlet passage upper end is communicated with second channel, and side is communicated with fuel inlet fitting, and lower end is communicated with oil nozzle pressure chamber.
Further, between transmission lever and valve seat, be provided with ball sealer, ball sealer with between transmission lever, valve seat for ball face sealing contacts.
Further, between transmission lever with valve seat for conical surface seal contacts.
Further, the radial dimension of oil nozzle needle-valve bigger diameter end is less than the radial dimension of control piston bigger diameter end.
Further, interior electrode upper be positioned at its place electrode connection plane below upper below within, and the upper of interior electrode does not overlap below with the upper of interior electrode connection plane below; The limit, left and right of interior electrode is positioned within the limit, left and right of its place electrode connection plane, and in limit, interior electrode left and right while overlap with interior electrode connection plane same side form interior Electrode connection limit, relatively do not overlap with interior electrode connection plane same side with the another side on interior Electrode connection limit in limit, interior electrode left and right; Adjacent inner electrodes fillet is arranged at adj acent piezoelectric sheet left and right side interval.
Further, in the area S1 of interior electrode and its place, the proportion of the area S2 of electrode connection plane is 0.5<S1:S2<1.
Compared with the prior art the present invention has the following advantages: 1, structure of the present invention is simple, compact, reasonable, decreases the lamination number of times that piezoelectric-actuator adds man-hour, reduces the cost that lamination produces; 2, due to the minimizing of the lamination number of plies, the frequency of the faults such as the fracture that piezoelectric-actuator causes due to lamination is reduced; 3, due to the minimizing of the lamination number of plies, the number of times that the faults such as fracture occur between piezo-electric sheet in piezoelectric-actuator using process is reduced.
Accompanying drawing explanation
Fig. 1 is embodiment one structural representation.
Fig. 2 is I place enlarged view in Fig. 1.
Fig. 3 is I place enlarged view in Fig. 1 under applying certain voltage condition.
Fig. 4 is embodiment two structural representation.
Fig. 5 is embodiment three structural representation.
Fig. 6 is piezoelectric-actuator structural representation in the present invention.
Fig. 7 is piezoelectric plate structure schematic diagram in the present invention.
Fig. 8 is A-A sectional view in Fig. 6.
Fig. 9 is piezoelectric plate structure schematic diagram before energising.
Figure 10 is piezoelectric plate structure schematic diagram after energising.
Description of reference numerals: 1-piezoelectric-actuator shell, 2-piezoelectric-actuator, 3-upper shell, 4-seal ring, 5-elastic element, 6-transmission lever, 7-valve seat, 8-middle shell, 9-oil discharge passage, 10-control piston, 11-oil inlet passage, 12-push rod, 13-oil nozzle spring, 14-transition block, 15-oil nozzle nut, 16-oil nozzle, 17-oil nozzle needle-valve, 18-fuel inlet fitting, 19-low-pressure cavity, 20-first passage, 21-cavity volume, 22-second channel, 23-oil nozzle pressure chamber, 24-piezo-electric sheet, 25-ball sealer, electrode in 26-, 27-external electrode, 28-oil outlet, electrode connection plane in 29-, Electrode connection limit in 30-, 31-external electrode junction surface, 32-wire.
Embodiment
Embodiment in is by reference to the accompanying drawings further described by the present invention below:
According to the piezoelectric property of piezoelectric material, when loading certain voltage to piezoelectric material, longitudinally (if by multiple same material piezo-electric sheet vertically lamination form, longitudinally refer to the direction along piezo-electric sheet lamination) can elongation strain be produced, laterally (if by multiple same material piezo-electric sheet vertically lamination form, laterally refer to the direction along vertical piezo-electric sheet lamination) can contraction deformation be produced.Longitudinal piezoelectric strain constant d of piezoelectric material
33material impact is had, the horizontal piezoelectric strain constant d of piezoelectric material to the size of the longitudinal tensile strain distortion produced during unit piezoelectric material on-load voltage
31material impact is had to the size of the transverse shrinkage distortion produced during unit piezoelectric material on-load voltage.
The technical solution adopted in the present invention is a kind of piezoelectric-actuator 2 of design, piezoelectric-actuator 2 can be used as the final controlling element of oil sprayer, when certain voltage is applied to piezoelectric-actuator 2 charging, piezoelectric-actuator 2 can produce the contraction deformation that axial dimension reduces, and when the voltage of piezoelectric-actuator 2 is removed, piezoelectric-actuator 2 recovers the size before charging, by designing a series of middleware, utilize the charging and discharging of piezoelectric-actuator 2, realize controlling the opening and closing of oil nozzle needle-valve 17, thus the control that the fuel oil realizing oil sprayer sprays and do not spray.
As shown in Figure 8, assuming that piezo-electric sheet 24 is processed to rectangular shape, the length size of cuboid is respectively L, W, H, two planes up and down of the longitudinal direction of this piezo-electric sheet 24 there is electrode 26, the plane of two electrodes 26 is connected to the both positive and negative polarity of a voltage source respectively by wire 27, this voltage source has switch control rule, and the size of voltage source is V.As shown in Figure 9, bold portion is the shape after piezo-electric sheet 24 is energized, and dotted portion is the shape of piezo-electric sheet 24 before energising.After the applying voltage that is energized to the electrode 26 of piezo-electric sheet 24, piezo-electric sheet 24 short transverse produces elongation strain, and amount of deformation is Δ H, creates contraction deformation in length and width direction, and amount of deformation is respectively Δ L and Δ W.The large I of Δ H, Δ L, Δ W calculates according to piezoelectric equations.The boundary conditions of piezo-electric sheet 24 is approximately mechanical freedom and electrical short in the present invention, can be obtained by first kind piezoelectric equations:
S=dE，
Wherein S is strain, and d is piezoelectric strain constant (unit is m/v), and E is electric field strength (unit is v/m), wherein
Therefore the strain S of short transverse
hfor
(wherein d
33for longitudinal piezoelectric strain constant), draw Δ H=Vd
33;
The strain S of length direction
lfor
(wherein d
31for horizontal piezoelectric strain constant), draw
As can be seen from derivation above, two parameters are depended in the elongation strain longitudinally produced when single piezo-electric sheet 24 is energized: the size of the size of driving voltage and longitudinal piezoelectric strain constant of material, and the size of transverse shrinkage distortion depends on three parameters: the size of the transverse direction/longitudinal length ratio of the size of driving voltage, the size of horizontal piezoelectric strain constant and piezo-electric sheet.
The piezoelectric-actuator used in the piezo injector (being also injection valve, sparger etc.) of prior art make use of the control that the linear deformation that produces when piezo-electric sheet 24 is energized realizes oil sprayer.
As shown in Figure 7 be the structural representation of the piezoelectric-actuator of prior art.Due to longitudinal piezoelectric strain constant d of piezoelectric material conventional at present
33size be 200 ~ 800(10
-12m/v) left and right, and the driving voltage upper limit that piezoelectric material can normally work is about 200V, the elongation strain that therefore single piezo-electric sheet produces is 10
-1about um, if the total lift controlled required for oil sprayer work is 50um, then the piezoelectric-actuator of prior art will carry out the piezo-electric sheet lamination of about 500 (or more).The piezoelectric-actuator of prior art adopts the longitudinal stacked system of piezo-electric sheet to be made, and arrange electrode between piezo-electric sheet, electrode is picked out by wire.When loading certain voltage to the electrode of piezoelectric-actuator, due to the piezoelectric effect of piezo-electric sheet, elongation strain is produced along the longitudinal lamination direction of piezo-electric sheet (being Z-direction in figure), when voltage on the electrode of piezoelectric-actuator is removed, the elongation strain of Z-direction disappears, and piezoelectric-actuator is returned to the state before electrode on-load voltage.At present, in prior art piezo injector piezoelectric-actuator in single piezo-electric sheet thickness H be about 100um, length L and width W are about 5 ~ 10mm according to specific requirement, and therefore the piezoelectric-actuator size L × W × H of the lamination of 500 piezo-electric sheets is about 5x5x50mm.
In embodiment one as shown in Figures 1 to 3, the present invention mainly comprises piezoelectric-actuator shell 1, piezoelectric-actuator 2, upper shell 3, transmission lever 6, valve seat 7, middle shell 8, control piston 10, push rod 12, oil nozzle nut 15, oil nozzle 16 and oil nozzle needle-valve 17, upper shell 3 lower end connects middle shell 8, the oil nozzle nut 15 that middle shell 8 lower end is threaded connection compresses and connects oil nozzle 16, is provided with transition block 14 between middle shell 8 and oil nozzle 16.
Piezoelectric-actuator 2 is positioned at piezoelectric-actuator shell 1, and piezoelectric-actuator shell 1 is positioned at upper shell 3.As shown in Figure 6, piezoelectric-actuator 2 comprises multiple piezo-electric sheet 24, interior electrode 26 and external electrode 27, and each piezo-electric sheet 24 is vertically arranged, and multiple piezo-electric sheet 24 stacks gradually connection along substantially horizontal; One side in the surface, left and right of each piezo-electric sheet 24 is interior electrode connection plane 29, and the interior electrode connection plane 29 of multiple piezo-electric sheet 1 is surface, the same side, and interior electrode connection plane 29 is provided with interior electrode 26; The front and rear surfaces of multiple piezo-electric sheet 24 is external electrode junction surface 31, external electrode junction surface 31 connects external electrode 27; The inner side surface of the external electrode 27 in the front and rear surfaces of multiple piezo-electric sheet 24 is connected with electrode 26 in this side respectively, and the outer side surface of the external electrode 27 in the front and rear surfaces of multiple piezo-electric sheet 24 is connected with external power supply respectively by wire 32.Described interior electrode 26 upper be positioned at its place electrode connection plane 29 below upper below within, and the upper of interior electrode 26 does not overlap below with the upper of interior electrode connection plane 29 below; The limit, left and right of interior electrode 26 is positioned within the limit, left and right of its place electrode connection plane 29, and in interior electrode about 26 limit while overlap with interior electrode connection plane 29 same side form interior Electrode connection limit 30, relatively do not overlap with interior electrode connection plane 29 same side with the another side on interior Electrode connection limit 30 in interior electrode about 26 limit; Adjacent inner electrodes fillet 30 is arranged at adj acent piezoelectric sheet 24 left and right side interval.In the area S1 of described interior electrode 26 and its place, the proportion of the area S2 of electrode connection plane 29 is 0.5<S1:S2<1.
When loading certain voltage to the electrode of piezoelectric-actuator 2, due to the piezoelectric effect of multi-layer piezoelectric sheet 24, produce contraction deformation along vertical piezo-electric sheet 24 lamination direction; When the voltage on the electrode being carried in piezoelectric-actuator 2 is removed, the contraction deformation in vertical piezo-electric sheet 24 lamination direction disappears, and piezoelectric-actuator 2 returns to the state before electrode 26 on-load voltage.According to deriving herein, the contraction deformation size that piezo-electric sheet 24 energising produces is
, therefore, the size of the contraction deformation that the vertical piezo-electric sheet 24 lamination direction of the piezoelectric-actuator 2 designed by the present invention produces depends on the horizontal piezoelectric strain constant d of piezo-electric sheet 24
31, the ratio of transverse dimension L/ longitudinal size H, the voltage V be carried on electrode.According to research display, the horizontal piezoelectric strain constant d of the piezoelectric smart material of current associated mechanisms exploitation
31500(10 can be reached
-12m/V), therefore, when piezo-electric sheet 31 lateral length L long enough, namely
time enough large, when loading certain voltage, piezoelectric-actuator 2 just can produce enough axial dimension contraction deformations, thus by the structural design of oil sprayer, utilizes the spraying fire that this axial dimension contraction deformation realizes oil sprayer.Adopt about 500 of the piezo-electric sheet 24 lamination quantity hinge structure of the final controlling element 2 of the present invention's design can reduce about 10 times.3 beneficial effects can be obtained like this: one is the reduction of the lamination number of times that piezoelectric-actuator adds man-hour, reduces the cost that lamination produces; Two is the minimizings due to lamination number of times, reduces the frequency of the faults such as the fracture caused due to lamination; Three is the minimizings due to lamination number of times, reduces the number of times that the faults such as fracture occur between piezo-electric sheet in final controlling element use.Namely reduce processing cost and improve safety in utilization.
Described piezoelectric-actuator 2 lower end is provided with transmission lever 6, is provided with elastic element 5 between transmission lever 6 and upper shell 3, and transmission lever 6 bears the initial pretension active force of described elastic element 5.Transmission lever 6 upper-end surface and piezoelectric-actuator 2 lower end surface Mechanical Contact, when piezoelectric-actuator 2 produces axial dimension amoeboid movement, described transmission lever 6 can be followed the generation axial position identical with the axial dimension amoeboid movement direction of piezoelectric-actuator 2 and be moved.Transmission lever 6 is provided with seal ring 4, seal ring 4 and upper shell 3 inwall close contact.
Valve seat 7 is provided with between upper shell 3 and middle shell 8, low-pressure cavity 19 is formed between valve seat 7 upper-end surface and upper shell 3 inwall, low-voltage fuel case liquid is passed in low-pressure cavity 19, valve seat 7 lower end is provided with cavity volume 21, cavity volume 21 lower end is communicated with middle shell 8, pass into source of high pressure liquid in cavity volume 21, valve seat 7 is provided with the first passage 20 being communicated with low-pressure cavity 19 and cavity volume 21.Transmission lever 6 lower end surface and valve seat 7 upper-end surface Mechanical Contact also seal first passage 20, and when piezoelectric-actuator 2 does not produce axial dimension amoeboid movement, transmission lever 6 seals first passage 20 and low-pressure cavity 19 is not communicated with cavity volume 21; When piezoelectric-actuator 2 produces the amoeboid movement of axial dimension reduction, transmission lever 6 produces the axial position identical with the amoeboid movement direction that the axial dimension of piezoelectric-actuator 2 reduces and moves, the lower end surface of transmission lever 6 departs from first passage 20, and low-pressure cavity 19 and cavity volume 21 are interconnected.Be provided with second channel 22 in valve seat 7, second channel 22 is communicated with cavity volume 21.Described first passage 20 and second channel 22 are damp channel, and flow proportional scope is 0.5 ~ 0.9, are controlled by the pressure of fuel oil in first passage 20 and second channel 22 pairs of cavity volumes 21.
Control piston 10 and push rod 12 are positioned at middle shell 8, and push rod 12 is positioned at control piston 10 lower end.Oil nozzle spring 13 is provided with, oil nozzle spring 13 upper-end contact middle shell 8 inwall, oil nozzle spring 13 times end in contact push rods 12, the initial pretightening force of push rod 12 probe nozzle spring 13 between push rod 12 and middle shell 8.Middle shell 8 outer side wall is threaded connection fuel inlet fitting 18.Oil nozzle needle-valve 17 is arranged in oil nozzle 16, is provided with oil nozzle pressure chamber 23 in oil nozzle 16.Oil nozzle needle-valve 17 upper end and push rod 12 times end in contact.The radial dimension of described oil nozzle needle-valve 17 bigger diameter end is less than the radial dimension of control piston 10 bigger diameter end.
Be provided with oil discharge passage 9 and oil inlet passage 11 in described middle shell 8, oil discharge passage 9 is communicated with the oil outlet 28 on middle shell 8 sidewall.Oil inlet passage 11 upper end is communicated with second channel 22, and side is communicated with fuel inlet fitting 18, and lower end is communicated with oil nozzle pressure chamber 23.
When there is mechanical connection with oil nozzle 16 in oil nozzle needle-valve 17, oil nozzle needle-valve 17 stops the fuel oil in oil nozzle pressure chamber 23 to spray from the spray orifice of oil nozzle 16, when oil nozzle needle-valve 17 mechanical connection does not occur with oil nozzle 16, the fuel oil in oil nozzle pressure chamber 23 can spray from the spray orifice of oil nozzle 16.Whether oil nozzle needle-valve 17 and oil nozzle 16 mechanical connection occurs depends on stressing conditions on oil nozzle needle-valve 17.
If do not consider Action of Gravity Field, altogether by 3 power on oil nozzle needle-valve 17: the high pressure fuel in cavity volume 21 is by control piston 10, the power F1 that push rod 12 transmits, the power F2 that oil nozzle spring 13 is transmitted by push rod 12, fuel oil in oil nozzle pressure chamber 23 is to the hydraulic power F3 of oil nozzle needle-valve 17, wherein F1 with F2 direction is identical, the active force of F1 and F2 is axially downwards, the active force of F3 is axially upwards, therefore F1 and F2 plays the effect stoping oil nozzle needle-valve 17 to carry out departing from the motion of oil nozzle 16 direction, F3 plays the effect impelling oil nozzle needle-valve 17 to carry out departing from the motion of oil nozzle 16 direction, the stress balance of the location status between oil nozzle needle-valve 17 with oil nozzle 16 and oil nozzle needle-valve 17 is relevant.
In embodiment two as shown in Figure 4, and embodiment one difference is: be provided with ball sealer 25 between described transmission lever 6 and valve seat 7, ball sealer 25 with between transmission lever 6, valve seat 7 for ball face sealing contacts.
In embodiment three as shown in Figure 5, be with embodiment one difference: described transmission lever 6 with between valve seat 7 for conical surface seal contacts.
Working principle of the present invention is: high pressure fuel is introduced into oil inlet passage 11 from fuel inlet fitting 18, and afterwards, a part for high pressure fuel flows into cavity volume 21 by second channel 22, and another part of high pressure fuel enters oil nozzle pressure chamber 23.
When the electrode of piezoelectric-actuator 2 does not apply voltage, there is mechanical seal with valve seat 7 upper end and contact in transmission lever 6 lower end, first passage 20 is in closed condition, and cavity volume 21 is closed to the fuel flow path of low-pressure cavity 19.Fuel pressure in cavity volume 21 rises gradually, until identical with the pressure in oil inlet passage 11, the fuel pressure in oil nozzle pressure chamber 23 also rises gradually, until identical with the pressure in oil inlet passage 11.Because control piston 10 bigger diameter end radial dimension is greater than oil nozzle needle-valve 17 bigger diameter end radial dimension.Therefore the order of magnitude of F1 is greater than the order of magnitude of F3.Do not consider gravity effect, when piezoelectric-actuator 2 is in no electric circuit state, oil nozzle needle-valve 17 is subject to 3 power F1, F2, F3(as above-mentioned) stress balance close be F1 and F2 make a concerted effort be greater than F3, so, there is mechanical connection in oil nozzle needle-valve 17 and oil nozzle 16, the fuel oil in oil nozzle pressure chamber 23 does not spray from the spray orifice of oil nozzle 16;
When applying certain voltage to the electrode of piezoelectric-actuator 2, piezoelectric-actuator 2 produces the contraction deformation that axial direction size reduces, under the active force of elastic element 5, transmission lever 6 occurrence positions changes, there is not mechanical seal in transmission lever 6 and valve seat 7, first passage 20 is in opening state, and cavity volume 21 is communicated with low-pressure cavity 19.Because first passage 20 and the flow-rate ratio of second channel 22 are 0.5 ~ 0.9, the fuel oil inlet therefore in cavity volume 21 is less than discharge, and the fuel pressure in cavity volume 21 declines gradually, and oil nozzle needle-valve 17 is subject to F1 and reduces gradually.When F1 be decreased to F1 and F2 make a concerted effort to be less than F3 time, the stress balance of oil nozzle needle-valve 17 changes, the change in location that oil nozzle needle-valve 27 occurs along departing from oil nozzle 16 direction is moved, thus oil nozzle needle-valve 17 and injector body 16 mechanical seal do not occur, the fuel oil in oil nozzle pressure chamber 23 sprays from the spray orifice of oil nozzle 16.
So, by whether applying certain voltage to piezoelectric-actuator 2, realize the control of whether spraying with the oil sprayer 1 that piezoelectric-actuator drives to designing according to the present invention.
Because piezoelectricity type final controlling element is compared, to have driving force large and respond advantage rapidly for electricmagnetic actuator, is therefore regarded as one of important technology product of current and following combustion engine energy-saving reduction of discharging.But, because the piezo-electric sheet lamination quantity in the piezoelectric-actuator of current prior art is numerous, the lamination cost produced in final controlling element course of working occupies the pith of piezoelectric-actuator cost, and, because lamination quantity is numerous, in work in-process and use, between piezo-electric sheet and piezo-electric sheet, occur that the number of times of the potential faults such as fracture also can not be ignored.
A piezoelectric-actuator 2 is included in the present invention, after certain voltage is applied to piezoelectric-actuator 2, this piezoelectric-actuator 2 produces the contraction deformation of axial dimension, utilize piezoelectric-actuator 2 as the final controlling element of oil sprayer, by the structural design of oil sprayer, realize the control that oil sprayer is sprayed.The present invention compares existing like product, under the prerequisite of the processing cost and user cost that do not increase other component, the processing cost of piezoelectric-actuator can be reduced, reduce the user cost of piezoelectric-actuator, thus reduce processing and the user cost of whole oil sprayer.
Claims (8)
1. the Electrocontrolled high-pressure common rail oil sprayer with piezoelectric-actuator, comprise piezoelectric-actuator shell (1), piezoelectric-actuator (2), upper shell (3), transmission lever (6), valve seat (7), middle shell (8), control piston (10), push rod (12), oil nozzle nut (15), oil nozzle (16) and oil nozzle needle-valve (17), upper shell (3) lower end connects middle shell (8), and the oil nozzle nut (15) that middle shell (8) lower end is threaded connection compresses and connects oil nozzle (16); Control piston (10) and push rod (12) are positioned at middle shell (8), and push rod (12) is positioned at control piston (10) lower end; Middle shell (8) outer side wall is threaded connection fuel inlet fitting (18); Oil nozzle needle-valve (17) is arranged in oil nozzle (16), end in contact under oil nozzle needle-valve (17) upper end and push rod (12); Be provided with oil nozzle pressure chamber (23) in oil nozzle (16), it is characterized in that: piezoelectric-actuator (2) is positioned at piezoelectric-actuator shell (1), piezoelectric-actuator shell (1) is positioned at upper shell (3); Piezoelectric-actuator (2) comprises multiple piezo-electric sheet (24), interior electrode (26) and external electrode (27), each piezo-electric sheet (24) is vertically arranged, and multiple piezo-electric sheet (24) stacks gradually connection along substantially horizontal; One side in the surface, left and right of each piezo-electric sheet (24) is interior electrode connection plane (29), and the interior electrode connection plane (29) of multiple piezo-electric sheet (24) is surface, the same side, and interior electrode connection plane (29) is provided with interior electrode (26); The front and rear surfaces of multiple piezo-electric sheet (24) is external electrode junction surface (31), external electrode junction surface (31) connects external electrode ((27); The inner side surface of the external electrode (27) in the front and rear surfaces of multiple piezo-electric sheet (24) is connected with electrode (26) in this side respectively, and the outer side surface of the external electrode (27) in the front and rear surfaces of multiple piezo-electric sheet (24) is connected with external power supply respectively by wire (32); Described piezoelectric-actuator (2) lower end is provided with transmission lever (6), transmission lever (6) upper-end surface and piezoelectric-actuator (2) lower end surface Mechanical Contact; Valve seat (7) is provided with between upper shell (3) and middle shell (8), low-pressure cavity (19) is formed between valve seat (7) upper-end surface and upper shell (3) inwall, valve seat (7) lower end is provided with cavity volume (21), and cavity volume (21) lower end is communicated with middle shell (8); Valve seat (7) is provided with and is communicated with low-pressure cavity (19) and the first passage (20) of cavity volume (21), and transmission lever (6) lower end surface and valve seat (7) upper-end surface Mechanical Contact also seal first passage (20);
Described interior electrode (26) upper be positioned at its place electrode connection plane (29) below upper below within, and the upper of interior electrode (26) does not overlap below with the upper of interior electrode connection plane (29) below; The limit, left and right of interior electrode (26) is positioned within the limit, left and right of its place electrode connection plane (29), and in interior electrode (26) limit, left and right while overlap with interior electrode connection plane (29) same side form interior Electrode connection limit (30), relatively do not overlap with interior electrode connection plane (29) same side with the another side of interior Electrode connection limit (30) in interior electrode (26) limit, left and right; Adjacent inner electrodes fillet (30) is arranged at adj acent piezoelectric sheet (24) left and right side interval;
In the area S1 of described interior electrode (26) and its place, the proportion of the area S2 of electrode connection plane (29) is 0.5<S1:S2<1.
2. the Electrocontrolled high-pressure common rail oil sprayer of band piezoelectric-actuator as claimed in claim 1, is characterized in that: be provided with transition block (14) between described middle shell (8) and oil nozzle (16).
3. the Electrocontrolled high-pressure common rail oil sprayer of band piezoelectric-actuator as claimed in claim 1, is characterized in that: be provided with elastic element (5) between described transmission lever (6) and upper shell (3); Transmission lever (6) is provided with seal ring (4), seal ring (4) and upper shell (3) inwall close contact.
4. the Electrocontrolled high-pressure common rail oil sprayer of band piezoelectric-actuator as claimed in claim 1, it is characterized in that: between described push rod (12) and middle shell (8), be provided with oil nozzle spring (13), oil nozzle spring (13) upper-end contact middle shell (8) inwall, end in contact push rod (12) under oil nozzle spring (13).
5. the Electrocontrolled high-pressure common rail oil sprayer of band piezoelectric-actuator as claimed in claim 1, it is characterized in that: be provided with oil discharge passage (9) in described middle shell (8), oil discharge passage (9) is communicated with the oil outlet (28) on middle shell (8) sidewall; Be provided with oil inlet passage (11) in middle shell (8), oil inlet passage (11) upper end is communicated with second channel (22), and side is communicated with fuel inlet fitting (18), and lower end is communicated with oil nozzle pressure chamber (23).
6. the Electrocontrolled high-pressure common rail oil sprayer of band piezoelectric-actuator as claimed in claim 1, it is characterized in that: between described transmission lever (6) and valve seat (7), be provided with ball sealer (25), ball sealer (25) with between transmission lever (6), valve seat (7) for ball face sealing contacts.
7. the Electrocontrolled high-pressure common rail oil sprayer of band piezoelectric-actuator as claimed in claim 1, is characterized in that: for conical surface seal contacts between described transmission lever (6) with valve seat (7).
8. the Electrocontrolled high-pressure common rail oil sprayer of band piezoelectric-actuator as claimed in claim 1, is characterized in that: the radial dimension of described oil nozzle needle-valve (17) bigger diameter end is less than the radial dimension of control piston (10) bigger diameter end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310581748.0A CN103573506B (en) | 2013-11-19 | 2013-11-19 | With the Electrocontrolled high-pressure common rail oil sprayer of piezoelectric-actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310581748.0A CN103573506B (en) | 2013-11-19 | 2013-11-19 | With the Electrocontrolled high-pressure common rail oil sprayer of piezoelectric-actuator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103573506A CN103573506A (en) | 2014-02-12 |
| CN103573506B true CN103573506B (en) | 2016-03-16 |
Family
ID=50046058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310581748.0A Active CN103573506B (en) | 2013-11-19 | 2013-11-19 | With the Electrocontrolled high-pressure common rail oil sprayer of piezoelectric-actuator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103573506B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104612873A (en) * | 2014-12-29 | 2015-05-13 | 沪东重机有限公司 | Heavy-oil high pressure common rail fuel injection system controlled by double solenoid valves and used for marine low-speed machine |
| CN104989571A (en) * | 2015-07-10 | 2015-10-21 | 中国重汽集团重庆燃油喷射系统有限公司 | Split type control valve and oil atomizer |
| CN111579141B (en) * | 2020-04-10 | 2022-01-11 | 一汽解放汽车有限公司 | Piezoelectric actuator part packaging pretightening force detection device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2335332Y (en) * | 1997-10-31 | 1999-08-25 | 中国科学院上海硅酸盐研究所 | Transversal stretching multi-layer monolithic type piezoelectric micromotion device |
| CN101099039A (en) * | 2005-01-12 | 2008-01-02 | 西门子公司 | Method and device for controlling an injector |
| CN101622727A (en) * | 2007-02-26 | 2010-01-06 | 株式会社电装 | Laminated piezoelectric element |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0544590A (en) * | 1991-08-09 | 1993-02-23 | Hino Motors Ltd | Injection rate control device for fuel injection nozzle |
| JPH11103232A (en) * | 1997-09-26 | 1999-04-13 | Matsushita Electric Ind Co Ltd | Ceramic oscillator |
| JP4109433B2 (en) * | 2001-07-31 | 2008-07-02 | 京セラ株式会社 | Manufacturing method of multilayer piezoelectric element |
| JP2009254190A (en) * | 2008-04-09 | 2009-10-29 | Olympus Corp | Ultrasonic motor |
-
2013
- 2013-11-19 CN CN201310581748.0A patent/CN103573506B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2335332Y (en) * | 1997-10-31 | 1999-08-25 | 中国科学院上海硅酸盐研究所 | Transversal stretching multi-layer monolithic type piezoelectric micromotion device |
| CN101099039A (en) * | 2005-01-12 | 2008-01-02 | 西门子公司 | Method and device for controlling an injector |
| CN101622727A (en) * | 2007-02-26 | 2010-01-06 | 株式会社电装 | Laminated piezoelectric element |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103573506A (en) | 2014-02-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104018966B (en) | Pressure accumulation current-limiting type electromagnetic control oil sprayer | |
| CN103429877B (en) | The method of the force rate example in the nozzle needle asking for direct powered piezoelectric injector | |
| CN103573506B (en) | With the Electrocontrolled high-pressure common rail oil sprayer of piezoelectric-actuator | |
| CN103244322B (en) | Dual-fuel electromagnetic and piezoelectric control type injector | |
| CN104018964A (en) | Pressure accumulation flow-limiting type piezoelectric control oil sprayer | |
| CN103244321B (en) | Dual-fuel dual-piezoelectric control type injector | |
| CN103244324B (en) | Piezoelectric electronic-control fuel injector | |
| CN105351130A (en) | Pressurization no-leakage piezoelectric control type gas injection device | |
| CN101963119B (en) | Piezoelectric high-pressure common rail electronic control injector | |
| CN103061938B (en) | A kind of Novel dual-fuel rail injector assembly | |
| CN104196664A (en) | Conical surface sealed high pressure common rail fuel injector controller | |
| CN102900578A (en) | Piezoelectric ceramic control type internal-combustion engine fuel injector | |
| CN101691854A (en) | Novel fuel pressurization pump and pressurization system | |
| CN201496188U (en) | Electric control diesel fuel injector driven by electrostriction element | |
| CN103306871B (en) | A kind of Hydraulically-assistquick quick on-off electrical control oil injector for diesel engine and method thereof | |
| CN104879258A (en) | Hydraulic amplifying type ultrahigh-pressure fuel supply device | |
| CN202325954U (en) | Low-fuel return type piezoelectric control fuel injector | |
| RU66791U1 (en) | SMALL PIEZO ELECTRIC VALVE FOR AUTOMATION SYSTEMS | |
| CN101956635B (en) | Electronically controlled diesel injector driven by electrostriction element | |
| CN203925839U (en) | Pressure accumulation current-limiting type piezoelectric control fuel injector | |
| CN105756820A (en) | Combined pressurizing electromagnetic fuel oil injection and non-pressurizing piezoelectric fuel gas injection mixed fuel injection device | |
| CN105756829A (en) | Combined mechanical fuel oil injection and pressurizing piezoelectric fuel gas injection mixed fuel injection device | |
| CN201221425Y (en) | High pressure common rail fuel injector | |
| EP1136691A3 (en) | Internal combustion engine fuel injector, and relative method of classifying and selecting a series of injectors | |
| CN200958445Y (en) | Coordinated electricall-controlled fuel-oil jetting system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: CHINA FAW GROUP CORPORATION Effective date: 20140530 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20140530 Address after: 214063 Jiangsu province Binhu District of Wuxi City Qian Rong Lu No. 15 Applicant after: Wuxi Oil Pump Nozzle Institute of First Automobile Works Applicant after: China FAW Group Corporation Address before: 214063 Jiangsu province Binhu District of Wuxi City Qian Rong Lu No. 15 Applicant before: Wuxi Oil Pump Nozzle Institute of First Automobile Works |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |