CN106286056A - Fuel injection nozzle - Google Patents
Fuel injection nozzle Download PDFInfo
- Publication number
- CN106286056A CN106286056A CN201610470844.1A CN201610470844A CN106286056A CN 106286056 A CN106286056 A CN 106286056A CN 201610470844 A CN201610470844 A CN 201610470844A CN 106286056 A CN106286056 A CN 106286056A
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- China
- Prior art keywords
- piece
- needle
- fuel
- spray orifice
- lift amount
- Prior art date
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- Granted
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- 239000000446 fuel Substances 0.000 title claims abstract description 164
- 238000002347 injection Methods 0.000 title claims abstract description 69
- 239000007924 injection Substances 0.000 title claims abstract description 69
- 239000007921 spray Substances 0.000 claims abstract description 122
- 230000002093 peripheral effect Effects 0.000 claims abstract description 8
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims 1
- 238000005507 spraying Methods 0.000 description 19
- 230000035515 penetration Effects 0.000 description 18
- 238000001816 cooling Methods 0.000 description 7
- 239000000779 smoke Substances 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 210000000352 storage cell Anatomy 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000012190 activator Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000003313 weakening effect Effects 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
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1866—Valve seats or member ends having multiple cones
-
- 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
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 present invention relates to a kind of fuel injection nozzle for electromotor (1).Spray orifice (7) is circumferentially arranged, and includes the entrance (31) being positioned on bag-shaped room (8) inner peripheral surface respectively.Known: φ Dy is injection diameter (φ D) axial component vertically of each spray orifice (7)；L0 is the axial distance when needle-like piece (2) closes fuel channel (13) from each entrance (31) center of spray orifice (17) to whole needle-like piece (2) end (17)；L is the lift amount of needle-like piece (2), when the lift amount (L) of needle-like piece (2) is less than the threshold value preset, meet relation │ L L0 │ ＞ φ Dy/2, and when the lift amount (L) of needle-like piece (2) is more than this threshold value, meet relation: │ L L0 │≤φ Dy/2.
Description
Technical field
It relates to a kind of fuel injection nozzle directly spraying fuel to the combustor of electromotor.
Background technology
The fuel injection nozzle of conventional suggestion includes nozzle body and needle-like piece, and needle-like piece is contained in (example in nozzle body
As, see JP2010-174819A).In cone and with the end of needle-like piece out of engagement with seat surface be arranged on nozzle body
On side.The respective entrance of spray orifice is opened on the inner peripheral surface of bag-shaped room, and these spray orifices are arranged on the described side of nozzle body.
Two taper seats that external diameter is gradually reduced are formed at this end of needle-like piece.Above-mentioned fuel injection nozzle makes the end of needle-like piece
Departing from from seat surface to inject fuel into combustor, wherein fuel flows through bag-shaped room from the upstream of fuel channel and enters into
In spray orifice.
For the diesel combustion to the air-fuel mixture self-ignition of fuel and air, it is desirable to reduce cooling
Loss and exhaust smoke level.In order to reduce cooling loss, need to weaken fuel and be ejected into combustor by the spray orifice of fuel injection nozzle
Spraying penetration power.Therefore, injected fuel spray can not easily arrive the wall of combustor to reduce from combustion chamber wall surface to cooling
The thermal exposure of medium.Thus, it is possible to reduce the cooling loss of electromotor.In order to reduce exhaust smoke level, need to strengthen the spray of fuel
Mist penetration power.Therefore, injected fuel spray arrives farther, and the air utilization ratio in combustor is thus improved such that it is able to obtain
Obtain fired state well.Therefore, it is possible to minimizing exhaust smoke level.
If the lift amount of needle-like piece is more than threshold value, then when penetration power of spraying weakens, exhaust smoke level trends towards increasing.If
The lift amount of needle-like piece is less than threshold value, then when penetration power of spraying is strengthened, cooling loss trends towards increasing.Therefore, when needle-like piece
When lift amount is more than threshold value, spraying penetration power needs to strengthen, and when the lift amount of needle-like piece is less than threshold value, spraying penetration power needs
Weaken.
Summary of the invention
The disclosure solves at least one in the problems referred to above.Therefore, a purpose of the disclosure is to provide a kind of fuel spray
Penetrating nozzle, it can strengthen spraying penetration power when the lift amount of needle-like piece is more than threshold value, and can be in the lift of needle-like piece
Amount is less than weakening spraying penetration power during threshold value.
In order to realize the purpose of the disclosure, it is provided that a kind of fuel injection including nozzle body and needle-like piece for electromotor
Nozzle.Nozzle body is tubular, and it includes multiple spray orifice, fuel channel, the seat surface of cone and bag-shaped room.Fuel is by multiple sprays
Hole is ejected in the combustor of electromotor.Fuel channel is formed at the upstream side of multiple spray orifice.Seat surface limits fuel channel.Bag
Shape room is arranged on the downstream of fuel channel.Circumferentially, it includes laying respectively on bag-shaped indoor side face multiple spray orifices circle
Entrance.Needle-like piece moves with the axial reciprocating along nozzle body in being contained in nozzle body, and needle-like piece includes annular seats and cone
End extension.Seat portion and seat surface are out of engagement with to close or to open fuel channel.End extension is positioned at the downstream in a portion
Side, and when seat portion engages with seat surface, this end extension divides and is positioned in bag-shaped room.Assuming that: φ Dy is the plurality of
Each injection diameter in spray orifice axial component vertically；L0 when needle-like piece close fuel channel time from multiple spray orifices
Each center in entrance is to the axial distance of whole needle-like piece one end；L is the lift amount of needle-like piece, when the lift of needle-like piece
Measure and when being less than the threshold value preset, meet relation: │ L-L0 │ ＞ φ Dy/2, meet pass when the lift amount of needle-like piece is more than this threshold value
System: │ L-L0 │≤φ Dy/2.
Accompanying drawing explanation
From detailed description with reference to the accompanying drawings, above and other objects, features and advantages of the disclosure will become more
Add directly perceived.In the accompanying drawings:
Fig. 1 is the sectional view illustrating the fuel injection nozzle according to an embodiment；
Fig. 2 is the figure of the major part of the fuel injection nozzle illustrating this embodiment；
Fig. 3 is the figure of the major part of the fuel injection nozzle illustrating this embodiment；
Fig. 4 A is to schematically show the fuel sectional view in bag-shaped room flow situation according to this embodiment；
Fig. 4 B is to schematically show the fuel sectional view in bag-shaped room flow situation according to this embodiment；
Fig. 5 is the figure illustrating threshold value for needle-like piece lift amount according to this embodiment；
Fig. 6 is the figure illustrating threshold value for needle-like piece lift amount according to this embodiment；
Fig. 7 is the figure illustrating threshold value for needle-like piece lift amount according to this embodiment；
Fig. 8 is to illustrate, according to this embodiment, the sequential chart that the jet angle from fuel injection nozzle injection fuel changes.
Detailed description of the invention
Hereinafter with reference to accompanying drawing, embodiment is described.
It is explained below the structure of the fuel injection nozzle of embodiment.Fig. 1 to Fig. 8 shows and embodiment of the disclosure.This
The Fuelinjection nozzle of embodiment is contoured to correspond in each cylinder of the electromotor for making the vehicle of such as automotive-type advance.Adopt
With diesel engine with direct injection as this electromotor.
Fuelinjection nozzle comprises direct fuel injection into the fuel injection nozzle 1 in the combustor of electromotor.Fuel sprays
Penetrate nozzle 1 include along the needle-like piece 2 of its axially reciprocating and there is cylinder form accommodate the nozzle body 3 of this needle-like piece 2.Pin
Shape part 2 includes the main part 4 of cylinder, the seat portion 5 of annular and the end extension 6 of cone.The motive force of back-moving spring is executed
Add to this needle-like piece 2.Nozzle body 3 includes spray orifice 7 and bag-shaped room 8.Spray orifice 7 and bag-shaped room 8 are arranged in nozzle body 3 end side
At pouch portions 9.Setting can come for nozzle body 3 with the seat surface 10 that seat portion 5 engages.Fuel storage cell 12 is arranged on nozzle body
In 3, wherein fuel under high pressure produces parts from the high pressure such as supplying pump or common rail etc and is incorporated into this fuel by teasehole 11
In storage room 12.
Bag-shaped room 8 is positioned at the downstream of fuel channel 13.This bag-shaped room 8 is distributor chamber, and it will be by fuel channel 13 ring
The fuel of shape flowing merges and stores temporarily these fuel, is then uniformly distributed by fuel and is supplied to spray orifice 7.Bag
The inner peripheral surface of shape room 8 includes the cylindrical periphery wall surface centered by the axis of nozzle body 3, and with the bag on nozzle body 3 axis
Spherical bottom wall surface centered by center.Seat surface 10 is cone, and its internal diameter is gradually reduced towards side.Drive needle-like piece 2
It is connected with nozzle body 3 opening the actuator of valve.Use solenoid actuator or piezo actuator as this actuator.Omit
To back-moving spring and the description of actuator.
The seat surface 10 of needle-like piece 2 and nozzle body 3 is positioned at the fuel of spray orifice 7 upstream side leads to out of engagement with to close or to open
Road 13.Main part 4 is supported by the pilot hole 14 of nozzle body 3 such that it is able to reciprocatingly slide on pilot hole 14.Main part 4 includes
The outer peripheral face of fuel channel 13 is limited between main part 4 and nozzle body 3.It is formed in circular cone in the end of main part 4
The inclined-plane 15 that shape, its external diameter are gradually reduced towards side.Seat portion 5 be formed at inclined-plane 15 and end extension 6 taper seat 16 it
Between.As in figure 2 it is shown, the seat in seat portion 5 a diameter of φ d.
End extension 6 has the coniform shape centered by its axis.When seat portion 5 engages with seat surface 10, this end
End extension 6 is positioned in bag-shaped room 8.End extension 6 stretches out from seat portion 5 towards the side of needle-like piece 2.End extension 6
End 17 is equivalent to the end of whole needle-like piece, and it is configured to undercut parts, is used for preventing and the diapire table of bag-shaped room 8
Face is interfered.This end 17 is tabular surface, and have using the axis of needle-like piece 2 as its center is round-shaped.End extension 6
This end 17 can be the summit of taper seat.Fuel channel 13 is formed between needle-like piece 2 and seat surface 10, and is formed at needle-like
Between the inner peripheral surface of part 2 and nozzle body 3.Fuel channel 13 is positioned at the upstream side of bag-shaped room 8.Fuel channel 13 is positioned at fuel storage
The downstream of room 12.
In fuel injection nozzle 1, when seat portion 5 engages with seat surface 10, fuel channel 13 is closed.Therefore, fuel will not
It is ejected in combustor by spray orifice 7.In fuel injection nozzle 1, when seat portion 5 rises from seat surface 10, fuel channel 13 dozens
Open.Therefore, fuel is incorporated in the bag-shaped room 8 connected with spray orifice 7 from fuel channel 13.Thus, fuel is sprayed by spray orifice 7
In combustor.In fuel injection nozzle 1, when needle-like piece 2 starts to promote, needle-like piece is by low lifting LS and Gao Ti in period
The period of liter, LL was moved upwards up to complete raised position.Therefore, in fuel injection nozzle 1, in whole fuel injection period, needle-like
The lift amount of part 2 changes to complete raised position from fully closed position.Low lifting LS in period is the fuel in little lift amount
Injection timing, thus the lift amount of needle-like piece 2 is less than threshold value.When high lifting LL in period is the fuel injection in high-lift amount
Phase, thus the lift amount of needle-like piece 2 is more than threshold value.
The feature of the fuel injection nozzle of the present embodiment is described below.Spray orifice 7 has the bag-shaped of bottom in cylindrical
Part 9 inside and outside between connect.For example, it is possible to arrange 6 to 12 spray orifices 7.In the present embodiment, 10 sprays it are provided with
Hole 7.The axis of nozzle body 3 is referred to as nozzle-axis Y.The axis of each spray orifice 7 is referred to as spray orifice axis HL.Spray orifice 7 is set to radially
Stretch out, be its center with the precalculated position on nozzle-axis Y.These spray orifices 7 are formed at regular intervals at circumferencial direction,
Thus injected fuel spray F1, F2 are effectively dispersed in each combustor.All of spray orifice 7 all has and identical is clipped in spray orifice axis
Angle between HL and nozzle-axis Y.All of spray orifice 7 all has identical injection diameter and identical ejection orifice channels length.
Each spray orifice 7 is included in the spray orifice entrance 31 of the inner peripheral surface upper shed of pouch portions 9 and outside pouch portions 9
The spray orifice outlet 32 of side face upper shed.Each spray orifice 7 is straight spray orifice, and its aisle spare exports from spray orifice entrance 31 to spray orifice
32 are not changed in.In Fig. 2 to Fig. 4 B, each spray orifice 7 makes a reservation for both relative to the inclination radially downward being perpendicular to nozzle-axis Y
Angle.The center of each spray orifice entrance 31 is formed on the boundary between perpendicular wall surfaces and the bottom wall surface of bag-shaped room 8.Bag
Shape room 8 is included in the entrance side opening at crestal line 31, and crestal line described here is annular, is formed at the downstream of seat surface 10.Bag-shaped
Spatial volume in room 8 changes according to the lift amount of needle-like piece 2.Specifically, when needle-like piece 2 promotes in the upward direction,
The spatial volume of bag-shaped room 8 becomes big.
Time when the lift amount of needle-like piece 2 is less than threshold value is referred to as the low lifting time of needle-like piece 2.It is formed at seat surface
The aisle spare around seat portion 5 between 10 and seat portion 5 is referred to as an aisle spare α.The summation of the aisle spare of spray orifice 7 is claimed
Make spray orifice overall channel area β.Fuel injection nozzle 1 is constructed such that to be formed at seat surface 10 in the low lifting time of needle-like piece 2
With the seat aisle spare α between seat portion 5 is less than spray orifice overall channel area β, wherein spray orifice overall channel area β is the passage of spray orifice 7
The summation of area.Seat aisle spare α is to run through whole fuel in the low lifting time of needle-like piece 2 to be injected in nozzle body 3 formation
Fuel channel in smallest passage area MA.
Time when the lift amount of needle-like piece 2 is more than threshold value is referred to as the high lifting time of needle-like piece 2.Fuel injection spray
Mouth 1 is constructed such that to be more than spray orifice overall channel area β at the high lifting time seat aisle spare α of needle-like piece 2.Spray orifice overall channel
Area β is to run through, in the high lifting time of needle-like piece 2, the smallest passage area MA that whole fuel sprays.This smallest passage area MA
The smallest passage area being formed in the fuel channel in nozzle body 3, particularly from fuel storage cell 12 to each spray orifice
Smallest passage area in the fuel channel area of outlet 32.
In low lifting time and the high lifting time of needle-like piece 2, the fuel injection nozzle 1 of the present embodiment defines end and stretches
Go out the axial distance L0 between the end 17 in portion 6 and the center of each spray orifice entrance 31.The injection diameter φ D of spray orifice 7 is vertically
Axial component be φ Dy.End when needle-like piece 2 closes valve closing, from the center of each spray orifice entrance 31 to end extension 6
The axial distance of 17 is L0.The lift amount of needle-like piece 2 is L.
In the low lifting time of needle-like piece 2, meet the relation of │ L-L0 │ ＞ φ Dy/2.On the other hand, at the height of needle-like piece 2
The lifting time, meet the relation of │ L-L0 │≤φ Dy/2.It should be noted that the low lifting time needle-like piece 2 at needle-like piece 2
Low lift amount, compared to the high lift amount of the high lifting time needle-like piece 2 at needle-like piece 2, takes bigger value.
The above-mentioned threshold value being used for needle-like piece lift amount will be described in detail with reference to Fig. 5 to Fig. 7.As it is shown in figure 5, carry corresponding to low
(in this period, seat leads to for LS in the period of liter (in this period, seat aisle spare α is less than spray orifice overall channel area β) and high lifting LL in period
Road area α is more than spray orifice overall channel area β) between the lift amount of needle-like piece 2 on border be arranged to threshold value.The longitudinal axis in Fig. 5
Representing the lift amount of needle-like piece, the transverse axis in Fig. 5 represents the magnitude relationship between α and β.Specifically, the relation between α and β
When being expressed as α ＜ β, the lift amount of needle-like piece is less than the low lift amount of threshold value, and fuel injection amount is less than the little spray of predetermined value
The amount of penetrating.When relational representation between α and β is α ＞ β, the lift amount of needle-like piece is greater than the high lift amount of threshold value, and fuel sprays
Amount is greater than the big emitted dose of predetermined value.
As shown in Figure 6, corresponding to seat aisle spare α be nozzle interior passage smallest passage area MA expanded reach and
Spray orifice overall channel area β is the liter of the needle-like piece on the border between the expanded reach of the smallest passage area MA of nozzle interior passage
Journey amount could be arranged to threshold value.The longitudinal axis in Fig. 6 represents the lift amount of needle-like piece, and the transverse axis in Fig. 6 represents MA=α and MA=β
Between relation.Specifically, when the relational representation between MA and α is MA=α, the lift amount of needle-like piece is less than the low of threshold value
Lift amount, fuel injection amount is less than the little emitted dose of predetermined value.When relational representation between MA and β is MA=β, needle-like piece
Lift amount be greater than the high lift amount of threshold value, fuel injection amount is greater than the big emitted dose of predetermined value.
As it is shown in fig. 7, be TM when needle-like piece 2 is promoted to, from its fully closed position, the time that intermediate lift position takies,
And needle-like piece 2 from its fully closed position be promoted to time that complete raised position takies be TF time, TM can be would correspond to
The lift amount of needle-like piece be set to threshold value.The longitudinal axis represents the lift amount of needle-like piece in the figure 7, and transverse axis represents that needle-like piece 2 is complete from it
Full-application position is promoted to the time that complete raised position is passed.In this case, measurement starts lifting from needle-like piece 2
The time of this measurement, to being converted into time of α ＞ β from α ＜ β, can be set as TM by the time.Measure and start to promote from needle-like piece 2
Time to being converted into time of MA=β from MA=α, the time of this measurement can be set as TM.
Therefore, in the period from T0 to TM, the lift amount of needle-like piece is less than the low lift amount of threshold value, and fuel injection amount is
Little emitted dose less than predetermined value.In the period from TM to TF, the lift amount of needle-like piece is greater than the high lift amount of threshold value, fuel
Emitted dose is greater than the big emitted dose of predetermined value.Such as, according to the volume of end extension 6, the spatial volume of bag-shaped room 8, spray
The overall channel area in hole or the lifting speed of needle-like piece, can change above-mentioned threshold value to bigger needle-like piece lift amount side or change
Change to less needle-like lift amount side.In the present embodiment, the 50% of complete lift amount is set the threshold to.It is of course also possible to
Set the threshold to the arbitrary value in the range of the 30-70% of complete lift amount.
Explain in the low lifting time of needle-like piece 2 hereinafter with reference to Fig. 1 and Fig. 4 A, fuel flowing feelings in bag-shaped room 8
Shape.The side that seat portion 5 moves to when seat portion 5 departs from from seat surface 10 is referred to as upside vertically.When seat portion 5 engages with seat surface 10
Time the side that moves to, seat portion 5 be referred to as downside vertically.In the low lifting time of needle-like piece 2, between L, L0 and φ Dy
Relation is set as meeting │ L-L0 │ ＞ φ Dy/2.Decline φ Dy/ along the direction of nozzle-axis Y from the center of spray orifice entrance 31
The position of 2 is referred to as reference position.In this case, at the low lifting time of needle-like piece 2, the end of end extension 6 17
Downside in this reference position.In this case, the relational representation between α and β is α ＜ β, and MA=α.
Therefore, seat aisle spare α is smallest passage area MA, and fuel is flowed into the stream bag-shaped room 8 from fuel channel 13
Dynamic speed to be faster than the high lifting time.Owing to spray orifice overall channel area β is more than seat aisle spare α, in therefore fuel passes spray orifice 7
The flowing velocity in portion and spray orifice outlet flow rate are all slower than the high lifting time.Compared to fuel channel 13, the passage of bag-shaped room 8
Area Quick Extended.In this case, the most of fuel being flowed into bag-shaped room 8 from the fuel channel 13 of upstream side along
The Surface runoff of end extension 6.It follows that the fuel split away off from the end of end extension 6 flows along nozzle-axis Y
Enter on downstream the bottom wall surface of bag-shaped room 8, and periphery with bag-shaped room 8 acutangulates in the bottom wall surface of bag-shaped room 8
Ground slight curvature.Subsequently, the fuel swirled in the bottom wall surface of bag-shaped room 8 flows to upside from the downside of bag-shaped room, and the most curved
Song is flowed in spray orifice 7 to be passed through respective spray orifice entrance 31 to the periphery of bag-shaped room 8.
On the other hand, a part of fuel being flowed into bag-shaped room 8 from fuel channel 13 is along the perpendicular wall surfaces of bag-shaped room 8
Flow to the downside of bag-shaped room 8.Then, have flowed into the periphery of fuel on the downside of bag-shaped room 8 and bag-shaped room 8 acutangulate somewhat
Bending, in order to be flowed in spray orifice 7 by respective spray orifice entrance 31.Therefore, the fuel on the upside of the downside of bag-shaped room 8 flows to
With from the upside of bag-shaped room 8 flow on the downside of fuel at each spray orifice entrance 31 at collide each other.As a result, by each
Turbulization in fuel inside spray orifice 7.Due to turbulization in by the fuel inside each spray orifice 7, therefore for from
Each spray orifice 7 is ejected into the injection characteristics of the fuel of combustor, represents with solid line in Fig. 8 as shown in Figure 4 A, it is possible to obtain this
The injection characteristics of sample: the i.e. jet angle of the injected fuel spray F1 jet angle more than injected fuel spray F2, and the spraying of injected fuel spray F1 is worn
The power spraying penetration power less than injected fuel spray F2 thoroughly.
Explain in the high lifting time of needle-like piece 2 hereinafter with reference to Fig. 1 and Fig. 4 B, fuel flowing feelings in bag-shaped room 8
Shape.In the high lifting time of needle-like piece 2, it is set as meeting │ L-L0 │≤φ Dy/2 by the relation between L, L0 and φ Dy.Along spray
The direction of mouth axis Y rises the position of φ Dy/2 from the center of spray orifice entrance 31 and is referred to as upper reference position.Along nozzle shaft
The direction of line Y declines the position of φ Dy/2 and is referred to as lower reference position from the center of spray orifice entrance 31.In this case,
In the high lifting time of needle-like piece 2, the end 17 of end extension 6 scope between upper reference position and lower reference position
In.In this case, the relational representation between α and β is α ＞ β, and MA=β.
Therefore, spray orifice overall channel area β is smallest passage area MA, and fuel is flowed into bag-shaped room 8 from fuel channel 13
Flowing velocity to be slower than the low lifting time.Owing to spray orifice overall channel area β is less than seat aisle spare α, therefore through each spray orifice 7
Fuel flow rate and the spray orifice outlet flow rate of inner side are all faster than the low lifting time.Compared to bag-shaped room 8, spray orifice overall channel
Area β quickly reduces.In this case, the most of fuel being flowed into bag-shaped room 8 from fuel channel 13 stretches out from end
Come off at the surface in portion 6 and the crestal line 33 of close bag-shaped room 8 entrance.Then, de-at the surface of end extension 6 and crestal line 33
The fuel fallen relaxes with major diameter in bag-shaped room 8 and bends to outside, in order to be flowed into spray orifice 7 through respective spray orifice entrance 31
In.Therefore, will not in by the fuel inside each spray orifice 7 turbulization.It is ejected into combustion from each spray orifice 7 relative to fuel
Burn the injection characteristics of room, represent with solid line in Fig. 8 as shown in Figure 4 B, it is possible to obtain such feature: i.e. injected fuel spray F2's
Jet angle is less than the jet angle of injected fuel spray F1, and the spraying that the spraying penetration power of injected fuel spray F2 is more than injected fuel spray F1 penetrates
Power.Therefore, the high lifting time at needle-like piece 2 is capable of powerful spraying penetration power.In the low lifting time of needle-like piece 2,
This spraying penetration power is weakened.
Hereinafter report is used for the experimental result of the present embodiment.Will explain when needle-like piece promotes from its fully closed position
During to complete raised position, the experimentation how jet angle of fuel changes.Experimental result is as illustrated in the graph of figure 8.Aobvious and
It is clear to, from the chart of Fig. 8, can be seen that the low lifting LS in period at needle-like piece 2, compared to traditional fuel injection spray
Mouth, the fuel injection nozzle 1 of the present embodiment trends towards having broader angle and lower penetrates injection.Figure also show
The high lifting LL in period of needle-like piece 2, compared to the fuel injection nozzle 1 of the present embodiment, traditional fuel injection nozzle trends towards
There is broader angle and lower penetrate injection.
The longitudinal axis in Fig. 8 represents the spray angle of fuel, and transverse axis represents when needle-like piece 2 is promoted to from its fully closed position
The time that raised position is passed completely.Needle-like piece 2 from its fully closed position be promoted to shared by intermediate lift position time
Between be TM, it is TF that needle-like piece 2 is promoted to the time shared by complete raised position from its fully closed position.Solid line in Fig. 8
Representing the characteristic curve CN of the fuel injection nozzle 1 of the present embodiment, the short dash line in Fig. 8 represents the spy of traditional fuel injection nozzle
Levy line EN.
Therefore, the low lifting time at needle-like piece 2 can weaken spraying penetration power.Therefore, it is possible to carry the low of needle-like piece 2
The time of liter reduces cooling loss.The spraying penetration power of fuel can be strengthened in the high lifting time of needle-like piece 2.Therefore, it is possible to
The high lifting time of needle-like piece 2 reduces exhaust smoke level.Thus, the fuel injection nozzle 1 of the present embodiment is obtained in that and both reduces cooling
Loss reduces again the effect of exhaust smoke level.
The variants of the present embodiment explained below.In the present embodiment, it has been described that the disclosure is applied to spray high pressure
In the fuel injection nozzle 1 of fuel, wherein said fuel under high pressure is introduced directly into the combustor of electromotor from supply pump or common rail
In.But, the disclosure also apply be applicable to such fuel injection nozzle: i.e. fuel is from such as line fuel pump or distribution formula fuel
The fuel-injection pump of pump etc is entered fuel storage cell by direct force feed.The fuel pressure indoor when fuel storage exceedes pushing away of spring
During power, needle-like piece opens valve, and fuel injection nozzle is directly to direct injection type engine spray fuel.
In the present embodiment, it has been described that embodiment of the disclosure that to be applied to needle-like piece 2 complete from it when fuel sprays
Full-application position is promoted to the such fuel injection nozzle of complete raised position 1.But, the disclosure can also be applied to rise
In the fuel injection nozzle 1 that journey amount is variable, wherein the emitted dose required for electromotor is less than the feelings of the little emitted dose of predetermined value
Under shape, needle-like piece 2 is promoted to low raised position from its fully closed position, and the emitted dose required for electromotor is more than predetermined value
Big emitted dose when needle-like piece 2 from its fully closed position promote paramount raised position.Even at needle-like piece 2 from it
Fully closed position is promoted in the such fuel injection nozzle of complete raised position 1, if the energising period of actuator
Short, although then needle-like piece 2 realizes promoting completely from its fully closed position, but needle-like piece 2 is also only capable of being promoted to its low lifting position
Put.
In the present embodiment, it has been described that embodiment of the disclosure that being applied to have constant needle-like piece promotes speed
In fuel injection nozzle 1.But, the disclosure can also be applied to the lifting speed of needle-like piece in the lifting process of needle-like piece and change
In the fuel injection nozzle become.Additionally, the disclosure can apply in the fuel injection nozzle 1 of the stage lifting of needle-like piece 2.?
In the present embodiment, fuel injection nozzle 1 is configured to the needle-like piece 2 of fuel injection nozzle 1 directly by solenoid actuator or pressure
The drive force of electric actuator opens valve, and closes valve by the motive force of spring.It would however also be possible to employ helical
Pipe valve or piezo-activator are as driving the needle-like piece 2 actuator with open/closed valve door, solenoid valve described here or piezoelectricity
Actuator can regulate fuel pressure in the control room being set directly at above needle-like piece 2 and beat ON/OFF with control needle-like piece 2
Closed operation.
In the present embodiment, use DI diesel engine as direct injection type electromotor.Or, it is also possible to
Use toroidal swirl type petrol engine as direct injection type electromotor.In the present embodiment, the centre bit of spray orifice entrance 31
Boundary between inner peripheral surface and the bottom wall surface of bag-shaped room 8.Or, the center of spray orifice entrance 31 can be only located at bag-shaped room
On the perpendicular wall surfaces of 8.Additionally, the center of spray orifice entrance 31 can also be only located in the bottom wall surface of bag-shaped room 8.Whole needle-like piece
Front end geometry can be spheric, conical butt or cone.The embodiment that the disclosure is not limited to the described above, can be by
It is practiced in various variants.
In a word, the fuel injection nozzle 1 according to above-described embodiment can be described below.
In the one side of the disclosure, when needle-like piece lift amount is less than threshold value, L, L0 and φ Dy meets │ L-L0 │ ＞ φ
The relation of Dy/2.Therefore, when needle-like piece lift amount is less than threshold value, it is prone to produce in by the fuel stream within each spray orifice
Turbulent flow, the injected fuel spray penetration power being ejected in combustor by spray orifice is died down.On the other hand, when needle-like piece lift amount is more than threshold
During value, L, L0 and φ Dy meets the relation of │ L-L0 │≤φ Dy/2.Therefore, when the lift amount of needle-like piece is more than threshold value, logical
Crossing in the fuel stream within each spray orifice and be not likely to produce turbulent flow, the spraying penetration power being ejected in combustor by spray orifice is strengthened.
Therefore, when the lift amount of needle-like piece is more than threshold value, spraying penetration power can strengthen.When the lift amount of needle-like piece is less than threshold value
Spraying penetration power can weaken.Its details describes in detail referring to the drawings in the above-described embodiments.
Although describing the disclosure already in connection with embodiment, but it is to be understood that the disclosure be not limited to described embodiment and
Structure.The disclosure is intended to cover various modification and equivalent arrangements.Although additionally, had various combination and structure, but comprising
More, less or other combination of discrete component and structure are also in the spirit and scope of the disclosure.
Claims (4)
1. the fuel injection nozzle (1) for electromotor, including:
Nozzle body (3), it has cylindrical form and has:
Multiple spray orifices (7), fuel is ejected in the combustor of described electromotor by the plurality of spray orifice；
The fuel channel (13) being formed on the upstream side of the plurality of spray orifice (7)；
Limit the seat surface (10) of the cone of described fuel channel (13)；With
The bag-shaped room (8) being arranged on the downstream of described fuel channel (13), wherein said multiple spray orifices (7) circumferentially cloth
Put, and include the entrance (31) being positioned on the inner peripheral surface of described bag-shaped room (8) respectively；And
It is contained in described nozzle body (3) needle-like piece (2) can move along the axial reciprocating of described nozzle body (3), its bag
Include:
Annular seats (5), itself and described seat surface (10) are out of engagement with to close or to open described fuel channel (13)；With
The end extension (6) of cone, it is positioned on the downstream of described seat portion (5), and works as described seat portion (5) with described
Seat surface (10) is positioned in described bag-shaped room (8), wherein when engaging:
Known:
φ Dy is injection diameter (φ D) axial component vertically of each spray orifice in the plurality of spray orifice (7)；
L0 is from the described entrance (31) of the plurality of spray orifice (7) when described needle-like piece (2) closes described fuel channel (13)
In the center of each entrance to the axial distance of one end (17) of whole described needle-like piece (2)；And
L is the lift amount of described needle-like piece (2),
When the lift amount (L) of described needle-like piece (2) is less than the threshold value preset, meet the relation of │ L-L0 │ ＞ φ Dy/2；And
When the lift amount (L) of described needle-like piece (2) is more than described threshold value, meet the relation of │ L-L0 │≤φ Dy/2.
Fuel injection nozzle the most according to claim 1 (1), wherein:
When the lift amount (L) of described needle-like piece (2) is less than described threshold value, it is outwardly formed at described seat surface from described seat portion (5)
(10) the seat aisle spare (α) and between described seat portion (5) is set to be less than spray orifice overall channel area (β), and described spray orifice is total
Aisle spare is the summation of the aisle spare of the plurality of spray orifice (7)；And
When the lift amount (L) of described needle-like piece (2) is more than described threshold value, described seat aisle spare (α) is set to be greater than institute
State spray orifice overall channel area (β).
Fuel injection nozzle the most according to claim 1 and 2 (1) is wherein little when the lift amount (L) of described needle-like piece (2)
When described threshold value, it is outwardly formed the seat aisle spare between described seat surface (10) and described seat portion (5) from described seat portion (5)
(α) the smallest passage area (MA) in the fuel channel formed in described nozzle body (3) it is set to.
Fuel injection nozzle the most according to claim 1 and 2 (1) is wherein big when the lift amount (L) of described needle-like piece (2)
When described threshold value, spray orifice overall channel area (β) as the summation of the aisle spare of the plurality of spray orifice (7) is set to
Smallest passage area (MA) in the fuel channel formed in described nozzle body (3).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015126661A JP2017008859A (en) | 2015-06-24 | 2015-06-24 | Fuel injection nozzle |
| JP2015-126661 | 2015-06-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106286056A true CN106286056A (en) | 2017-01-04 |
| CN106286056B CN106286056B (en) | 2019-06-18 |
Family
ID=57537540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610470844.1A Expired - Fee Related CN106286056B (en) | 2015-06-24 | 2016-06-24 | Fuel injection nozzle |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2017008859A (en) |
| CN (1) | CN106286056B (en) |
| DE (1) | DE102016109763A1 (en) |
| FR (1) | FR3038010B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106996349A (en) * | 2017-04-19 | 2017-08-01 | 四川森洁燃气设备有限公司 | A kind of combustion gas adjustable type spout structure |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2019116816A1 (en) * | 2017-12-12 | 2020-11-19 | 日立オートモティブシステムズ株式会社 | Fuel injection valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11264365A (en) * | 1998-03-19 | 1999-09-28 | Denso Corp | Fuel injection valve |
| US6959878B1 (en) * | 1999-11-17 | 2005-11-01 | Stanadyne Corporation | Compact fuel injection nozzle |
| CN103261662A (en) * | 2010-12-20 | 2013-08-21 | 丰田自动车株式会社 | Fuel injection valve |
| JP2013185455A (en) * | 2012-03-06 | 2013-09-19 | Mazda Motor Corp | Fuel injection valve, and internal combustion engine comprising the same |
| CN104704230A (en) * | 2012-10-12 | 2015-06-10 | 丰田自动车株式会社 | Fuel injection valve |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59110378U (en) * | 1983-01-17 | 1984-07-25 | 日産自動車株式会社 | fuel injection nozzle |
| JP3033431B2 (en) * | 1994-03-30 | 2000-04-17 | 三菱自動車工業株式会社 | Fuel injection nozzle |
| DE19820513A1 (en) * | 1998-05-08 | 1999-11-11 | Mtu Friedrichshafen Gmbh | Fuel injection nozzle for internal combustion engine |
| JP2010174819A (en) | 2009-01-30 | 2010-08-12 | Denso Corp | Fuel injection valve |
| JP2010180763A (en) * | 2009-02-04 | 2010-08-19 | Nippon Soken Inc | Fuel injection nozzle |
| JP2013019386A (en) * | 2011-07-13 | 2013-01-31 | Toyota Central R&D Labs Inc | Fuel injection valve |
| JP2014020339A (en) * | 2012-07-23 | 2014-02-03 | Okayama Univ | Fuel injection nozzle |
-
2015
- 2015-06-24 JP JP2015126661A patent/JP2017008859A/en active Pending
-
2016
- 2016-05-27 DE DE102016109763.2A patent/DE102016109763A1/en not_active Withdrawn
- 2016-06-23 FR FR1655859A patent/FR3038010B1/en not_active Expired - Fee Related
- 2016-06-24 CN CN201610470844.1A patent/CN106286056B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11264365A (en) * | 1998-03-19 | 1999-09-28 | Denso Corp | Fuel injection valve |
| US6959878B1 (en) * | 1999-11-17 | 2005-11-01 | Stanadyne Corporation | Compact fuel injection nozzle |
| CN103261662A (en) * | 2010-12-20 | 2013-08-21 | 丰田自动车株式会社 | Fuel injection valve |
| JP2013185455A (en) * | 2012-03-06 | 2013-09-19 | Mazda Motor Corp | Fuel injection valve, and internal combustion engine comprising the same |
| CN104704230A (en) * | 2012-10-12 | 2015-06-10 | 丰田自动车株式会社 | Fuel injection valve |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106996349A (en) * | 2017-04-19 | 2017-08-01 | 四川森洁燃气设备有限公司 | A kind of combustion gas adjustable type spout structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106286056B (en) | 2019-06-18 |
| JP2017008859A (en) | 2017-01-12 |
| FR3038010B1 (en) | 2020-02-07 |
| DE102016109763A1 (en) | 2016-12-29 |
| FR3038010A1 (en) | 2016-12-30 |
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