CN109779804A - A kind of opening and closing control valve core of high pressure common rail injector - Google Patents
A kind of opening and closing control valve core of high pressure common rail injector Download PDFInfo
- Publication number
- CN109779804A CN109779804A CN201910181520.XA CN201910181520A CN109779804A CN 109779804 A CN109779804 A CN 109779804A CN 201910181520 A CN201910181520 A CN 201910181520A CN 109779804 A CN109779804 A CN 109779804A
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- Prior art keywords
- oil
- fuel feed
- feed hole
- injection
- oil outlet
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- 239000000446 fuel Substances 0.000 claims abstract description 89
- 238000002347 injection Methods 0.000 claims abstract description 56
- 239000007924 injection Substances 0.000 claims abstract description 56
- 239000007921 spray Substances 0.000 claims abstract description 12
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 104
- 230000008878 coupling Effects 0.000 description 14
- 238000010168 coupling process Methods 0.000 description 14
- 238000005859 coupling reaction Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 9
- 230000007423 decrease Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- Fuel-Injection Apparatus (AREA)
Abstract
A kind of opening and closing control valve core of high pressure common rail injector, including closing fuel feed hole, closing oil outlet, lower lateral oil-feed tank, injection fuel feed hole and injection oil outlet, it closes fuel feed hole and is communicated with closing oil outlet by lower lateral oil-feed tank, injection fuel feed hole and injection oil outlet are communicated by upper lateral oil-feed tank, and the minimum-value aperture of closing oil outlet and injection oil outlet is less than the aperture of vertical oil outlet；It closes fuel feed hole and sprays fuel feed hole and communicated with axial fuel inlet slot on the outer circle side wall that oil inlet guiding valve pocket is arranged in；Shorter when it can make the response on and off of needle, oil spout and oil-break are more thorough, improve the power density of fuel injector, can be further improved diesel engine power output, reduce the discharge of diesel engine, be the key part of energy conservation and environmental protection diesel engine.
Description
Technical field:
The invention patent relates to use for diesel engine Common rail injector more particularly to high-pressure co-rail fuel injectors.
Background technique:
Prior art injector assembly structure is as shown in Figure 1 and Figure 2, it includes valve body 1, oil injection coupling 2, locking cap 3, valve
Bar 4, ball sealer 5, the present invention 6 and electromagnetic valve components 7, electromagnetic valve components 7 include electromagnetic coil 71, armature seat 72, armature lever 73
With spring 74, oil injection coupling 2 is made of needle-valve 21 and needle-valve body 22, on valve body 1 be equipped with centre bore 11, high pressure fuel feed hole 12,
Upper outer oil duct 13, lower outer oil duct 14, valve rod 4 are mounted in the centre bore of valve body 1 with gap fiting mode, the lower guiding of valve rod 4
Section is pressed on needle-valve 21 by oil nozzle spring and lower guide sleeve, and needle-valve 21 is sleeved in the centre bore of needle-valve body 22, oil injection coupling 2
The lower end of valve body 1 is axially fixed to by locking cap 3, fuel-economizing body 6 is sleeved on the upper end of valve rod 4, and ball sealer 5 is arranged in the present invention
Between 6 and armature lever 73, electromagnetic coil 71 controls the flexible of armature lever 73, its working principles are as follows:
High pressure fuel is entered by high pressure oil inlet 12 in the upper outer oil duct 13 and lower outer oil duct 14 of valve body 1, high pressure fuel
Entered all the way from the side fuel feed hole 61 in the present invention 6 by being formed between the present invention 6 and 4 top of valve rod by upper outer oil duct 13
In upper control chamber 8, high pressure fuel another way, with the lower control chamber 9 in oil injection coupling 2, works as electromagnetic coil by lower outer oil duct 14
When 71 power loss, due to the effect of 74 pretightning force of spring, ball sealer 5 is sealed on the taper seat surface of the present invention 6, is not considering to save
In the case where stream loss, upper control chamber 8 with the oil liquid pressure in lower control chamber 9 be it is identical, since the diameter of valve rod 4 is greater than needle
The diameter of valve 21, therefore, upper control chamber 8 are greater than lower control chamber 9 by the downward hydraulic coupling F1 that valve rod 4 is applied to needle-valve 21 and apply
The upward hydraulic coupling F2 of needle-valve 21 is added to, i.e. F1 > F2, needle-valve 21 is sealed on the taper seat surface of needle-valve body 22 at this time, spray
Oily couple 2 is in close state, not oil spout；
When electromagnetic coil 71 it is electric when, electromagnetic coil 71 generates electromagnetic attraction to armature lever 73, when big due to electromagnetic force
When the small pretightning force for overcoming spring 74,73 uplink of armature lever is driven, ball sealer 5 leaves the taper seat surface of the present invention 6, upper control chamber
8 are communicated by end face oil outlet 62 with low pressure chamber, since the flow velocity of the velocity ratio side fuel feed hole 61 of end face oil outlet 62 is big, because
This, the pressure of upper control chamber 8 gradually decreases, and F1 also reduces therewith, when the resultant force that needle-valve 21 is subject to is upward, forces on needle-valve 21
Row, oil injection coupling 2 is in the open state, and fuel injector realizes the injection of pressure oil；
Existing high pressure common rail injector cannot be realized simultaneously reduces opening time and shut-in time.Existing high-pressure common rail
The power density of fuel injector is small, is not able to satisfy the mating requirement of energy-efficient diesel engine, therefore, it is necessary to spray to existing high-pressure common rail
Oily device improves design.Applicants have invented a kind of high pressure common rail injectors, wherein and opening and closing control valve is critical component, and
Opening and closing control valve core is the most key part.
Summary of the invention:
The object of the present invention is to provide a kind of opening and closing control valve cores of high pressure common rail injector, it can reduce common rail spray simultaneously
The delay time of opening and closing in oily device course of injection improves fuel injector to reduce the injection duration of fuel injector
Power density.
The technical solution adopted by the present invention is that:
A kind of opening and closing control valve core of high pressure common rail injector, it is characterized in that: include close fuel feed hole, close oil outlet,
Lower transverse direction oil-feed tank, injection fuel feed hole and injection oil outlet, wherein close fuel feed hole with oil outlet is closed and pass through lower lateral oil inlet
Slot communicates, and injection fuel feed hole and injection oil outlet are communicated by upper lateral oil-feed tank, closes oil outlet and injection oil outlet most
Small-bore is less than the aperture of vertical oil outlet, closes fuel feed hole and sprays fuel feed hole and the outer circle side that oil inlet guiding valve pocket is arranged in
The axial fuel inlet slot that wall is equipped with communicates.
Further, the oil inlet circle is arranged on the lower end surface of spool, closes fuel feed hole and sprays fuel feed hole and oil inlet
Circle communicates.
Further, it closes fuel feed hole and injection fuel feed hole is on same circumference.
Further, the closing fuel feed hole and injection fuel feed hole are stepped hole, down big up small, close oil outlet and injection
Oil outlet is also stepped hole, up big and down small.
Since the present invention has abandoned the control principle of existing fuel injector opening and closing control valve, by monoblock type opening and closing control valve design
At seperated composite structure, it includes valve seat, spool and oil inlet guiding valve pocket, and valve seat, spool and oil inlet guiding valve pocket are from top to bottom
It is sequentially coaxially distributed, conical seat face and vertical oil outlet is equipped on the upper surface of valve seat, vertical oil outlet is arranged in taper
The center in seat surface hole, is equipped with upper lateral oil-feed tank on lower end surface, and vertical oil outlet is communicated with upper lateral oil-feed tank；On spool
Equipped with closing fuel feed hole, close oil outlet, lower lateral oil-feed tank, injection fuel feed hole and injection oil outlet, wherein closing fuel feed hole
It being communicated with oil outlet is closed by lower lateral oil-feed tank, injection fuel feed hole and injection oil outlet are communicated by upper lateral oil-feed tank,
It closes oil outlet and sprays aperture of the minimum-value aperture less than vertical oil outlet of oil outlet；In the outer circle side wall of oil inlet guiding valve pocket
It is equipped with axial fuel inlet slot, axial fuel inlet slot is communicated by oil inlet circle with closing fuel feed hole and injection fuel feed hole；
Due to vertical oilhole flow-rate ratio injection fuel feed hole it is big, the pressure of upper control chamber can reduce rapidly, thus on
Oil pressure is transmitted to the hydraulic coupling on needle-valve by valve rod and can decline rapidly in control chamber, thus can reduce unlatching delay；Work as electromagnetism
When valve no power, ball sealer is sealed on the seat surface of valve seat, and high pressure oil a-road-through crosses closing fuel feed hole, lower lateral oil-feed tank at this time
Enter in upper control chamber with oil outlet is closed, another way is entered by injection fuel feed hole, upper lateral oil-feed tank and injection oil outlet
In upper control chamber, two road high pressure oils enter upper control chamber simultaneously, and the pressure in upper control chamber rises rapidly, and thus upper control chamber is logical
Crossing the hydraulic coupling that valve rod is transmitted on needle-valve can rise rapidly, and thus can reduce closing delay.It is realized as a result, by this invention
To reducing unlatching delay in course of injection simultaneously and closing delay, the injection duration is reduced to realize, realizes and improves power density
Purpose.Such structure is shorter when making the response on and off of needle-valve, and oil spout and oil-break are thorough, improve fuel injector
Power density, can be further improved diesel engine power output, reduce the discharge of diesel engine, reduce the unit power of diesel engine
Weight is the critical component of energy conservation and environmental protection diesel engine.
Detailed description of the invention:
Fig. 1 is the structural schematic diagram of existing fuel injector；
Fig. 2 is the structural schematic diagram of fuel-economizing body in Fig. 1；
Fig. 3 is the structural schematic diagram using fuel injector of the invention；
Fig. 4 is mounting structure schematic diagram of the present invention in valve body；
Fig. 5 is the structural schematic diagram of valve seat；
Fig. 6 is the structural schematic diagram of spool；
Fig. 7 is the structural schematic diagram that oil inlet is oriented to valve pocket；
Fig. 8 is the structural schematic diagram of valve body；
Fig. 9 is the structural schematic diagram of stem member；
In figure: 1- valve body；2- oil injection coupling；3- locking cap；4- valve rod；5- ball sealer；The 6- present invention；7- electromagnetism valve portion
Part；The upper control chamber of 8-；Control chamber under 9-；11- centre bore；12- high pressure fuel feed hole；The upper outer oil duct of 13-；Outer oil duct under 14-；15-
Lateral oil-feed tank；The upper hole system of 111-；112- spool bore；Pilot hole on 113- valve rod；Pilot hole under 114- valve rod；21- needle-valve；
22- needle-valve body；23- needle-valve fuel feed hole；The upper guide section of 41-；42- upper reset spring；43- axis circlip；44- changeover portion；Under 45-
Reset spring；Guide section under 46-；Guide sleeve under 47-；The side 61- fuel feed hole；The end face 62- oil outlet；63- valve seat；64- spool；
65- oil inlet is oriented to valve pocket；631- conical seat face；The vertical oil outlet of 632-；The upper lateral oil-feed tank of 633-；641- closes oil inlet
Hole；642- closes oil outlet；Lateral oil-feed tank under 643-；644- sprays fuel feed hole；645- sprays oil outlet；646- oil inlet circle；
651- axial fuel inlet slot；71- magnetic coil, 72- armature seat, 73- armature lever；74- spring.
Specific embodiment:
The embodiment that the present invention will now be explained with reference to the accompanying drawings in the high pressure common rail injector of high power density:
Embodiment 1:
A kind of high pressure common rail injector of high power density, as shown in Fig. 3-Fig. 9, including valve body 1, oil injection coupling 2, locking
Cap 3, valve rod 4, ball sealer 5, the present invention 6 and electromagnetic valve components 7, the present invention 6 include that valve seat 63, spool 64 and oil inlet are oriented to valve pocket
65, valve seat 63, spool 64 and oil inlet guiding valve pocket 65 are sequentially coaxially distributed from top to bottom, and cone is equipped on the upper surface of valve seat 63
Shape seat surface hole 631 and vertical oil outlet 632, the center of conical seat face 631 is arranged in vertical oil outlet 632, on lower end surface
Equipped with upper lateral oil-feed tank 633, vertical oil outlet 632 is communicated with upper lateral oil-feed tank 633；It is equipped on spool 64 and closes oil inlet
Oil outlet 642, lower lateral oil-feed tank 643, injection fuel feed hole 644 and injection oil outlet 645 are closed in hole 641, wherein close into
Oilhole 641 is communicated with closing oil outlet 642 by lower lateral oil-feed tank 643, and injection fuel feed hole 644 and injection oil outlet 645 lead to
It crosses lateral oil-feed tank 633 to communicate, close oil outlet 642 and sprays the minimum-value aperture of oil outlet 645 less than vertical oil outlet 632
Aperture；It closes fuel feed hole 641 and injection fuel feed hole 644 is on same circumference, oil inlet is equipped on the lower end surface of spool 64
Circle 646, closes fuel feed hole 641 and injection fuel feed hole 644 is communicated with oil inlet circle 646, the closing fuel feed hole 641 be injected into
Oilhole 644 is stepped hole, down big up small, and closing oil outlet 642 and injection oil outlet 645 is also stepped hole, up big and down small；?
The outer circle side wall that oil inlet is oriented to valve pocket 65 is equipped with axial fuel inlet slot 651, and axial fuel inlet slot 651 is by oil inlet circle and closes oil inlet
Hole 641 and injection fuel feed hole 644 communicate；Centre bore 11, high pressure fuel feed hole 12 and lateral oil-feed tank 15, institute are equipped on valve body 1
It states high pressure fuel feed hole 12 to communicate with centre bore 11, the centre bore 11 is stepped bore system, including upper hole system 111, spool bore
112, pilot hole 114, upper hole system 111 are the mounting hole of electromagnetic valve components 7 under pilot hole 113 and valve rod on valve rod, laterally into
Oil groove 15 is arranged on the lower end surface of valve body 1, and communicates with pilot hole 114 under valve rod, is sequentially arranged with spool in spool bore 112
64 and valve seat 63, spool 64 is located at the lower section of valve seat 63, and the valve rod 4 successively includes upper guide section 41, upper reset from top to bottom
Spring 42, axis circlip 43, changeover portion 44, lower reset spring 45, lower guide section 46 and lower guide sleeve 47,42 sets of upper reset spring
On the upper guide section 41 of valve rod 4 and by axis 43 axial limiting of circlip, the inner hole sleeve of oil inlet guiding valve pocket 65, which is mounted in, is above led
It is therebetween accurate clearance fit in section 41, oil inlet guiding valve pocket 65 is fixedly mounted on valve rod in pilot hole 113,
The upper surface of oil inlet guiding valve pocket 65 is docked with the sealing of the lower end surface of spool 64, and lower reset spring 45 is sleeved on lower guide section 46
On, lower guide section 46 is sleeved under valve rod in pilot hole 114, the lower end surface of lower guide section 46 and the upper end face contact of needle-valve 21,
Needle-valve 21 is sleeved in the centre bore of needle-valve body 22, and oil injection coupling 2 is axially fixed to the lower end of valve body 1, needle-valve by locking cap 3
The upper end of needle-valve fuel feed hole 23 on body 22 is communicated with lateral oil-feed tank 15, the lower end of needle-valve fuel feed hole 23 and lower 9 phase of control chamber
It is logical.
Specific working principle are as follows: high pressure fuel high pressure fuel feed hole 12 tilting from valve body 1 enters, and is directly entered later
On valve rod under pilot hole 113 and valve rod in pilot hole 114, the high pressure oil on valve rod in pilot hole 113 is oriented to valve pocket 65 from oil inlet
The axial fuel inlet slot 651 that is equipped with of outer circle side wall enter upper control chamber 8 by closing fuel feed hole 641 and injection fuel feed hole 644
In；And the high pressure oil under valve rod in pilot hole 114 then enters in lower control chamber 9 from lateral oil-feed tank 15, needle-valve fuel feed hole 23；When
When 7 no power of electromagnetic valve components, since the pretightning force of electromagnet spring acts on, armature lever is sealed in ball sealer 5 by ball seat
On vertical oil outlet 632 in the conical seat face 631 of valve seat 63, vertical oil outlet 632 is blocked by ball sealer 5, high pressure oil one
Road is entered in upper control chamber 8 by closing fuel feed hole 641, lower lateral oil-feed tank 643 and closing oil outlet 642, and another way passes through
It sprays fuel feed hole 644, upper lateral oil-feed tank 633 and injection oil outlet 645 to enter in upper control chamber 8, due to leading on upper valve rod
It is greater than the diameter of lower guide section 46 to the diameter of section 41, resultant force suffered by valve rod 4 is downward at this time, is in oil injection coupling 2 and closes
Closed state, fuel injector not oil spout；
When electromagnetic valve components 7 are powered, armature lever overcomes the pretightning force of spring to move up, and ball sealer 5 is in decompression state, this
When, high pressure oil in upper control chamber 8 is from injection oil outlet 645, upper lateral oil-feed tank 633, vertical oil outlet 632 and cone
631 pressure release of shape seat surface hole, since the pressure in lower control chamber 9 is higher than the pressure of upper control chamber 8, needle-valve 21 is moved up with ovable valve stem 4,
Oil injection coupling 2 is set to be in oil spout state, fuel injector oil spout.
There are many embodiments of the present invention, do not enumerate one by one herein, as long as the butt for taking the functions such as the present invention to replace
Case belongs to protection scope of the present invention.
Claims (4)
1. the opening and closing control valve core of a kind of high pressure common rail injector, it is characterized in that: fuel-displaced including closing fuel feed hole (641), closing
Hole (642), lower lateral oil-feed tank (643), injection fuel feed hole (644) and injection oil outlet (645), wherein close fuel feed hole
(641) it is communicated with closing oil outlet (642) by lower lateral oil-feed tank (643), sprays fuel feed hole (644) and injection oil outlet
(645) it is communicated by upper lateral oil-feed tank (633), the minimum-value aperture for closing oil outlet (642) and injection oil outlet (645) is less than
The aperture of vertical oil outlet (632) closes fuel feed hole (641) and injection fuel feed hole (644) and setting in oil inlet and is oriented to valve pocket
(65) the axial fuel inlet slot (651) that outer circle side wall is equipped with communicates.
2. the opening and closing control valve core of high pressure common rail injector according to claim 1, it is characterized in that: the oil inlet circle (646)
It is arranged on the lower end surface of spool (64), closes fuel feed hole (641) and injection fuel feed hole (644) is communicated with oil inlet circle (646).
3. the opening and closing control valve core of high pressure common rail injector according to claim 1, it is characterized in that: closing fuel feed hole (641)
It is on same circumference with injection fuel feed hole (644).
4. the opening and closing control valve core of high pressure common rail injector according to claim 1, it is characterized in that: the closing fuel feed hole
(641) and injection fuel feed hole (644) is stepped hole, down big up small, closes oil outlet (642) and injection oil outlet (645)
It is up big and down small for stepped hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910181520.XA CN109779804A (en) | 2019-03-11 | 2019-03-11 | A kind of opening and closing control valve core of high pressure common rail injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910181520.XA CN109779804A (en) | 2019-03-11 | 2019-03-11 | A kind of opening and closing control valve core of high pressure common rail injector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109779804A true CN109779804A (en) | 2019-05-21 |
Family
ID=66488068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910181520.XA Withdrawn CN109779804A (en) | 2019-03-11 | 2019-03-11 | A kind of opening and closing control valve core of high pressure common rail injector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109779804A (en) |
-
2019
- 2019-03-11 CN CN201910181520.XA patent/CN109779804A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20190521 |