CN209604181U - A kind of high power density high pressure common rail injector - Google Patents
A kind of high power density high pressure common rail injector Download PDFInfo
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- CN209604181U CN209604181U CN201920306421.5U CN201920306421U CN209604181U CN 209604181 U CN209604181 U CN 209604181U CN 201920306421 U CN201920306421 U CN 201920306421U CN 209604181 U CN209604181 U CN 209604181U
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Abstract
A kind of high power density high pressure common rail injector, including valve body and throttling body, the body that throttles includes valve seat, spool and oil inlet are oriented to valve pocket, upper in valve seat is equipped with conical seat face, vertical oil outlet and upper lateral oil-feed tank, it is equipped on spool and closes fuel feed hole, close oil outlet, lower transverse direction oil-feed tank, spray 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, it closes oil outlet and sprays aperture of the minimum-value aperture less than vertical oil outlet of oil outlet；Axial fuel inlet slot is equipped on the outer circle side wall of oil inlet guiding valve pocket, axial fuel inlet slot is communicated by oil inlet circle with closing fuel feed hole and injection fuel feed hole；It can make the response time on and off of needle-valve shorter, and 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 critical component of energy conservation and environmental protection diesel engine.
Description
Technical field:
The utility model patent is related to use for diesel engine electric-control common-rail type fuel injector.
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, throttling body 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 the setting of ball sealer 5 is in throttling body
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 on throttling body 6 by being formed between 4 top of throttling body 6 and 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 throttling body 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 throttling body 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；
If the flow velocity for defining end face oil outlet 62 is K1, the flow velocity of side fuel feed hole 61 is K2, and setting oil pressure is constant, valve rod
4 and needle-valve 21 diameter dimension it is constant, then the opening time and shut-in time of injector assembly by throttling body 6 end face oil outlet
62 and side fuel feed hole 61 flow-rate ratio K1/K2 determine, when K1/K2 is bigger, the opening time is shorter, and the shut-in time is longer, and
K1/K2 is smaller, then the opening time is longer, and the shut-in time is shorter.Existing high pressure common rail injector cannot realize that simultaneously reduction is opened
Open time and shut-in time.The power density of existing high pressure common rail injector is small, is not able to satisfy matching for energy-efficient diesel engine
Set requires, therefore, it is necessary to improve design to existing high pressure common rail injector.
Utility model content:
The purpose of the utility model is to provide a kind of high power density high pressure common rail injectors, it is sprayed in common-rail injector
The time opened delay and close delay can be reduced simultaneously in the process, to realize the effect for reducing the injection duration, reach and mention
The purpose of high power density.
The technical scheme adopted by the utility model is that:
A kind of high power density high pressure common rail injector, including valve body, oil injection coupling, locking cap, valve rod, ball sealer, section
Fluid and electromagnetic valve components, the throttling body include valve seat, spool and oil inlet guiding valve pocket, valve seat, spool and oil inlet guide valve
Set is sequentially coaxially distributed from top to bottom, and conical seat face and vertical oil outlet, vertical oil outlet are equipped on the upper surface of valve seat
The center of conical seat face is set, upper lateral oil-feed tank, vertical oil outlet and upper lateral oil-feed tank phase are equipped on lower end surface
It is logical；It is equipped on spool and closes fuel feed hole, closes oil outlet, lower lateral oil-feed tank, injection fuel feed hole and injection oil outlet,
In, 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 pass through upper cross
It is communicated to oil-feed tank, close oil outlet and sprays aperture of the minimum-value aperture less than vertical oil outlet of oil outlet；
Oil inlet guiding valve pocket outer circle side wall on be equipped with axial fuel inlet slot, axial fuel inlet slot by oil inlet circle and close into
Oilhole and injection fuel feed hole communicate；
Centre bore, high pressure fuel feed hole and lateral oil-feed tank, the high pressure fuel feed hole is equipped on valve body to communicate with centre bore,
The centre bore is stepped bore system, including upper hole system, spool bore, pilot hole, upper hole under pilot hole and valve rod on valve rod
System is the mounting hole of electromagnetic valve components, and lateral oil-feed tank is arranged on the lower end surface of valve body, and communicates with pilot hole under valve rod, In
Spool and valve seat are sequentially arranged in spool bore, spool is located at the lower section of valve seat, and the valve rod successively includes upper guiding from top to bottom
Section, upper reset spring, axis circlip, changeover portion, lower reset spring, lower guide section and lower guide sleeve, upper reset spring are sleeved on
On the upper guide section of valve rod and by axis circlip axial limiting, oil inlet is oriented to the inner hole sleeve of valve pocket on upper guide section, the two
Between be accurate clearance fit, oil inlet guiding valve pocket is fixedly mounted on valve rod in pilot hole, and oil inlet is oriented to the upper end of valve pocket
Face is docked with the sealing of the lower end surface of spool, and lower reset spring is sleeved on lower guide section, and lower guide section is sleeved under valve rod and is oriented to
Kong Zhong, the lower end surface of lower guide section and the upper end face contact of needle-valve, needle-valve are sleeved in the centre bore of needle-valve body, oil injection coupling by
Locking cap is axially fixed to the lower end of valve body, and the upper end of the needle-valve fuel feed hole on needle-valve body is communicated with lateral oil-feed tank, needle-valve
The lower end of fuel feed hole is communicated with lower control chamber；
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.
Specific working principle are as follows: high pressure fuel high pressure fuel feed hole tilting from valve body enters, later direct admission valve
On bar under pilot hole and valve rod in pilot hole, the high pressure oil on valve rod in pilot hole is set from the outer circle side wall of oil inlet guiding valve pocket
Some axial fuel inlet slots are entered in upper control chamber by closing fuel feed hole and injection fuel feed hole；And the high pressure under valve rod in pilot hole
It is oily then from lateral oil-feed tank, needle-valve fuel feed hole enter lower control chamber in；When electromagnetic valve components no power, due to electromagnet spring
Pretightning force effect, armature lever is sealed in ball sealer on the vertical oil outlet in the conical seat face of valve seat by ball seat, perpendicular
Straight oil outlet is blocked by ball sealer, high pressure oil a-road-through cross closing fuel feed hole, lower lateral oil-feed tank and close oil outlet enter it is upper
In control chamber, another way is entered in upper control chamber by injection fuel feed hole, upper lateral oil-feed tank and injection oil outlet, due to upper valve
The diameter of the upper guide section of bar is greater than the diameter of lower guide section, and resultant force suffered by valve rod is downward at this time, is in oil injection coupling
Closed state, fuel injector not oil spout；
When electromagnetic valve components are powered, armature lever overcomes the pretightning force of spring to move up, and ball sealer is in decompression state, this
When, high pressure oil in upper control chamber is from injection oil outlet, upper lateral oil-feed tank, vertical oil outlet and conical seat face are let out
Pressure, since the pressure in lower control chamber is higher than the pressure of upper control chamber, needle-valve band ovable valve stem is moved up, and oil injection coupling is made to be in oil spout
State, fuel injector oil spout.
Since the utility model has abandoned the control principle of existing fuel injector, by monoblock type section fluid design Split assembled knot
Structure, the throttling body include that valve seat, spool and oil inlet guiding valve pocket, valve seat, spool and oil inlet are oriented to valve pocket from top to bottom successively
Coaxial distribution, is equipped with conical seat face and vertical oil outlet on the upper surface of valve seat, and vertical oil outlet is arranged in taper seat surface
The center in 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；It is equipped on spool
It closes fuel feed hole, close oil outlet, lower lateral oil-feed tank, injection fuel feed hole and injection oil outlet, wherein close fuel feed hole and close
It closes oil outlet to communicate by lower lateral oil-feed tank, injection fuel feed hole and injection oil outlet are communicated by upper lateral oil-feed tank, are closed
The minimum-value aperture of oil outlet and injection oil outlet is less than the aperture of vertical oil outlet；It is set on the outer circle side wall of oil inlet guiding valve pocket
There is axial fuel inlet slot, axial fuel inlet slot is communicated by oil inlet circle with closing fuel feed hole and injection fuel feed hole；
Since the flow-rate ratio injection fuel feed hole of vertical oil outlet is big, the pressure of upper control chamber can be reduced rapidly, thus
Oil pressure is transmitted to the hydraulic coupling on needle-valve by stem member and can decline rapidly in upper control chamber, thus can reduce unlatching delay；
When electromagnetic valve components no power, ball sealer is sealed on the seat surface of valve seat, at this time high pressure oil a-road-through cross closing fuel feed hole, under
Lateral oil-feed tank and closing oil outlet enter in upper control chamber, and another way passes through injection fuel feed hole, upper lateral oil-feed tank and injection
Oil outlet enters in upper control chamber, and two road high pressure oils enter upper control chamber simultaneously, and the pressure in upper control chamber rises rapidly, thus
Upper control chamber is transmitted to the hydraulic coupling on needle-valve by stem member and can rise rapidly, and thus can reduce closing delay.Lead to as a result,
It crosses this utility model to realize in course of injection while reducing unlatching delay and closing and postpone, to realize that reduce injection lasting
Phase realizes the purpose for improving power density.Such structure is shorter when making the response on and off of needle-valve, oil spout and disconnected
It is oily thoroughly to improve the power density of fuel injector, it can be further improved diesel engine power output, reduce the discharge of diesel engine, drop
The weight of the unit power of low diesel engine is the critical component of energy conservation and environmental protection diesel engine.
The utility model can reduce duration when fuel oil injection, achieve the purpose that improve power density, to realize
Three within identical time duration the utility model has the advantages that first is that can be improved the power of diesel engine；Second is that fuel system liquid can be realized
The lightweight of power component, this is beneficial to the installation of fuel system；Third is that being conducive to due to the lightweight of fuel system hydrodynamic component
Improve the mobility and lifting capacity for loading diesel-engine road vehicle.
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 of the utility model；
Fig. 4 is mounting structure schematic diagram of the body in valve body that throttle；
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；6- throttling body；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- electromagnetic coil；72- armature seat；73- armature lever；74- spring.
Specific embodiment:
Specific embodiment of the present utility model is illustrated with reference to the accompanying drawing:
Embodiment 1:
A kind of high power density high pressure common rail injector, as shown in Fig. 3-Fig. 9, including valve body 1, oil injection coupling 2, locking cap
3, valve rod 4, ball sealer 5, throttling body 6 and electromagnetic valve components 7, the throttling body 6 include valve seat 63, spool 64 and oil inlet guide valve
Set 65, valve seat 63, spool 64 and oil inlet guiding valve pocket 65 are sequentially coaxially distributed from top to bottom, are equipped on the upper surface of valve seat 63
Conical seat face 631 and vertical oil outlet 632, the center of conical seat face 631 is arranged in vertical oil outlet 632, in lower end surface
It is equipped with upper lateral oil-feed tank 633, vertical oil outlet 632 is communicated with upper lateral oil-feed tank 633；On spool 64 be equipped with close into
Oilhole 641 closes oil outlet 642, lower lateral oil-feed tank 643, injection fuel feed hole 644 and injection oil outlet 645, wherein closes
Fuel feed hole 641 is communicated with closing oil outlet 642 by lower lateral oil-feed tank 643, injection fuel feed hole 644 and injection oil outlet 645
It is communicated by upper lateral oil-feed tank 633, close oil outlet 642 and sprays the minimum-value aperture of oil outlet 645 less than vertical oil outlet
632 aperture；Close fuel feed hole 641 and injection fuel feed hole 644 be on same circumference, on the lower end surface of spool 64 equipped with into
Scraper ring 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 and injection
Fuel feed hole 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；
Oil inlet guiding valve pocket 65 outer circle side wall on be equipped with axial fuel inlet slot 651, axial fuel inlet slot 651 by oil inlet circle and close into
Oilhole 641 and injection fuel feed hole 644 communicate；Centre bore 11, high pressure fuel feed hole 12 and lateral oil-feed tank 15 are equipped on valve body 1,
The high pressure fuel feed hole 12 is communicated with centre bore 11, and the centre bore 11 is stepped bore system, including upper hole system 111, spool
Pilot hole 114 under pilot hole 113 and valve rod on hole 112, valve rod, upper hole system 111 are the mounting hole of electromagnetic valve components 7, laterally
Oil-feed tank 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 valve in spool bore 112
Core 64 and valve seat 63, spool 64 are located at the lower section of valve seat 63, and the valve rod 4 successively includes upper guide section 41 from top to bottom, upper multiple
Position spring 42, axis circlip 43, changeover portion 44, lower reset spring 45, lower guide section 46 and lower guide sleeve 47, upper reset spring 42
It is sleeved on the upper guide section 41 of valve rod 4 and by 43 axial limiting of axis circlip, oil inlet is oriented to the inner hole sleeve of valve pocket 65 mounted in upper
It is therebetween accurate clearance fit on guide section 41, oil inlet guiding valve pocket 65 is fixedly mounted on pilot hole 113 on valve rod
In, 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
On 46, lower guide section 46 is sleeved under valve rod in pilot hole 114, and the lower end surface of lower guide section 46 and the upper surface of needle-valve 21 connect
Touching, needle-valve 21 are 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 by locking cap 3,
The upper end of needle-valve fuel feed hole 23 on needle-valve body 22 is communicated with lateral oil-feed tank 15, the lower end of needle-valve fuel feed hole 23 and lower control chamber
9 communicate.
There are many embodiments of the present invention, do not enumerate one by one herein, as long as the functions such as the utility model is taken to replace
All schemes belong to the protection scope of the utility model.
Claims (4)
1. a kind of high power density high pressure common rail injector, it is characterized in that: including valve body (1), oil injection coupling (2), locking cap
(3), valve rod (4), ball sealer (5), throttling body (6) and electromagnetic valve components (7), the throttling body (6) include valve seat (63), spool
(64) sequentially coaxially divide from top to bottom with oil inlet guiding valve pocket (65), valve seat (63), spool (64) and oil inlet guiding valve pocket (65)
Cloth, is equipped with conical seat face (631) and vertical oil outlet (632) on the upper surface of valve seat (63), and vertical oil outlet (632) sets
Set the center in conical seat face (631), be equipped with upper lateral oil-feed tank (633) on lower end surface, vertical oil outlet (632) with it is upper
Lateral oil-feed tank (633) communicates；On spool (64) be equipped with close fuel feed hole (641), close oil outlet (642), lower transverse direction into
Oil groove (643), injection fuel feed hole (644) and injection oil outlet (645), wherein close fuel feed hole (641) and close oil outlet
(642) it is communicated by lower lateral oil-feed tank (643), sprays fuel feed hole (644) and injection oil outlet (645) and pass through upper lateral oil inlet
Slot (633) communicates, and closes oil outlet (642) and sprays the hole of the minimum-value aperture less than vertical oil outlet (632) of oil outlet (645)
Diameter；Axial fuel inlet slot (651) are equipped on the outer circle side wall of oil inlet guiding valve pocket (65), axial fuel inlet slot (651) passes through oil inlet
Circle is communicated with closing fuel feed hole (641) and injection fuel feed hole (644)；Centre bore (11), high pressure fuel feed hole are equipped on valve body (1)
(12) it is communicated with lateral oil-feed tank (15), the high pressure fuel feed hole (12) with centre bore (11), the centre bore (11) is step
Formula hole system, including upper hole system (111), spool bore (112), pilot hole (114) under pilot hole (113) and valve rod on valve rod, on
Hole system (111) is the mounting hole of electromagnetic valve components (7), and lateral oil-feed tank (15) is arranged on the lower end surface of valve body (1), and with
Pilot hole (114) communicates under valve rod, and spool (64) and valve seat (63) are sequentially arranged in spool bore (112), and spool (64) is located at
The lower section of valve seat (63), the valve rod (4) successively include upper guide section (41), upper reset spring (42), axis card from top to bottom
Spring (43), changeover portion (44), lower reset spring (45), lower guide section (46) and lower guide sleeve (47), upper reset spring (42) set
On the upper guide section (41) of valve rod (4) and by axis circlip (43) axial limiting, oil inlet is oriented to the inner hole sleeve of valve pocket (65)
It is therebetween accurate clearance fit, oil inlet guiding valve pocket (65) is fixedly mounted on valve rod on upper guide section (41)
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), lower reset spring
(45) it is sleeved on lower guide section (46), lower guide section (46) is sleeved in pilot hole under valve rod (114), lower guide section (46)
The upper end face contact of lower end surface and needle-valve (21), needle-valve (21) are sleeved in the centre bore of needle-valve body (22), oil injection coupling (2) by
Locking cap (3) is axially fixed to the lower end of valve body (1), the upper end of the needle-valve fuel feed hole (23) on needle-valve body (22) and laterally into
Oil groove (15) communicates, and the lower end of needle-valve fuel feed hole (23) is communicated with lower control chamber (9).
2. high power density high pressure common rail injector according to claim 1, it is characterized in that: the oil inlet circle (646) 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. high power density high pressure common rail injector according to claim 1, it is characterized in that: closing fuel feed hole (641) and spraying
Oilhole (644) are injected to be on same circumference.
4. high power density high pressure common rail injector according to claim 1, it is characterized in that: the closing fuel feed hole (641)
It is stepped hole with injection fuel feed hole (644), it is down big up small, it closes oil outlet (642) and injection oil outlet (645) is also ladder
Hole, it is up big and down small.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920306421.5U CN209604181U (en) | 2019-03-11 | 2019-03-11 | A kind of high power density high pressure common rail injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920306421.5U CN209604181U (en) | 2019-03-11 | 2019-03-11 | A kind of high power density high pressure common rail injector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209604181U true CN209604181U (en) | 2019-11-08 |
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ID=68405944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920306421.5U Active CN209604181U (en) | 2019-03-11 | 2019-03-11 | A kind of high power density high pressure common rail injector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209604181U (en) |
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2019
- 2019-03-11 CN CN201920306421.5U patent/CN209604181U/en active Active
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