CN205605345U - Pressure balance valve formula common rail injector - Google Patents
Pressure balance valve formula common rail injector Download PDFInfo
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- CN205605345U CN205605345U CN201620290768.1U CN201620290768U CN205605345U CN 205605345 U CN205605345 U CN 205605345U CN 201620290768 U CN201620290768 U CN 201620290768U CN 205605345 U CN205605345 U CN 205605345U
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- valve
- oil
- injector body
- oil injector
- pressure balance
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Abstract
The utility model discloses a pressure balance valve formula common rail injector, including injector, a piston rod, glib idol piece, pressure balance valve idol piece, the solenoid valve subassembly, injector is connected with the solenoid valve subassembly, pressure balance valve idol piece is connected with injector, injector is connected with glib idol piece, glib idol piece is including the needle valve, injector axial direction is equipped with the echelonment cavity, form sealed chamber between pressure balance valve idol piece and the piston rod, injector one side is equipped with the arch, be equipped with the injector inlet port no. 1 of slope in the arch, at the downside injector of inlet port no. 1 inlet port no. 2, injector inlet port no. 2 communicates with the oil storage chamber of a pressure balance valve idol lower part, injector and high -pressure rail union coupling, injector oil inlet and upper portion hole intercommunication, the upper portion hole passes through the orifice to be connected with sealed chamber, and the upper portion of upper portion hole is equipped with disk seat mounting hole, disk seat mounting hole and the cooperation of pressure balance valve idol, the diameter of the sealed face on piston rod upper portion is greater than the diameter of needle valve intersecting line.
Description
Technical field
This utility model relates to the fuel injection system that a kind of car combustion engine uses, and particularly relates to a kind of pressure
Balanced valve type common-rail injector.
Background technology
Now, no matter from " country 13 planning " target---energy-saving and emission-reduction, or from " made in China
2025 " for highest priority (the diesel spray pressure breaking through key components and parts manufacture reaches 2000bar),
High pressure common rail fuel injection system performance is had higher requirement, has further raising system injection pressure only
Power P, increases multi-injection ability, can meet harsh Abgasgesetz.
Existing high pressure common rail electric control fuel injector, such as Fig. 1, the structure shown in Fig. 2, Fig. 9, high pressure fuel warp
Crossing in the high pressure connection 302 on oil injector body 301 after clearance filter 303, fuel oil divides two tunnels, a road warp
Throttling pore 304 enters cavity volume 305, and a road enters oil nozzle fuel feed hole 320 through long fuel feed hole 306, arrives
Reach oil nozzle inner chamber 321.Cavity volume 306 is to be closed, by piston rod 307 and sleeve 308 are inner, the cavity formed.
The high pressure fuel of cavity volume 306 enters through passage 309 and throttling pore 310 and controls chamber 317.Work as electromagnetic valve
311 not electric time, the preload forces F of electromagnetic valve spring 312, by spool 313, ball seat 314 by close
Blocking 315 is firmly pressed on sealing cone, it is desirable to F >=P*S.Now needle-valve is closed；When electromagnetic valve 311 obtains
During electricity, under electromagnetic force, armature 316 overcomes spring force F, is lifted by spool 313, and ball valve is opened,
Control chamber 317 mesohigh fuel oil and pass through not shown through adapter cavity 318, arrival oil back chamber 319, oil back chamber 319
Spill port communicate with oil return pipe.Now needle-valve is opened, commencement of fuel injection.
Existing high pressure common rail electric control fuel injector, employing ball valve sealing structure, ball valve sealing a diameter of 802,
Raising system expulsion pressure P, increases multi-injection ability aspect and can check and balance, because wanting raising system pressure
Power P, due to P=F/S formula, it is necessary to reduce sealed diameter in the case of spring force F is constant；But reduce
Sealed diameter, can cause in the case of same lift, and controlling fuel flow communication open areas can diminish,
So can affect the spraying rate of fuel injector；In order to optimize spraying rate, it is necessary to increase lift amount；Increase lift
Amount can suppress again multi-injection ability.Therefore can not be well in the fuel system with high injection pressure of prior art
Solution should improve system expulsion pressure P further, increases a difficult problem for multi-injection ability again.
Utility model content
The purpose of this utility model is exactly for solving the problems referred to above that prior art exists, it is provided that a kind of pressure is put down
Weighing apparatus valve type common-rail injector；This utility model can carry higher system pressure (2000bar), has reality
The multi-injection ability such as now early spray, pre-spray, twice main jet, rear spray, it is possible to reduce the pressure of whole high pressure chest
Fluctuation, solves and should improve system expulsion pressure P in the fuel system with high injection pressure of prior art further,
Increase a difficult problem for multi-injection ability again.
This utility model solves the technical scheme of technical problem:
A kind of pressure balance valve type common-rail injector, including oil injector body, piston rod, oil nozzle couple, pressure
Balanced valve couple, electromagnetic valve component, described oil injector body top is connected with the bottom of electromagnetic valve component, pressure
Balanced valve couple bottom is connected with oil injector body top, and oil injector body bottom is connected with oil nozzle couple, and oil nozzle is even
Part includes that needle-valve, described oil injector body axial centre are provided with the stepped cavity that diameter from top to bottom diminishes successively,
Described stepped cavity is combined by the endoporus connection of upper and lower different-diameter, pressure balance valve coupling and piston
Forming annular seal space between bar, described oil injector body is provided with projection, in projection near the shoulder hole side on top
It is provided with the oil injector body fuel feed hole one of the inclination that the top endoporus with stepped cavity connects, at fuel feed hole one
Downside is provided with the oil injector body fuel feed hole two of inclination, described oil injector body fuel feed hole two and pressure balance valve coupling
Shoe cream room connection in the middle part of the stepped cavity of bottom；Described oil injector body passes through joint, oil injector body oil-feed
Mouth is connected with high voltage rail pipe, and described oil injector body oil-in is connected with top endoporus by oil injector body fuel feed hole,
Described top endoporus is connected with annular seal space by the throttle orifice on pressure balance valve coupling, described top endoporus
Top is provided with valve seat installing hole, and described valve seat installing hole coordinates with pressure balance valve coupling；On described piston rod
The diameter of the sealing surface in portion is more than the diameter of needle-valve intersection.
Described pressure balance valve coupling include valve body, spool, guide finger, described valve body include top valve seat,
The stop collar of bottom, described valve seat coordinates with valve seat installing hole, and the bottom of stop collar is cone, described circle
Cone seals with the lower inner surface of stepped upper chamber and coordinates, the seat bottom portion position of described valve body and spray
Oil body is formed to seal and coordinates, and stepped upper chamber forms one and seals space, and cone is by stepped
Portion's cavity seals off with stepped lower cavity, and valve body upper end is provided with upper opening, sets at upper opening
Axial positioning sleeve, axial positioning sleeve external cylindrical surface is had to be provided with external screw thread, in the upper opening of oil injector body is provided with
Screw thread, axial positioning sleeve is threaded connection with oil injector body, the axial bore on described valve seat top and spool
Big external cylindrical surface coordinates, and spool cylindrical and valve seat axial bore are matched in clearance, the valve seat of described valve body upper
End face is formed to seal with the position, lower surface of spool and coordinates, and forms balanced valve at the diameter sealing cooperation position close
Envelope diameter, described axial bore near bottom position be provided with radially unload oilhole, described axial positioning sleeve
Being provided with annular gap between endoporus and valve seat cylindrical, described electromagnetic valve component includes electromagnetic valve, the rank being connected
Ferrum, the top of spool is connected with armature, and the top of described annular gap communicates with the oil outlet of electromagnetic valve, institute
State guide finger to be located in the axial bore of spool, between the axial bore of spool and guide finger external cylindrical surface use tightly
Gap coordinates；
Described guide finger upper end is positioned in the axial groove of electromagnetic valve bottom, and it is little that the lower end of described guide finger is provided with diameter
Sealed end, described sealed end coordinates with oil outlet upper gap, and the bottom of described oil outlet and throttle orifice are even
Connecing, throttle orifice is connected with pod apertures, and pod apertures is connected with annular seal space, described annular seal space position spacing sheathed
Having radially fuel feed hole, described radial direction fuel feed hole is connected with oil injector body oil-in, described spool and electromagnetic valve
Armature connects, and described guide finger is set with spring one, and armature upper surface is connected with compression spring one lower end,
Spring one upper end is connected with the spring retainer end of electromagnetic valve；
Valve body in stop collar position is provided with axial hole, bottom, and the top of described piston rod is joined with axial hole, bottom
Closing, piston rod top forms annular seal space with valve seat bottom, after the lower end of piston rod passes stepped lower cavity
Coordinating with the needle-valve upper end of oil nozzle couple and contact, described needle-valve is located in the endoporus of valve pocket, described valve pocket top
Being connected with oil injector body bottom, be provided with compression spring two in valve pocket endoporus, spring two is sleeved on the top of needle-valve,
Spring two lower end is connected with the boss of needle-valve, and the upper end of spring two contacts with the bottom end face of oil injector body, logical
Cross the bottom end face axial limiting of oil injector body.
Described balanced valve sealed diameter 803 is in existing structure 2-3 times of ball valve sealing diameter 802.
Described valve seat upper end mesopore uses thick matched in clearance with spool cylindrical, the most only play the guiding role, does not rise close
Envelope effect；
Described spool mesopore uses tight matched in clearance with guide finger cylindrical, seals herein；
The moving magnet that described spool is into a single integrated structure with armature laser welding, the end face welding post-treatment of armature makes to put down
Face degree is in the range of setting.
The described guide finger net lift moved up and down in oil outlet is 0.46～0.52mm.
The beneficial effects of the utility model:
1. this utility model uses the diameter diameter more than needle-valve intersection of described piston rod upper end, piston
The downward pressure that bar produces is more than upwarding pressure that needle-valve produces, it is possible to carry higher system pressure
(2000bar), there is realization early spray, pre-spray, main jet, spray and fill spray etc. multi-injection ability afterwards, it is possible to
Reduce the pressure oscillation of whole high pressure chest, solve and the fuel system with high injection pressure of prior art should enter one
Step raising system expulsion pressure P, increases a difficult problem for multi-injection ability again.
2. the pressure balance valve coupling of this utility model employing, oil injector body, oil nozzle couple, electromagnetic valve component shape
Becoming complete innovation structure, wherein spool cylindrical and valve seat axial bore are matched in clearance, play guide effect,
The sealing that the upper surface of the valve seat of valve body can form closure good with the position, lower surface of spool coordinates, spool
Axial bore and guide finger external cylindrical surface use tight matched in clearance, it is desirable to leakage rate is little, seal；
The lower end of guide finger is provided with the sealed end that diameter is little, and described sealed end coordinates with oil outlet upper gap, it is ensured that
Action is the most reliable.By using pressure balance valve arrangement so that spool is in certainly under high pressure fuel effect
Poised state, it is achieved that the increase of system pressure is no longer limited by sealed diameter and spring one preload,
It is simultaneously achieved, under conditions of improving system expulsion pressure P, there is multi-injection ability, significantly optimize and carry
High fuel injection rate.
3. by balanced valve sealed diameter is ball valve sealing diameter 2-3 times so that in the case of same lift,
Fuel flow communication area increases, and improves the spraying rate of fuel oil；Fuel oil circulation increase within the unit interval simultaneously
In the case of, reduction lift that can be suitable, thus optimize the quick response of fuel injector, it is achieved that multi-injection
Reliability.
4. oil injector body is provided with liquid storage cylinder, reduces the rail pressure fluctuation caused by oil spout.Multi-injection can be ensured
Accuracy and concordance, make twice injection clearance control within 200us, be simultaneously introduced liquid storage cylinder, minimum
Change the loss of mouth end pressure, eliminated static system leakage, decreased system dynamics leakage, make oil injector body
Bear higher system pressure.
5. spool is integral with the armature laser welding of electromagnetic valve component, make power moving magnet, the end face welding of armature
Post-treatment makes flatness ensure in the range of setting.
Accompanying drawing explanation
Accompanying drawing illustrates:
Fig. 1 is prior art common-rail injector structural representation；
Fig. 2 is Fig. 1 structure partial enlarged drawing；
Fig. 3 is this utility model electric-controlled fuel injector structural representation；
Fig. 4 is the structure partial enlarged drawing on the top of Fig. 3；
Fig. 5 is the partial enlarged drawing of Fig. 3 A；
Fig. 6 is the partial enlarged drawing of Fig. 3 B；
Fig. 7 is structure and the annexation schematic diagram of pressure balance valve coupling；
Fig. 8 is the C partial enlarged drawing of Fig. 7；
Fig. 9 is ball valve sealing diameter enlarged drawing in existing structure Fig. 1；
Figure 10 is balanced valve sealed diameter enlarged drawing in this utility model Fig. 4.
Detailed description of the invention
In order to be more fully understood that this utility model, explain in detail enforcement of the present utility model below in conjunction with the accompanying drawings
Mode.
Such as Fig. 3 to Fig. 8, shown in Figure 10, a kind of pressure balance valve type common-rail injector, including oil injector body
2, piston rod 6, oil nozzle couple, pressure balance valve coupling, electromagnetic valve component, described oil injector body 2 top
Being connected with the bottom of electromagnetic valve component, pressure balance valve coupling bottom is connected with oil injector body 2 top, oil spout
Body 2 bottom is connected with oil nozzle couple, and oil nozzle couple includes that needle-valve 3, described oil injector body 2 axial centre set
Having the stepped cavity that diameter from top to bottom diminishes successively, described stepped cavity is by upper and lower different-diameter
Hole connection combines, and forms annular seal space 4, described oil injector body between pressure balance valve coupling and piston rod 6
2 are provided with projection 212 near the shoulder hole side on top, are provided with the top endoporus with stepped cavity in projection
The oil injector body fuel feed hole 1 of the inclination of 214 connections, is provided with the spray of inclination in the downside of fuel feed hole 1
Oil body fuel feed hole 2 216, described oil injector body fuel feed hole 2 216 and the ladder of pressure balance valve coupling bottom
Shoe cream room 213 in the middle part of shape cavity connects；At described oil injector body 2 by joint, oil injector body oil-in
210 are connected with high voltage rail pipe 1, and described oil injector body oil-in 210 passes through oil injector body fuel feed hole 211 with upper
Portion's endoporus 214 connects, and described top endoporus 214 is by the throttle orifice on pressure balance valve coupling and annular seal space 4
Connecting, the top of described top endoporus 214 is provided with valve seat installing hole 215, described valve seat installing hole 215 and pressure
Dynamic balance valve coupling coordinates；The diameter of the sealing surface 61 on described piston rod 6 top is more than needle-valve 3 intersection 40
Diameter, seal straight of valve so the downward pressure that produces of piston rod is more than upwarding pressure that needle-valve produces,
Now needle-valve is in closure state.
Pressure balance valve coupling includes valve body 7, spool 12, guide finger 14, and described valve body 7 includes the valve on top
Seat 13, the stop collar 75 of bottom, described valve seat 13 coordinates with valve seat installing hole 215, stop collar 75 times
Portion is cone 77, and described cone seals with the lower inner surface of stepped upper chamber 214 and coordinates, institute
Valve seat 13 bottom position stating valve body 7 coordinates with oil injector body 2 formation sealing so that stepped upper chamber
214 form one seals space, by cone 77 by stepped upper chamber 214 and stepped lower chamber
Body 213 seals off, and valve body 7 upper end is provided with upper opening, is provided with axial positioning sleeve 34 at upper opening,
Axial positioning sleeve 34 external cylindrical surface is provided with external screw thread, and the upper opening of oil injector body 2 is provided with female thread, axially
Positioning sleeve 34 is threaded connection with oil injector body 2, the axial bore on described valve seat 13 top and spool 12
Big external cylindrical surface coordinates, and spool 12 cylindrical and valve seat 13 axial bore are matched in clearance, only play the guiding role,
It is good that the upper surface of the valve seat 13 of described valve body 7 and the position, lower surface 121 of spool 12 can form closure
Sealing coordinate, seal cooperation position diameter formed balanced valve sealed diameter, described axial bore is being leaned on
Nearly bottom position be provided with radially unload oilhole 10, the endoporus of described axial positioning sleeve 34 and valve seat 13 cylindrical it
Between be provided with annular gap 35, described in unload oilhole 10 and connect with annular gap 35, described electromagnetic valve component includes
The electromagnetic valve 5 that is connected, armature 8, the top of spool 12 is connected with armature 8, described annular gap 35
Top connects with the oil outlet of electromagnetic valve, and described guide finger 14 is located in the axial bore of spool 12, spool
The axial bore of 12 uses tight matched in clearance with guide finger 14 external cylindrical surface, it is desirable to leakage rate is little, play sealing makees
With, gap is 0.0025～0.004mm.
As required, described balanced valve sealed diameter can be 2 times of ball valve sealing diameter, 2.5 times, or
3 times.Making in the case of same lift, fuel flow communication area increases, and improves the spraying rate of fuel oil.
Described guide finger 14 upper end is positioned in the axial groove of electromagnetic valve bottom, and the lower end of described guide finger 14 is provided with
The sealed end 141 that diameter is little, described sealed end 141 coordinates with oil outlet 15 upper gap, described oil outlet
Bottom be connected with throttle orifice 72, throttle orifice 72 is connected with pod apertures 73, and pod apertures is connected with annular seal space 4,
The stop collar of described annular seal space 4 position is provided with radially fuel feed hole 76, described radial direction fuel feed hole 76 and oil injector body
Oil-in 210 connects, and described spool 12 is connected with the armature 8 of electromagnetic valve 5, and described guide finger 14 overlaps
Equipped with spring 1, armature 8 upper surface is connected with compression spring 1 lower end, spring 1 upper end and electromagnetic valve
The spring retainer end of 5 connects.The cylindrical of guide finger 14 play the guiding role to spring.
Valve body 7 in stop collar position is provided with axial hole, bottom, and the top of described piston rod 6 is axial with bottom
Hole coordinates, and piston rod 6 top forms annular seal space 4 with valve seat 13 bottom, and the lower end of piston rod 6 passes ladder
Coordinating with needle-valve 3 upper end of oil nozzle couple after shape lower cavity 213 and contact, described needle-valve 3 is located at valve pocket 31
Endoporus in, described valve pocket 31 top is connected by threaded engagement with oil injector body 2 bottom, in valve pocket endoporus
Being provided with compression spring 2 131, spring two is sleeved on the boss of the top of needle-valve 3, spring two lower end and needle-valve
32 connect, and the upper end of spring two contacts with the bottom end face of oil injector body 2, by the bottom of oil injector body 2
End face axial is spacing.
The sealed end 141 of described guide finger 14 and oil outlet 15 use matched in clearance, gap be 0.015～
0.020mm, guide finger is only play the guiding role by oil outlet.Described spool 12 and the armature 8 of electromagnetic valve component
Laser welding is integral, make power moving magnet, armature large end face welding post-treatment, planarity requirements 0.005um
Within；Armature 8 and electromagnetic valve adhesive stroke h2 are 0.08～0.09mm；Armature 8 rising height h1 is
0.025～0.035mm.
The described guide finger 14 net lift h3 moved up and down in oil outlet is 0.46～0.52mm.
Work process of the present utility model and principle explanation:
When electromagnetic valve 5 is energized under the control of vehicle electronic control unit ECU, the armature 8 on equilibrated valve
Under the effect of electromagnetic force, overcoming the spring force of the spring 1 on electromagnetic valve to be lifted up, guide finger is upwards
Mobile, band movable valve plug 12 moves up, thus drives equilibrated valve to open, and high pressure fuel is from valve seat
Unload oilhole 10 to flow out, by spill port oil sump tank not shown at electromagnetic valve.In annular seal space the pressure of 4 will under
Fall, at this moment acts on the active force that the active force upwards on needle-valve 3 is downward more than piston rod 6, and needle-valve exists
Being lifted up under the effect of high pressure fuel, fuel oil flows through spray orifice and produces high-pressure injection.
When electromagnetic valve 5 after power-off, acts on the spool 12 of pressure balance valve under ECU control at spring 1
Take a seat, in annular seal space, set up high pressure, needle-valve under the effect of spring 2 131 power and piston rod 6 again
Close, end of injection.Due to the accurate control of ECU, common-rail injector can be complete in a cycle of operation
Become multi-injection.
During work, the high pressure fuel from high voltage rail pipe 1 enters oil injector body 2 through unshowned fuel inlet fitting,
High pressure fuel is divided into two-way, and a road fuel oil is descending, acts on needle-valve 3 conical surface through descending pipeline；Another road
Fuel oil is up, enters the annular seal space 4 forming high pressure through up pipeline.
When electromagnetic valve 5 is in cold state, act on pressure downward on piston rod 6 in annular seal space same
Pressure upwards is acted on needle-valve 3 identical in pintle nozzle match-ing parts.Owing to the diameter of piston rod 6 end face is more than pin
The diameter of valve 3 intersection, so the downward pressure that piston rod produces is more than upwarding pressure that needle-valve produces,
Now needle-valve is in closure state；When high pressure fuel arrives annular seal space 4, due to piston rod 6 cylindrical and valve seat
13 endoporus are formed and seal, and spool 12, under spring once acts on, is tightly pressed against on valve seat 13 inner face, shape
Become to control chamber 15.Now high pressure fuel spool 12 is produced upwards, down force, by valve core inside structure
The bearing area being designed as active force is identical, so spool 12 active force is mutually balanced by high pressure fuel.
Spool 12 cylindrical and valve seat 13 mesopore are designed as matched in clearance, only play the guiding role and reduce relative movement
Time frictional resistance, gap is 0.015～0.020mm.Spool 12 mesopore is designed as with guide finger 14 cylindrical
Tight matched in clearance, it is desirable to leakage rate is little, seals, and gap is 0.0025～0.004mm.
Described spool 12 external cylindrical surface and bottom coordinate the seal face contacted to be provided with coating with valve seat.By being coated with
Layer processes and can reduce abrasion, increases durability.
This utility model compared with prior art, has the advantage that
1. the pressure balance valve arrangement in this utility model, key point is that spool is under high pressure fuel effect
Self-balancing state, the therefore increase of system pressure, no longer limited by sealed diameter and spring one preload；
2. increase due to sealed diameter, about three times of ball valve sealing diameter, in the case of same lift, fuel oil
Circulation area increases, and improves the spraying rate of fuel oil；
3. in the case of within the unit interval, fuel oil circulation increases, reduction lift that can be suitable, such that it is able to excellent
Change the quick response of fuel injector, make multi-injection be possibly realized；
4. the design of oil injector body liquid storage cylinder, reduces the rail pressure fluctuation caused by oil spout.Multi-injection can be ensured
Accuracy and concordance, make two injection clearance control within 200us, be simultaneously introduced liquid storage cylinder, minimum
Change the loss of mouth end pressure, reduced and guide leakage, make oil injector body bear higher system pressure.
Although the detailed description of the invention of utility model is described by the above-mentioned accompanying drawing that combines, but not to this reality
With the restriction of novel protected scope, on the basis of the technical solution of the utility model, those skilled in the art
Need not to pay various amendments or deformation that creative work can make still at protection domain of the present utility model
Within.
Claims (6)
1. a pressure balance valve type common-rail injector, including oil injector body, piston rod, oil nozzle couple, pressure
Dynamic balance valve coupling, electromagnetic valve component, is characterized in that, under described oil injector body top and electromagnetic valve component
Portion connects, and pressure balance valve coupling bottom is connected with oil injector body top, oil injector body bottom and oil nozzle couple
Connecting, oil nozzle couple includes that needle-valve, described oil injector body axial centre are provided with diameter from top to bottom and diminish successively
Stepped cavity, described stepped cavity by upper and lower different-diameter endoporus connect combine, pressure put down
Forming annular seal space between weighing apparatus valve coupling and piston rod, described oil injector body is provided with near the shoulder hole side on top
Projection, is provided with the oil injector body fuel feed hole one of the inclination that the top endoporus with stepped cavity connects in projection,
The oil injector body fuel feed hole two of inclination, described oil injector body fuel feed hole two and pressure it is provided with in the downside of fuel feed hole one
Shoe cream room connection in the middle part of the stepped cavity of dynamic balance valve coupling bottom；Described oil injector body by joint,
Oil injector body oil-in is connected with high voltage rail pipe, described oil injector body oil-in by oil injector body fuel feed hole with
Top endoporus connection, described top endoporus is connected with annular seal space by the throttle orifice on pressure balance valve coupling,
The top of described top endoporus is provided with valve seat installing hole, and described valve seat installing hole coordinates with pressure balance valve coupling；
The diameter of the sealing surface on described piston rod top is more than the diameter of needle-valve intersection.
2. pressure balance valve type common-rail injector as claimed in claim 1, is characterized in that, described pressure is put down
Weighing apparatus valve coupling includes that valve body, spool, guide finger, described valve body include the stop collar of the valve seat on top, bottom,
Described valve seat coordinates with valve seat installing hole, and the bottom of stop collar is cone, described cone with stepped on
The lower inner surface of portion's cavity seals and coordinates, and the seat bottom portion position of described valve body is formed with oil injector body and seals
Coordinate, stepped upper chamber formed one seal space, cone by stepped upper chamber with stepped
Lower cavity seals off, and valve body upper end is provided with upper opening, is provided with axial positioning sleeve at upper opening,
Axial positioning sleeve external cylindrical surface is provided with external screw thread, and the upper opening of oil injector body is provided with female thread, axially positions
Set is threaded connection with oil injector body, and the axial bore external cylindrical surface big with spool on described valve seat top coordinates,
Spool cylindrical and valve seat axial bore are matched in clearance, the upper surface of the valve seat of described valve body and the lower end of spool
Position, face formed seal coordinate, seal cooperation position diameter formed balanced valve sealed diameter, described axially
Endoporus is being provided with the oilhole that unloads radially near bottom position, the endoporus of described axial positioning sleeve and valve seat cylindrical it
Between be provided with annular gap, described electromagnetic valve component includes electromagnetic valve, the armature being connected, the top of spool with
Armature connects, and the top of described annular gap is connected with the spill port of electromagnetic valve, and valve is located at by described guide finger
In the axial bore of core, the axial bore of spool uses tight matched in clearance with guide finger external cylindrical surface；
Described guide finger upper end is positioned in the axial groove of electromagnetic valve bottom, and it is little that the lower end of described guide finger is provided with diameter
Sealed end, described sealed end coordinates with oil outlet upper gap, and the bottom of described oil outlet and throttle orifice are even
Connecing, throttle orifice is connected with pod apertures, and pod apertures is connected with annular seal space, described annular seal space position spacing sheathed
Having radially fuel feed hole, described radial direction fuel feed hole is connected with oil injector body oil-in, described spool and electromagnetic valve
Armature connects, and described guide finger is set with spring one, and armature upper surface is connected with compression spring one lower end,
Spring one upper end is connected with the spring retainer end of electromagnetic valve；
Valve body in stop collar position is provided with axial hole, bottom, and the top of described piston rod is joined with axial hole, bottom
Closing, piston rod top forms annular seal space with valve seat bottom, after the lower end of piston rod passes stepped lower cavity
Coordinating with the needle-valve upper end of oil nozzle couple and contact, described needle-valve is located in the endoporus of valve pocket, described valve pocket top
Being connected with oil injector body bottom, be provided with compression spring two in valve pocket endoporus, spring two is sleeved on the top of needle-valve,
Spring two lower end is connected with the boss of needle-valve, and the upper end of spring two contacts with the bottom end face of oil injector body, logical
Cross the bottom end face axial limiting of oil injector body.
3. pressure balance valve type common-rail injector as claimed in claim 2, is characterized in that, described balanced valve is close
Seal a diameter of ball valve sealing diameter 2-3 times.
4. pressure balance valve type common-rail injector as claimed in claim 2, is characterized in that, described guide finger
Sealed end uses matched in clearance with oil outlet.
5. pressure balance valve type common-rail injector as claimed in claim 2, is characterized in that, described spool and electricity
The moving magnet that the armature laser welding of electromagnetic valve component is into a single integrated structure, the end face welding post-treatment of armature makes plane
Spend in the range of setting.
6. pressure balance valve type common-rail injector as claimed in claim 2, is characterized in that, described guide finger
The net lift moved up and down in oil outlet is 0.46～0.52mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620290768.1U CN205605345U (en) | 2016-04-08 | 2016-04-08 | Pressure balance valve formula common rail injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620290768.1U CN205605345U (en) | 2016-04-08 | 2016-04-08 | Pressure balance valve formula common rail injector |
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| Publication Number | Publication Date |
|---|---|
| CN205605345U true CN205605345U (en) | 2016-09-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620290768.1U Withdrawn - After Issue CN205605345U (en) | 2016-04-08 | 2016-04-08 | Pressure balance valve formula common rail injector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105673282A (en) * | 2016-04-08 | 2016-06-15 | 龙口龙泵燃油喷射有限公司 | Pressure-balanced valve type common-rail fuel injector |
| CN106545449A (en) * | 2017-01-18 | 2017-03-29 | 哈尔滨工程大学 | A kind of On Fluctuations oil return electric-controlled fuel injector |
-
2016
- 2016-04-08 CN CN201620290768.1U patent/CN205605345U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105673282A (en) * | 2016-04-08 | 2016-06-15 | 龙口龙泵燃油喷射有限公司 | Pressure-balanced valve type common-rail fuel injector |
| CN105673282B (en) * | 2016-04-08 | 2018-05-18 | 龙口龙泵燃油喷射有限公司 | Pressure balance valve type common-rail injector |
| CN106545449A (en) * | 2017-01-18 | 2017-03-29 | 哈尔滨工程大学 | A kind of On Fluctuations oil return electric-controlled fuel injector |
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