CN1888411A - High pressure common rail electric control fuel injector sealing device - Google Patents
High pressure common rail electric control fuel injector sealing device Download PDFInfo
- Publication number
- CN1888411A CN1888411A CN 200610104154 CN200610104154A CN1888411A CN 1888411 A CN1888411 A CN 1888411A CN 200610104154 CN200610104154 CN 200610104154 CN 200610104154 A CN200610104154 A CN 200610104154A CN 1888411 A CN1888411 A CN 1888411A
- Authority
- CN
- China
- Prior art keywords
- common rail
- wedge
- fuel injector
- high pressure
- pressure common
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
The present invention relates to a high-pressure common rail fuel injector sealing device. It mainly includes the following several portions: high-pressure common rail fuel injector self-body, wedge-shaped seal ring and valve linear. A wedge-shaped seal ring is mounted in the lower end of annular space formed between inner hole of fuel injector self-body and minimum outside cylindrical surface of valve liner. The adoption of said invention can be substituted for solid seal ring with rectangular section in high-pressure common rail fuel injector of Bosch company so as to implement reliable seal of axial gap between value liner and inner hole of fuel injector in the high-pressure common rail injector.
Description
Technical field: the present invention is a kind of high pressure common rail electric control fuel injector sealing device, is applied in the diesel engine high-pressure co-rail electronic control injection system.
Background technique: the common rail electric-controlled injection system of CR series high voltage of German Bosch company is current state-of-the-art diesel electric-controlled injection system, comprising: electric-controlled fuel injector, high-pressure common rail, high pressure oil pump, pressure regulator valve, pressure-limit valve, restrictor, various sensors and ECU (Electrical Control Unit) etc.And that high pressure common rail electric control fuel injector is it is most crucial, the parts of most critical, comprising the high speed electromagnetic valve member: comprising: moving iron core, field coil, Returnning spring, static iron core, return tube, big nut, Returnning spring, moving iron core guide rod is adjusted packing ring greatly, the guiding pole socket, ditty is put in order packing ring, steel ball.Hydraulic tappet and valve pocket parts: comprising: fuel-displaced damping hole, oil-feed damping hole, hydraulic tappet, valve pocket, seal ring.Oil nozzle parts: comprising: nozzle spring, attachment post, needle-valve and oil injector body etc.
The function of high-speed electromagnetic valve is to realize the open and close of injector valve, when the solenoid valve dead, because the effect of Returnning spring in the solenoid valve static iron core, steel ball cuts out the fuel-displaced throttle orifice on the valve pocket, at this moment, in the oil injector body in the valve pocket pressure in the pressure accumulation chamber in control chamber and the needle-valve all equal common rail pressure, because the control chamber active area in the valve pocket of hydraulic tappet top is greater than the active area in pressure accumulation chamber in the needle-valve of tappet bottom, the pressure that acts on the control chamber on tappet top closes oil nozzle with nozzle spring power, and oil sprayer is in not oil spout state.
When ECU (Electrical Control Unit) encourages to solenoid valve, because the suction of electromagnet, moving iron core moves upward, steel ball leaves ball seat under the control chamber hydraulic pressure in valve pocket, fuel-displaced throttle orifice by steel ball sealing is opened draining, the control chamber oil liquid pressure drops to certain numerical value, and this numerical value is decided by the flow-rate ratio in fuel-displaced throttle orifice and meter in hole.Act on injector valve bottom from the high pressure oil that is total to rail this moment, injector valve risen open commencement of fuel injection.Fuel injection quantity is decided by unlatching duration (pulsewidth that is decided by ECU (Electrical Control Unit) output), oil nozzle Flow characteristics, injection pressure and the needle lift of oil nozzle.When solenoid valve outage, the moving iron core of solenoid valve moves downward and promotes the steel ball fuel-displaced throttle orifice of sealing of taking a seat under the effect of Returnning spring, and the oil pressure in the control chamber rises, and promotes hydraulic tappet and makes the needle-valve oil nozzle of taking a seat stop oil spout.
High pressure common rail electric control fuel injector will be realized high-pressure injection, and the sealing of each link is most important.Comprising many high pressure static seals and motive sealing.Wherein to realize moving to axial between hydraulic tappet and the valve pocket endoporus,, also be motive sealing herein for being slidingly matched.Valve pocket and oil injector body utilize shoulder hole realization stationary fit in valve pocket cylindrical and the oil injector body, and realize the radial location of valve pocket in oil injector body with this, fit and realize the axially locating of valve pocket in oil injector body in the omoplate face of valve pocket and the hollow plane of oil injector body.But also have a circular groove between valve pocket and the injector body, be full of the ultrahigh pressure fuel oil in this groove.High pressure fuel will pass through a valve pocket damping hole radially when work, promptly the meter in hole enters in the valve pocket, acts on then on the hydraulic tappet, and the control needle-valve is realized oil spout.Fuel oil in this circular groove also can utilize the radial clearance between valve pocket shoulder potassium plane and the oil injector body hollow plane to leak, but also can utilize the minimum cylindrical of valve pocket and the axial clearance between the oil injector body endoporus to leak.If the leakage at this two place can not be controlled effectively, then the superhigh pressure jetting in the high pressure common rail injector is impossible realize.Wherein the radial gap between valve pocket cylindrical shoulder potassium face and the oil injector body hollow plane can reduce the slit by the mature technology of diesel engine tradition injection system, to realize reliable static seal.But the leakage that the axial clearance between valve pocket cylindrical and the oil injector body endoporus forms can't resolve with traditional sealing technique.Bosch company is a sealed solid circle of having adorned the composite material of a rectangular cross-section in the circular groove between valve pocket and oil injector body endoporus, and the concrete composition of its material is unclear.The sealing mechanism of this Sealing is different fully with the sealing mechanism of general contact seal circle.General contact seal circle at first will have certain pre compressed magnitude, thereby produce pre-pressing force on sealing surface when assembling.When the unit impacting force on the unit area during, promptly constituted sealing greater than fluid pressure.And when fluid pressure raise, seal ring made the impacting force on the sealing surface further improve because of being squeezed, so still can realize reliable sealing.This seal ring all must be contained in the groove, otherwise cisco unity malfunction.
Summary of the invention:
The objective of the invention is to propose a kind of novel high-pressure common rail electric-controlled fuel injector seal ring, specifically a kind of wedge-type seal circle, the sealed solid circle of the composite material of the rectangular cross-section of installing in the circular groove of replacement Bosch company between valve pocket and oil injector body endoporus.This wedge-type seal circle cylindrical has an inclined-plane, and correspondingly the oil injector body mesopore also has an inclined-plane or the conical surface.Circle is the cylndrical surface in the wedge-type seal circle, realizes cooperating with the minimum cylindrical of valve pocket place with assurance.This wedge-type seal is packed into behind the oil injector body, and high pressure fuel acts on its top, on the promptly radial ringed plane, seal ring is pushed in wedge slot, thereby realizes the sealing of reliable valve pocket and oil sprayer endoporus axial clearance.Realize high pressure even ultrahigh pressure to guarantee the liquid in circular groove.This wedge-type seal circle can be teflon circle or nylon ring.Can make by the metal cutting method for processing.The wedge-type seal circle is identical with the angle nominal size of the oil injector body hollow conical surface, but both tolerance differences could guarantee wedge-type seal circle reliable sealing like this.According to sealing principle, guarantee that two key factors of sealing are sealing load and sealed width.So-called sealing load is exactly the contact pressure of seal ring and part surface; Sealed width is exactly that seal ring contacts axial length partly with part surface.Obviously, if increase sealing load and sealed width, then sealing strengthens, otherwise then weakens.But the increase of sealing load certainly will strengthen frictional force, but this should not be a problem to static seal.And the increase of sealed width also will strengthen the size of seal arrangement.The sealing load of wedge-type seal is to utilize high pressure fuel to act on the top of seal ring, promptly on the circular radial planar annular and produce.Therefore, improve sealing load, the width on this radial ringed plane is that radial dimension should strengthen.But because the restriction of oil injector body hollow size and valve pocket size, this size can not increase.Therefore from improving sealing load, the axial seal width then can not be too wide, otherwise the unit pretightening force of axial seal face will descend, thereby influences sealing, and therefore, here seal length has individual optimum value.
Beneficial effect:
Adopt the present invention can substitute the sealed solid circle of the rectangular cross-section in the high pressure common rail injector of Bosch company, thereby realize the sealing of valve pocket and oil sprayer endoporus axial clearance in the reliable high pressure common rail injector, set up ultrahigh pressure, the most critical of realization high pressure common rail injector, the most essential function-ultrahigh pressure fuel injection to guarantee the liquid in this circular groove.
Description of drawings:
Fig. 1 is the structural drawing of high pressure common rail injector
Fig. 2 is the partial enlarged drawing of high pressure common rail injector
Fig. 3 is the wedge-type seal circle
As seen from Figure 1, Figure 2, this oil sprayer comprises:
1, high speed electromagnetic valve member, be used to control the fuel injection quantity and the injection timing of oil sprayer, it comprises: a static iron core (2), a moving iron core (3), a Returnning spring (4), moving iron core is installed on the spool (5), spool (5) is installed in the guide way (6), and guide way (6) is pressed in one by nut (7) and adjusts on the packing ring (8), adjusts packing ring (8) and is pressed on the valve pocket (9), valve pocket (9) is pressed on the hollow omoplate face of oil injector body (1), thereby realizes the axially locating of guide way (6).
2, hydraulic tappet (10) and valve pocket (9) parts, hydraulic tappet (10) upper end cylindrical and valve pocket (9) endoporus are slidingly matched, a damping hole (a) is radially arranged on the valve pocket (9), an axial damping hole (b), axial damping hole (b) outlet has a steel ball (11), steel ball (11) is by spool (5) control, and the unlatching that realizes damping hole (b) is with closed.
3, oil injector body, the fuel oil that is come by high-pressure common rail is entered by oil-feed interface (W), be divided into two-way then: a route oilhole (Y) enters needle-valve pressure accumulation chamber, one route oilhole (X) enters the annulus (Z) that forms by between oil injector body endoporus and valve pocket (9) cylindrical, radially the damping hole (a) of the fuel oil of this annulus (Z) on valve pocket (9) enters the endoporus of valve pocket (9), affacts on the steel ball (11) through axial damping hole (b) then.There is a wedge-type seal circle (18) annulus (Z) lower end that forms between oil injector body endoporus and valve pocket (9) cylindrical, realizes high pressure sealing.
4, oil nozzle parts comprise a needle-valve (12) and needle-valve body (13), and the needle-valve upper end combines with the lower end of hydraulic tappet (10), and fixing by nut (14).Needle-valve (12) upper end also has a packing ring (15), and a spring (16) is arranged on this packing ring, and this spring is the secondary spring that needle-valve is taken a seat.
In addition, also comprise: attaching nut (19), adjust pad (20) greatly, o RunddichtringO (21), static iron core briquetting (22), moving Returnning spring packing ring unshakable in one's determination (23), setscrew nut (24), end cap (25), upper valve body (26), o RunddichtringO (27), packing ring (28), o RunddichtringO (29), coil (30), collar (31).
The present invention will be further described below in conjunction with accompanying drawing:
This wedge-type seal circle (18) cylindrical has an inclined-plane, and correspondingly the oil injector body mesopore also has an inclined-plane or the conical surface.Wedge-type seal circle (18) endoporus is the cylndrical surface, realizes cooperating with the minimum cylindrical of valve pocket (9) place with assurance.This wedge-type seal circle (18) is packed into behind the oil injector body, and high pressure fuel acts on its top, on the promptly radial ringed plane, wedge-type seal circle (18) is pushed in wedge slot, thereby realizes the sealing of reliable valve pocket and oil sprayer endoporus axial clearance.Realize high pressure even ultrahigh pressure to guarantee the liquid in circular groove.The oil injector body endoporus is after installing seal ring, and cross section, its underpart will process the annular space of a right-angled triangle, so that seal ring has the space of certain compressive strain; This wedge-type seal circle can be teflon circle or nylon ring.Can make by the metal cutting method for processing.Wedge-type seal circle (18) is identical with the angle nominal size of the oil injector body hollow conical surface, but both tolerance differences could guarantee wedge-type seal circle reliable sealing like this.According to sealing principle, guarantee that two key factors of sealing are sealing load and sealed width.So-called sealing load is exactly the contact pressure of seal ring and part surface; Sealed width is exactly that seal ring contacts axial length partly with part surface.The working pressure of wedge-type seal circle (18) can reach 160MPa.The endoporus of wedge-type seal circle (18) is a cylndrical surface, and cylindrical is a conical surface, and the upper-end surface is a planar annular, and following section is a planar annular or wedge angle.
Specific embodiments:
1, the material of wedge-type seal circle can be teflon or nylon, can make by the metal cutting method for processing, also can grinding tool injection moulding processing.
2, the wedge-type seal circle is identical with the angle nominal size of the oil injector body hollow conical surface, but both tolerance differences could guarantee wedge-type seal circle reliable sealing like this.The oil injector body hollow conical surface can realize that its surface roughness can not be too low by the metal cutting method for processing.
Claims (5)
1. high pressure common rail electric control fuel injector superhigh pressure sealing device, comprise: a high pressure common rail injector body (1), a wedge-type seal circle (18), a valve pocket (9), it is characterized in that: a wedge-type seal circle (18) is equipped with in annulus (Z) lower end that forms between oil injector body (1) endoporus and the minimum external cylindrical surface of valve pocket (9), wedge-type seal circle (18) combines with oil injector body (1) inner conical surface, the minimum external cylindrical surface of valve pocket (9), just forms a superhigh pressure sealing to minimum external cylindrical surface of valve pocket (9) and oil injector body (1) endoporus axial clearance;
2, according to the described high pressure common rail electric control fuel injector sealing device of claim 1, it is characterized in that: the endoporus of wedge-type seal circle (18) is a cylndrical surface, cylindrical is a conical surface, and the upper-end surface is a planar annular, and following section is a planar annular or wedge angle;
3. according to the described high pressure common rail electric control fuel injector sealing device of claim 1, it is characterized in that, oil injector body (1) endoporus is after installing seal ring, and cross section, its underpart will process the annular space of a right-angled triangle, so that seal ring has the space of certain compressive strain;
4. according to the described high pressure common rail electric control fuel injector sealing device of claim 1, it is characterized in that wedge-type seal circle (18) is made by filled polytetrafluoroethylene PTFE plastics;
5. according to the described high pressure common rail electric control fuel injector sealing device of claim 1, it is characterized in that the working pressure of wedge-type seal circle (18) can reach 160MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101041540A CN100412353C (en) | 2006-08-02 | 2006-08-02 | High pressure common rail electric control fuel injector sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101041540A CN100412353C (en) | 2006-08-02 | 2006-08-02 | High pressure common rail electric control fuel injector sealing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1888411A true CN1888411A (en) | 2007-01-03 |
| CN100412353C CN100412353C (en) | 2008-08-20 |
Family
ID=37577699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101041540A Expired - Fee Related CN100412353C (en) | 2006-08-02 | 2006-08-02 | High pressure common rail electric control fuel injector sealing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100412353C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101968017A (en) * | 2010-10-29 | 2011-02-09 | 郑国璋 | Low pressure difference hydraulic sealing type high-pressure common-rail fuel pump |
| CN103247409A (en) * | 2013-05-15 | 2013-08-14 | 艾通电磁技术（昆山）有限公司 | Electromagnetic pipe buckling structure |
| CN112879191A (en) * | 2021-01-15 | 2021-06-01 | 江苏大学 | Surface texture guide sealing needle valve for high-pressure oil injector |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86206671U (en) * | 1986-09-02 | 1987-07-22 | 大连工学院 | Automatic pressure-regulating heating-type injector |
| WO2002095217A1 (en) * | 2001-05-21 | 2002-11-28 | Robert Bosch Gmbh | High pressure sealing element for injectors |
| CN1312395C (en) * | 2003-12-12 | 2007-04-25 | 上海交通大学 | Sealing device for common rail Injector of diesel engine |
-
2006
- 2006-08-02 CN CNB2006101041540A patent/CN100412353C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101968017A (en) * | 2010-10-29 | 2011-02-09 | 郑国璋 | Low pressure difference hydraulic sealing type high-pressure common-rail fuel pump |
| CN101968017B (en) * | 2010-10-29 | 2012-05-02 | 郑国璋 | Low pressure difference hydraulic sealing type high-pressure common-rail fuel pump |
| CN103247409A (en) * | 2013-05-15 | 2013-08-14 | 艾通电磁技术（昆山）有限公司 | Electromagnetic pipe buckling structure |
| CN112879191A (en) * | 2021-01-15 | 2021-06-01 | 江苏大学 | Surface texture guide sealing needle valve for high-pressure oil injector |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100412353C (en) | 2008-08-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101338716B (en) | High pressure co-rail electric control fuel injector | |
| CN104018966B (en) | Pressure accumulation current-limiting type electromagnetic control oil sprayer | |
| CN101382110A (en) | Disk spring type high pressure common rail electric-controlled fuel injector | |
| CN101251068B (en) | Valve core type high pressure co-rail electric-controlled oil ejector | |
| EP1448885A1 (en) | Fluid flow rate control valve, anchor for mover and fuel injection system | |
| CN104018964A (en) | Pressure accumulation flow-limiting type piezoelectric control oil sprayer | |
| CN102213166B (en) | High-pressure common-rail electronic control oil injector | |
| CN101251067B (en) | Tappet rod type high pressure co-rail electric-controlled oil ejector | |
| CN100412353C (en) | High pressure common rail electric control fuel injector sealing device | |
| CN105952562B (en) | Combined type high-pressure common rail pump for single-cylinder diesel engine | |
| CN102213165A (en) | High pressure common rail electronic control fuel injector | |
| CN201255061Y (en) | High-voltage co-rail electric-controlled fuel injector | |
| CN105952561B (en) | Common rail pump component of high-pressure common rail pump of single-cylinder diesel engine | |
| CN111120171A (en) | Fuel injection valve assembly | |
| CN102877994A (en) | Pressure balance type inner sealing planar control valve of common-rail oil atomizer | |
| CN2641313Y (en) | Super high pressure oil pump | |
| CN101975130A (en) | Electronic control high-pressure common rail fuel injecting device | |
| CN212318196U (en) | Control valve sleeve with quick switching function | |
| CN210948963U (en) | Low-flow hysteresis proportional electromagnetic valve | |
| CN2929225Y (en) | Electromagnetic electric control diesel oil injector | |
| CN202946280U (en) | Common-rail fuel injector pressure balance type internal sealed plane control valve | |
| CN113137322A (en) | Novel high-pressure common rail oil sprayer with built-in pressure accumulation chamber | |
| CN108131230B (en) | High-pressure common rail heavy mechanical oil sprayer of diesel engine | |
| CN112761834A (en) | Oil pressure control valve of electric control unit pump | |
| CN201908727U (en) | Electric control valve actuating device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080820 Termination date: 20120802 |