CN104728002A - High pressure common rail oil sprayer without static leakage - Google Patents
High pressure common rail oil sprayer without static leakage Download PDFInfo
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- CN104728002A CN104728002A CN201510136989.3A CN201510136989A CN104728002A CN 104728002 A CN104728002 A CN 104728002A CN 201510136989 A CN201510136989 A CN 201510136989A CN 104728002 A CN104728002 A CN 104728002A
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Abstract
Provided is a high pressure common rail oil sprayer without static leakage. An integral structure of an electromagnetic spraying control valve is changed into a split structure, the length of an upper guide section of an armature rod is reduced, the weight of the armature rod is substantially reduced, impact force generated by the armature rod in the high-speed opening and closing process is reduced, impact force of a control ball assembly to a conical surface oil hole of the top end of a valve sleeve is reduced, the speed of abrasion to a seal pair of the control ball assembly and the conical surface oil hole of the top end of the valve sleeve, and the service life of the common rail oil sprayer is prolonged. The lower end face of a valve rod is provided with a precise matching hole used for installing a guide post at the upper end of a valve needle, the sealing performance of a variable pressure cavity is guaranteed, the opening and closing response speed and use stability of the valve needle are increased, and if a damping groove is additionally formed in the guide post at the upper end of the valve needle, the opening and closing response sensitivity of the valve needle can be further improved. The service life of the common rail oil sprayer can be prolonged, the opening and closing response speed is increased, the product structure can also be simplified, manufacturability is optimized, and production cost is reduced.
Description
Technical field:
The present invention relates to diesel engine high-pressure co-rail technology, particularly relate to high pressure common rail injector.
Background technique:
Along with the progress of society, require more and more higher to energy-conservation, the reduction of discharging of diesel engine; This just proposes new requirement to Fuel Feeding System for Diesel Engine system, requires that it with Perfect Time and emitted dose more, can provide the fuel oil of more high pressure; Along with the development and improvement of diesel engine high-pressure co-rail technology, common rail system has become unique fuel oil supply system that can meet above-mentioned three aspects simultaneously and require.
Common-rail injector is the critical component of common rail system, its effect working principle controls the unlatching of high-speed electromagnetic valve with closed by ECU (Electrical Control Unit) (ECU), at regular time and quantity by high pressure fuel injection in burning chamber of diesel engine, ensure to reach in diesel engine each cylinder best oil gas combustion ratio and the good atomization of oil plant, guarantee Thorough combustion, reduce disposal of pollutants substantially.
In order to the emission standard requirement making internal-combustion engine meet state five or higher, the jet pressure of oil-fired system must be increased to more than 200MPa, meanwhile, also must ensure the anti-leak problem of fuel oil in a high voltage state, thus reduction fuel consume, realize the target of energy-saving and emission-reduction.At present, state-of-the-art high pressure co-rail system all adopts the technology without static oil return in the world, wherein the jet pressure of common-rail injector can reach more than 200MPa, adopt such technology, can realize the state five even emission standard of requirements at the higher level, but working life is short, open and close speed of response is slow, complex structure, anufacturability is poor.The fuel economy how improving engine high pressure common rail fuel combustion system is further very challenge.For existing high pressure co-rail system, extend the working life of common-rail injector, improve open and close speed of response, optimize product structure to improve technology capability, the problem of this two aspect is the technical barrier of all failing in whole industry to capture.The world-famous enterprises such as U.S.'s Bosch, Japanese foreign horse, Kubo field also fail desirable to solve above-mentioned technical barrier.
As the structural representation that Fig. 1 ~ 3 are common-rail injectors that Bosch produces, it comprises electromagnetic injection control valve 1, oil injector body 2, valve pocket 3, valve rod return spring 4, spring seat 5, valve rod 6, coupling spring 7, coupling cover 8 and hydraulic couplers 9, electromagnetic injection control valve 1 is by electromagnet 11, the very tight cap 12 of electromagnetism, electromagnet spring 13, armature lever 14, armature 15, armature return spring 16, control valve seat 17, adjusting washer (disk) 18 and control ball component 19 form, electromagnet spring 13 is arranged in the center hole of electromagnet 11, the epimere of armature lever 14 is sleeved in the endoporus of electromagnet spring 13, the upper guide section of armature lever 14 is arranged in premise clearance fit mode in the center hole of electromagnet 11, the lower guide section of armature lever 14 is sleeved in premise clearance fit mode in the center hole of armature 15 and control valve seat 17, adjusting washer (disk) 18 is arranged between armature 15 and control valve seat 17, controlling ball component 19 is arranged between the lower end of armature lever 14 and the conical surface oilhole on valve pocket 3 top, control valve seat 17 is provided with and turns to oil duct, the very tight cap 12 of electromagnetism is sleeved on electromagnet 11, the tapped hole of the very tight cap 12 of electromagnetism is screwed in the upper end of oil injector body 2, makes whole electromagnetic injection control valve 1 form on-off structure with oil injector body 2 and valve pocket 3, described hydraulic couplers 9 is by the tight cap 91 of oil nozzle, valve rod lift pad 92, oil nozzle coupling part 93, needle 94, transition block 95 and oil nozzle lift pad 96 form, oil nozzle coupling part 93 is sleeved in the center hole of the tight cap 91 of oil nozzle, needle 94 and oil nozzle lift pad 96 are all sleeved in the center hole of oil nozzle coupling part 93, and oil nozzle lift pad 96 is positioned at the top of needle 94, valve rod lift pad 96 is arranged on the top of needle 94, and be arranged in the center hole of oil nozzle lift pad 96, transition block 95 is arranged on the top of oil nozzle coupling part 93, the tight cap 91 of oil nozzle is sealed by the interior threaded hole of its upper end and the lower end outside thread of oil injector body 2 and is fastenedly connected, the lower end surface of oil injector body 2 is made to tightly suppress transition block 95, the upper-end surface of needle 94 is pushed down in the lower end surface of valve rod 6 by valve rod lift pad 92, guarantee that the lower end of needle 94 can effectively be closed the nozzle opening of oil nozzle coupling part 93 lower end and open.
Claimant finds after having carried out structural analysis and performance test to above-mentioned common-rail injector, in this common-rail injector, complex structure in electromagnetic injection control valve 1, the structural design of control valve seat 17 is unreasonable, technology capability is poor, especially oil leak hole difficulty of processing is large, the unreasonable structure of armature lever 14, the large quality of solid volume of armature lever 14 epimere is too heavy, in high frequency opening-closing process, because heavy weight armature lever 14 is at high-speed motion, its motional inertia impact force is very big, sealing pair between the fuel-displaced taper hole at the sealed bottom spheroid of armature lever 14 and valve pocket 3 top cannot be ensured working life, this is short main cause in common-rail injector working life.
In existing common-rail injector, the slow main cause of open and close speed of response is that hydraulic couplers 9 causes, in existing hydraulic couplers 9, controlling the up transformation chamber moved down of needle 94 is dock by the center hole of oil nozzle coupling part 93 upper end endoporus and transition block 95 cavity formed, the hypomere of valve rod 6 and the center hole Spielpassung of transition block 95, by plane Butt sealing between oil nozzle coupling part 93 and transition block 95, therefore in practical set and using process, the sealability difficulty or ease controlling the up transformation chamber moved down of needle 94 ensure, and poor stability, directly have influence on open and close speed of response and the stability of common-rail injector, simultaneously, the many complex structures of component part of existing hydraulic couplers 9, anufacturability is poor.
Summary of the invention:
The object of this invention is to provide a kind of high pressure common rail injector without static leakage, it effectively can solve the drawback that above-mentioned prior art exists, the working life can improving common-rail injector is short, improve open and close speed of response, product structure can also be simplified, optimize anufacturability, reduce cost of production.
The technological scheme that the present invention takes is:
Without a high pressure common rail injector for static leakage, it comprises electromagnetic injection control valve, oil injector body, valve pocket, valve rod return spring, spring seat, valve rod, coupling spring, coupling cover and hydraulic couplers, is characterized in that: described electromagnetic injection control valve is by electromagnet, the very tight cap of electromagnetism, electromagnet spring, armature lever, armature, armature return spring, pilot valve pedestal, valve pocket pressure cap, adjusting washer (disk) and control ball component composition, electromagnet spring fitting is in the center hole of electromagnet, the epimere of armature lever is sleeved in the endoporus of electromagnet spring, the upper guide section of armature lever is arranged in the center hole of electromagnet with gap fiting mode, the lower guide section of armature lever is sleeved in premise clearance fit mode in the center hole of armature and pilot valve pedestal, valve pocket pressure cap is screwed in the interior threaded hole of oil injector body upper end, push down the upper-end surface of valve pocket, controlling ball component is arranged between the lower end of armature lever and the conical surface oilhole on valve pocket top, the center of pilot valve pedestal be provided with double as oil duct polygonal in spin hole, the very tight cap sleeve of electromagnetism is contained on electromagnet, the tapped hole of the very tight cap lower end of electromagnetism is screwed on the outside thread of oil injector body upper end, at the armature lever of electromagnetic injection control valve, reliable on-off structure is formed between valve pocket and oil injector body, described hydraulic couplers is by the tight cap of oil nozzle, valve rod lift pad, oil nozzle coupling part and needle composition, oil nozzle coupling part is sleeved in the center hole of the tight cap of oil nozzle, valve needle cover is contained in the center hole of oil nozzle coupling part, valve rod lift pad is arranged on the top of needle, the tight cap of oil nozzle is sealed by the interior threaded hole of its upper end and the lower end of oil injector body and is fastenedly connected, the lower end surface of oil injector body is made to compress the upper-end surface of oil nozzle coupling part, the lower end surface of valve rod is provided with the hole of installing valve rod lift pad and needle upper end guide pillar, the upper-end surface of needle is pushed down in the lower end of valve rod by valve rod lift pad, guarantee that the lower end of needle can effectively be closed the nozzle opening of oil nozzle coupling part lower end and open.
Further, in the polygonal of described pilot valve pedestal, spin hole is spin hole in regular polygon.
Further, in the regular polygon of described pilot valve pedestal, spin hole is spin hole in more than square.
Further, in the regular polygon of described pilot valve pedestal, spin hole is spin hole in regular hexagon.
Further, needle upper end guide pillar is provided with subtracts damping slot.
Again improve owing to having carried out structure to the electromagnetic injection control valve in high pressure common rail injector, control valve seat is changed into Split type structure by monolithic construction, control valve seat by monolithic construction makes pilot valve pedestal and valve pocket pressure cap into, pilot valve pedestal end face is provided with spill port, the cylindrical of valve pocket pressure cap is provided with outside thread, endoporus is polygonly tighten hole, by valve pocket pressure cap, axial compression is carried out to valve pocket, the elastic force of armature return spring is determined to adjust by the thickness of adjusting washer (disk) and is regulated, the endoporus of valve pocket pressure cap doubles as back oil road, the endoporus that pilot valve pedestal end face is provided with spill port and valve pocket pressure cap interlinks, the upper guide section of armature lever is designed to the lower end limited step of electromagnet spring, reduce the length of guide section, so just can alleviate the weight of armature lever to greatest extent, significantly reduce the impact force that armature lever produces in high-speed opening and closing process, thus reduce control ball component to the conical surface oilhole impact force on valve pocket top, delay the rate of wear of both sealing pairs, improve the working life of common-rail injector, optimize the process structure of control valve seat further simultaneously, both processing had been convenient to, cost of production can be reduced again.
Improvement has been done to valve rod lower end and hydraulic couplers cooperating structure, up for the existing control needle transformation chamber moved down is made into overall structure by splicing construction, because existing transformation chamber docks by the center hole of oil nozzle coupling part upper end endoporus and transition block the cavity formed, the hypomere of valve rod and the center hole Spielpassung of transition block, by plane Butt sealing between oil nozzle coupling part and transition block, therefore in practical set and using process, the sealability difficulty or ease in transformation chamber ensure, and poor stability, directly have influence on open and close speed of response and the stability of common-rail injector, this programme is provided with the precision-fit hole of installing valve rod lift pad and needle upper end guide pillar on the lower end surface of valve rod, improve the sealability in the transformation chamber formed between the precision-fit hole of valve rod lower end and the upper end guide pillar of needle, thus improve speed of response and the stability in use of needle keying, if set up on the guide pillar of needle upper end and subtract damping slot, then can improve the response sensitivity that needle opens and closes further, therefore this hydraulic couplers solves the technical barrier existed in prior art very goodly, simultaneously, also reduce the component part quantity of hydraulic couplers, top grade manufacturing process, cost of production can be reduced further, improve and assemble once conjunction rate.
Accompanying drawing illustrates:
Fig. 1 is the structural representation of existing common-rail injector;
Fig. 2 is the structural representation of electromagnetic injection control valve in Fig. 1;
Fig. 3 is the structural representation of hydraulic couplers in Fig. 1;
Fig. 4 is structural representation of the present invention;
Fig. 5 is the structural representation of electromagnetic injection control valve in Fig. 4;
Fig. 6 is the structural representation of hydraulic couplers in Fig. 4;
In figure: 1-electromagnetic injection control valve; 2-oil injector body; 3-valve pocket; 4-valve rod return spring; 5-spring seat; 6-valve rod; 7-coupling spring; 8-coupling cover; 9-hydraulic couplers; 11-electromagnet; The very tight cap of 12-electromagnetism; 13-electromagnet spring; 14-armature lever; 15-armature; 16-armature return spring; 17-control valve seat; 17a-pilot valve pedestal; 17b-valve pocket pressure cap; 18-adjusting washer (disk); 19-controls ball component; The tight cap of 91-oil nozzle; 92-valve rod lift pad; 93-oil nozzle coupling part; 94-needle; 95-transition block; 96-oil nozzle lift pad; 97-subtracts damping slot.
Embodiment:
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described:
Embodiment 1: a kind of high pressure common rail injector without static leakage, and as shown in Fig. 4 ~ Fig. 6, it comprises electromagnetic injection control valve 1, oil injector body 2, valve pocket 3, valve rod return spring 4, spring seat 5, valve rod 6, coupling spring 7, coupling cover 8 and hydraulic couplers 9, described electromagnetic injection control valve 1 is by electromagnet 11, the very tight cap 12 of electromagnetism, electromagnet spring 13, armature lever 14, armature 15, armature return spring 16, pilot valve pedestal 17a, valve pocket pressure cap 17b, adjusting washer (disk) 18 and control ball component 19 form, electromagnet spring 13 is arranged in the center hole of electromagnet 11, the epimere of armature lever 14 is sleeved in the endoporus of electromagnet spring 13, the upper guide section of armature lever 14 is arranged on gap fiting mode in the center hole of electromagnet 11, the lower guide section of armature lever 14 is sleeved in premise clearance fit mode in the center hole of armature 15 and pilot valve pedestal 17a, valve pocket pressure cap 17b is screwed in the interior threaded hole of oil injector body 2 upper end, push down the upper-end surface of valve pocket 3, controlling ball component 19 is arranged between the lower end of armature lever 14 and the conical surface oilhole on valve pocket 3 top, the center of pilot valve pedestal 17a be provided with double as oil duct regular hexagon in spin hole, the very tight cap 12 of electromagnetism is sleeved on electromagnet 11, the tapped hole of electromagnetism very tight cap 12 lower end is screwed on the outside thread of oil injector body 2 upper end, at the armature lever 14 of electromagnetic injection control valve 1, reliable on-off structure is formed between valve pocket 3 and oil injector body 2, described hydraulic couplers 9 is by the tight cap 91 of oil nozzle, valve rod lift pad 92, oil nozzle coupling part 93 and needle 94 form, oil nozzle coupling part 93 is sleeved in the center hole of the tight cap 91 of oil nozzle, needle 94 is sleeved in the center hole of oil nozzle coupling part 93, valve rod lift pad 92 is arranged on the top of needle 94, the tight cap 91 of oil nozzle is sealed by the interior threaded hole of its upper end and the lower end of oil injector body 2 and is fastenedly connected, the lower end surface of oil injector body 2 is made to compress the upper-end surface of oil nozzle coupling part 93, the lower end surface of valve rod 6 is provided with the hole of installing valve rod lift pad 92 and needle 94 upper end guide pillar, the upper-end surface of needle 94 is pushed down in the lower end of valve rod 6 by valve rod lift pad 92, guarantee that the lower end of needle 94 can effectively be closed the nozzle opening of oil nozzle coupling part 93 lower end and open.
Claims (5)
1. the high pressure common rail injector without static leakage, it comprises electromagnetic injection control valve (1), oil injector body (2), valve pocket (3), valve rod return spring (4), spring seat (5), valve rod (6), coupling spring (7), coupling cover (8) and hydraulic couplers (9), it is characterized in that: described electromagnetic injection control valve (1) is by electromagnet (11), the very tight cap of electromagnetism (12), electromagnet spring (13), armature lever (14), armature (15), armature return spring (16), pilot valve pedestal (17a), valve pocket pressure cap (17b), adjusting washer (disk) (18) and control ball component (19) composition, electromagnet spring (13) is arranged in the center hole of electromagnet (11), the epimere of armature lever (14) is sleeved in the endoporus of electromagnet spring (13), the upper guide section of armature lever (14) is arranged on gap fiting mode in the center hole of electromagnet (11), the lower guide section of armature lever (14) is sleeved in premise clearance fit mode in the center hole of armature (15) and pilot valve pedestal (17a), valve pocket pressure cap (17b) is screwed in the interior threaded hole of oil injector body (2) upper end, push down the upper-end surface of valve pocket (3), controlling ball component (19) is arranged between the lower end of armature lever (14) and the conical surface oilhole on valve pocket (3) top, the center of pilot valve pedestal (17a) be provided with double as oil duct polygonal in spin hole, the very tight cap of electromagnetism (12) is sleeved on electromagnet (11), the tapped hole of the very tight cap of electromagnetism (12) lower end is screwed on the outside thread of oil injector body (2) upper end, at the armature lever (14) of electromagnetic injection control valve (1), reliable on-off structure is formed between valve pocket (3) and oil injector body (2), described hydraulic couplers (9) is by the tight cap of oil nozzle (91), valve rod lift pad (92), oil nozzle coupling part (93) and needle (94) composition, oil nozzle coupling part (93) is sleeved in the center hole of the tight cap of oil nozzle (91), needle (94) is sleeved in the center hole of oil nozzle coupling part (93), valve rod lift pad (92) is arranged on the top of needle (94), the tight cap of oil nozzle (91) is sealed by the interior threaded hole of its upper end and the lower end of oil injector body (2) and is fastenedly connected, the lower end surface of oil injector body (2) is made to compress the upper-end surface of oil nozzle coupling part (93), the lower end surface of valve rod (6) is provided with the hole of installing valve rod lift pad (92) and needle (94) upper end guide pillar, the upper-end surface of needle (94) is pushed down in the lower end of valve rod (6) by valve rod lift pad (92), guarantee that the lower end of needle (94) can effectively be closed the nozzle opening of oil nozzle coupling part (93) lower end and open.
2. according to claim 1 without the high pressure common rail injector of static leakage, it is characterized in that: in the polygonal of described pilot valve pedestal (17a), spin hole is spin hole in regular polygon.
3. according to claim 2 without the high pressure common rail injector of static leakage, it is characterized in that: in the regular polygon of described pilot valve pedestal (17a), spin hole is spin hole in more than square.
4. according to claim 3 without the high pressure common rail injector of static leakage, it is characterized in that: in the regular polygon of described pilot valve pedestal (17a), spin hole is spin hole in regular hexagon.
5. according to claim 1 without the high pressure common rail injector of static leakage, it is characterized in that: be provided with on the guide pillar of needle (94) upper end and subtract damping slot (97).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510136989.3A CN104728002A (en) | 2015-03-26 | 2015-03-26 | High pressure common rail oil sprayer without static leakage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510136989.3A CN104728002A (en) | 2015-03-26 | 2015-03-26 | High pressure common rail oil sprayer without static leakage |
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| CN104728002A true CN104728002A (en) | 2015-06-24 |
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| CN201510136989.3A Pending CN104728002A (en) | 2015-03-26 | 2015-03-26 | High pressure common rail oil sprayer without static leakage |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109751168A (en) * | 2019-03-11 | 2019-05-14 | 无锡格林鲍尔科技有限公司 | A kind of high power density high pressure common rail injector |
| CN109869251A (en) * | 2019-02-28 | 2019-06-11 | 一汽解放汽车有限公司 | A kind of coupling fluid-structure fuel injector |
| CN110131084A (en) * | 2019-06-03 | 2019-08-16 | 无锡格林鲍尔科技有限公司 | A kind of valve rod couple high pressure common rail injector |
| CN111878275A (en) * | 2020-07-29 | 2020-11-03 | 一汽解放汽车有限公司 | Device for electrically-controlled oil injection and oil injector |
| CN113530736A (en) * | 2021-08-02 | 2021-10-22 | 钧风电控科技(泰州)有限责任公司 | Valve rod assembly with coupling cavity |
| CN113757016A (en) * | 2021-08-19 | 2021-12-07 | 北油电控燃油喷射系统(天津)有限公司 | Pressure regulating spring overhead type oil sprayer |
| CN114483383A (en) * | 2022-01-28 | 2022-05-13 | 刘义亭 | Gas fuel injector |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111878275A (en) * | 2020-07-29 | 2020-11-03 | 一汽解放汽车有限公司 | Device for electrically-controlled oil injection and oil injector |
| CN111878275B (en) * | 2020-07-29 | 2022-02-11 | 一汽解放汽车有限公司 | Device for electrically-controlled oil injection and oil injector |
| CN113530736A (en) * | 2021-08-02 | 2021-10-22 | 钧风电控科技(泰州)有限责任公司 | Valve rod assembly with coupling cavity |
| CN113757016A (en) * | 2021-08-19 | 2021-12-07 | 北油电控燃油喷射系统(天津)有限公司 | Pressure regulating spring overhead type oil sprayer |
| CN114483383A (en) * | 2022-01-28 | 2022-05-13 | 刘义亭 | Gas fuel injector |
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