CN202451331U - High-pressure common-rail fuel injector - Google Patents
High-pressure common-rail fuel injector Download PDFInfo
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- CN202451331U CN202451331U CN2011205172519U CN201120517251U CN202451331U CN 202451331 U CN202451331 U CN 202451331U CN 2011205172519 U CN2011205172519 U CN 2011205172519U CN 201120517251 U CN201120517251 U CN 201120517251U CN 202451331 U CN202451331 U CN 202451331U
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Abstract
The utility model relates to a high-pressure common-rail fuel injector. The high-pressure common-rail fuel injector is used for injecting fuel into a combustion chamber of an internal combustion engine and is particularly applicable to a high-pressure common-rail fuel system. A valve 11 is arranged between a fuel inject nozzle 19 and a control valve 7. According to the function integrated design, the valve has a fluid control function and also has a fuel injection nozzle needle valve lift control function, so that the structure of the fuel injector is simplified, high-pressure sealing surfaces are reduced, and the processing and manufacturing costs of the fuel injector are effectively reduced. The high-pressure common-rail fuel injector can completely avoid redesign of the fuel injection nozzle 19 of the conventional piezoelectric fuel injector and can realize the performance of the piezoelectric fuel injector by selecting the conventional fuel injection nozzle product.
Description
Technical field:
The invention belongs to diesel engine of vehicle fuel injection system field, be specially adapted to the diesel engine high-pressure co-rail oil sprayer.
Background technique:
Along with being on the rise of world energy sources crisis and environmental pollution, energy saving, reduction discharging have been proposed increasingly high requirement, this has also just determined diesel engine should have remarkable fuel-economy performance, satisfies the Abgasgesetz of increasingly stringent again.In the technical development of diesel engine, pay close attention to the improvement optimization of its combustion process always, this just requires fuel injection system to have superior performance.The high pressure co-rail electric control fuel injection The Application of Technology has then been brought into play enormous function in the diesel technology development; It has further reduced fuel consume, strengthened power performance has satisfied strict more Abgasgesetz simultaneously, and makes system have higher jet pressure and oil spout mode more flexibly.Therefore, be considered to a quantum jump of internal-combustion engine industry, and become the main flow of Electronic Control Ejection System of Diesel Engines, the sign of new generation of green diesel engine.The sustainable development of high-pressure common rail technology, then to its critical component---the demands for higher performance of oil sprayer: response is fast, efficient is high, cost is low.
Known that through CN1878949A a kind of oil sprayer comprises the valve similar with aforementioned type; From CN1241243A, know a kind of valve that is used for liquid control, what described liquid control valve mainly solved is the new structure design with liquid coupling chamber of hydraulic amplification.Embody the function of its fluid control, lift control in addition among the CN1878949A; Mainly be that valve plate is integrated in the oil injector body; Reduced the requirement of sealing surface, but the throttling dish at the place, hole of its fluid control is still the individual part state, does not effectively reduce the surface of contact quantity of sealing; Must select for use simultaneously the nozzle of special construction could satisfy the normal use of oil sprayer, not possess the coupling applicability between the oil nozzles with existing a large amount of uses.
Summary of the invention:
The present invention relates to a kind of high pressure common rail injector, a valve is arranged between oil nozzle 19 and the control valve 7, said valve comprises fluid control component and lift controlling component.Fluid control component comprises meter in hole 20 and meter out hole 21 and control piston 12; Described meter in hole 20 is arranged on the valve body with meter out hole 21, and control piston 12 is installed in valve 11 inside, and forms control room 23.The lift controlling component comprises pressure adjusting spring 13 and spring seat 15 and control piston 12, and described spring seat 15 is installed in valve pocket inside with pressure adjusting spring 13, and spring seat 15 directly contacts with control piston 12.Said valve has replaced the fluid control function of the used valve of conventional fuel injector and has been contained in its inner control piston 12 formation control room 23; And this valve has also constituted a gear of injector valve 18 between control piston end face 9 and injector valve 18; Limit the border of opening stroke of this injector valve 18 thus; The design of this valve has realized a plurality of function designs of part; Thereby simplified fuel injector structure, reduced cost, reduced the sealing surface that high pressure is revealed simultaneously.The compactness of control piston 12 physical dimensions design has simultaneously significantly reduced the movement parts quality, improves the oil sprayer dynamic responding speed effectively.
The present invention compares the advantage that is had with existing technology: traditional valve is only paid close attention to the control of fluid, and has adopted many parts, needs a plurality of sealing surfaces; And the present invention is the integrated design through function; Make valve not only have fluid control function; And has a function of control injector valve lift; Simplify fuel injector structure, reduced and realized that fluid is controlled, the required high pressure sealing face of lift control function, thereby effectively reduced the manufacturing cost of oil sprayer.In the existing technology; The oil nozzle that the piezoelectricity type oil sprayer is adopted must be through design again; Could satisfy the function requirement of piezoelectricity type oil sprayer; Piezoelectricity type oil sprayer of the present invention then need not through numerous and diverse oil nozzle design work, promptly can be through selecting existing common oil nozzle product for use, the performance of the piezoelectricity type oil sprayer that is shown in the realization existing technology.
Description of drawings:
Fig. 1 is a kind of high pressure common rail injector embodiment of the present invention.
Fig. 2 is a zoomed-in view among Fig. 1.
Fig. 3 is a kind of high pressure common rail injector conversion form of implementation of the present invention.
Among the figure 1, piezoelectric-actuator (electromagnetic actuator); 2, transducer piston; 3, fuel incoming pressure interface; 4, seal valve; 5, the tight cap of oil sprayer; 6, pressure spring; 7, control valve; 8, injector valve maximum lift; 9, control piston upper end; 10, valve insertion surface; 11, valve; 12, control piston; 13, pressure adjusting spring; 14, spring seat seat of honour height; 15, spring seat; 16, spring seat substructure height; 17, locating stud; 18, injector valve; 19, oil nozzle; 20, meter in hole; 21, meter out hole; 22, oil holding slot; 23, control room; 24, oil injector body; 25, transducer housing; 26, low pressure oil return oil duct; 27, valve chamber
Embodiment
Fig. 1, Fig. 2 show according to a kind of high pressure common rail injector embodiment of the present invention, and this embodiment is at accompanying drawing 1, shown in 2 and specify below, and accompanying drawing is partly expressed an embodiment of common-rail injector with vertical longitudinal section.
24 are labeled as an oil injector body that particularly is set up the common-rail injector that is used in the DENG.Piezoelectric-actuator 1, transducer piston 2, control valve 7, valve 11 and oil nozzle 19 from top to bottom are set in this oil injector body 24, and wherein oil injector body 24, control valve 7, valve 11 and oil nozzle 19 are fixed through the tight cap 5 of oil sprayer.Have one in the axial bore of transducer housing 25 and can move axially ground transducer piston 2, this transducer piston 2 is closed downwards under initial action power.Lower disposed at transducer housing 25 has a control valve 7, and it holds a seal valve 4 in an axial bore that step arranged, this valve with pressure spring 6 to the direction prestressing of closing against transducer piston 2.
Below control valve 7 and with it, settled a valve, valve 11 promptly according to the invention with being tightly connected.A main feature of this valve is; Compare with conventional valve; Valve 11 in this oil injector body has reduced by a sealing plane, and this valve not only has the fluid control function of the used valve of conventional fuel injector, has the function on the border of opening stroke that limits this injector valve 18 simultaneously.
Equally, below valve 11 and with it, settled an oil nozzle 19, both fix through locating stud 17 with being tightly connected, and fuel incoming pressure interface 3 inputs to fuel in the oil nozzle oil holding slot 22.
Piezoelectric-actuator 1 is in not alive state; Fuel incoming pressure interface 3 inputs to meter in hole 20 with the part high pressure fuel, gets into control room 23 again, makes fuel pressure act on control piston upper end 9; Push control piston 12 to direction that injector valve 18 is closed; Another part high pressure fuel inputs to injector valve oil holding slot 22, and fuel pressure acts on injector valve 18, pushes injector valve 18 to direction that injector valve 18 is opened; Because effective compression area of control piston upper end 9 is greater than effective compression area of injector valve 18, control piston 12 and injector valve 18 all are in original state of rest; When piezoelectric-actuator 1 is energized stream, it will extend and be pressed on the end face of transducer piston 2, and this pressure is delivered to seal valve 4 through transducer piston 2 and causes the pretension direction of seal valve 4 against pressure spring 6; Promptly along the closing direction of injector valve 18 and open; Make the high pressure fuel in the valve chamber 27 flow into low pressure oil return oil duct 26, lead to a fuel reserve tank that is not shown specifically again here, the fuel pressure that acts on control piston upper end 9 like this will be reduced to certain amplitude gradually; Reach the edge of satisfying control piston 12 and injector valve 18 and open the requirement of direction action; Oil sprayer begins burner oil, and after piezoelectric-actuator 1 was de-energized, piezoelectric-actuator 1 recovered initial length; Transducer piston 2 will no longer receive the pressure that piezoelectric-actuator 1 elongation is caused; The seal valve 4 pretension direction that just is in pressure spring 6 is closed like this, and control room 23 pressure recovery are to initial fuel pressure, and same because effective compression area of control piston upper end 9 is greater than effective compression area of injector valve 18; Control piston upper end 9 and injector valve 18 will be got back to initial closed state, promptly accomplish a course of injection of oil sprayer.
Fig. 3 representes a kind of high pressure common rail injector conversion form of implementation, and this control valve 7 is that with the difference of control valve shown in Figure 1 the closing direction of the seal valve 4 in the control valve shown in Fig. 37 is the closing direction along injector valve 18.Equally, 24 be labeled as an oil injector body that particularly is set up the common-rail injector that is used in the DENG.Electromagnetic actuator 1, seal valve 4, control valve 7, valve 11 and oil nozzle 19 from top to bottom are set in this oil injector body 24, and wherein oil injector body 24, control valve 7, valve 11 and oil nozzle 19 are fixed through the tight cap 5 of oil sprayer.Have one in the axial bore of control valve 7 and can move axially ground seal valve 4; When oil sprayer is in not alive state; The direction that sealing valve 4 cuts out along injector valve 18 under the initial pretightening force effect of pressure spring 6 and closing; Fuel incoming pressure interface 3 gets into high pressure fuel in the oil injector body 24 with the same manner with above-mentioned Fig. 1 explanation, and control piston 12 and injector valve 18 all are in original state of rest; When electromagnetic actuator 1 is energized stream, it will produce certain suction, make seal valve 4 open along the opening direction of injector valve 18; High pressure fuel in 23 pressure of control room flows into low pressure oil return oil duct 26; Lead to a fuel reserve tank that is not shown specifically again here, the fuel pressure that acts on control piston upper end 9 like this will be reduced to certain amplitude gradually, reach the requirement that the direction action is opened on the edge of satisfying control piston 12 and injector valve 18; Oil sprayer begins burner oil; After electromagnetic actuator 1 is de-energized, electromagnetic actuator 1 will no longer produce suction, and seal valve 4 is closed under the pretightening force effect of pressure spring 6 like this; Control room 23 pressure recovery are to the fuel incoming pressure; Same because effective compression area of 9 is greater than effective compression area of injector valve 18 on the control piston, control piston upper end 9 and injector valve 18 will be got back to initial closed state, promptly accomplish a course of injection of oil sprayer.
Shown in Fig. 1, Fig. 2; As a kind of useful structure; Fluid control of the present invention is to control through the coupling of control room 23 volume size, meter in hole 20 dimensional parameters and meter out hole 21 dimensional parameters to realize that the proportion of its meter in hole 20 flows and meter out hole 21 flows is 0.5-0.9.From accompanying drawing 1,2, know; Be in fuel in the fuel incoming pressure interface 3 through in 20 entering control rooms 23, meter in hole, the valve chamber 27 that arrives in the control valves 7 through meter out hole 21 simultaneously; After piezoelectric-actuator 1 energising action, promote transducer piston 2, the direction that seal valve 4 is closed along transducer piston 2 is opened; Make fuel oil flow into low pressure oil return oil duct 26, lead to a fuel reserve tank that is not shown specifically again here.This control room 23 reaches its maximum volume when injector valve 18 is in the closed position, injector valve 18 on the one hand the hydrodynamic pressure through having in the control room 23, be maintained at this closed position through pressure adjusting spring 13 on the other hand.The effect of input throttling is played in meter in hole 20; The effect of output throttling is played in meter out hole 21; The coupling of the volume size in both flows and control room 23 realizes the control to injector valve 18 movement rates; In actual use, the proportion of meter in hole 20 flows and meter out hole 21 flows is controlled to be 0.5-0.9.
Shown in Fig. 1, Fig. 2; As a kind of useful structure; Lift control of the present invention is through the spring seat seat of honour height 14 in the adjustment spring seat 15, realizes the control to injector valve 18 maximum lift 8, and its lift control range can reach 0.2mm-0.8mm.Can see among Fig. 1; Injector valve 18 is centered on by spring seat 15 on the end above that; These spring seat 15 upper support are on the lower end surface of control piston 12; Between the inner chamber of spring seat 15 and valve 11, cooperating a pressure adjusting spring 13, this spring applies a power to the closed position direction of injector valve 18.Control piston is in the mechanical connection through spring seat 15 and injector valve 18 simultaneously; The spring seat substructure height 16 of spring seat 15 plays the effect of control injector valve 18 cracking pressures size; The spring seat seat of honour height 14 of spring seat 15 plays the effect of control injector valve 18 maximum lift 8; In actual use, the control range of maximum lift 8 can reach 0.2mm-0.8mm.
As a kind of useful structure, the end face of control piston 12 of the present invention is arc surface or plane, and its control piston upper end 9 be spherical, with surperficial 10 surface of contact of valve insertion be arc surface; Control piston upper end 9 shapes also can be cylindrical or frustoconic shape, with valve insertion surface 10 surface of contact be the plane.For making control piston 12 not only have sliding but also have high-pressure tightness, it is that even part face cooperates with the axial bore of valve 11.
Claims (7)
1. high pressure common rail injector, it is characterized in that: between oil nozzle (19) and the control valve (7) valve is arranged, said valve comprises fluid control component and lift controlling component.
2. a kind of high pressure common rail injector according to claim 1 is characterized in that: said fluid control component comprises meter in hole (20) and meter out hole (21) and control piston (12); Meter in hole (20) and meter out hole (21) are arranged at valve (11) top, and control piston (12) is installed in valve (11) inside, and form control room (23).
3. a kind of high pressure common rail injector according to claim 1; It is characterized in that: said lift controlling component comprises pressure adjusting spring (13) and spring seat (15) and control piston (12); Spring seat (15) is installed in valve pocket inside with pressure adjusting spring (13), and spring seat (15) directly contacts with control piston (12).
4. a kind of high pressure common rail injector according to claim 1 and 2 is characterized in that: the proportion of said meter in hole (20) flow and meter out hole (21) flow is 0.5-0.9.
5. a kind of high pressure common rail injector according to claim 1 is characterized in that: the lift control range of said lift controlling component can reach 0.2mm-0.8mm.
6. a kind of high pressure common rail injector according to claim 2 is characterized in that: said control piston (12) cooperates for even part face with valve (11).
7. according to claim 2 or 3 described a kind of high pressure common rail injectors, it is characterized in that: the end face of said control piston (12) is arc surface or plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205172519U CN202451331U (en) | 2011-11-25 | 2011-11-25 | High-pressure common-rail fuel injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205172519U CN202451331U (en) | 2011-11-25 | 2011-11-25 | High-pressure common-rail fuel injector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202451331U true CN202451331U (en) | 2012-09-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205172519U Expired - Lifetime CN202451331U (en) | 2011-11-25 | 2011-11-25 | High-pressure common-rail fuel injector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202451331U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103410642A (en) * | 2013-07-02 | 2013-11-27 | 中国兵器工业集团第七0研究所 | High pressure common rail oil atomizer fuel oil injection law control body |
| CN104196665A (en) * | 2014-08-29 | 2014-12-10 | 龙口龙泵燃油喷射有限公司 | High-pressure common rail oil sprayer |
| CN104500297A (en) * | 2014-11-28 | 2015-04-08 | 重庆红江机械有限责任公司 | Energy-saving high-pressure common-rail electronic-control oil injector |
-
2011
- 2011-11-25 CN CN2011205172519U patent/CN202451331U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103410642A (en) * | 2013-07-02 | 2013-11-27 | 中国兵器工业集团第七0研究所 | High pressure common rail oil atomizer fuel oil injection law control body |
| CN104196665A (en) * | 2014-08-29 | 2014-12-10 | 龙口龙泵燃油喷射有限公司 | High-pressure common rail oil sprayer |
| CN104196665B (en) * | 2014-08-29 | 2017-06-23 | 龙口龙泵燃油喷射有限公司 | A kind of high pressure common rail injector |
| CN104500297A (en) * | 2014-11-28 | 2015-04-08 | 重庆红江机械有限责任公司 | Energy-saving high-pressure common-rail electronic-control oil injector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170718 Address after: 214063 Jiangsu city of Wuxi province Qian Rong Lu No. 15 Patentee after: China FAW Group Corporation Address before: 214063 Jiangsu city of Wuxi province Qian Rong Lu No. 15 Patentee before: Wuxi Fuel Injection Equipment Institute, China FAW Group Corporation |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120926 |