CN202148954U - Fuel oil high-pressure constant-pressure injection system of diesel engine - Google Patents
Fuel oil high-pressure constant-pressure injection system of diesel engine Download PDFInfo
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- CN202148954U CN202148954U CN201120228731U CN201120228731U CN202148954U CN 202148954 U CN202148954 U CN 202148954U CN 201120228731 U CN201120228731 U CN 201120228731U CN 201120228731 U CN201120228731 U CN 201120228731U CN 202148954 U CN202148954 U CN 202148954U
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Abstract
The utility model discloses a fuel oil high-pressure constant-pressure injection system of a diesel engine, which comprises a hydraulic pump and cylinder assemblies. The hydraulic pump is connected to a high-pressure oil header pipe in a matched mode. The high-pressure oil header pipe is communicated with the cylinder assembly of each cylinder through an oil inlet branch pipe, a high-speed magnetic exchange valve and an oil inlet and return branch pipe. An oil return port of the high-speed magnetic exchange valve is connected to an oil return header pipe through an oil return branch pipe. The magnetic exchange valve is connected to an exchange control unit (ECU) controller capable of controlling the magnetic exchange valve to work. Each cylinder assembly comprises a hydraulic cylinder body, a cylinder baseboard, a cylinder cover body, a hydraulic piston and a pressure spring. High-pressure oil compresses the pressure spring through the hydraulic piston, the ECU controller controls the magnetic exchange valve to change the oil inlet and return position in signal mode, the pressure spring is led to be bounced to push the hydraulic piston to ascend, and a plunger piston of a high-pressure oil pump is then pushed through a piston ejector rod to inject fuel oil. The fuel oil high-pressure constant-pressure injection system of the diesel engine adopts the spring to achieve control over a fuel oil injection pump, ensures that the diesel engine keeps constant pressure under any working condition, enables fuel oil atomization to keep stable, accordingly enables the fuel oil atomization to be perfect and enables burning to be more sufficient.
Description
Technical field
The present invention relates to the technical field that the internal-combustion engine intermediate fuel oil sprays, particularly a kind of diesel engine fuel oil high pressure constant pressure injection system.
Background technique
The fuel injection system of diesel engine, generally adopt four kinds of structures: 1, adopt cam ejection pin mechanism, promptly through the rotation of cam, the roller that promotes push rod drives push rod and moves up and down, and makes the high pressure oil pump injected fuel; 2, adopt high-pressure common-rail injection system, be about to fuel oil and produce high pressure through high pressure oil pump, get into the high pressure fuel house steward, high pressure fuel sprays through high-speed electromagnetic valve control.3. electric injection system, the magnetic force that promptly adopts electromagnet to produce promotes the plunger injected fuel of high pressure oil pump; 4. adopt the high back voltage Common rail fuel injection system, promptly adopt high pressure oil to promote hydraulic cylinder piston, promote the purpose that the high pressure oil pump plunger reaches the oil spout of high pressure level pressure.
With regard to present employed situation; Adopt the structure of cam ejection pin mechanism mainly to have following shortcoming: 1, the roller of cam follower belongs to the line contact; Owing to receive the restriction of metal surface bearing capacity; The raising speed of roller can not be too big, thereby make the jet velocity of high pressure oil pump and injection fuel rate be difficult to improve.When the diesel engine low cruise, the jet velocity and the injection fuel rate of high pressure oil pump further reduce especially, and fuel atomization effect worsens, and produce a large amount of carbon deposits at piston and firing chamber, cause cylinder sleeve sharply to wear and tear.Owing to atomization badness, fuel consumption rate sharply increases simultaneously, and NOx and particulate emission roll up, and environment is polluted.2, the cam post rod type ejecting system belongs to mechanical structure, in various operating mode following time, is difficult to change the oil spout angle, can only adopt unified injection timing, can not make diesel engine optimum operation under various operating modes and rotating speed;
Adopt the structure of high-pressure common-rail injection system; Just use condition does not also have maturation at present; Owing to receive the restriction of pressure that solenoid directional control valve bears and sealing, can't fuel pressure be brought up to more than the 180MPa, that is to say; The injection starting pressure of oil sprayer also is difficult to reach 60MPa, and the atomizing of fuel oil is not further improved; High-pressure common-rail injection system is difficult to heavy oil combustion on middle high speed diesel engine.The circulatory system of heavy oil is: high-pressure service pump-fuel oil oil-feed house steward-fuel oil injectionpump-heating unit-high-pressure service pump; This circulatory system is exactly in order to guarantee the temperature constant of heavy oil; To guarantee that furol viscosity is no more than requirement, for 7000 seconds heavy oil, heating-up temperature required to reach more than 140 ℃.The pressurization because heavy oil need circulate will consume too much energy, and high pressure co-rail system can't be used on the middle high speed diesel engine at present.
Electric injection system is that diesel engine for automobile adopts more a kind of ejecting system, and use is also arranged on medium speed diesel.But electric injection system is to adopt the magnetic force of electromagnet to promote plunger, and when improving jet pressure, the volume that electromagnet must be done is very big, and receives the restriction of power, the difficult jet pressure that further improves.
The reverse common rail fuel injection system adopts hydraulic oil to promote hydraulic cylinder piston, because the flowability of hydraulic oil is applicable to medium speed diesel.But for high speed machine, the requirement that hydraulic oil oil-feed speed does not reach injection rate, atomization badness in the time of can making fuel injection.
Summary of the invention
Technical problem to be solved by this invention is to above-mentioned existing technology present situation, provides to have that oil consumption is lower, operation safe is easy and pressure stability, reliable performance and open oil spout and press high a kind of diesel engine fuel oil high pressure constant pressure injection system.
The present invention solves the problems of the technologies described above the technological scheme that is adopted: diesel engine fuel oil high pressure constant pressure injection system; This system comprises run up oil hydraulic pump that produces high pressure oil and the cylinder component that can control the work of diesel engine fuel oil oil sprayer; The oil hydraulic pump output terminal has connected the high pressure oil house steward; Wherein: all be connected between the cylinder component of high pressure oil house steward and every cylinder through oil-feed arm, high speed electromagnetic selector valve and oil inlet and oil return arm; The return opening of high speed electromagnetic selector valve is connected with the oil return house steward through oil returning branch pipe, and high speed electromagnetic selector valve circuit is connected with the ECU controller that can control its switching-over work; Cylinder component comprises and is fixedly mounted on hydraulic cylinder up and down cylinder bottom plate, cylinder body, hydraulic piston and the pressure spring at two ends respectively; Hydraulic piston is installed in the hydraulic cylinder inner chamber, and the push rod of hydraulic piston stretches out in outside the cylinder body, and pressure spring is fitted in the rodless cavity of hydraulic cylinder and with the hydraulic piston roof pressure and matches, and the oil inlet and oil return arm is connected with the rod chamber of hydraulic cylinder; High pressure oil is through hydraulic piston compression pressure spring energy-storage, and ECU controller signals control high speed electromagnetic selector valve changes the oil inlet and oil return position, pressure spring is upspring promote hydraulic piston up, through piston mandril and then promote the plunger injected fuel of high pressure oil pump.
For optimizing technique scheme, the concrete measure of taking also comprises:
Above-mentioned oil hydraulic pump is by the high-pressure plunger oil hydraulic pump of crankshaft free-end gear drive or power post piston hydraulic pump.
Above-mentioned cylinder bottom plate closely is connected with hydraulic cylinder through screw, and the cylinder bottom plate is shaped on the central through bore that is communicated with rodless cavity.
Above-mentioned pressure spring is dish combination spring or cylindrical compression spring, and the pressure of pressure spring is suitable with the jet pressure of the high pressure oil pump plunger that sets.
Above-mentioned hydraulic piston comprises piston plate and push rod, is shaped on annular groove on the side face of piston plate, is embedded with piston packing in the annular groove.
Above-mentioned cylinder body is shaped on the inside connecting passage that is communicated with rod chamber, and the oil inlet and oil return arm is connected with the rod chamber of hydraulic cylinder through inner connecting passage, and cylinder body is fitted with the push rod seal ring that cooperates with hydraulic piston push rod liquid sealing.
Above-mentioned piston plate upper surface is shaped on the annular convex shoulder that raises up, and correspondingly the lower surface of cylinder body is shaped on the circular groove that is complementary with annular convex shoulder.
Above-mentioned high pressure oil house steward's end is equipped with the accumulator of ability balance high pressure oil house steward inner high voltage oil pressure.
Compared with prior art, the present invention adopts by the high-pressure plunger pump of crankshaft free-end gear drive or electronic high-pressure plunger pump high pressure liquid oil is provided, and every cylinder hydraulic jack assembly all is fitted with the high speed electromagnetic selector valve; The high speed electromagnetic selector valve is connected with the ECU controller that can control this high speed electromagnetic selector valve work, after the hydraulic pressure high pressure oil gets into hydraulic cylinder, through the Piston Compression pressure spring; When diesel engine runs to the oil spout angle; The action of ECU controller signals control high speed electromagnetic selector valve makes solenoid valve be in the oil return position, and pressure spring is upspring, and to promote hydraulic piston up; Through the push rod on the hydraulic piston, promote the plunger oil spout of high pressure oil pump.The present invention is through the control of ECU controller; Can change injection advance angle automatically according to rotating speed, the payload of diesel engine, it adopts spring to realize fuel oil injectionpump is controlled; This spray regime; Guaranteed that diesel engine fuel injecting can keep constant compression force under any operating mode, and can increase substantially jet pressure, made fuel-oil atmozation keep stable.The oil sprayer injection starting pressure significantly improves, and maximum can be brought up to 320MPa, much larger than the pressure of high-pressure common rail.Thereby make fuel-oil atmozation more perfect, it is more abundant to burn.Through the ECU controller, can reach diesel engine and can both accomplish perfect coupling according to diesel engine different rotating speed and changing load injection timing at various rotating speeds and load.
Description of drawings
Fig. 1 is the application schematic representation of embodiments of the invention;
Fig. 2 is the structural representation of cylinder component among Fig. 1;
Fig. 3 is that the assembling of Fig. 1 high speed solenoid directional control valve connects schematic representation;
Fig. 4 is the structural representation of hydraulic piston among Fig. 2.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are described in further detail.
Fig. 1 is extremely shown in Figure 4 to be structural representation of the present invention.
Reference character wherein is: oil hydraulic pump 1; High pressure oil house steward 2; Accumulator 21; Oil-feed arm 3; High speed electromagnetic selector valve 4; Oil inlet and oil return arm 5; Cylinder component 6; Hydraulic cylinder 61; Cylinder bottom plate 62; Central through bore 62a; Cylinder body 63; Inner connecting passage 63a; Circular groove 631; Hydraulic piston 64; Piston plate 641; Annular groove 642; Piston packing 643; Annular convex shoulder 644; Push rod 645; Push rod seal ring 646; Pressure spring 65; Oil returning branch pipe 7; Oil return house steward 8; ECU controller 9.
Extremely shown in Figure 4 like Fig. 1; Diesel engine fuel oil high pressure constant pressure injection of the present invention system; This system comprises run up oil hydraulic pump 1 that produces high pressure oil and the cylinder component 6 that can control the work of diesel engine fuel oil oil sprayer; Oil hydraulic pump 1 output terminal has connected high pressure oil house steward 2; All be connected through oil-feed arm 3, high speed electromagnetic selector valve 4 and oil inlet and oil return arm 5 between the cylinder component 6 of high pressure oil house steward 2 and every cylinder, the return opening of high speed electromagnetic selector valve 4 is connected with oil return house steward 8 through oil returning branch pipe 7, and high speed electromagnetic selector valve 4 circuit are connected with the ECU controller 9 that can control its switching-over work; Cylinder component 6 comprises cylinder bottom plate 62, cylinder body 63, hydraulic piston 64 and the pressure spring 65 that is fixedly mounted on hydraulic cylinder two ends about in the of 61 respectively; Hydraulic piston 64 is installed in hydraulic cylinder 61 inner chambers; And the push rod 645 of hydraulic piston 64 stretches out in outside the cylinder body 63; Pressure spring 65 is fitted in the rodless cavity of hydraulic cylinder 61 and with hydraulic piston 64 roof pressures and matches, and oil inlet and oil return arm 5 is connected with the rod chamber of hydraulic cylinder 61; High pressure oil is through 65 accumulation of energys of hydraulic piston 64 compression pressure springs; ECU controller 9 SC sigmal control high speed electromagnetic selector valves 4 change the oil inlet and oil return position; Pressure spring 65 is upspring promote hydraulic piston 64 up, through piston mandril 645 and then promote the plunger injected fuel of high pressure oil pump.Working principle of the present invention is: the high-pressure and hydraulic oil of oil hydraulic pump 1 output that runs up gets in the high pressure oil house steward 2; ECU controller 9 control turnover innage speed solenoid directional control valves 4 are in the oil-feed position; High pressure oil is through high pressure oil-feed arm 3 and high speed electromagnetic selector valve 4, and through in the rod chamber in the oil inlet and oil return arm 5 entering hydraulic cylinders 61, the hydraulic pressure high pressure oil is through hydraulic piston 64 compression pressure springs 65 again; Make the plunger of high-pressure fuel pump of diesel engine descending, fuel oil gets into the fuel injection chamber of high pressure oil pump.When diesel engine runs to the oil spout angle; 4 actions of ECU controller 9 control high speed electromagnetic selector valves make high speed electromagnetic selector valve 4 be in the oil return position, and the hydraulic oil in the hydraulic cylinder is got back to oil return house steward 8 through oil inlet and oil return arm 5, high speed electromagnetic selector valve 4, oil returning branch pipe 7; Pressure spring 65 is upspring simultaneously; It is up to promote hydraulic piston 64, through the push rod on the hydraulic piston 64 645, promotes the plunger injected fuel of high pressure oil pump.
Compare with the fuel injection system of existing diesel, the present invention adopts the action of ECU controller control electromagnetic valve, can be according to the rotating speed and the load condition of diesel engine; Automatically adjust injection timing; Make diesel engine can satisfy various working condition requirements, and adopt spring to spray, jet velocity is accelerated; Reach the moment injection, improve injection fuel rate; Moreover, can make jet pressure reach 300Mpa according to the requirement of diesel engine performance because the hydraulic piston area much larger than the sectional area of plunger of high pressure oil pump, can make jet pressure greatly improve.Adopt the spring spray regime in addition, can also make diesel engine in a work cycle, the most of the time is in the oil-feed state, has avoided the inadequate defective of hydraulic oil oil-feed.The present invention can effectively reduce fuel consumption rate, and the effect that particularly when partial load condition, reduces is more obvious.Because what adopt is hydraulic power structure, makes fuel injection system work safer, reliable, reduce the NOx discharging, make system reach the emission standard of IMO Europe II.
In order to obtain better technique effect:
High-pressure plunger oil hydraulic pump or power post piston hydraulic pump that oil hydraulic pump 1 of the present invention adopts by the crankshaft free-end gear drive.
Among the embodiment, as shown in Figure 2, the cylinder bottom plate 62 of hydraulic jack closely is connected with hydraulic cylinder 61 through screw, and cylinder bottom plate 62 is shaped on the central through bore 62a that is communicated with rodless cavity.It is to be used for flowing out the hydraulic oil that hydraulic piston 64 leaks in the rodless cavity that back-plane design has the main effect of central through bore 62a, and the hydraulic oil of anti-heads hinders piston stroke.
As shown in Figure 4, hydraulic piston 64 comprises piston plate 641 and piston mandril 645, is shaped on annular groove 642 on the side face of piston plate 641, in order to be embedded with piston packing 643 in the liquid sealing property annular groove 642 that guarantees hydraulic piston 64 and hydraulic cylinder 61 inwalls.
For further optimization, the technical measures that adopted also comprise: piston plate 641 upper surfaces are shaped on the annular convex shoulder 644 that raises up, and correspondingly the lower surface of cylinder body 63 is shaped on the circular groove 631 that is complementary with annular convex shoulder 644.Being designed with annular convex shoulder 644 is when hydraulic piston 64 fast uplinks with circular groove 631 its advantages; The annular convex shoulder 644 of piston gets in the circular groove 631, forms hydraulic pressure cavity, annular convex shoulder 644 extruding hydraulic oil; Hydraulic oil is flowed out in the gap of annular convex shoulder 644 and circular groove 631 peripheries; Can play damping function, prevent that hydraulic piston and cylinder body from directly clashing into, cause hydraulic cylinder to damage.
High pressure oil house steward's 2 of the present invention end also sets the accumulator 21 that is connected with ability balance high pressure oil house steward 2 inner high voltage oil pressures.When the oil-feed of hydraulic jack assembly, accumulator 21 can replenish the deficiency of high-pressure plunger pump duty, plays the pressure effect in the equalizing main.
High speed electromagnetic selector valve 4 of the present invention is controlled by ECU controller 9; The oil-feed or the oil return action of high speed electromagnetic selector valve 4 accomplished in 9 controls of ECU controller, also controls the oil-feed time of high speed electromagnetic selector valve 4 and the corner of oil return time and oil return time and bent axle simultaneously.The injection duration of fuel oil is generally 20～30 ° of crank angles by the pressure spring frequency setting, and the oil return time of solenoid valve is a bit larger tham fuel injection time, is beneficial to the normal injection of fuel oil.Remaining 690～700 ° of crank angles are in order to the oil hydraulic cylinder oil-feed.This design can guarantee the abundant oil-feed of hydraulic jack.
The invention has the advantages that: adopt spring to realize fuel oil injectionpump is controlled, guaranteed that diesel engine fuel injecting can keep constant compression force under any operating mode, make fuel-oil atmozation keep stable; The oil sprayer injection starting pressure significantly improves, thereby makes fuel-oil atmozation more perfect, and it is more abundant to burn; Through the ECU controller, realize the accuracy of hydraulic pressure switching-over, and can reach diesel engine and can both accomplish perfect coupling according to diesel engine different rotating speed and changing load injection timing at various rotating speeds and load.
Most preferred embodiment of the present invention is illustrated, and various variations or the remodeling made by those of ordinary skills can not depart from the scope of the present invention.
Claims (8)
1. diesel engine fuel oil high pressure constant pressure injection system; Comprise run up oil hydraulic pump (1) that produces high pressure oil and the cylinder component (6) that can control the work of diesel engine fuel oil oil sprayer; Said oil hydraulic pump (1) output terminal has connected high pressure oil house steward (2); It is characterized in that: all be connected between the cylinder component (6) of described high pressure oil house steward (2) and every cylinder through oil-feed arm (3), high speed electromagnetic selector valve (4) and oil inlet and oil return arm (5); The return opening of said high speed electromagnetic selector valve (4) is connected with oil return house steward (8) through oil returning branch pipe (7), and high speed electromagnetic selector valve (4) circuit is connected with the ECU controller (9) that can control its switching-over work; Said cylinder component (6) comprises and is fixedly mounted on hydraulic cylinder (61) cylinder bottom plate (62), cylinder body (63), hydraulic piston (64) and the pressure spring (65) at two ends up and down respectively; Said hydraulic piston (64) is installed in hydraulic cylinder (61) inner chamber; And the push rod (645) of hydraulic piston (64) stretches out in outside the cylinder body (63); Said pressure spring (65) is fitted in the rodless cavity of hydraulic cylinder (61) and with hydraulic piston (64) roof pressure and matches, and said oil inlet and oil return arm (5) is connected with the rod chamber of hydraulic cylinder (61); High pressure oil is through hydraulic piston (64) compression pressure spring (65) accumulation of energy; Said ECU controller (9) SC sigmal control high speed electromagnetic selector valve (4) changes the oil inlet and oil return position; Pressure spring (65) is upspring promote hydraulic piston (64) up, through piston mandril (645) and then promote the plunger injected fuel of high pressure oil pump.
2. diesel engine fuel oil high pressure constant pressure injection according to claim 1 system is characterized in that: described oil hydraulic pump is high-pressure plunger oil hydraulic pump or power post piston hydraulic pump by the crankshaft free-end gear drive.
3. diesel engine fuel oil high pressure constant pressure injection according to claim 2 system, it is characterized in that: described cylinder bottom plate (62) closely is connected with hydraulic cylinder (61) through screw, and cylinder bottom plate (62) is shaped on the central through bore (62a) that is communicated with rodless cavity.
4. diesel engine fuel oil high pressure constant pressure injection according to claim 3 system is characterized in that: described pressure spring (65) is dish combination spring or cylindrical compression spring, and the pressure of pressure spring is suitable with the jet pressure of the high pressure oil pump plunger that sets.
5. diesel engine fuel oil high pressure constant pressure injection according to claim 4 system; It is characterized in that: described hydraulic piston (64) comprises piston plate (641) and push rod (645); Be shaped on annular groove (642) on the side face of said piston plate (641), be embedded with piston packing (643) in the annular groove (642).
6. diesel engine fuel oil high pressure constant pressure injection according to claim 5 system; It is characterized in that: described cylinder body (63) is shaped on the inside connecting passage (63a) that is communicated with rod chamber; Said oil inlet and oil return arm (5) is connected through the rod chamber of inner connecting passage (63a) with hydraulic cylinder (61), and cylinder body (63) is fitted with the push rod seal ring (646) that cooperates with hydraulic piston push rod (645) liquid sealing.
7. diesel engine fuel oil high pressure constant pressure injection according to claim 6 system; It is characterized in that: described piston plate (641) upper surface is shaped on the annular convex shoulder (644) that raises up, and the lower surface of correspondingly said cylinder body (63) is shaped on the circular groove (631) that is complementary with annular convex shoulder (644).
8. diesel engine fuel oil high pressure constant pressure injection according to claim 7 system is characterized in that: described high pressure oil house steward's (2) end be equipped with can balance high pressure oil house steward (2) inner high voltage oil pressure accumulator (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120228731U CN202148954U (en) | 2011-06-30 | 2011-06-30 | Fuel oil high-pressure constant-pressure injection system of diesel engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120228731U CN202148954U (en) | 2011-06-30 | 2011-06-30 | Fuel oil high-pressure constant-pressure injection system of diesel engine |
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| CN202148954U true CN202148954U (en) | 2012-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201120228731U Expired - Lifetime CN202148954U (en) | 2011-06-30 | 2011-06-30 | Fuel oil high-pressure constant-pressure injection system of diesel engine |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102287270A (en) * | 2011-06-30 | 2011-12-21 | 徐玉国 | Constant high pressure injection system for diesel fuel |
| CN102996260A (en) * | 2011-09-08 | 2013-03-27 | 瓦锡兰瑞士公司 | Fuel injection system for internal combustion engine, method for injecting fuel, as well as internal combustion engine |
| CN103244328A (en) * | 2012-06-20 | 2013-08-14 | 南京威孚金宁有限公司 | Pressure-regulating timing advancing device |
| CN103256125A (en) * | 2013-05-02 | 2013-08-21 | 浙江大学 | System for hydraulic compression control over combustion of homogeneous gas mixture of internal-combustion engine |
-
2011
- 2011-06-30 CN CN201120228731U patent/CN202148954U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102287270A (en) * | 2011-06-30 | 2011-12-21 | 徐玉国 | Constant high pressure injection system for diesel fuel |
| CN102996260A (en) * | 2011-09-08 | 2013-03-27 | 瓦锡兰瑞士公司 | Fuel injection system for internal combustion engine, method for injecting fuel, as well as internal combustion engine |
| CN103244328A (en) * | 2012-06-20 | 2013-08-14 | 南京威孚金宁有限公司 | Pressure-regulating timing advancing device |
| CN103244328B (en) * | 2012-06-20 | 2016-06-08 | 南京威孚金宁有限公司 | Pressure regulation timing advancer |
| CN103256125A (en) * | 2013-05-02 | 2013-08-21 | 浙江大学 | System for hydraulic compression control over combustion of homogeneous gas mixture of internal-combustion engine |
| CN103256125B (en) * | 2013-05-02 | 2015-07-15 | 浙江大学 | System for hydraulic compression control over combustion of homogeneous gas mixture of internal-combustion engine |
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Granted publication date: 20120222 Effective date of abandoning: 20130424 |
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| RGAV | Abandon patent right to avoid regrant |