CN106593724B - Bypass type electric control oil injector with hydraulic feedback - Google Patents
Bypass type electric control oil injector with hydraulic feedback Download PDFInfo
- Publication number
- CN106593724B CN106593724B CN201710034989.1A CN201710034989A CN106593724B CN 106593724 B CN106593724 B CN 106593724B CN 201710034989 A CN201710034989 A CN 201710034989A CN 106593724 B CN106593724 B CN 106593724B
- Authority
- CN
- China
- Prior art keywords
- oil
- valve
- control
- cavity
- hole
- 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.)
- Active
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1893—Details of valve member ends not covered by groups F02M61/1866 - F02M61/188
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
- F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
- F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
- F02M63/0035—Poppet valves, i.e. having a mushroom-shaped valve member that moves perpendicularly to the plane of the valve seat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
- F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
- F02M63/0036—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat with spherical or partly spherical shaped valve member ends
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
Abstract
The invention aims to provide a bypass type electric control oil injector with hydraulic feedback, which comprises an oil injector head, an oil injector body, a flow limiting valve component, a solenoid valve component, a needle valve component and the like. The pressure accumulation cavity is arranged in the oil sprayer body and communicated with the main oil inlet hole and the flow limiting valve assembly, so that the stability of the oil spraying process of each cylinder can be ensured when oil is sprayed with large pulse width. The flow-limiting valve assembly is arranged below the pressure accumulation cavity, so that abnormal continuous oil injection is avoided. The existence of a feedback oil path in the electromagnetic valve component slows down the opening speed of the needle valve; and the system can build pressure quickly, improve the seating speed of the needle valve and control the oil injector to finish oil injection quickly. The control cavity is internally provided with a control slide block which is contacted with the middle block, so that the effects of slowing down the oil injection rate at the initial stage of injection and quickening the seating response of the needle valve are achieved. The internal hydraulic pressure of the nozzle part is balanced, and no static pressure difference exists, so that the function of no static leakage of the oil sprayer is realized.
Description
Technical Field
The invention relates to an oil injection device of an engine, in particular to a high-pressure common rail oil injection device.
Background
As the demand for fuel economy and emission characteristics of engines increases, emission limits are dominated by both nitrogen oxides and particulate matter. In order to reduce the emission of nitrogen oxides, the needle valve is required to be controlled to open at the beginning of oil injection, so that a low oil injection rate and a slowly-rising oil injection rate form exist in an ignition combustion delaying period, and the consistency of an oil injection process and the oil injection rate form is favorably ensured; and the needle valve is required to be closed quickly when oil injection is finished, so that the system is favorable for quick pressure build-up. The fuel injection characteristic curve of firstly slow and then fast can be realized, and the soot emission and the fuel consumption are the lowest. In addition, the existence of the control plunger causes static pressure difference of the fuel injector, and fuel static leakage is caused.
Disclosure of Invention
The invention aims to provide a by-pass electronic control oil injector with hydraulic feedback, which has a quick needle valve response characteristic, can realize a slow-to-fast oil injection rate time history curve and a static leakage-free function
The purpose of the invention is realized as follows:
the invention relates to a bypass type electric control oil injector with hydraulic feedback, which is characterized in that: the oil sprayer comprises an oil sprayer head, an oil sprayer body, a flow limiting valve assembly, a solenoid valve assembly, a needle valve assembly, a nozzle and a downlink high-pressure oil way, wherein the oil sprayer head is arranged above the oil sprayer body, a main oil inlet hole is formed in the oil sprayer head, a pressure accumulation cavity is formed in the oil sprayer body, the main oil inlet hole is communicated with the pressure accumulation cavity, the flow limiting valve assembly is arranged in the pressure accumulation cavity, the solenoid valve assembly, the needle valve assembly and the nozzle are sequentially arranged at the lower end of the oil sprayer body, a tightening cap is positioned outside the solenoid valve assembly, the needle valve assembly and the nozzle, and the upper end of the tightening cap is connected with the lower end of the oil sprayer body in a threaded connection mode;
the flow limiting valve assembly comprises a limiting spring seat, a flow limiting piston, a ball valve reset spring seat and a supporting control slider, wherein the limiting spring seat, the flow limiting piston and the ball valve reset spring seat are arranged from top to bottom;
the electromagnetic valve component comprises an electromagnet, a coil, an armature, a balance valve rod, a valve seat and an intermediate block, wherein the coil is wound on the electromagnet, an electromagnetic valve reset spring seat is arranged above the electromagnet, the armature is arranged below the electromagnet, an electromagnetic valve reset spring is arranged between the armature and the electromagnetic valve reset spring seat, the balance valve rod is positioned in the valve seat, the upper end part of the balance valve rod is fixedly connected with the armature, the intermediate block is arranged below the valve seat, a balance valve rod cavity is formed among the lower end part of the balance valve rod, the valve seat and the intermediate block, an oil return hole, an intermediate orifice, an intermediate oil way and a feedback oil way are arranged in the intermediate block, the intermediate orifice is respectively communicated with the intermediate oil way and the balance valve rod cavity, the feedback oil way is communicated with the balance valve rod cavity, and the oil return hole is communicated with or disconnected with the intermediate orifice and the oil tank under the control of the balance valve rod;
the needle valve assembly comprises a needle valve limiting sleeve, a control slider and a needle valve body, wherein the control slider is positioned in the needle valve limiting sleeve, the upper part of the needle valve body is positioned in the needle valve limiting sleeve, the lower part of the needle valve body is positioned in a nozzle, a control cavity is formed between the control slider and the needle valve body, a control slider reset spring is arranged in the control cavity, a bulge part is arranged in the middle of the needle valve body, the needle valve reset spring is arranged between the bulge part and the needle valve limiting sleeve above the bulge part, a middle cavity is arranged on the upper end face of the control slider, an oil inlet hole, a control slider through hole and a bypass oil path are arranged in the control slider, the oil inlet hole is communicated with the middle cavity through an oil inlet throttling hole, the control slider through hole is respectively communicated with the middle cavity and the control cavity, the bypass oil path is communicated with the control cavity, an oil containing groove is formed between the needle valve body and the nozzle, and the end part of the nozzle is provided with a spraying hole;
the middle oil way is communicated with the middle cavity, the upper end of the downlink high-pressure oil way is communicated with the transition oil cavity, the transition oil cavity is communicated with the oil containing groove through the oil injector body, the valve seat, the middle block, the needle valve limiting sleeve and the nozzle, and the oil inlet hole and the feedback oil way are respectively communicated with the downlink high-pressure oil way.
The present invention may further comprise:
1. when the spray hole sprays oil, the fuel pressure of the transition oil cavity is reduced, the whole of the flow-limiting piston, the ball valve and the supporting control slide block moves downwards, the ball valve is not seated on the ball valve reset spring seat, and the flow-limiting hole is communicated with the axial central through hole; when the quality of fuel flowing out of the spray hole exceeds a threshold value, the flow-limiting piston compresses the ball valve and enables the ball valve to be seated on a ball valve reset spring seat, and the flow-limiting hole is disconnected with the axial central through hole; when the spray hole stops spraying oil, the flow-limiting piston, the ball valve and the supporting control slide block are integrally restored to the initial positions under the action of the ball valve return spring.
2. When the coil is electrified, the balance valve rod moves upwards, the oil return hole is communicated with the oil tank, fuel oil in the control cavity returns to the oil tank through the middle oil way, the middle throttling hole and the oil return hole, the needle valve body is lifted upwards, and the spraying hole is opened to spray oil; after the coil is powered off, the balance valve rod moves downwards under the action of the electromagnetic valve reset spring and is pressed on the upper end face of the middle block, the oil return hole is disconnected with the oil tank, and meanwhile, fuel in the downlink high-pressure oil way enters the control cavity through the feedback oil way, the balance valve rod cavity and the middle oil way and enters the control cavity through the oil inlet hole.
3. When the spray hole stops spraying oil, the fuel pressure of the upper end face of the control slide block is higher than that of the lower end face of the control slide block, the control slide block overcomes the pre-tightening force of the return spring of the control slide block to move downwards, the bypass oil way is opened, and the control slide block returns to the initial position under the action force of the return spring of the control slide block along with the fuel entering the control cavity.
The invention has the advantages that: the invention adopts the pressure accumulation cavity structure, can greatly improve the pressure fluctuation of the whole oil injection system, and particularly can reduce the mutual interference of each oil injector during oil injection. The invention adopts the flow limiting valve component in structure, effectively avoids abnormal conditions such as abnormal oil injection and the like, ensures normal and stable oil injection process and simultaneously improves the fuel economy and the working reliability of the oil injector. The invention adopts the electromagnetic valve to control the balance valve rod to adjust the switch of the oil return way, is beneficial to improving the response speed and the control precision of the needle valve, provides a flexible oil injection rule and effectively improves the discharge stability and the economical efficiency of the diesel engine. A hydraulic feedback oil circuit is added in the middle block of the electromagnetic valve component and is communicated with a high-pressure oil circuit and a middle oil circuit, so that the needle valve can be opened slowly, the pressure of the system can be built quickly, the seating speed of the needle valve is improved, and the oil injector can be controlled to finish oil injection quickly. The bypass oil circuit of the control slider in the control cavity can enable the control cavity to build pressure more quickly, and response characteristics of the needle valve are improved. The design of the throttle hole of the control slide block and the middle throttle hole ensures that the oil injector can inject oil slowly at the initial stage, and the formation of nitrogen oxides is reduced. The internal hydraulic pressure of the nozzle part is balanced, and no static pressure difference exists, so that the function of no static leakage of the oil sprayer is realized.
Drawings
FIG. 1 is a schematic view of the structure of the present invention;
FIG. 2 is a schematic view of a constrictor valve assembly;
FIG. 3 is a schematic view of a solenoid valve assembly;
FIG. 4 is a schematic view of a needle valve assembly;
fig. 5 isbase:Sub>A viewbase:Sub>A-base:Sub>A.
Detailed Description
The invention will now be described in more detail by way of example with reference to the accompanying drawings in which:
referring to fig. 1-5, the present invention includes an injector head 1, a flow restriction valve assembly 3, a solenoid valve assembly 5, a needle valve assembly 6, a nozzle 9, a locking cap 10, and an injector body 11. The injector head 1 is installed on the injector body 11 by matching connection through screw threads and is sealed by a seal ring 2 placed on the injector body 11. A main oil inlet hole 13 is arranged in the oil injector head 1 and is communicated with a pressure accumulation cavity 12 in the oil injector body 11. A flow limiting valve assembly 3 is arranged below the pressure accumulation cavity 12. The flow limiting valve component 3 is arranged in the oil injector body 11, and mainly comprises a retainer ring 14, a damping spring 15, a ball valve 17, a support control slider 18, a ball valve return spring 21, a ball valve return spring seat 22, a flow limiting piston 23 and a limiting spring seat 25. The flow-limiting hole 16 and the piston blind hole 24 are processed on the flow-limiting piston 23, and the axial central through hole 19 is processed on the supporting control slider 18, so that the fuel can smoothly flow to a lower oil way. The electromagnetic valve component 5 and the needle valve component 6 are arranged below the oil injector body 11 in sequence and are assembled and connected through a tightening cap 10. The main structure of the solenoid valve assembly 5 comprises a solenoid valve return spring seat 26, a coil 27, an armature 28, a valve seat 29, an intermediate block 33, a balance valve rod 35, an electromagnet 36 and a solenoid valve return spring 37. The armature 28 and the balance stem 35 are mounted in combination inside the valve seat 29. The feedback oil path 30, the oil return hole 31, the intermediate oil path 32 and the intermediate orifice 34 are formed in the intermediate block 33, and the intermediate block 33, the needle valve stop collar 43 and the needle valve body 41 form a control chamber 44. The needle valve assembly 6 is arranged below the electromagnetic valve assembly 5, and mainly structurally comprises a control slide block return spring 40, a needle valve body 41, a needle valve return spring 42, a needle valve limiting sleeve 43 and a control slide block 45. The control slider 45 is arranged in the control cavity 44, and is provided with a bypass oil path 38, a control slider through hole 39 and an oil inlet throttle hole 47. The oil inlet orifice 47 is communicated with the oil inlet hole 46 on the needle valve limiting sleeve 43. The needle valve body 41 is installed in the nozzle 9, and the oil containing groove 8 is arranged between the nozzle 9 and the needle valve body 41.
Fig. 1 is a schematic diagram of the overall structure of a bypass type electronic control fuel injector with hydraulic feedback, and a main fuel inlet hole 13 is formed in a fuel injector head 1. The injector body 11 is provided with a pressure accumulation cavity 12, and the pressure accumulation cavity 12 is communicated with a main oil inlet hole 13. The injector head 1 and the injector body 11 are assembled through threads, and the sealing ring 2 seals the injector head and the injector body. When high-pressure fuel delivered in enters the interior of the fuel injector through the main fuel inlet hole 13, the fuel flowing through the pressure accumulation chamber 12 passes downward through the restrictor valve assembly 3. After flowing out of the flow limiting valve assembly 3, the fuel flows through the descending high-pressure oil way 4 to enter the control cavity 44 and the oil containing groove 8. A solenoid valve assembly 5 and a needle valve assembly 6 are sequentially assembled between the lower part of the flow limiting valve assembly 3 and the upper part of the nozzle 9. Within the solenoid valve assembly 5, the lifting and seating of the armature 28 and the balance valve rod 35 are controlled by electromagnetic force. When the coil 27 is energized, the balance valve rod 35 is lifted upwards, the oil return hole 31 is opened, and fuel oil in the control cavity 44 flows through the control slider through hole 39, the middle oil passage 32 and the middle throttle hole 34 and is drained through the oil return hole 31. Therefore, the fuel pressure in the control chamber 44 is reduced to form a fuel pressure difference with the oil containing groove 8, so that the needle valve body 41 is lifted and the oil injection is started. In this process, the needle valve stopper 43 functions to limit the displacement of the needle valve body 41. The presence of the two-stage throttling of the control slider through-hole 39 and the intermediate orifice 34 ensures that the fuel pressure in the intermediate fuel passage 32 does not drop rapidly, which slows the rate of drop of the fuel pressure in the control chamber 44. When the coil 27 is de-energized, when the balancing valve rod 35 is seated downwards, the oil return hole 31 is closed, and the fuel directly enters the control chamber 44 through the oil inlet hole 46 and the oil inlet throttle hole 47, so that the control chamber 44 is pressurized, the needle valve body 41 is seated, and the oil injection process is finished. The needle valve body 41 is installed inside the nozzle 9 and is pressed by a needle valve return spring 42. The nozzle 9 and the solenoid valve assembly 5 are mounted inside the tightening cap 10 and are secured by the injector body 11 and the thread. The internal hydraulic pressure of the nozzle 9 is balanced, and no static pressure difference exists, so that the function of no static leakage of the oil injector is realized.
Fig. 2 is a schematic view of a portion of a constrictor valve assembly of the present invention. The device comprises a retainer ring 14, a damping spring 15, a ball valve 17, a support control slider 18, a ball valve return spring 21, a ball valve return spring seat 22, a flow limiting piston 23, a limiting spring seat 25 and the like. The restrictor valve assembly 3 is arranged inside the injector body 11 via a pressure accumulation chamber 12. The retainer ring 14 not only limits the overall restrictor valve assembly 3, but also cooperates with a limiting spring seat 25, which acts as a spring seat for the damping spring 15 on the one hand, and limits the maximum displacement of the restrictor piston 23 on the other hand. Under the action of the spring pre-tightening force of the damping spring 15 and the ball valve return spring 21, the ball valve 17 is matched with the lower end surface of the flow limiting piston 23 and the upper end surface of the supporting control slide block 18. The ball valve return spring seat 22 is pressed at the bottom under the spring force of the ball valve return spring 21, and the seat surface of the ball valve 17 is formed at the upper variable cross section. High-pressure fuel enters the blind piston bore 24 in the restrictor piston 23 via the pressure accumulation chamber 12, flows through the restrictor bore 16 and into the axially central through bore 19 of the support control slide 18. The fuel oil flowing out is led to the lower oil way through the lower high-pressure oil way 4. When the fuel injector works normally, the fuel is sprayed out from the spray holes 7, so that the pressure of the fuel in the transition oil cavity 20 is reduced. Due to the throttling effect of the flow limiting hole 16 on the fuel, the pressure of the fuel in the piston blind hole 24 in the flow limiting piston 23 and the pressure accumulation cavity 12 is increased, and a pressure difference is formed between the pressure of the fuel in the transition oil cavity 20, so that the flow limiting piston 23, the ball valve 17 and the support control slide block 18 are integrally displaced downwards, the fuel sprayed by the fuel injector is compensated to a certain extent, and the ball valve 17 is not seated on the ball valve reset spring seat 22. When the fuel injection stops working, the pressure difference of the upper surface and the lower surface of the flow-limiting piston 23 is gradually reduced along with the fuel flowing through the flow-limiting hole 16, and the flow-limiting piston 23, the ball valve 17 and the supporting control slide block 18 are restored to the initial positions under the action of the ball valve return spring 21. When the spray hole 7 continuously sprays fuel, the mass of the flowing fuel exceeds a threshold value, so that the fuel injector is in an abnormal working state, the oil pressure of the transition oil cavity 20 below the flow limiting piston 23 is rapidly reduced, an up-down pressure difference is formed, the flow limiting piston 23 presses the ball valve 17 to be seated on the ball valve reset spring seat 22, and the fuel is prevented from continuously flowing. Because the fuel supply is cut off, the fuel injector stops working, thereby reducing the occurrence of abnormal fuel injection to a certain extent and improving the fuel economy and the working stability of the fuel injector.
Fig. 3 is a schematic view of a part of the structure of the solenoid valve assembly of the present invention. The electromagnetic valve comprises an electromagnetic valve return spring seat 26, a coil 27, an armature 28, a valve seat 29, an intermediate block 33, a balance valve rod 35, an electromagnet 36, an electromagnetic valve return spring 37 and the like. The solenoid valve return spring seat 26, the coil 27, the electromagnet 36 and the solenoid valve return spring 37 are built in the injector body 11, wherein the solenoid valve return spring seat 26 is fastened to the topmost end of the solenoid valve by a screw thread. The solenoid return spring 37 is between the solenoid return spring seat 26 and the armature 28, and the armature 28 and the balance valve rod 35 are disposed inside the valve seat 29 below the injector body 11. The intermediate block 33 is located below the valve seat 29. When the injector starts to inject fuel, the coil 27 is electrified to form a magnetic circuit with the armature 28 and the electromagnet 36, electromagnetic force is generated, the balance valve rod 35 is attracted to move upwards, and the oil return hole 31 in the middle block 33 is opened. At this time, the fuel in the control chamber 44 passes through the intermediate oil passage 32, the intermediate orifice 34 and the oil return hole 31 in order to return to the oil tank, the pressure of the fuel in the control chamber 44 decreases, the upper surface of the needle valve body 41 is pressed and reduced, and a pressure difference is formed between the upper surface of the needle valve body and the pressure of the fuel in the oil containing groove 8. Under the action of the pressure difference, the needle valve body 41 is slowly lifted upwards, and the spray hole 7 is opened to spray oil. When the injector stops injecting fuel, the coil 27 is cut off, and because the armature 28 and the balance valve rod 35 are tightly combined into a whole, they are moved downwards under the action of the spring pre-tightening force of the electromagnetic valve return spring 37, and are pressed on the upper end surface of the intermediate block 33, and the oil return hole 31 is blocked. Meanwhile, two oil inlets are formed, one oil inlet enters the lower needle valve component through the feedback oil circuit 30 and flows through the middle oil circuit 32; the other path is to enter the control cavity 44 through an oil path in the lower control slide block 45. In the whole oil injection process, high-pressure fuel oil always enters the upper oil cavity through the feedback oil way 30, so that the oil pressure reduction rate of the control cavity 44 is reduced, the pressure drop of the control cavity 44 at the initial stage of oil injection is reduced and slowed, and the generation of nitrogen oxides is reduced; and when oil injection is finished, the pressure building speed of a normal single oil inlet hole to the control cavity 44 is increased, the seating speed of the needle valve is increased, and the response speed of the needle valve is optimized.
FIG. 4 is a schematic view of a portion of a needle valve assembly according to the present invention. The needle valve consists of a control slide block return spring 40, a needle valve body 41, a needle valve return spring 42, a needle valve limiting sleeve 43, a control slide block 45 and the like. A control slide 45 is arranged in the control chamber 44, and the control slide return spring 40 jacks up the control slide 45 and abuts against the lower end face of the intermediate block 33. The control slider 45 is provided with a bypass oil path 38, a control slider through hole 39 and an oil inlet throttle hole 47. When the oil injection starts, under the two-stage throttling action of the middle throttling hole 34 on the middle block 33 and the control slide block through hole 39, the pressure of the fuel oil in the control cavity 44 drops more slowly than that of the normal oil injector, and the emission of nitrogen oxides is reduced. When the oil injection is finished, because the fuel pressure on the upper end surface of the control slider 45 is higher than that on the lower end surface, the control slider 45 overcomes the spring pre-tightening force of the control slider return spring 40 to displace downwards, the bypass oil path 38 is opened, the fuel pressure in the control cavity 44 is quickly established, and the seating response of the needle valve is improved. As fuel enters the control chamber 44, the pressure differential across the upper and lower end surfaces of the control slide 45 becomes smaller. The control slider 45 is returned to the initial position by the force of the control slider return spring 40.
Fig. 5 is an enlarged view of the needle valve body 41 in sectionbase:Sub>A-base:Sub>A. The arc-shaped surface can play a good role in guiding.
According to the working process, in the oil injection process of the bypass type electric control oil injector with hydraulic feedback, the control slider through hole 39 and the bypass oil way 38 which are processed in the control cavity 44 realize the characteristics of low oil injection speed in the initial injection stage and quick oil cut-off after oil injection is finished. The flow-limiting valve component 3 arranged in the oil injector body 11 effectively prevents the abnormal oil injection state from continuously running, and ensures the stability and the fuel economy of the working process. The feedback oil circuit 30 is added in the electromagnetic valve component 5 part, so that the needle valve is opened slowly, the pressure of the system can be built quickly, the seating speed of the needle valve is improved, and the fuel injector is controlled to finish fuel injection quickly. The whole oil injection process is controlled by the electromagnetic valve, the electromagnetic force is utilized to drive the balance valve rod to move, and the requirements of high response speed, high control precision and variable oil injection rule in the oil injection process are met. When the invention is applied to a common rail system, the pressure fluctuation of the common rail can be effectively reduced by adopting the structure of the pressure storage cavity 12 under the large-oil-volume injection state, thereby reducing the phenomena of uniformity and stability reduction of the oil injection process of each cylinder.
Claims (3)
1. The utility model provides a take automatically controlled sprayer of hydraulic feedback by pass formula which characterized by: the oil injection device comprises an oil injector head, an oil injector body, a flow limiting valve component, a solenoid valve component, a needle valve component, a nozzle and a downlink high-pressure oil way, wherein the oil injector head is arranged above the oil injector body;
the flow limiting valve assembly comprises a limiting spring seat, a flow limiting piston, a ball valve reset spring seat and a supporting control slider, wherein the limiting spring seat, the flow limiting piston and the ball valve reset spring seat are arranged from top to bottom;
the electromagnetic valve component comprises an electromagnet, a coil, an armature, a balance valve rod, a valve seat and an intermediate block, wherein the coil is wound on the electromagnet, an electromagnetic valve reset spring seat is arranged above the electromagnet, the armature is arranged below the electromagnet, an electromagnetic valve reset spring is arranged between the armature and the electromagnetic valve reset spring seat, the balance valve rod is positioned in the valve seat, the upper end part of the balance valve rod is fixedly connected with the armature, the intermediate block is arranged below the valve seat, a balance valve rod cavity is formed among the lower end part of the balance valve rod, the valve seat and the intermediate block, an oil return hole, an intermediate orifice, an intermediate oil way and a feedback oil way are arranged in the intermediate block, the intermediate orifice is directly communicated with the intermediate oil way and the balance valve rod cavity respectively, the feedback oil way is directly communicated with the balance valve rod cavity, and the oil return hole is communicated with or disconnected with the intermediate orifice and an oil tank under the control of the balance valve rod;
the needle valve assembly comprises a needle valve limiting sleeve, a control slider and a needle valve body, wherein the control slider is positioned in the needle valve limiting sleeve, the upper part of the needle valve body is positioned in the needle valve limiting sleeve, the lower part of the needle valve body is positioned in a nozzle, a control cavity is formed between the control slider and the needle valve body, a control slider reset spring is arranged in the control cavity, a bulge part is arranged in the middle of the needle valve body, the needle valve reset spring is arranged between the bulge part and the needle valve limiting sleeve above the bulge part, a middle cavity is arranged on the upper end face of the control slider, an oil inlet orifice, a control slider through hole and a bypass oil path are arranged in the control slider, the oil inlet hole is communicated with the middle cavity through the oil inlet orifice, the control slider through hole is respectively communicated with the middle cavity and the control cavity, the bypass oil path is communicated with the control cavity, an oil containing groove is formed between the needle valve body and the nozzle, and the end part of the nozzle is provided with an orifice;
the middle oil way is communicated with the middle cavity, the upper end of the downlink high-pressure oil way is communicated with the transition oil cavity, the transition oil cavity is communicated with the oil containing groove through the oil sprayer body, the valve seat, the middle block, the needle valve limiting sleeve and the nozzle, and the oil inlet hole and the feedback oil way are respectively communicated with the downlink high-pressure oil way;
when the spray hole sprays oil, the fuel pressure of the transition oil cavity is reduced, the whole of the flow-limiting piston, the ball valve and the supporting control slide block moves downwards, the ball valve is not seated on the ball valve reset spring seat, and the flow-limiting hole is communicated with the axial central through hole; when the mass of the fuel flowing out of the spray hole exceeds a threshold value, the flow limiting piston compresses the ball valve and enables the ball valve to be seated on a ball valve reset spring seat, and the flow limiting hole is disconnected with the axial central through hole; when the spray hole stops spraying oil, the flow-limiting piston, the ball valve and the supporting control slide block are integrally restored to the initial positions under the action of the ball valve return spring.
2. The bypass type electric control oil injector with hydraulic feedback as claimed in claim 1, wherein: when the coil is electrified, the balance valve rod moves upwards, the oil return hole is communicated with the oil tank, fuel oil in the control cavity returns to the oil tank through the middle oil way, the middle throttling hole and the oil return hole, the needle valve body is lifted upwards, and the spraying hole is opened to spray oil; after the coil is powered off, the balance valve rod moves downwards under the action of the electromagnetic valve reset spring and is pressed on the upper end face of the middle block, the oil return hole is disconnected with the oil tank, and meanwhile, fuel in the downlink high-pressure oil way enters the control cavity through the feedback oil way, the balance valve rod cavity and the middle oil way and enters the control cavity through the oil inlet hole.
3. The bypass type electronic fuel injector with hydraulic feedback as claimed in claim 1 or 2, characterized in that: when the spray hole stops spraying oil, the fuel pressure of the upper end face of the control slide block is higher than that of the lower end face of the control slide block, the control slide block overcomes the pre-tightening force of the return spring of the control slide block to move downwards, the bypass oil way is opened, and the control slide block returns to the initial position under the action force of the return spring of the control slide block along with the fuel entering the control cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710034989.1A CN106593724B (en) | 2017-01-18 | 2017-01-18 | Bypass type electric control oil injector with hydraulic feedback |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710034989.1A CN106593724B (en) | 2017-01-18 | 2017-01-18 | Bypass type electric control oil injector with hydraulic feedback |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106593724A CN106593724A (en) | 2017-04-26 |
| CN106593724B true CN106593724B (en) | 2023-03-21 |
Family
ID=58586420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710034989.1A Active CN106593724B (en) | 2017-01-18 | 2017-01-18 | Bypass type electric control oil injector with hydraulic feedback |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106593724B (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000205085A (en) * | 1999-01-11 | 2000-07-25 | Mitsubishi Heavy Ind Ltd | Unit injector |
| DE102006049883A1 (en) * | 2006-10-23 | 2008-04-24 | Robert Bosch Gmbh | Fuel injecting valve for internal-combustion engine, has housing with inlet connected with side of draining throttle over inlet throttle, where side is turned away from chamber that is connected with inlet over another inlet throttle |
| DE102009055267A1 (en) * | 2009-12-23 | 2011-06-30 | Robert Bosch GmbH, 70469 | Pressure compensated fuel injector with bypass and minimized valve volume |
| DE102010039051A1 (en) * | 2010-08-09 | 2012-02-09 | Robert Bosch Gmbh | Injector |
| CN104018966B (en) * | 2014-05-29 | 2016-06-29 | 哈尔滨工程大学 | Pressure accumulation current-limiting type electromagnetic control oil sprayer |
| CN104533683B (en) * | 2014-11-26 | 2017-01-25 | 中国北方发动机研究所(天津) | High-pressure co-rail oil sprayer sliding valve structure |
| CN104912707A (en) * | 2015-06-23 | 2015-09-16 | 哈尔滨工程大学 | Bivalve-cooperated electromagnetic control oil spray device |
| CN206397637U (en) * | 2017-01-18 | 2017-08-11 | 哈尔滨工程大学 | A kind of bypass type electric-controlled fuel injector with hydraulic feedback |
-
2017
- 2017-01-18 CN CN201710034989.1A patent/CN106593724B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN106593724A (en) | 2017-04-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106545448B (en) | Double-path oil inlet resonance bypass type electric control oil injector | |
| CN104018966A (en) | Pressure accumulation flow-limiting type electromagnetic control oil sprayer | |
| CN206352546U (en) | A kind of On Fluctuations oil return electric-controlled fuel injector with hydraulic feedback | |
| CN104018965A (en) | Electromagnetic control pressure-storage and pressure-stabilizing oil sprayer | |
| CN115387944B (en) | Low oil return variable needle valve opening speed electric control oil sprayer | |
| CN106762288B (en) | Pressure accumulation hole plate type electric control oil injector with hydraulic feedback | |
| CN106762279B (en) | Resonance bypass type electric control oil injector with hydraulic feedback | |
| CN203892092U (en) | Pressure accumulating and flow limiting electromagnetic control oil atomizer | |
| CN107035586B (en) | Micro-dynamic oil return resonant type electric control oil injector with hydraulic feedback | |
| CN210919296U (en) | Piston type hydraulic compensation pressurization electric control oil injector | |
| CN106762281B (en) | Electric control oil injector with hydraulic feedback | |
| CN106593724B (en) | Bypass type electric control oil injector with hydraulic feedback | |
| CN206617265U (en) | Two-way oil-feed resonant mode electric-controlled fuel injector | |
| CN106762286B (en) | Micro-dynamic oil return bypass type electric control oil injector with hydraulic feedback | |
| CN106545444B (en) | Double-path oil inlet bypass type electric control oil sprayer with grooves | |
| CN206625925U (en) | A kind of pressure accumulation orifice-plate type electric-controlled fuel injector with hydraulic feedback | |
| CN115450811A (en) | Variable oil injection rule electric control oil injector based on needle valve lift adjustment | |
| CN106640453B (en) | Micro-dynamic oil return electric control oil injector with hydraulic feedback | |
| CN106523225B (en) | Resonant type electric control oil injector with hydraulic feedback | |
| CN206352553U (en) | Bypass type electric-controlled fuel injector | |
| CN113790117A (en) | High-pressure common rail oil injector based on flexible and controllable oil injection rule of electromagnetic proportional valve | |
| CN206352542U (en) | A kind of bypass type electric-controlled fuel injector with ditch | |
| CN206608261U (en) | A kind of On Fluctuations oil return resonant mode electric-controlled fuel injector | |
| CN109236532B (en) | Electric control oil injector with control cavity sliding block | |
| CN206352543U (en) | A kind of two-way oil-feed bypass type electric-controlled fuel injector with ditch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |