CN106640453B - Micro-dynamic oil return electric control oil injector with hydraulic feedback - Google Patents
Micro-dynamic oil return electric control oil injector with hydraulic feedback Download PDFInfo
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- CN106640453B CN106640453B CN201710034600.3A CN201710034600A CN106640453B CN 106640453 B CN106640453 B CN 106640453B CN 201710034600 A CN201710034600 A CN 201710034600A CN 106640453 B CN106640453 B CN 106640453B
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention aims to provide a micro-dynamic oil return electric control oil injector with hydraulic feedback, which comprises an oil injector head, an oil injector body, a flow limiting valve component, an electromagnetic valve component, a needle valve limiting sleeve, a nozzle and a needle valve body. The pressure storage cavity is arranged in the oil sprayer body and communicated with the main oil inlet hole and the flow limiting valve assembly, and stability of oil spraying processes of all cylinders is guaranteed under the condition of large oil spraying quantity. The flow-limiting valve assembly is placed below the pressure accumulation cavity, and abnormal oil injection is prevented from being continuously performed. The electromagnetic valve component is processed at the bottom of the oil sprayer body, the valve rod is driven to move by electromagnetic force, the annular throttle belt and the oil inlet throttle hole at the conical surface of the balance valve rod are matched with the hydraulic feedback oil duct, so that the variable oil spraying rule from slow to fast at the beginning of oil spraying is realized, and the seat response of the needle valve is accelerated. The electromagnetic valve adopts a two-position three-way valve form, so that the dynamic oil return amount in the oil injection process is greatly reduced. The oil sprayer has no static pressure difference inside, so that the oil sprayer has no static leakage, and the hydraulic efficiency of the system is improved.
Description
Technical Field
The invention relates to an engine fuel injection device.
Background
At present, the adopted high-speed electromagnetic valve oil sprayer has the advantages of quick system response, high control precision, flexible control strategy, reliable working performance and the like. However, in view of the escalating requirements of emission legislation, there are a number of areas where such electronically controlled fuel injectors need improvement and escalation: firstly, in order to ensure a normal injection process of the oil injector, the aperture of an oil outlet orifice of the oil injector needs to be larger than that of an oil inlet orifice, and the aperture of the oil inlet orifice needs to be enlarged to further improve the seating response characteristic of a needle valve, but the dynamic oil return amount is increased, and energy loss is caused. Conversely, if the diameter of the oil outlet orifice is reduced to reduce the amount of dynamic oil return, the control chamber pressure buildup speed is slowed, and the needle seating is delayed. Secondly, static leakage exists on the axial sealing surfaces of a control plunger matching part and a needle valve matching part in the oil injector, so that the hydraulic efficiency of the system is reduced, and the further increase of the pressure of the oil injector is limited. In addition, when the oil injector injects a large amount of oil, the oil pressure in the high-pressure common rail can fluctuate sharply, and the consistency of the oil injection process of each cylinder is reduced.
Disclosure of Invention
The invention aims to provide a micro-dynamic oil return electric control oil injector with hydraulic feedback, which has small dynamic oil return amount and can realize variable oil injection rule and no static leakage function.
The purpose of the invention is realized as follows:
the invention relates to a micro-dynamic oil return 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 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 storage cavity is formed in the oil sprayer body, the main oil inlet hole is communicated with the pressure storage cavity, the flow limiting valve assembly is arranged in the pressure storage cavity, the solenoid valve assembly and the needle valve assembly are sequentially arranged at the lower end of the oil sprayer body, a tightening cap is positioned outside the solenoid valve assembly and the needle valve assembly, 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 slide block, 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 assembly 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 upper cavity is formed between the middle part of the balance valve rod and the valve seat, an oil cavity is formed between the lower end part of the balance valve rod, the valve seat and the intermediate block, an oil inlet orifice is arranged in the valve seat, an oil return hole, an intermediate oil passage and a hydraulic feedback oil passage are arranged in the intermediate block, the oil inlet orifice is communicated with the balance valve rod upper cavity, the intermediate oil passage and the hydraulic feedback oil passage are respectively communicated with the oil cavity, and the oil return hole is communicated with or disconnected with the intermediate oil passage and the oil tank under the control of the balance valve rod;
the needle valve assembly comprises a needle valve limiting sleeve, a nozzle and a needle valve body, the needle valve limiting sleeve is positioned in the nozzle, 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 the nozzle, a control cavity is formed between the upper part of the needle valve body and the needle valve limiting sleeve, a bulge is arranged on the needle valve limiting sleeve and positioned at the control cavity, a needle valve reset spring is arranged between the needle valve body and the bulge, the control cavity is communicated with a middle oil duct, 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 spray hole;
the upper end of the downlink high-pressure oil way is communicated with a transition oil cavity and is communicated with an oil containing groove through an oil sprayer body, a valve seat, a middle block and a nozzle, and an oil inlet throttling hole and a hydraulic 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 flow-limiting piston, the ball valve and the supporting slide block integrally move 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 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 upper cavity of the balance valve rod is in a disconnected state with the oil cavity, the oil return hole is in a communicated state with the oil tank, fuel oil in the control cavity returns to the oil tank through the middle oil duct and the oil return hole, the needle valve body is lifted upwards, and the spray 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 upper cavity of the balance valve rod is communicated with the oil cavity, the oil return hole is disconnected with the oil tank, and meanwhile, fuel oil in the descending high-pressure oil way enters the control cavity through the oil inlet throttle hole, the upper cavity of the balance valve rod, the oil cavity and the middle oil duct on one hand and enters the control cavity through the hydraulic feedback oil duct, the oil cavity and the middle oil duct on the other hand.
The invention has the advantages that: the invention adopts the pressure accumulation cavity structure, and ensures that the continuous oil injection process of the oil injector can not cause great fluctuation to the common rail fuel pressure to influence the oil injection processes of other oil injectors under the condition of large oil injection quantity. The invention adopts the flow limiting valve assembly, thereby effectively reducing the occurrence of abnormal oil injection conditions and ensuring the normal and stable oil injection process. The oil injector adopts the electromagnetic valve to control the balance valve rod to adjust the switch of the oil return way, thereby improving the control precision and the flexibility, effectively improving the discharge of the whole diesel engine and improving the fuel economy. The balance valve rod of the oil sprayer adopts a two-position three-way form, two-way sealing of a conical surface and a plane can be realized, and dynamic oil return amount is reduced. The annular throttle belt and the oil inlet throttle hole at the conical surface of the balance valve rod are matched with the hydraulic feedback oil channel to realize a variable oil injection rule, and the seat response of the needle valve is accelerated. And the static pressure difference does not exist in the oil sprayer, so that the oil sprayer can realize the function of static leakage-free.
Drawings
FIG. 1 is a schematic structural view 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 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:
with reference to fig. 1-4, the main structure of the electric control oil injector with hydrodynamic feedback and micro-dynamic oil return comprises an oil injector head 1, an oil injector body 14, a flow limiting valve assembly 3, an electromagnetic valve assembly 13, a tightening cap 5, a needle valve limiting sleeve 11, a nozzle 7 and a needle valve body 8. The injector head 1 is connected with the injector body 14 in a matching way through threads and is sealed by a sealing ring 15 arranged on the injector body 14. The main inlet opening 16 of the injector head 1 communicates with the pressure accumulation chamber 2 in the injector body 14. Below the injector body 14 is the solenoid valve assembly 13, the nozzle 7 and the needle valve body 8, which are assembled and connected by the locking cap 5. The flow limiting valve assembly 3 is arranged in the oil injector body 14 and mainly structurally comprises a check ring 17, a limiting spring seat 28, a damping spring 18, a limiting piston 19, a ball valve 26, a supporting slide block 21, a ball valve return spring 22 and a ball valve return spring seat 24. The flow-limiting piston 19 is provided with a flow-limiting hole 20 and a piston blind hole 27, and the supporting slide block 21 is provided with an axial central through hole 25 to ensure that fuel oil can be led to a lower oil way. An electromagnetic valve assembly 13 is arranged between the bottom of the oil injector body 14 and the upper part of the nozzle 7, and mainly structurally comprises an electromagnetic valve return spring 29, an electromagnetic valve return spring seat 42, a coil 30, an electromagnet 41, an armature 40, a valve seat 31, an intermediate block 37 and a balance valve rod 39. The armature 40 and balance valve stem 39 combination are placed in the valve seat 31 and the oil inlet orifice 32 is machined into the valve seat 31. The middle block 37 is internally provided with a hydraulic feedback oil path 33, an oil return hole 35, a middle oil path 36 and the like, and forms a control cavity 6 together with the needle valve limiting sleeve 11 and the needle valve body 8.
Fig. 1 is a general schematic view of the present invention, a main inlet hole 16 is formed on an injector head 1, and high-pressure fuel delivered by a high-pressure fuel pipe enters the interior of the injector through the main inlet hole 16. The injector head 1 is assembled with the injector body 14 by a thread line, and a sealing ring 15 is arranged between the injector head and the injector body for sealing. The main oil inlet hole 16 communicates with the pressure accumulation chamber 2. The fuel in the accumulator chamber 2 will pass down through the constrictor valve assembly 3. After flowing out from the flow-limiting valve assembly 3, the fuel enters the control cavity 6 and the oil containing groove 10 through the descending high-pressure oil way 4. An electromagnetic valve assembly 13 is arranged between the lower part of the oil sprayer body 14 and the nozzle 7. The lifting and seating of the armature 40 and the balance valve stem 39 is controlled by electromagnetic force within the solenoid valve assembly 13. When the balance valve rod 39 is lifted upward, the oil return hole 35 is opened, and the fuel in the control chamber 6 flows through the intermediate oil passage 36 into the oil chamber 33 and is discharged through the oil return hole 35. During the raising of the balancing valve stem 39, a small portion of the fuel enters the oil chamber 33 through the inlet orifice 32 and drains into the low pressure tank. This dynamic return is low compared to the dynamic return of a two-position two-way valve. Along with the reduction of the fuel pressure of the control cavity 6, a fuel pressure difference is formed between the control cavity and the oil containing groove 10, so that the needle valve body 8 overcomes the spring pretightening force of the needle valve return spring 12 to lift, and oil injection starts. Wherein the displacement of the needle valve body 8 is limited by the needle valve stop collar 11. When the balance valve rod 39 is seated downwards, the oil return hole 35 is closed, fuel oil flows through the oil inlet throttle hole 32 and the hydraulic feedback oil channel 34, flows through the balance valve rod 39, the oil cavity 33 and the middle oil channel 36, enters the control cavity 6, pressure of the control cavity 6 is built, the needle valve body 8 is seated under the spring pre-tightening force of the needle valve reset spring 12, and the oil injection process is finished. In the nozzle 7,base:Sub>A needle valve body 8 is placed which is pressed bybase:Sub>A needle valve return spring 12, and as shown in fig. 4, an enlarged view ofbase:Sub>A sectionbase:Sub>A-base:Sub>A of the needle valve body 8. The arc-shaped surface of the needle valve body 8 can play a good role in guiding. And no static pressure difference exists in the nozzle 7, so that the characteristic of no static leakage of the oil injector is ensured. The nozzle 7 and the solenoid assembly 13 are placed in the tightening cap 5 and are fastened to the injector body 14 by means of a thread.
Fig. 2 is a schematic view of a portion of a constrictor valve assembly of the present invention. The flow-limiting valve assembly 3 mainly comprises a retainer ring 17, a limiting spring seat 28, a damping spring 18, a flow-limiting piston 19, a ball valve 26, a supporting slider 21, a ball valve return spring 22, a ball valve return spring seat 24 and the like. The entire restrictor valve assembly 3 is arranged inside the injector body 14 via the pressure accumulation chamber 2 and is restricted by the stop ring 17. The limit spring seat 28 and the retainer ring 17 cooperate to act as a spring seat for the damping spring 18 on the one hand and to limit the maximum displacement of the limit piston 19 on the other hand. The ball valve 26 is matched with the lower end face of the flow-limiting piston 19 and the upper end face of the supporting slide block 21 by the spring pre-tightening force of the damping spring 18 and the ball valve return spring 22. The ball return spring seat 24 is pressed against the bottom by the spring force of the ball return spring 22, and the upper variable cross-section thereof is the seating surface of the ball 26. The fuel enters the blind piston hole 27 in the restrictor piston 19 from the pressure accumulation chamber 2 and then enters the axial central through hole 25 of the support slide 21 through the restrictor orifice 20. The fuel oil flowing out of the axial center through hole 25 passes through the downward high-pressure oil passage 4 and then flows to the lower oil passage. When the oil injector injects oil normally, the jet hole 9 injects the fuel oil, and the pressure of the fuel oil in the transition oil cavity 23 is reduced. Due to the throttling effect of the flow limiting hole 20 on the fuel, the pressure of the fuel in the piston blind hole 27 in the flow limiting piston 19 and the pressure accumulation cavity 2 is higher, and a pressure difference is formed between the fuel and the transition oil cavity 23, so that the flow limiting piston 19, the ball valve 26 and the supporting slide block 21 are displaced downwards to compensate the fuel sprayed by the fuel injector, but the ball valve 26 is not seated on the ball valve reset spring seat 24. When the oil injection is finished, the pressure difference between the upper part and the lower part of the flow-limiting piston 19 is gradually reduced along with the flowing of the fuel through the flow-limiting hole 20, and the flow-limiting piston 19, the ball valve 26 and the supporting slide block 21 are restored to the original positions under the action of the return spring force of the ball valve. When the spray holes 9 continuously spray fuel, the mass of the discharged fuel exceeds a threshold value, and the fuel injector is in an abnormal working state, the oil pressure of the transition oil cavity 23 below the flow-limiting piston 19 is rapidly reduced due to the large flow and the high flow speed of the fuel sprayed by the spray holes 9, so that an up-down pressure difference is formed, the flow-limiting piston 19 compresses the ball valve 26 to be seated on the ball valve reset spring seat 24, and the fuel is prevented from flowing. Due to the lack of fuel supply, the fuel injector stops operating, preventing continuation of abnormal fuel injection.
Fig. 3 is a schematic view of a part of the structure of the solenoid valve assembly of the present invention. The solenoid valve assembly 13 mainly comprises a solenoid valve return spring seat 42, a solenoid valve return spring 29, a coil 30, an electromagnet 41, an armature 40, a balance valve rod 39, a valve seat 31 and an intermediate block 37. The solenoid valve return spring seat 42, the solenoid valve return spring 29, the coil 30 and the electromagnet 41 are built inside the injector body 14, wherein the solenoid valve return spring seat 42 is fastened to the topmost end of the solenoid valve by a screw thread. Between the solenoid valve return spring seat 42 and the armature 40 is the solenoid valve return spring 29. The armature 40 and the balancing stem 39 are placed inside the valve seat 31 below the injector body 14. The part that joins the valve seat 31 at the bottom is an intermediate block 37. The whole electromagnetic valve is in the form of a two-position three-way valve. When the injector is not in operation, an annular throttle band 38 is present between the conical surface of the balancing stem 39 and the conical junction surface of the valve seat 31. When the injector starts to inject oil, the coil 30 of the solenoid valve is electrified to form a magnetic loop with the electromagnet 41 and the armature 40, so as to generate electromagnetic force and attract the balance valve rod 39 to move upwards. The equivalent flow area of the annular throttle belt 38 is denoted as A1, the effective flow area of the oil inlet orifice 32 is denoted as A2, and A1 is larger than A2 when the fuel injector non-operation balance valve rod 39 is pressed against the upper end face of the intermediate block. During the upward movement of the balancing valve rod 39, the throttle area A1 of the annular throttle belt 38 is continuously reduced to 0. When A1 is larger than A2, the throttling effect is mainly realized by the oil inlet throttling hole 32, and the pressure relief speed of the control cavity 6 is fixed; when A1 is smaller than A2, the throttling effect is mainly realized by the annular throttling belt 38, the throttling effect is more and more obvious as the throttling area A1 of the annular throttling belt 38 is continuously reduced, the pressure relief speed of the control cavity 6 through the middle oil duct 36 is faster and faster, and the oil injection speed is gradually increased; when the balance valve rod 39 moves to be completely matched with the conical surface of the valve seat 31, the oil is not fed into the oil inlet throttling hole 32 any more, the oil drainage speed of the control cavity 6 reaches the maximum, and the oil injection speed reaches the maximum. In the whole oil injection process, high-pressure fuel oil always enters the oil cavity 33 formed by the valve seat 31 and the balance valve rod 39 through the hydraulic feedback oil channel 34, the oil drainage rate of the oil cavity 33 and the control cavity 6 is slowed down, the pressure drop of the control cavity 6 in the initial oil injection stage is reduced and slowed, and the generation of nitrogen oxides is reduced. And the hydraulic feedback oil channel 34 can accelerate the pressure building speed of the control cavity 6 at the end of oil injection, and the seating response of the needle valve body 8 is improved.
According to the working process, in the oil injection process of the electric control oil injector with the hydraulic feedback and the micro-dynamic oil return, a form of a two-position three-way valve is adopted, and the dynamic oil return amount of fuel oil in the oil injection process is reduced by balancing the oil inlet at the position of the valve rod 39 and the oil inlet in the middle block 37 through the electromagnetic valve. The whole oil injection process is controlled by an electromagnetic valve, and the electromagnetic force is utilized to drive the balance valve rod 39 to move, so that the requirements of high response speed, high control precision and variable oil injection rule in the oil injection process are met. The annular throttle belt 38 and the oil inlet orifice 32 at the conical surface of the balance valve rod are matched with the hydraulic feedback oil channel 34 to realize the variable oil injection rule from slow to fast at the beginning of oil injection and accelerate the seating response of the needle valve. The oil sprayer body 14 is internally provided with the flow limiting valve assembly 3, so that the abnormal oil spraying state is prevented from being continuously carried out, and the stability of the working process is ensured. When the common rail pressure storage cavity is applied to a common rail system, the pressure storage cavity 2 can effectively reduce the pressure fluctuation of the common rail under the large-oil-volume injection state, so that the phenomena of uniformity and stability reduction of the oil injection process of each cylinder are reduced.
Claims (2)
1. The utility model provides a take fine motion attitude oil return automatically controlled sprayer of hydraulic feedback which characterized by: the high-pressure fuel injection device comprises a fuel injector head, a fuel injector body, a flow limiting valve component, a solenoid valve component, a needle valve component and a downlink high-pressure oil way, wherein the fuel injector head is arranged above the fuel injector body, a main oil inlet is arranged in the fuel injector head, a pressure accumulation cavity is arranged in the fuel injector body, the main oil inlet is communicated with the pressure accumulation cavity, the flow limiting valve component is arranged in the pressure accumulation cavity, the solenoid valve component and the needle valve component are sequentially arranged at the lower end of the fuel injector body, a tightening cap is positioned outside the solenoid valve component and the needle valve component, and the upper end of the tightening cap is connected with the lower end of the fuel injector body in a threaded connection manner;
the flow limiting valve assembly comprises a limiting spring seat, a flow limiting piston, a ball valve reset spring seat and a supporting slide block, 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 assembly 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 upper cavity is formed between the middle part of the balance valve rod and the valve seat, an oil cavity is formed between the lower end part of the balance valve rod, the valve seat and the intermediate block, an oil inlet orifice is arranged in the valve seat, an oil return hole, an intermediate oil passage and a hydraulic feedback oil passage are arranged in the intermediate block, the oil inlet orifice is communicated with the balance valve rod upper cavity, the intermediate oil passage and the hydraulic feedback oil passage are respectively and directly communicated with or disconnected with the oil tank under the control of the balance valve rod; an annular throttle belt is arranged between the conical surface of the balance valve rod and the conical joint surface of the valve seat, the equivalent flow area of the annular throttle belt is A1, the effective flow area of the oil inlet throttle hole is A2, A1 is larger than A2 when the oil sprayer does not work, and A1 is continuously reduced until the equivalent flow area is 0 in the upward movement process of the balance valve rod; the needle valve assembly comprises a needle valve limiting sleeve, a nozzle and a needle valve body, the needle valve limiting sleeve is positioned in the nozzle, 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 the nozzle, a control cavity is formed between the upper part of the needle valve body and the needle valve limiting sleeve, a bulge is arranged on the needle valve limiting sleeve and positioned at the control cavity, a needle valve reset spring is arranged between the needle valve body and the bulge, the control cavity is communicated with a middle oil duct, 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 spray hole;
the upper end of the descending high-pressure oil way is communicated with a transition oil cavity and is communicated with an oil containing groove through an oil injector body, a valve seat, a middle block and a nozzle, and an oil inlet throttling hole and a hydraulic feedback oil channel are respectively communicated with the descending high-pressure oil way;
when the spray hole sprays oil, the fuel pressure of the transition oil cavity is reduced, the flow-limiting piston, the ball valve and the supporting slide block integrally move 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 slide block are integrally restored to the initial positions under the action of the ball valve return spring.
2. The electric control oil injector with hydrodynamic feedback and micro-dynamic oil return functions as claimed in claim 1, and is characterized in that: when the coil is electrified, the balance valve rod moves upwards, the upper cavity of the balance valve rod is in a disconnected state with the oil cavity, the oil return hole is in a communicated state with the oil tank, fuel oil in the control cavity returns to the oil tank through the middle oil duct and the oil return hole, the needle valve body is lifted upwards, and the spray 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 surface of the middle block, the upper cavity of the balance valve rod is communicated with the oil cavity, 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 oil inlet throttling hole, the upper cavity of the balance valve rod, the oil cavity and the middle oil duct on the one hand and enters the control cavity through the hydraulic feedback oil duct, the oil cavity and the middle oil duct on the other hand.
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| CN201710034600.3A CN106640453B (en) | 2017-01-18 | 2017-01-18 | Micro-dynamic oil return electric control oil injector with hydraulic feedback |
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| CN201710034600.3A CN106640453B (en) | 2017-01-18 | 2017-01-18 | Micro-dynamic oil return electric control oil injector with hydraulic feedback |
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| CN109595108B (en) * | 2018-12-03 | 2023-09-01 | 成都威特电喷有限责任公司 | Compact high-pressure fuel injection device |
| CN113074069B (en) * | 2021-05-14 | 2024-05-17 | 无锡威孚高科技集团股份有限公司 | Two-position three-way principle fuel injector |
| CN114076058A (en) * | 2021-12-15 | 2022-02-22 | 北油电控燃油喷射系统(天津)有限公司 | Large-flow oil injector with central solenoid valve |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104018966A (en) * | 2014-05-29 | 2014-09-03 | 哈尔滨工程大学 | Pressure accumulation flow-limiting type electromagnetic control oil sprayer |
| CN104912707A (en) * | 2015-06-23 | 2015-09-16 | 哈尔滨工程大学 | Bivalve-cooperated electromagnetic control oil spray device |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10333696A1 (en) * | 2003-07-24 | 2005-02-24 | Robert Bosch Gmbh | Fuel injector |
| DE102009039647A1 (en) * | 2009-09-01 | 2011-03-24 | Continental Automotive Gmbh | Fuel injector, particularly common rail fuel injector, for injecting fuel into combustion chamber of internal combustion engine, has servo valve that is controlled by piezoelectric actuator |
| 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 |
| CN104018964B (en) * | 2014-05-29 | 2016-05-04 | 哈尔滨工程大学 | Pressure accumulation current-limiting type piezoelectric control fuel injector |
| US10550808B2 (en) * | 2014-12-19 | 2020-02-04 | Volvo Truck Corporation | Injection system of an internal combustion engine and automotive vehicle including such an injection system |
| CN204458154U (en) * | 2015-03-09 | 2015-07-08 | 龙口龙泵燃油喷射有限公司 | A kind of pressure balance type common-rail injector |
| CN206352546U (en) * | 2017-01-18 | 2017-07-25 | 哈尔滨工程大学 | A kind of On Fluctuations oil return electric-controlled fuel injector with hydraulic feedback |
-
2017
- 2017-01-18 CN CN201710034600.3A patent/CN106640453B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104018966A (en) * | 2014-05-29 | 2014-09-03 | 哈尔滨工程大学 | Pressure accumulation flow-limiting type electromagnetic control oil sprayer |
| CN104912707A (en) * | 2015-06-23 | 2015-09-16 | 哈尔滨工程大学 | Bivalve-cooperated electromagnetic control oil spray device |
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