CN112901391A - Valve rod assembly, high-pressure fuel injection valve and engine electronic control fuel injection system - Google Patents
Valve rod assembly, high-pressure fuel injection valve and engine electronic control fuel injection system Download PDFInfo
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- CN112901391A CN112901391A CN202110250571.0A CN202110250571A CN112901391A CN 112901391 A CN112901391 A CN 112901391A CN 202110250571 A CN202110250571 A CN 202110250571A CN 112901391 A CN112901391 A CN 112901391A
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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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- 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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
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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
- F02M63/0028—Valves characterised by the valve actuating means hydraulic
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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
- F02M63/0028—Valves characterised by the valve actuating means hydraulic
- F02M63/0029—Valves characterised by the valve actuating means hydraulic using a pilot valve controlling a hydraulic chamber
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention relates to the technical field of high-pressure fuel injection valves, and discloses a valve rod assembly, which comprises: the utility model discloses a valve needle, including the valve plate, the valve needle is provided with the adjusting ring, the adjusting ring is provided with the reset spring, the adjusting ring is provided with the several passageway that is used for fuel circulation and throttle effect, the adjusting ring is provided with the reset spring down, the reset spring is provided with the adjusting ring down, the adjusting ring is provided with the reset spring down, the adjusting ring is provided with the adjusting ring down. Also disclosed is a high pressure fuel injection valve including the valve stem assembly described above. The electronic control fuel injection system of the engine comprises the high-pressure fuel injection valve. The technical problems of slowing down the opening speed of the control rod or the valve needle and speeding up the closing speed of the control rod or the valve needle are solved.
Description
Technical Field
The invention relates to the technical field of high-pressure fuel injection valves, in particular to a valve rod assembly, a high-pressure fuel injection valve and an engine electronic control fuel injection system.
Background
In the world, the pollutant emission of a power assembly becomes the focus of international social attention, and with the strictness of emission regulations, an engine electronic control fuel injection system capable of realizing high-pressure accurate control injection becomes the only technical route of a diesel engine technology. In order to effectively control the emission of pollutants, the opening and closing of the injection process needs to be accurately controlled, so that the injection waveform reaches a state of slow first and fast second, which is beneficial to the formation of more uniform combustible mixed gas by the engine, and has the effects of reducing oil consumption, reducing the emission of pollutants and improving the running noise of the engine. Most of high-pressure fuel injection valves are integrated or the control rod is connected with the valve needle through a connecting sleeve, the valve rod assembly of the structure moves upwards or downwards as a whole, the movement stress of the valve rod assembly is completely determined by the pressure of fuel in a control cavity and the spring force of an injection valve spring, and the requirements of smooth and slow opening and crisp closing of the fuel injection valve cannot be met.
Disclosure of Invention
The embodiment of the invention aims to provide a valve rod assembly, a high-pressure fuel injection valve and an engine electronic control fuel injection system, which aim to solve the technical problems of slowing down the opening speed of a piston rod or a valve needle and accelerating the closing speed of the piston rod or the valve needle.
In order to achieve the above purpose, the technical solution adopted by the embodiment of the present invention is as follows:
according to a first aspect of an embodiment of the present invention, there is provided a valve stem assembly, characterized by comprising: the utility model discloses a valve needle, including the valve plate, the valve needle is provided with the adjusting ring, the adjusting ring is provided with the reset spring, the adjusting ring is provided with the several passageway that is used for fuel circulation and throttle effect, the adjusting ring is provided with the reset spring down, the reset spring is provided with the adjusting ring down, the adjusting ring is provided with the reset spring down, the adjusting ring is provided with the adjusting ring down.
Furthermore, a valve plate middle hole is formed in the valve plate, the lower end of the control rod extends into the valve plate middle hole, the adjusting pad is located in the valve plate middle hole, and the valve plate middle hole, the adjusting pad and the third outer circular surface form an annular flow channel.
Further, the upper sleeve, the control rod and the valve plate jointly form a first coupling cavity, the lower sleeve, the valve needle and the valve plate jointly form a second coupling cavity, and the first coupling cavity and the second coupling cavity are separated by the annular flow channel.
Furthermore, an upper matching middle hole and a first coupling cavity hole are formed in the upper sleeve, the upper matching middle hole is connected with the upper plane of the upper sleeve or communicated with the upper plane of the upper sleeve through one-step or multi-step holes, and the first coupling cavity hole is communicated with the upper matching middle hole and the lower plane of the upper sleeve and has a diameter larger than that of the upper matching hole.
Furthermore, a lower matching middle hole and a second coupling cavity hole are formed in the lower sleeve, the lower matching middle hole is connected with the lower plane of the lower sleeve or communicated with the lower plane of the lower sleeve through one-order or multi-order holes, and the second coupling cavity hole is communicated with the lower matching middle hole and the upper plane of the lower sleeve, and is larger than the lower matching hole in diameter.
Further, the diameter of the upper mating center hole is larger than the diameter of the lower mating center hole.
Further, the whole length of the valve rod assembly is finely adjusted by adjusting the axial height of the adjusting pad, the upper return spring is adjusted by adjusting the axial thickness of the upper adjusting ring, and the spring force of the lower return spring is adjusted by adjusting the axial thickness of the lower adjusting ring.
Furthermore, the upper sleeve and the lower sleeve are respectively tightly attached and sealed with the upper end surface and the lower end surface of the valve plate.
According to a second aspect of the embodiments of the present invention, there is provided a high-pressure fuel injection valve, including a solenoid valve, a control sleeve, an injection valve spring, a valve rod assembly according to the first aspect, a housing, a nozzle tightening cap, and a valve body, where the solenoid valve, the control sleeve, the injection valve spring, and the control valve rod assembly are mounted on the housing from top to bottom, the valve body and the valve plate are sequentially fastened on a lower end surface of the housing by the nozzle tightening cap, an upper portion of the control rod is located in a control center hole of the control sleeve, the control sleeve abuts against a lower portion of the solenoid valve, the control sleeve, the solenoid valve, and the control rod together enclose to form a control chamber, and the control chamber is provided with an oil inlet communicated with high-pressure fuel, an oil outlet communicated with low-pressure fuel, and the solenoid valve is capable of.
According to a third aspect of the embodiments of the present invention, there is provided an engine electrically-controlled fuel injection system including the high-pressure fuel injection valve of the second aspect.
According to the technical scheme, the upper adjusting ring, the upper return spring, the upper sleeve, the valve plate, the adjusting pad, the lower sleeve, the lower return spring and the lower adjusting ring are arranged between the control rod and the valve needle to form the coupling cavity together, and the valve plate is provided with the passage with the throttling function to throttle the fuel to generate the pressure difference. The control rod is additionally subjected to hydraulic pressure generated by coupling cavity hydraulic pressure and throttling pressure difference when moving upwards and downwards, so that the requirements of smooth and slow opening and crisp closing of the fuel injection valve are met. Meanwhile, the fuel in the coupling cavity can buffer the collision of the moving parts, and the service life is prolonged.
Through the technical scheme of the invention, the opening speed of the piston rod or the valve needle can be slowed down, the pre-injection effect is more favorably improved, the combustion process is optimized, and the pollutant emission, particularly the proportion of NOx, is reduced; the closing speed of the piston rod or the valve needle is accelerated, so that the injection is quickly finished, the injection quantity of low-pressure fuel at the later stage of injection is greatly reduced, poor combustion is controlled, and the pollutant emission, particularly the proportion of PM, is reduced; the impact load of the valve body, the valve needle, the control rod and the adjusting pad is reduced, and the reliability is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. It is to be understood that the drawings in the following description are illustrative of specific embodiments described herein and are not to be construed as limiting the scope of the invention. It is of course possible for a person skilled in the art, without inventive effort, to derive from the following embodiments of the invention and the figures thereof some further embodiments and figures
FIG. 1 is a schematic illustration of a valve stem assembly according to an embodiment of the present invention, the schematic illustration being a partial enlarged view of FIG. 7A;
FIG. 2 is a schematic structural view of an upper sleeve provided in accordance with an embodiment of the present invention;
FIG. 3 is a schematic structural view of a lower sleeve provided in accordance with an embodiment of the invention;
FIG. 4 is a schematic structural diagram of a control lever provided in accordance with one embodiment of the present invention;
figure 5 is a schematic structural view of a valve needle provided in accordance with an embodiment of the invention;
FIG. 6 is a schematic structural view of a valve plate provided in accordance with an embodiment of the invention;
FIG. 7 is a schematic structural diagram of a high pressure fuel injection valve provided in accordance with an embodiment of the present invention;
fig. 8 is a partially enlarged structural view of a portion a in fig. 7.
In the figure: 110-a solenoid valve; 120-a control sleeve; 130-injection valve spring 140-high pressure chamber; 150-a housing; 160-nozzle cap tightening; 170-a valve body; 180-oil outlet; 190-oil inlet hole; 210-a control chamber; 201-upper adjusting ring; 202-upper return spring; 203-adjusting pad; 204-a valve plate; 205-a lower sleeve; 206-lower adjustment loop; 207-valve needle; 208-lower return spring; 209-a second coupling cavity; 210-a control chamber; 211 an annular flow passage; 212-first coupling cavity; 213-upper sleeve; 214-a control lever; 215-a first outer circular surface; 216-control bar scapula; 217-a third outer circular surface; 218-a second outer circular surface; 219-scapular surface of valve needle; 221-a first coupling cavity aperture; 222-upper mating mesopores; 223-lower mating middle hole; 224-a second coupling cavity aperture; 225-channel; 226-holes in the valve plate.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It should be understood that the terms first, second, third and the like may be used herein to describe various elements, these terms are only used to distinguish one element from another.
FIG. 1 is a schematic illustration of a valve stem assembly provided in accordance with an embodiment of the present invention; an embodiment of the present invention provides a valve stem assembly that may be used in a high pressure fuel injection valve, and may include: the adjustable valve comprises a control rod 214, an upper adjusting ring 201, an upper return spring 202, an upper sleeve 213, a valve plate 204, an adjusting pad 203, a lower sleeve 205, a lower return spring 208, a lower adjusting ring 206 and a valve needle 207, wherein the upper adjusting ring 201, the upper return spring 202 and the upper sleeve 213 are sequentially sleeved on the control rod 214 from top to bottom, the lower sleeve 205, the lower return spring 208 and the lower adjusting ring 206 are sequentially sleeved on the valve needle 207 from top to bottom, the upper sleeve 213 and the lower sleeve 205 are respectively abutted against the upper end surface and the lower end surface of the valve plate 204, the upper surface and the lower surface of the adjusting pad 203 are respectively abutted against the control rod 214 and the valve needle 207, and the valve plate 204 is provided with one or a plurality of channels 225 for fuel circulation and throttling.
According to the prior art, when the electromagnetic valve is electrified to open the oil outlet hole to enable the control chamber to be communicated with the low-pressure fuel, the high-pressure fuel flows out of the oil outlet hole, the pressure intensity of the fuel in the control chamber is reduced, and the control rod, the connecting sleeve and the valve needle or the integrated valve needle overcome the spring force of the injection valve spring to lift together under the action of hydraulic pressure. After the current of the electromagnetic valve is cut off, the oil outlet hole is closed, the control chamber and the low fuel are separated, the fuel pressure of the control chamber is increased and balanced with the fuel pressure of the high pressure cavity, and the spring force action of the injection valve enables the control rod and the valve needle to descend. In summary, the upward and downward movements of the control rod and the valve needle are controlled only by the hydraulic pressure of the control chamber and the spring force of the injection valve, and the control mode cannot fully meet the requirements of smooth and slow opening and crisp closing of the fuel injection valve.
In contrast, in the embodiment of the present invention, an upper adjusting ring 201, an upper return spring 202, an upper sleeve 213, a valve plate 204, an adjusting pad 203, a lower sleeve 205, a lower return spring 208, and a lower adjusting ring 206 are disposed between a control rod 214 and a valve needle 207, which together form a coupling chamber, and a passage having a throttling function is disposed in the valve plate 204 to throttle fuel to generate a pressure difference. The control rod 214 is additionally subjected to hydraulic pressure generated by coupling cavity hydraulic pressure and throttling differential pressure when moving upwards and downwards, so that the requirements of smooth and slow opening and crisp closing of the fuel injection valve are met. Meanwhile, the fuel in the coupling cavity can buffer the collision of the moving parts, and the service life is prolonged.
According to the invention, when the electromagnetic valve is electrified to open the oil outlet, the electromagnetic valve is electrified to open the oil outlet to enable the control chamber to be communicated with low-pressure fuel, the high-pressure fuel flows out from the oil outlet, the pressure of the fuel in the control chamber is reduced, the control rod 214 overcomes the spring force of the injection valve spring to move upwards under the action of hydraulic pressure, at the moment that the control rod 214 rises, the volume of the coupling cavity is increased, the pressure of the fuel is reduced, and the valve needle 207 and the adjusting pad 203 move upwards along with the control rod 214 under the action of hydraulic. At this time, the control rod 214, the valve needle 207 and the adjusting pad 203 move upwards relatively to the upper sleeve 213, the valve plate 204 and the lower sleeve 205, and since the diameter of the upper matching middle hole is larger than that of the lower matching middle hole, the total volume of the coupling cavity is increased, and the fuel pressure in the cavity is further reduced relative to that of the high-pressure cavity. And because the diameter of the upper matching middle hole is larger than that of the lower matching middle hole, and the fuel pressure in the coupling cavity is lower than that of the high-pressure cavity, the resultant force of the generated fuel pressure difference acting on the hydraulic forces of the control rod 214 and the valve needle 207 is downward. Meanwhile, during the continuous injection process of the valve needle 207 to the fuel injection valve separated from the valve body, the fuel flows through the passage to generate a throttling effect, the fuel pressure at the upper part of the valve plate 204 is higher than the fuel pressure at the lower part of the valve plate 204, and the pressure difference generates downward hydraulic force on the control rod 214, the adjusting pad 203 and the valve needle 207 integrally. The two hydraulic pressures reduce the upward force exerted on the control rod 214, the adjusting pad 203 and the valve needle 207, and the upward movement of the control rod 214, the adjusting pad 203 and the valve needle 207 is slowed down, so that the purpose of slowly opening the high-pressure fuel injection valve is realized.
When the electromagnetic valve is electrified to close the oil outlet, the control cavity is refilled with high-pressure fuel, and the fuel pressure of the control cavity is balanced with the fuel pressure of the high-pressure cavity. Since the increased volume of the coupling chamber cannot be filled completely with leaked fuel, the fuel pressure in the coupling chamber is still lower than the fuel pressure in the high pressure chamber and the control chamber, and thus the resultant of the hydraulic forces of the coupling chamber on the control rod 214 and the needle 207 is still downward. Meanwhile, the fuel injection valve continuously injects until the valve needle 207 is abutted against the valve body again, hydraulic pressure generated by channel throttling still exists in the continuous fuel injection process, and the control rod 214, the adjusting pad 203 and the valve needle 207 move downwards under the combined action of the downward spring force of the injection valve spring, the hydraulic pressure generated by throttling and the downward hydraulic pressure of the coupling cavity, and compared with the movement speed under the action of the spring force, the movement speed is higher, so that the purpose of quickly closing the high-pressure fuel injection valve is achieved.
In the embodiment of the invention, because the fuel pressure in the coupling cavity is reduced in the process of lifting the valve needle 207 and the control rod 214, a small amount of fuel in the high-pressure cavity of the injection valve leaks into the coupling cavity. Therefore, the space between the needle 207 and the adjusting pad 203 or between the control rod 214 and the adjusting pad 203 is filled with surplus fuel oil at the end of the descending process of the needle 207 and the control rod 214, and the space is in a separated state, at the moment that the needle 207 impacts the valve body, the control rod 214, the needle 207 and the adjusting pad 203 are not in direct contact, and the fuel between the control rod 214 and the adjusting pad 203 plays a buffer role, so that the abrasion of the valve body, the needle 207, the control rod 214 and the adjusting pad 203 can be reduced. In the buffering process, the fuel pressure in the coupling cavity is increased, as the diameter of the lower coupling cavity is larger than that of the lower matching hole and the diameter of the upper coupling cavity is larger than that of the upper matching hole, hydraulic pressure acts on the upper sleeve 213 and the lower sleeve 205 to force the upper sleeve 213 and the lower sleeve 205 to be separated from the valve plate 204, and redundant fuel oil flows out of the coupling cavity through the separated gap, so that the maximum impact force of the nozzle needle 207 on the valve body is controlled. Then, the upper sleeve 213 and the lower sleeve 205 are again abutted against the valve plate 204 by the upper return spring 202 and the lower return spring 208, and are ready for the next movement.
Specifically, with reference to fig. 1-6, the upper adjustment ring 201 is positioned between the lever shoulder blade 216 and the upper return spring 202, and the first outer circular surface 215 of the lever 214 is positioned in the upper mating central bore 222 of the upper sleeve 213. The second outer circular surface 218 of the valve needle 207 is located in the lower mating central bore 223 of the lower sleeve 205 and the lower adjustment ring 206 is located between the valve needle shoulder surface 219 and the lower return spring 208. The upper sleeve 213 and the lower sleeve 205 are respectively abutted against the upper and lower end faces of the valve plate 204, and the upper and lower faces of the adjustment pad 203 are respectively abutted against the control rod 214 and the valve needle 207. A third outer circular surface 217 is provided on the lower portion of the first outer circular surface 215 of the control rod 214 or on the upper portion of the second outer circular surface 218 of the valve needle 207. The third outer circular surface 217 is located in the valve plate central hole 226, and forms an annular flow passage 211 together with the adjusting pad 203 and the valve plate central hole 226. The upper return spring 202 is located above the upper sleeve 213 and abuts against the upper end surface of the upper sleeve 213 and the upper adjustment ring 201. The lower return spring 208 is located at the lower part of the lower sleeve 205 and abuts against the lower end surface of the lower sleeve 205 and the lower adjusting ring 206. The upper sleeve 213, the control rod 214 and the valve plate 204 together form a first coupling cavity 212, the lower sleeve 205, the valve needle 207 and the valve plate 204 together form a second coupling cavity 209, the first coupling cavity 212 and the second coupling cavity 209 are separated by the annular flow passage 211, and the first coupling cavity 212 and the second coupling cavity 209 are collectively called a coupling cavity.
The control rod 214 and valve needle 207 move more slowly in the upward direction and more rapidly in the downward direction due to the additional hydraulic pressure provided to the valve stem assembly by the coupling cavity during the upward and downward movements of the control rod 214. The slow-rising and rapid-falling motion characteristics can realize the speed reduction of the rising section of the fuel injection rate and the speed acceleration of the falling section of the fuel injection rate. The injection process is beneficial to the formation of more uniform combustible mixed gas for the engine, and has the effects of reducing oil consumption, reducing pollutant discharge and improving the running noise of the engine.
Referring to fig. 1 and 2, in this embodiment, an upper fitting middle hole 222 and a first coupling cavity hole 221 are further formed in the upper sleeve 213, the upper fitting middle hole 222 may be directly connected to the upper plane of the upper sleeve 213, or may be communicated with the upper plane of the upper sleeve 213 through one or more holes, and the first coupling cavity hole 221 is communicated with the upper fitting middle hole 222 and the lower plane of the upper sleeve 213, and has a diameter larger than that of the upper fitting hole.
Referring to fig. 1 and 3, in this embodiment, a lower fitting middle hole 223 and a second coupling cavity hole 224 are formed in the lower sleeve 205, the lower fitting middle hole 223 may be directly connected to the lower plane of the lower sleeve 205, or may be communicated with the lower plane of the lower sleeve 205 through one-step or multi-step holes, and the second coupling cavity hole 224 is communicated with the lower fitting middle hole 223 and the upper plane of the lower sleeve 205, and has a diameter larger than that of the lower fitting hole.
Referring to fig. 1, in the present embodiment, the diameter of the upper fitting center hole 222 should be larger than the diameter of the lower fitting center hole 223.
Referring to FIG. 1, in this embodiment, the overall length of the stem assembly is fine tuned by adjusting the axial height of the adjustment pad 203. The axial thickness of the upper and lower adjusting rings 201, 206 can be used to adjust the spring force of the upper and lower return springs 202, 208.
Referring to fig. 1, in this embodiment, the flat surfaces between the upper sleeve 213, the lower sleeve 205 and the valve plate 204 have high surface quality and are closely fitted and sealed.
There is also provided a high pressure fuel injection valve according to an embodiment of the present invention, referring to fig. 7, including a solenoid valve 110, a control sleeve 120, an injection valve spring 130, the above-mentioned valve stem assembly, a housing 150, a nipple cap 160, a valve body 170, the solenoid valve 110, the control sleeve 120, the injection valve spring 130 and the control valve stem assembly are mounted on the housing 150 from top to bottom, the valve body 170 and the valve plate 204 are fastened on the lower end surface of the shell 150 by the oil nozzle tight cap 160 in sequence, the control rod 214 is located at the upper portion thereof in the control center hole of the control sleeve 120, the control sleeve 120 abuts against the lower portion of the solenoid valve 110, the control sleeve 120, the solenoid valve 110 and the control rod 214 together enclose a control chamber 210, the control chamber 210 is provided with an oil inlet hole 190 communicating with high-pressure fuel, an oil outlet hole 180 communicating with low-pressure fuel, and the oil outlet hole 180 can be opened or closed by the electromagnetic valve 110.
As shown in fig. 1, the high-pressure fuel valve is provided with a high-pressure chamber 140, the high-pressure chamber 140 being enclosed by the solenoid valve 110, the housing 150, the valve plate 204, and the valve body 170, the valve body 170 and the valve plate 204 being fixed to a lower portion of the housing 150 by the nipple cap 160, and the control rod 214, the adjustment pad 203, and the valve needle 207 being longitudinally movably disposed in the high-pressure chamber 140. Valve body 170 extends deep into the engine combustion chamber to perform the injection function. An injection valve spring 130 is provided between the control sleeve 120 and the control rod 214, and the injection valve spring 130 applies a spring force to the control sleeve 120 and the valve stem assembly, respectively, which spring force presses the control sleeve 120 against the lower end of the solenoid valve 110, and presses the valve needle 207 into the valve body 170 by acting on the valve needle 207 through the control rod 214 and the adjustment pad 203.
The high-pressure chamber 140 of the high-pressure fuel injection valve is filled with fuel under high pressure compressed by a high-pressure oil pump (not shown). This high-pressure fuel is supplied to the high-pressure fuel injection valve high-pressure chamber 140 directly or after pressure accumulation through a common rail. This high pressure fuel is present throughout the high pressure chamber 140, the valve needle 207 in the high pressure chamber 140 being subjected to an upward hydraulic force, and the control rod 214 being located at its upper end in the control chamber 210, the high pressure fuel in the control chamber 210 subjecting the control rod 214 to a downward hydraulic force. While control lever 214 is spring-loaded by downward injection valve spring 130. When the control rod 214, the adjustment pad 203, and the needle 207 are subjected to a lower upward force than a downward force, the needle 207 presses against the sealing seat surface of the valve body 170 and no fuel injection event occurs. When the control rod 214, the adjustment pad 203, and the valve needle 207 are subjected to an upward force in combination with a downward force, the valve needle 207 moves upward away from the sealing seating surface of the valve body 170 and a fuel injection event occurs.
The valve rod assembly provided by the invention realizes the adjustment of the stress of the piston rod in the ascending motion and the descending motion by arranging the coupling cavity, thereby realizing the requirements of smooth and slow opening and convenient and crisp closing of the fuel injection valve, simultaneously buffering the collision of a moving part and prolonging the service life.
When the high-pressure fuel injection valve does not work, the solenoid valve 110 does not receive working current, the solenoid valve 110 closes the oil outlet hole 180, so that the fuel pressures of the high-pressure chamber 140 and the control chamber 210 are consistent, and the fuel pressure is set by the system at the moment. The needle 207, the control rod 214 and the adjusting pad 203 are all forced downward by the force of the injection valve spring 130 and the hydraulic force, and the needle 207 is pressed against the sealing seat surface of the valve body 170, and no fuel injection process occurs.
When the high-pressure fuel injection valve is operated, the electromagnetic valve 110 receives an operating current, the electromagnetic valve 110 opens the oil outlet hole 180, fuel starts to flow out from the oil outlet hole 180, and fuel in the high-pressure chamber 140 flows into the control chamber 210 through the oil inlet hole 190. Referring to fig. 7 and 8, the control rod 214 moves upward against the spring force of the injection valve spring 130 by hydraulic pressure when the fuel pressure drops to a certain level due to the fuel pressure drop in the control chamber 210 by the throttling action of the oil inlet hole 190 and the oil outlet hole 180. At the moment when the control rod 214 rises, the volume of the first coupling cavity 212 increases, the fuel pressure drops, part of the fuel in the second coupling cavity 209 flows into the first coupling cavity 212 through the annular flow passage 211, the fuel pressure in the second coupling cavity 209 drops, the valve needle 207 starts to move upwards along with the control rod 214 under the action of hydraulic pressure, the valve needle 207 is separated from the valve body 170, and the injection valve starts to inject. Thereafter, fuel in the upper portion of the valve plate 204 in the high pressure chamber 140 flows through the passage 225 into the lower high pressure chamber 140 of the valve plate 204, and then into the valve body 170 and is ejected out of the high pressure chamber 140. The fuel flowing through the channel 225 creates a throttling effect, which forces the pressure of the fuel in the high-pressure chamber 140 below the valve plate 204 to be slightly lower than the pressure of the fuel in the high-pressure chamber 140 above the valve plate 204, and the pressure difference of the fuel additionally creates a downward hydraulic force on the valve needle 207, the adjusting pad 203 and the control rod 214 as a whole. After that, because the upper sleeve 213 and the lower sleeve 205 are abutted to the upper end surface and the lower end surface of the valve plate 204 by the upper return spring 202 and the lower return spring 208 and are limited to move, at this time, the control rod 214, the valve needle 207 and the adjusting pad 203 relatively move upwards relative to the upper sleeve 213 and the lower sleeve 205, the volume of the first coupling cavity 212 continues to increase, the volume of the second coupling cavity 209 decreases, the fuel in the second coupling cavity 209 flows into the first coupling cavity 212 through the annular flow passage 211, and the fuel pressure in the first coupling cavity 212 is lower than or equal to the fuel pressure in the second coupling cavity 209 due to the throttling effect of the annular flow passage 211 on the fuel. Meanwhile, the diameter of the upper matching middle hole 222 is larger than that of the lower matching middle hole 223, the total volume of the coupling cavities is increased, and the fuel pressure in the first coupling cavity 212 and the second coupling cavity 209 is further reduced relative to the fuel pressure in the high-pressure cavity 140. And since the upper mating center hole 222 is larger in diameter than the lower mating center hole 223, a downward hydraulic force is generated on the control rod 214 and the valve needle 207. Under the influence of the coupling cavity hydraulic pressure and the hydraulic pressure generated by throttling, the upward movement of the control rod 214, the adjusting pad 203 and the valve needle 207 is slowed down integrally, so that the aim of slowly opening the high-pressure fuel injection valve is fulfilled.
According to the invention, when the electromagnetic valve 110 is electrified to close the oil outlet hole 180, the oil inlet hole 190 continues to flow fuel into the control cavity 210, and when the fuel pressure in the control cavity 210 reaches a certain pressure, the control rod 214, the adjusting pad 203 and the valve needle 207 are wholly subjected to downward resultant force to move downwards. Since the increased volume of the coupling chamber cannot be completely filled with leaked fuel, and the absolute pressure in the coupling chamber is still lower than the fuel pressure in the high-pressure chamber 140 and the control chamber 210, the resultant of the coupling chamber hydraulic pressures applied to the control rod 214 and the needle 207 is still downward, and the high-pressure injection valve continues to inject, and the stem, the adjusting pad 203 and the needle 207 are still subjected to the above-mentioned throttle hydraulic pressure. The control rod 214 and the valve needle 207 move downwards under the combined action of the downward spring force of the injection valve spring 130, the coupling chamber hydraulic pressure and the throttle hydraulic pressure, and the movement speed is higher than that under the action of the spring force only, so that the purpose of 'quick closing' of the high-pressure fuel injection valve is achieved.
Since the fuel pressure in the coupling chamber drops during the overall raising of the control rod 214, the adjusting pad 203 and the needle 207, a small amount of fuel in the injection valve high pressure chamber 140 leaks into the coupling chamber. Therefore, at the end of the overall descending process of the control rod 214, the adjusting pad 203 and the valve needle 207, the valve needle 207 and the adjusting pad 203 or the space between the control rod 214 and the adjusting pad 203 are filled with surplus fuel oil and are in a separated state, at the moment when the valve needle 207 impacts the valve body 170, the control rod 214, the valve needle 207 and the adjusting pad 203 are not in direct contact, and the fuel between the control rod 214, the valve needle 207, the control rod 214 and the adjusting pad 203 plays a role in buffering, so that the abrasion of the valve body 170, the valve needle 207, the control rod 214 and the adjusting. During the buffering process, the fuel pressure in the coupling cavity rises, hydraulic pressure acts on the upper sleeve 213 and the lower sleeve 205 to force the upper sleeve 213 and the lower sleeve 205 to separate from the valve plate 204 against the acting forces of the upper return spring 202 and the lower return spring 208, respectively, and excess fuel flows out of the coupling cavity through the separated gaps, so that the maximum impact force of the nozzle needle 207 on the valve body 170 is controlled. Then, the upper sleeve 213 and the lower sleeve 205 are again abutted against the valve plate 204 by the upper return spring 202 and the lower return spring 208, and are ready for the next movement.
According to an embodiment of the present invention, there is also provided an engine electronic control fuel injection system, including the above-mentioned high-pressure fuel injection valve, which has all the effects of the above-mentioned high-pressure fuel injection valve, and will not be described herein again.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (10)
1. A valve stem assembly, comprising: the utility model discloses a valve needle, including the valve plate, the valve needle is provided with the adjusting ring, the adjusting ring is provided with the reset spring, the adjusting ring is provided with the several passageway that is used for fuel circulation and throttle effect, the adjusting ring is provided with the reset spring down, the reset spring is provided with the adjusting ring down, the adjusting ring is provided with the reset spring down, the adjusting ring is provided with the adjusting ring down.
2. A valve stem assembly as defined in claim 1, wherein: the valve plate is provided with a valve plate middle hole, the lower end of the control rod extends into the valve plate middle hole, the adjusting pad is located in the valve plate middle hole, and the valve plate middle hole, the adjusting pad and the third outer circular surface form an annular flow channel.
3. A valve stem assembly as defined in claim 2, wherein: the upper sleeve, the control rod and the valve plate jointly form a first coupling cavity, the lower sleeve, the valve needle and the valve plate jointly form a second coupling cavity, and the first coupling cavity and the second coupling cavity are separated by the annular flow channel.
4. A valve stem assembly as defined in claim 1, wherein: the upper sleeve is internally provided with an upper matching middle hole and a first coupling cavity hole, the upper matching middle hole is connected with the upper plane of the upper sleeve or communicated with the upper plane of the upper sleeve through one-step or multi-step holes, and the first coupling cavity hole is communicated with the upper matching middle hole and the lower plane of the upper sleeve and has a diameter larger than that of the upper matching hole.
5. A valve stem assembly as defined in claim 4, wherein: the lower sleeve is internally provided with a lower matching middle hole and a second coupling cavity hole, the lower matching middle hole is connected with the lower plane of the lower sleeve or communicated with the lower plane of the lower sleeve through one-step or multi-step holes, and the second coupling cavity hole is communicated with the lower matching middle hole and the upper plane of the lower sleeve, and has a diameter larger than that of the lower matching hole.
6. A valve stem assembly as defined in claim 5, wherein: the diameter of the upper fitting center hole is larger than that of the lower fitting center hole.
7. A valve stem assembly as defined in claim 1, wherein: the whole length of the valve rod assembly is finely adjusted by adjusting the axial height of the adjusting pad, the upper return spring is adjusted by adjusting the axial thickness of the upper adjusting ring, and the spring force of the lower return spring is adjusted by adjusting the axial thickness of the lower adjusting ring.
8. A valve stem assembly as defined in claim 1, wherein: the upper sleeve and the lower sleeve are respectively tightly attached and sealed with the upper end surface and the lower end surface of the valve plate.
9. A high-pressure fuel injection valve characterized in that: including solenoid valve, control sleeve, injection valve spring, the tight cap of valve rod assembly, casing, glib talker, valve body of any of claims 1-8, solenoid valve, control sleeve, injection valve spring and control valve rod assembly from last to installing on the casing, valve body, valve plate are fastened on terminal surface under the casing by glib tight cap in proper order, control lever upper portion is located in control telescopic control mesopore, control sleeve with solenoid valve lower part looks butt, control sleeve, solenoid valve, control lever enclose jointly and close and constitute the control chamber, the control chamber be provided with high-pressure fuel UNICOM's inlet port, with low-pressure fuel UNICOM's oil outlet, the solenoid valve can open or close the oil outlet.
10. An engine electronic control fuel injection system characterized by comprising the high-pressure fuel injection valve according to claim 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110250571.0A CN112901391A (en) | 2021-03-08 | 2021-03-08 | Valve rod assembly, high-pressure fuel injection valve and engine electronic control fuel injection system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110250571.0A CN112901391A (en) | 2021-03-08 | 2021-03-08 | Valve rod assembly, high-pressure fuel injection valve and engine electronic control fuel injection system |
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| CN112901391A true CN112901391A (en) | 2021-06-04 |
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| CN202110250571.0A Pending CN112901391A (en) | 2021-03-08 | 2021-03-08 | Valve rod assembly, high-pressure fuel injection valve and engine electronic control fuel injection system |
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| CN214577486U (en) * | 2021-03-08 | 2021-11-02 | 上海钧风电控科技有限公司 | Valve rod assembly, high-pressure fuel injection valve and engine electronic control fuel injection system |
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| US5727738A (en) * | 1994-11-10 | 1998-03-17 | Robert Bosch Gmbh | Fuel injection valve for internal combustion engines |
| JP2000002164A (en) * | 1998-06-16 | 2000-01-07 | Nippon Soken Inc | Pressure accumulating type fuel injection device |
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Effective date of registration: 20230525 Address after: 225500 No. 1, Shuguang Middle Road, Baimi Town, Jiangyan District, Taizhou City, Jiangsu Province Applicant after: Junfeng electric control technology (Taizhou) Co.,Ltd. Address before: Room 211, building 21, 1158 Jiuting Central Road, Jiuting Town, Songjiang District, Shanghai, 201615 Applicant before: Shanghai Junfeng Electric Control Technology Co.,Ltd. |
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