CN114017221A - Electric control oil injector - Google Patents
Electric control oil injector Download PDFInfo
- Publication number
- CN114017221A CN114017221A CN202111410911.8A CN202111410911A CN114017221A CN 114017221 A CN114017221 A CN 114017221A CN 202111410911 A CN202111410911 A CN 202111410911A CN 114017221 A CN114017221 A CN 114017221A
- Authority
- CN
- China
- Prior art keywords
- oil
- rack
- cavity
- needle valve
- oil duct
- 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.)
- Granted
Links
- 230000007246 mechanism Effects 0.000 claims abstract description 37
- 230000001105 regulatory effect Effects 0.000 claims abstract description 19
- 239000003921 oil Substances 0.000 claims description 197
- 239000000446 fuel Substances 0.000 claims description 36
- 239000000295 fuel oil Substances 0.000 claims description 24
- 230000008878 coupling Effects 0.000 claims description 12
- 238000010168 coupling process Methods 0.000 claims description 12
- 238000005859 coupling reaction Methods 0.000 claims description 12
- 239000007921 spray Substances 0.000 claims description 4
- 238000005507 spraying Methods 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 8
- 230000035945 sensitivity Effects 0.000 abstract description 7
- 238000002347 injection Methods 0.000 description 14
- 239000007924 injection Substances 0.000 description 14
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 3
- 230000035484 reaction time Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle 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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses an electric control oil injector, which comprises an oil injector body, a needle valve stroke limiting disc, a needle valve matching part, a nozzle tightening cap, an ejector rod and a pressure regulating spring, wherein the ejector rod and the pressure regulating spring are arranged in the oil injector body and the needle valve stroke limiting disc, and a thrust block, a rack regulating mechanism and an electromagnetic valve element are arranged in the oil injector body. The rack adjusting mechanism comprises a rack and a rack bar. The rack is connected with the electromagnetic valve element through threads, and the electromagnetic valve element can control the rack to reciprocate. The rack rod is meshed with the rack, and the rack drives the rack rod to rotate to control the opening and closing of the oil inlet hole of the oil sprayer so as to control oil spraying. The electric control oil sprayer provided by the invention has a simple structure, is easy to process, adopts the electromagnetic valve element to control the rack adjusting mechanism so as to control the oil spraying mode, and improves the control sensitivity of the oil sprayer.
Description
Technical Field
The invention relates to an electric control oil injector, and belongs to the technical field of marine diesel engines.
Background
With stricter emission regulations, the requirements of the marine diesel engine on the fuel injection system are higher, and in order to meet the requirements of the diesel engine, the high-pressure common rail system gradually becomes the development direction of the fuel injection system of the future diesel engine. The electronic control fuel injector is one of important parts of a high-pressure common rail system, and can inject high-pressure fuel into a cylinder in a timing and quantitative mode. The control system, which is the core of the electrically controlled fuel injector, usually includes at least a solenoid valve element, a metering orifice structure and a fuel chamber, and controls the opening and closing of the needle valve matching part by using the oil pressure change of the fuel in the fuel chamber. However, the control system has the advantages that on one hand, the measuring hole is difficult to process, the qualified rate is low, the consistency of the oil injection quantity of the oil injector is difficult to ensure, and the cost is high; on the other hand, the electromagnetic valve element realizes the control mode of indirectly controlling the needle valve matching part through fuel, and the fuel in the fuel chamber is pressurized or decompressed through the through hole in a certain time, so that the control sensitivity is adversely affected. Therefore, there are many places where further improvement is needed in the conventional electrically controlled fuel injector technology, and new technologies need to be researched to meet the development requirements of diesel engines.
Disclosure of Invention
In order to solve the problems that the conventional electronic control oil sprayer metering orifice structure is difficult to process, the consistency of the oil spraying quantity of the oil sprayer is difficult to ensure, and the control sensitivity of the oil sprayer is insufficient, the invention provides the electronic control oil sprayer which is simple in structure and easy to process, and adopts an electromagnetic valve element to control a rack adjusting mechanism so as to control the oil spraying mode, thereby shortening the reaction time and improving the control sensitivity of the oil sprayer.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention provides an electric control oil injector, which comprises: the oil injector body, the needle valve stroke limiting disc and the needle valve coupling are connected in sequence;
the surface of the oil injector body is provided with a low-pressure cavity; a first cavity, a second cavity, a third cavity and a fourth cavity are formed in the oil sprayer body; a first oil duct communicated with the fourth cavity is arranged on the outer wall of the oil injector, and a second oil duct communicated with the fourth cavity, a third oil duct communicated with the second oil duct and a fourth oil duct communicated with the third cavity are arranged in the oil injector body; the third oil duct is communicated with the third cavity, and the fourth oil duct is communicated with the low-pressure cavity; a fifth oil duct communicated with the second oil duct is arranged in the needle valve stroke limiting disc, and a sixth oil duct communicated with the fifth oil duct is arranged in the needle valve coupling part; a fifth cavity is formed in the needle valve stroke limiting disc;
a solenoid valve element mounted within the second cavity; a rack adjustment mechanism driven by the solenoid valve element; the rack adjusting mechanism is arranged in the third cavity and the fourth cavity;
the thrust block and the pressure regulating spring are arranged in the first cavity;
a push rod arranged in the fifth cavity; the pressure regulating spring is limited between the thrust block and the ejector rod;
when the electromagnetic valve element drives the rack adjusting mechanism to move to a preset first position, the rack adjusting mechanism blocks the third oil duct, high-pressure fuel oil flows into the second oil duct through a space formed among the first oil duct, the rack adjusting mechanism and the cavity wall of the fourth cavity and then flows into the needle valve matching part through the fifth oil duct, the high-pressure fuel oil flowing into the needle valve matching part pushes the needle valve to move, the ejector rod is pushed to compress the pressure regulating spring, the needle valve matching part is opened, and the high-pressure fuel oil is sprayed out through an oil injection hole in the end part of the needle valve matching part;
when the electromagnetic valve element drives the rack adjusting mechanism to move to a preset second position, the rack adjusting mechanism blocks the second oil duct, and the pressure regulating spring rebounds to close the needle valve matching part, so that the oil injector stops injecting oil; meanwhile, the rack adjusting mechanism conducts the third oil duct, and residual high-pressure fuel oil in the oil injector flows to the low-pressure cavity through the third oil duct and the fourth oil duct, so that pressure relief of the residual high-pressure fuel oil is realized.
Preferably, the rack adjustment mechanism includes: a rack and pinion;
the rack is arranged in the third cavity, a threaded mounting hole is formed in one end of the rack, the rack is fixedly connected with the electromagnetic valve element through the threaded mounting hole, a first annular groove is formed in the outer circumference of one end, away from the threaded mounting hole, of the rack, and teeth are arranged on the outer surface of the rack along the axial direction of the rack;
the toothed bar is arranged in the fourth cavity, a gear meshed with the teeth is arranged on the outer circumference of the toothed bar, a second annular groove is arranged on the outer circumference of one end, far away from the gear, of the toothed bar, two opposite flat areas are formed in the area, located between the gear and the second annular groove, of the toothed bar, and the two flat areas are communicated through two cylindrical surfaces;
when the electromagnetic valve element drives the rack adjusting mechanism to move to a preset first position, the rack blocks the third oil duct, a gap is formed between one of the flat areas of the rack bar and the second oil duct, a gap is formed between the other flat area of the rack bar and the first oil duct, and high-pressure fuel sequentially flows into the second oil duct through the first oil duct, the gap formed between the other flat area of the rack bar and the first oil duct, the second ring groove and the gap formed between the one of the flat areas of the rack bar and the second oil duct, and then flows into the needle valve coupling piece through the fifth oil duct;
when the electromagnetic valve element drives the rack adjusting mechanism to move to a preset second position, one cylindrical surface of the rack bar blocks the second oil duct, and the pressure regulating spring rebounds to close the needle valve matching part, so that the oil injector stops injecting oil; meanwhile, the first annular groove of the rack is opposite to the third oil duct, and residual high-pressure fuel oil in the oil injector flows to the low-pressure cavity through the third oil duct, the first annular groove and the fourth oil duct.
Preferably, a leakage oil passage communicated with an external space is arranged in the oil injector body, and a middle hole communicated with the leakage oil passage is arranged on the thrust block, so that leakage fuel oil in the first cavity flows out through the middle hole and the leakage oil passage.
Preferably, the electronic control fuel injector further comprises:
the nozzle is tightly covered, through threaded connection between the nozzle is tightly covered and the injector body, in order to incite somebody to action injector body, needle valve stroke limit dish, needle valve idol piece and nozzle are tightly covered and link together.
Preferably, a position where the third oil passage communicates with the third cavity is lower than a position where the fourth oil passage communicates with the third cavity;
the preset first position is an upper stop point of the rack adjusting mechanism; the preset second position is a bottom dead center of the rack adjusting mechanism.
The invention has the beneficial effects that:
according to the electric control oil sprayer disclosed by the invention, the mode that the electromagnetic valve element controls the rack adjusting mechanism to further control oil spraying is adopted, on one hand, the structure is simple, the metering hole structure is not adopted, all parts of the oil sprayer are easy to process, the consistency of the oil spraying quantity of the oil sprayer is ensured to be easier, and the manufacturing cost can be reduced; on the other hand, the electromagnetic valve element does not need to indirectly control the opening and closing of the needle valve matching part through fuel oil, the control sensitivity is prevented from being influenced by the fact that certain time is needed for pressurizing or decompressing the fuel oil in the fuel oil chamber through a through hole, the reaction time can be shortened, and the control sensitivity of the fuel injector is improved.
Drawings
The invention is further described with reference to the following figures and embodiments.
FIG. 1 is a cross-sectional view of an electrically controlled fuel injector;
FIG. 2 is a partial schematic view of FIG. 1;
FIG. 3-1 is a cross-sectional view of the injector body;
FIG. 3-2 is a partial schematic view of FIG. 3-1;
FIG. 4 is a cross-sectional view of a stop block;
FIG. 5 is a cross-sectional view of a needle valve travel limiting disc;
FIG. 6 is a cross-sectional view of the rack;
FIG. 7 is a schematic view of a toothed bar;
description of the main reference numerals: 1-an oil injector body, 2-a needle valve stroke limiting disc, 3-a needle valve matching part, 4-a nozzle tightening cap, 5-a mandril, 6-a pressure regulating spring, 7-a thrust block, 8-a rack regulating mechanism, 81-a rack, 82-a rack rod, 9-an electromagnetic valve element, an A-leakage oil passage, B-a second oil passage, C-a third oil passage, D-a fourth oil passage, E-a fifth oil passage, a-a first cavity, B-a second cavity, C-a third cavity, D-a fourth cavity, E-a fifth cavity, f-a first ring groove, g-teeth, h-a gear, i-a second ring groove, j-a flat area and a k-a cylindrical surface.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
As shown in fig. 1 and fig. 2, the present embodiment provides an electrically controlled fuel injector, which includes a fuel injector body 1, a needle valve stroke limiting disc 2, a needle valve coupling 3, a nozzle tightening cap 4, and a carrier rod 5, a pressure regulating spring 6, a thrust block 7, a rack adjusting mechanism 8, and a solenoid valve element 9, which are installed in the fuel injector body 1 and the needle valve stroke limiting disc 2. The rack adjusting mechanism 8 comprises a rack 81 and a rack rod 82, the rack 81 is connected with the electromagnetic valve element 9 through threads, the electromagnetic valve element 9 controls the rack 81 to reciprocate, the rack rod 82 is meshed with the rack 81, and the rack 81 drives the rack rod 82 to rotate. The nozzle tightening cap 4 and the oil injector body 1 are connected together through threads, wherein the oil injector body 1, the needle valve stroke limiting disc 2, the needle valve matching part 3 and the nozzle tightening cap 4 are connected together through threads.
As shown in fig. 3-1 and 3-2, the injector body 1 is designed with a first cavity a housing the pressure regulating spring 6 and the thrust block 7; a leakage oil duct A with one end communicated with the external space and the other end communicated with the first cavity a is designed in the oil injector body 1; the injector body 1 is designed with a second cavity b for accommodating the solenoid valve element 9, a third cavity c for accommodating the rack 81 and a fourth cavity d for accommodating the rack 82; the oil injector body 1 is provided with a second oil duct B and is communicated with the fourth cavity d; the injector body 1 is designed with a third oil passage C communicating the third cavity C with the second oil passage B and a fourth oil passage D communicating the third cavity C with the low-pressure cavity, and the orifice position of the third oil passage C in the third cavity C is lower than the orifice position of the fourth oil passage D in the third cavity C, even if the rack 81 moves to the top dead center, the orifice of the third oil passage C is completely blocked by the rack 81, but the orifice of the fourth oil passage D is not blocked, and the leaked oil can be discharged to the low-pressure cavity through the fourth oil passage D at any time.
As shown in fig. 4, the thrust block 7 is designed with a center hole through which leakage oil can flow to the external space, and a leakage oil passage a.
As shown in fig. 5, the needle valve stroke limiting disc 2 is designed with a fifth cavity E and a fifth oil passage E for accommodating the carrier rod 5.
As shown in fig. 6, one end of the rack 81 is designed with a threaded mounting hole, and the side away from the threaded mounting hole is designed with a first annular groove f. The toothed rack 81 is designed with axially distributed teeth g.
As shown in fig. 7, one side of the rack 82 is designed with a gear h, one side far away from the gear h is designed with a second annular groove i, two flat areas j are designed at a position between the gear h and the second annular groove i, and two sides of the two flat areas j are designed with cylindrical surfaces k.
Referring to fig. 2, after the rack adjusting mechanism 8 is mounted on the fuel injector, one of the cylindrical surfaces k completely blocks the second oil passage B, that is, the second oil passage B is in a normally closed state; at this time, the rack 81 is located at the bottom dead center (i.e. the preset second position in this embodiment), and the third oil passage C is not blocked by the rack 81, i.e. the third oil passage C is in a normally open state.
When the high-pressure fuel injector works, the electromagnetic valve element 9 controls the rack 81 to move upwards to a top dead center (namely a preset first position), the rack 81 completely blocks the third oil duct C, but does not block the fourth oil duct D, meanwhile, the rack 81 also drives the rack 82 to rotate upwards until the second oil duct B is completely opened, the high-pressure fuel flows into the second annular groove i through a cavity formed between the plane of one flat area j and the injector body 1, then flows into a cavity on the other side formed between the plane of the other flat area j and the injector body 1, then flows into the needle valve coupling 3 through the second oil duct B, the fifth oil duct E and the sixth oil duct, and finally flows into the needle valve coupling 3, so that the needle valve coupling 3 is opened to start fuel injection.
The electromagnetic valve element 9 controls the rack 81 to move downwards to the bottom dead center, the rack 81 drives the rack 82 to rotate until one of the cylindrical surfaces k completely blocks the second oil passage B, namely, the second oil passage B is closed, the needle valve matching part 3 is also closed, and oil injection is stopped. Meanwhile, the rack 81 moves downwards to open the third oil duct C (at this time, the first ring groove f is communicated with the third oil duct C and the fourth oil duct D), and residual high-pressure fuel in the oil injector flows to the low-pressure cavity through the third oil duct C, the first ring groove f and the fourth oil duct D, so that the high-pressure fuel of the oil injector is rapidly decompressed, and the oil injector is prevented from secondary injection.
The electric control oil injector has the following technical effects:
1) and controlling the oil injection mode of the oil injector by adopting an electromagnetic valve element 9 to control the rack adjusting mechanism 8. When the oil sprayer is closed, the second oil passage B is blocked, the residual high-pressure fuel oil in the fifth oil passage E, the sixth oil passage and the needle valve matching part 3 is still sprayed outwards through an oil spraying hole at the end part of the needle valve matching part 3, so that the pressure of the high-pressure fuel oil in the oil sprayer is gradually reduced, and under the action of the pretightening force of the pressure regulating spring 6, the ejector rod 5 and the needle valve in the needle valve matching part 3 are reset, so that the needle valve matching part 3 is closed, and oil spraying is stopped; because the third oil duct C is in a conducting state, part of residual high-pressure fuel oil after oil injection is stopped can still flow out through the third oil duct C and the fourth oil duct D, the pressure relief effect is achieved, the pressure of the residual high-pressure fuel oil in the oil injector can not be gradually superposed to exceed the pre-tightening force of the pressure regulating spring 6, and secondary injection of the oil injector is avoided.
2) In the embodiment, the oil injection principle of the oil injector is improved, and when the oil injector injects oil, the opening or closing of the second oil passage B can realize the opening and closing control of the oil injection of the oil injector; the second oil duct B is opened, high-pressure fuel oil enters the oil sprayer, the needle valve matching part is instantly opened under the high pressure, and the oil sprayer starts to spray oil; the second oil passage B is closed, high-pressure fuel oil cannot enter the oil sprayer, the high-pressure fuel oil remained in the oil sprayer still continuously sprays oil outwards through the plurality of spray holes, and the high-pressure fuel oil remained in the oil sprayer also flows out through the third oil passage C and the fourth oil passage D, so that pressure can be quickly relieved, the needle valve coupling part is quickly closed, and oil spraying is stopped. The time required by the opening process or the closing process of the fuel injector is far shorter than the time required by the prior art for indirectly controlling the opening and closing of the needle valve matching part by pressurizing or decompressing the fuel in the control cavity through the metering orifice structure, so that the reaction time can be shortened.
3) The existing metering hole structure is cancelled, the manufacturing difficulty of the product can be reduced, and the manufacturing cost is reduced.
The embodiment shows that the invention adopts the mode that the electromagnetic valve element 9 controls the rack adjusting mechanism 8 so as to control oil injection, has no metering orifice structure, is easy to process, is easy to ensure the consistency of the oil injection quantity of the oil injector, can effectively improve the qualified rate of manufacture and reduce the manufacturing cost; in addition, the invention can shorten the time from the start of the movement of the armature of the electromagnetic valve element 9 to the start of the opening or the start of the closing of the needle valve matching part 3, and improve the control sensitivity of the fuel injector.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (5)
1. An electrically controlled fuel injector, comprising: the fuel injector body (1), the needle valve stroke limiting disc (2) and the needle valve coupling piece (3) are connected in sequence;
the surface of the oil injector body (1) is provided with a low-pressure cavity; a first cavity (a), a second cavity (b), a third cavity (c) and a fourth cavity (d) are arranged in the oil injector body (1); a first oil duct communicated with the fourth cavity (D) is arranged on the outer wall of the oil injector, and a second oil duct (B) communicated with the fourth cavity (D), a third oil duct (C) communicated with the second oil duct (B) and a fourth oil duct (D) communicated with the third cavity (C) are arranged in the oil injector body (1); the third oil duct (C) is communicated with the third cavity (C), and the fourth oil duct (D) is communicated with the low-pressure cavity; a fifth oil duct (E) communicated with the second oil duct (B) is arranged in the needle valve stroke limiting disc (2), and a sixth oil duct communicated with the fifth oil duct (E) is arranged in the needle valve coupling piece (3); a fifth cavity (e) is formed in the needle valve stroke limiting disc (2);
a solenoid valve element (9) mounted in said second cavity (b); a rack adjustment mechanism (8) driven by the solenoid valve element (9); the rack adjusting mechanism (8) is installed in the third cavity (c) and the fourth cavity (d);
a thrust block (7) and a pressure regulating spring (6) mounted in the first cavity (a);
a mandril (5) arranged in the fifth cavity (e); the pressure regulating spring (6) is limited between the thrust block (7) and the ejector rod (5);
the electromagnetic valve element (9) drives the rack adjusting mechanism (8) to move to a preset first position, the rack adjusting mechanism (8) is blocked, high-pressure fuel oil flows into the third oil duct (C) through the first oil duct and the space formed between the wall of the rack adjusting mechanism (8) and the wall of the fourth cavity (d) and flows into the second oil duct (B), then flows into the needle valve matching part (3) through the fifth oil duct (E), the high-pressure fuel oil flowing into the needle valve matching part (3) pushes the needle valve to move, and then the ejector rod (5) is pushed to compress the pressure regulating spring (6), so that the needle valve matching part (3) is opened, and the high-pressure fuel oil is sprayed outwards through an oil spray hole at the end part of the needle valve matching part (3);
when the electromagnetic valve element (9) drives the rack adjusting mechanism (8) to move to a preset second position, the rack adjusting mechanism (8) blocks the second oil duct (B), and the pressure regulating spring (6) rebounds to close the needle valve matching part (3) so that the oil injector stops injecting oil; meanwhile, the rack adjusting mechanism (8) conducts the third oil duct (C), and residual high-pressure fuel oil in the oil injector flows to the low-pressure cavity through the third oil duct (C) and the fourth oil duct (D), so that pressure relief of the residual high-pressure fuel oil is realized.
2. The electrically controlled fuel injector according to claim 1, characterized in that the rack adjusting mechanism (8) includes: a rack (81) and a rack bar (82);
the rack (81) is arranged in the third cavity (c), one end of the rack (81) is provided with a threaded mounting hole, the rack (81) is fixedly connected with the electromagnetic valve element (9) through the threaded mounting hole, the outer circumference of one end of the rack (81) far away from the threaded mounting hole is provided with a first annular groove (f), and the outer surface of the rack (81) is provided with teeth (g) along the axial direction thereof;
the toothed bar (82) is arranged in the fourth cavity (d), a gear (h) meshed with the teeth (g) is arranged on the outer circumference of the toothed bar (82), a second annular groove (i) is arranged on the outer circumference of one end, far away from the gear (h), of the toothed bar (82), two opposite flat areas (j) are formed in the area, located between the gear (h) and the second annular groove (i), of the toothed bar (82), and the two flat areas (j) are communicated through two cylindrical surfaces (k);
wherein when the electromagnetic valve element (9) drives the rack adjusting mechanism (8) to move to a preset first position, the rack (81) blocks the third oil passage (C), a gap is formed between one of the flat areas (j) of the rack (82) and the second oil passage (B), a gap is formed between the other flat area (j) of the rack bar (82) and the first oil channel, high-pressure fuel sequentially passes through the first oil channel, the gap formed between the other flat area (j) of the rack bar (82) and the first oil channel, the second annular groove (i), and the gap formed between one of the flat areas (j) of the rack bar (82) and the second oil channel (B) and flows into the second oil channel (B), then flows into the needle valve coupling part (3) through the fifth oil passage (E);
when the electromagnetic valve element (9) drives the rack adjusting mechanism (8) to move to a preset second position, one cylindrical surface (k) of the rack rod (82) blocks the second oil passage (B), and the pressure regulating spring (6) rebounds to close the needle valve matching part (3) so that the oil injector stops injecting oil; meanwhile, the first annular groove (f) of the rack (81) is opposite to the third oil duct (C), and residual high-pressure fuel oil in the oil sprayer flows to the low-pressure cavity through the third oil duct (C), the first annular groove (f) and the fourth oil duct (D).
3. The electric fuel injector according to claim 1, characterized in that a leakage oil passage (a) communicating with an external space is provided in the injector body (1), and a central hole communicating with the leakage oil passage (a) is provided in the thrust block (7) so that leakage fuel in the first cavity (a) flows out through the central hole and the leakage oil passage (a).
4. The electrically controlled fuel injector according to claim 1, characterized by further comprising:
the nozzle is tightly covered with a cap (4), through threaded connection between the nozzle is tightly covered with a cap (4) and the injector body (1), in order to connect the injector body (1), the needle valve stroke limiting disc (2), the needle valve coupling (3) and the nozzle is tightly covered with a cap (4) together.
5. The electric fuel injector according to claim 1, characterized in that the third oil passage (C) communicates with the third cavity (C) at a position lower than the fourth oil passage (D) communicates with the third cavity (C);
the preset first position is a top dead center of the rack adjusting mechanism (8); the preset second position is a bottom dead center of the rack adjusting mechanism (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111410911.8A CN114017221B (en) | 2021-11-25 | 2021-11-25 | Electric control fuel injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111410911.8A CN114017221B (en) | 2021-11-25 | 2021-11-25 | Electric control fuel injector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114017221A true CN114017221A (en) | 2022-02-08 |
| CN114017221B CN114017221B (en) | 2024-02-06 |
Family
ID=80066487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111410911.8A Active CN114017221B (en) | 2021-11-25 | 2021-11-25 | Electric control fuel injector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114017221B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101782036A (en) * | 2009-12-09 | 2010-07-21 | 苏州麦格特发动机有限公司 | Electrically-controlled pump nozzle for injecting fuel of diesel motor |
| CN101900062A (en) * | 2010-07-21 | 2010-12-01 | 山东鑫亚工业股份有限公司 | Electro-control high pressure injection pump for single cylinder diesel |
| WO2017028537A1 (en) * | 2015-08-14 | 2017-02-23 | 江苏科技大学 | Fuel injector for marine diesel engine |
-
2021
- 2021-11-25 CN CN202111410911.8A patent/CN114017221B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101782036A (en) * | 2009-12-09 | 2010-07-21 | 苏州麦格特发动机有限公司 | Electrically-controlled pump nozzle for injecting fuel of diesel motor |
| CN101900062A (en) * | 2010-07-21 | 2010-12-01 | 山东鑫亚工业股份有限公司 | Electro-control high pressure injection pump for single cylinder diesel |
| WO2017028537A1 (en) * | 2015-08-14 | 2017-02-23 | 江苏科技大学 | Fuel injector for marine diesel engine |
Non-Patent Citations (1)
| Title |
|---|
| 徐俊鼎: "柴油机电控喷射的发展", 云南工业大学学报, no. 04 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114017221B (en) | 2024-02-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7717089B2 (en) | High pressure pump having solenoid actuator | |
| US5094215A (en) | Solenoid controlled variable pressure injector | |
| CN109578186B (en) | Low oil return high-pressure common rail oil injector | |
| US6918377B2 (en) | Inward-opening variable fuel injection nozzle | |
| US8127746B2 (en) | Pressure-controlling electromagnetic valve for distinct electromagnetic and hydraulic units | |
| US5443209A (en) | High pressure diesel fuel injector for internal combustion engines | |
| CN101535625B (en) | Injector for injecting fuel | |
| CN101874156B (en) | Ball-valve operated fuel injector | |
| US4471909A (en) | Miniaturized unit fuel injector | |
| CN101910606B (en) | Fuel injector | |
| US4394962A (en) | Solenoid operated fuel injector and control valve | |
| EP1434941A1 (en) | Fuel injection valve | |
| US6840226B2 (en) | Fuel injection valve | |
| EP0913574B1 (en) | Fuel injector solenoid utilizing an apertured armature | |
| US20030029421A1 (en) | Method of reducing noise in a mechanically actuated fuel injection system and engine using same | |
| US20100037965A1 (en) | Check valve with separate spherical spring guide | |
| US6921033B2 (en) | Fuel injection valve | |
| CN105579698A (en) | Fuel injector | |
| US5934559A (en) | Electronic fuel injector with internal single-pole solenoid and center flow post | |
| CN114017221A (en) | Electric control oil injector | |
| CZ20023425A3 (en) | Fuel injection valve | |
| CN1323238C (en) | Fuel injector | |
| CN102362060B (en) | Injection valve | |
| KR20190020812A (en) | Valve assembly for injection valve, injection valve and injection method | |
| KR101979087B1 (en) | Valve assembly for an injection valve and injection valve |
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 |