CN107100771B - Micro-injection common rail oil sprayer - Google Patents
Micro-injection common rail oil sprayer Download PDFInfo
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- CN107100771B CN107100771B CN201710339139.2A CN201710339139A CN107100771B CN 107100771 B CN107100771 B CN 107100771B CN 201710339139 A CN201710339139 A CN 201710339139A CN 107100771 B CN107100771 B CN 107100771B
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- control valve
- valve core
- electromagnetic valve
- control
- armature
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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
- 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
- F02M51/0614—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of electromagnets or fixed armature
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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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 discloses a micro-injection common rail oil injector which comprises an oil injector main body, a metering orifice plate, a control piston coupling part, a needle valve assembly and an electromagnetic valve assembly, wherein the oil injector main body consists of an oil injector upper body and an oil injector lower body, the metering orifice plate is positioned between the oil injector upper body and the oil injector lower body, the oil injector lower body and the metering orifice plate are tightly pressed on the oil injector upper body through a first tight cap, the electromagnetic valve assembly is horizontally pressed in a control valve cavity of the oil injector upper body through a second tight cap, the control piston coupling part is arranged in a middle hole at the lower part of the oil injector lower body, and the needle valve assembly is tightly pressed at the lower end of the oil injector lower body through a third tight cap. The invention can improve the response speed of the common rail fuel injector and is convenient for processing, manufacturing, assembling and debugging.
Description
Technical Field
The invention belongs to the technical field of fuel injection devices of internal combustion engines, and particularly relates to a micro-injection common rail fuel injector.
Background
With increasingly stringent emission regulations and increasing energy crisis, the demands placed on fuel systems by internal combustion engines are increasing.
The micro-injection electric control fuel injector is used as a key component of the dual-fuel engine, has the characteristics of small requirement on the circulating fuel injection quantity, high stability of the small fuel quantity, narrow installation space and the like, and has high requirement on the precision of parts of the micro-injection fuel injector caused by the small requirement on the circulating fuel injection quantity and the high stability of the small fuel quantity, and correspondingly higher production cost; on the other hand, the small installation space leads to the fact that the overall dimension of the micro-injection electronic control fuel injector is greatly limited, and meanwhile, arrangement among parts of the system is required to be more compact. In addition, for marine engines, the thickness of the cylinder head is large, and the axial height dimension of the micro-injection fuel injector is required to be larger, so that the micro-injection fuel injector has the characteristic of slender shape. In view of the above, developing a micro-injection electronically controlled fuel injector with a relatively simple structure, small radial dimension, good manufacturability and capability of improving response speed is certainly of great significance to improving economy and emission of a diesel engine.
Disclosure of Invention
In order to solve the problems in the prior art, a high-pressure common rail electric control fuel injector which has a simple structure, is convenient to process, manufacture, assemble and debug and can also improve the response speed of the electric control fuel injector is developed. The fuel injector can effectively reduce the processing cost of the high-pressure common rail electric control fuel injector, improve the response speed of the fuel injector, be beneficial to the multiple injection of the common rail fuel injector, reduce the fuel consumption of a diesel engine and improve the emission of the diesel engine.
The technical scheme adopted by the invention is as follows:
the utility model provides a little spouts common rail sprayer, includes sprayer main part, measuring orifice plate, control piston coupling, needle valve subassembly and solenoid valve subassembly, the sprayer main part comprises sprayer upper body and sprayer lower part of the body, the measuring orifice plate is located the sprayer upper and lower body between, and sprayer lower part of the body and measuring orifice plate compress tightly on the sprayer upper body through first tight cap, solenoid valve subassembly compresses tightly in the control valve pocket of sprayer upper body through the level of second tight cap, control piston coupling installs in the lower part mesopore of sprayer lower part of the body, needle valve subassembly compresses tightly the lower extreme of the body under the sprayer through the third tight cap.
Further, the electromagnetic valve assembly comprises an electromagnetic valve, a control valve core, a clamping ring, an armature, a sleeve, an electromagnetic valve spring, a supporting spring and a supporting disc, wherein the position, close to the inner end, of the control valve core is sealed with the conical surface of the control valve cavity, the outer end of the control valve core is close to the electromagnetic valve, the distance between the electromagnetic valve and the outer end of the control valve core is used as the lift of the control valve core, the armature, the supporting spring, the supporting disc and the electromagnetic valve spring are sequentially sleeved on the control valve core along the direction from the outer end to the inner end of the control valve core, the outer end of the armature is axially positioned with the control valve core through the clamping ring, the inner end of the armature is pressed against the supporting disc through the supporting spring, the outer end face of the control valve core protrudes out of the outer end face of the armature, and the axial distance between the outer end face of the control valve core and the outer end face of the armature is used as the minimum air gap of the armature; the sleeve is arranged between the electromagnetic valve and the supporting disc, and two ends of the sleeve respectively lean against the electromagnetic valve and the supporting disc so as to adjust the maximum air gap of the armature; the electromagnetic valve spring is pressed between the support disc and the shoulder blade at the inner end of the control valve core.
Further, the inner end of the control valve core is provided with a balance piston along the axial direction of the control valve core, and the balance piston is in sliding fit with the inner wall of the control valve cavity so as to guide the movement direction of the control valve core and balance the hydraulic pressure born by the conical sealing surface of the control valve core.
Further, the needle valve assembly comprises a pressure regulating spring, a pressure regulating spring seat, a needle valve and a needle valve body, a transition block is arranged between the needle valve body and the lower body of the fuel injector, and the pressure regulating spring seat are both positioned in a middle hole of the transition block; the control piston coupling comprises a piston sleeve and a control piston, the piston sleeve presses the pressure regulating spring on the lower end head of the pressure regulating spring seat, the upper end of the pressure regulating spring seat is contacted with the lower end of the control piston, and the lower end of the pressure regulating spring seat is propped against the upper end of the needle valve.
Further, an adjusting gasket is arranged between the electromagnetic valve spring and the supporting disc, and a pressure regulating gasket is arranged between the pressure regulating spring and the pressure regulating spring seat.
The invention has the beneficial effects that:
1. the electromagnetic valve assembly is moved upwards and horizontally arranged at the upper part of the fuel injector, so that the radial size of the lower part of the fuel injector is reduced, and the fuel injector has the characteristic of slender shape and meets the requirement of narrow installation space of a fuel injection system of the dual-fuel engine.
The supporting disc in the electromagnetic valve assembly is used as a supporting spring and a common spring seat of the electromagnetic valve spring, the electromagnetic valve spring is arranged between the shoulder blade of the control valve core and the supporting disc, a spring mounting hole can be prevented from being formed in the electromagnetic valve, the design difficulty of the electromagnetic valve is reduced, the main magnetic pole area and the auxiliary magnetic pole area of the electromagnetic valve can be flexibly designed to meet the requirement of electromagnetic force, and the response characteristic and the injection performance of the fuel injector are improved.
The transition block is arranged between the needle valve body and the lower body of the fuel injector, so that the structure of parts such as the needle valve body is simplified, and the difficulty in machining and assembling the parts is reduced.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is an enlarged view of the upper portion of fig. 1.
Fig. 3 is an enlarged view of the middle position of fig. 1.
Fig. 4 is an enlarged view of the lower position of fig. 1.
In the figure: 1-injector upper body, 2-orifice plate, 3-injector lower body, 4-control piston, 5-pilot spring, 6-needle valve body, 7-needle valve, 8-third cap, 9-pilot spring seat, 10-transition block, 11-piston sleeve, 12-first cap, 13-armature, 14-pilot valve, 15-solenoid valve, 16-second cap, 17-support disc, 18-sleeve, 19-collar, 20-support spring, 21-pilot washer, 22-solenoid valve spring, 23-pilot washer; 1 a-a high-pressure oil duct, 1 b-a control oil duct, 1 c-an oil return duct, 1 d-a high-pressure oil inlet port and 1 f-an oil return port; 2 a-an oil inlet orifice and 2 b-an oil outlet orifice; 6 a-oil sump.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to the micro-injection common rail fuel injector shown in fig. 1, the micro-injection common rail fuel injector comprises a fuel injector main body, a measuring orifice plate 2, a control piston 4 coupling part, a needle valve assembly and a solenoid valve assembly.
As shown in fig. 1 and 3, the injector body is composed of an injector upper body 1 and an injector lower body 3, the metering orifice 2 is located between the injector upper body 1 and the injector lower body 3, and the injector lower body 3 and the metering orifice 2 are pressed on the injector upper body 1 through a first tightening cap 12.
As shown in fig. 2, the electromagnetic valve assembly is horizontally pressed in the control valve cavity of the upper body 1 of the fuel injector through the second tightening cap 16, and comprises an electromagnetic valve 15, a control valve core 14, a clamping ring 19, an armature 13, a sleeve 18, an electromagnetic valve spring 22, a support spring 20 and a support disc 17, wherein the position, close to the inner end, of the control valve core 14 is sealed with the conical surface of the control valve cavity, the outer end of the control valve core 14 is close to the electromagnetic valve 15, the distance between the electromagnetic valve 15 and the outer end of the control valve core 14 is used as the lift of the control valve core 14, the armature 13, the support spring 20, the support disc 17 and the electromagnetic valve spring 22 are sequentially sleeved on the control valve core 14 along the direction from the outer end to the inner end of the control valve core 14, the outer end of the armature 13 is axially positioned with the control valve core 14 through the clamping ring 19, the inner end of the armature 13 is pressed against the support disc 17 through the support spring 20, the outer end of the control valve core 14 protrudes out of the outer end of the armature 13, and the axial distance between the outer end of the control valve core 14 and the outer end of the armature 13 is used as the minimum air gap of the armature 13; the sleeve 18 is arranged between the electromagnetic valve 15 and the supporting disc 17, two ends of the sleeve 18 respectively lean against the electromagnetic valve 15 and the supporting disc 17, and the maximum air gap of the armature 13 is adjusted by changing the length of the sleeve 18; the solenoid valve spring 22 is pressed between the support disc 17 and the shoulder blade at the inner end of the control valve core 14.
The structure not only improves the response speed of the fuel injector and is beneficial to the repeated injection of the common rail fuel injector, but also reduces the design difficulty of the electromagnetic valve 15.
In this embodiment, in order to guide the movement direction of the control valve element 14, a balance piston is disposed at the inner end of the control valve element 14 along the axial direction thereof, and is slidably engaged with the inner wall of the control valve cavity, and the balance piston can balance the hydraulic force borne by the tapered sealing surface of the control valve element 14.
As shown in fig. 4, the needle valve assembly includes a pressure regulating spring 5, a pressure regulating spring seat 9, a needle valve 7 and a needle valve body 6, a transition block 10 is arranged between the lower body 3 of the fuel injector and the needle valve body 6 for easy installation and adjustment, the pressure regulating spring 5 and the pressure regulating spring seat 9 are both positioned in a middle hole of the transition block 10, and a channel for communicating a high-pressure oil duct 1a on the lower body 3 of the fuel injector with a high-pressure oil duct 1a on the needle valve body 6 is arranged on the transition block 10; the control piston matching part comprises a piston sleeve 11 and a control piston 4, the piston sleeve 11 is installed in a middle hole in the lower portion of the lower body 3 of the oil sprayer in an interference mode, the control piston 4 is located in the piston sleeve 11 and is in sliding fit with the piston sleeve 11, the piston sleeve 11 presses the pressure regulating spring 5 on the lower end head of the pressure regulating spring seat 9, the upper end of the pressure regulating spring seat 9 is in contact with the lower end of the control piston 4, and the lower end of the pressure regulating spring seat 9 is propped against the upper end of the needle valve 7.
In this embodiment, a pressure regulating spacer 23 is installed between the pressure regulating spring 5 and the pressure regulating spring seat 9, and the pretightening force of the pressure regulating spring 5 can be flexibly adjusted by changing the thickness of the pressure regulating spacer 23. Similarly, an adjusting gasket 21 is installed between the electromagnetic valve spring 22 and the supporting disc 17, and the pretightening force of the electromagnetic valve spring 22 can be adjusted by changing the thickness of the adjusting gasket 21, and the accumulated errors of the processing and the assembly of parts can be compensated.
The working principle of the invention is as follows: the high-pressure fuel enters the upper body 1 of the fuel injector from the high-pressure fuel inlet interface 1d, and then is divided into two paths: one path enters a control cavity on the lower body 3 of the fuel injector through the fuel inlet orifice 2a on the orifice plate 2, and the other path enters the oil containing groove 6a of the needle valve body 6 through the lower body 3 of the fuel injector, the transition block 10 and the high-pressure oil duct 1a on the needle valve body 6 in sequence and fills the inner cavity of the needle valve body 6. The electromagnetic valve 15 is connected with an electronic control system (ECU for short), the ECU controls the operation of the electromagnetic valve 15 according to the operation condition of the diesel engine, the electromagnetic valve 15 is powered off before the ECU sends out an oil injection command, the control valve core 14 is sealed with the conical surface of the control valve cavity in the upper body 1 of the oil injector, the control piston 4 is pressed down by the hydraulic pressure in the control cavity to compress the needle valve 7, and the needle valve 7 is in a closed state.
When the ECU sends out an oil injection command, the electromagnetic valve 15 is electrified, the armature 13 is quickly closed to the electromagnetic valve 15 against the spring force under the action of electromagnetic force, the control valve core 14 is opened under the action of electromagnetic force, high-pressure fuel in the control cavity is sequentially discharged from the oil return interface 1f through the oil outlet orifice 2b on the orifice plate 2, the control valve cavity and the oil return oil passage 1c on the upper body 1 of the oil injector, the pressure in the control cavity is reduced, when the pressure in the control cavity is reduced to a certain value, the control piston 4 and the needle valve 7 are controlled to ascend, the lower end of the needle valve body 6 starts oil injection, the electrifying duration of the electromagnetic valve 15 is accurately controlled according to the working condition requirement of the engine, so that the circulating oil injection quantity is accurately controlled, and the normal operation of the engine is ensured.
In this embodiment, the fuel flowing into the middle hole of the transition block 10 from the gap between the control piston 4 and the piston sleeve 11 and the gap between the needle valve 7 and the needle valve body 6 is discharged from the oil return port 1f through the oil return passage 1c of the lower injector body 3, the orifice plate 2 and the upper injector body 1 in sequence.
Claims (2)
1. The utility model provides a little spouts common rail sprayer, includes sprayer main part, measuring orifice board (2), control piston coupling part, needle valve subassembly and solenoid valve subassembly, its characterized in that: the oil sprayer main body consists of an oil sprayer upper body (1) and an oil sprayer lower body (3), the orifice measuring plate is positioned between the upper body and the lower body of the oil sprayer, the orifice measuring plate (2) is provided with an oil inlet orifice (2 a) and an oil outlet orifice (2 b), the oil sprayer lower body and the orifice measuring plate are tightly pressed on the oil sprayer upper body through a first tight cap (12), the electromagnetic valve assembly is horizontally pressed in a control valve cavity of the oil sprayer upper body through a second tight cap (16), the control piston matching part is arranged in a middle hole at the lower part of the oil sprayer lower body, and the needle valve assembly is tightly pressed at the lower end of the oil sprayer lower body through a third tight cap (8);
the electromagnetic valve assembly comprises an electromagnetic valve (15), a control valve core (14), a clamping ring (19), an armature (13), a sleeve (18), an electromagnetic valve spring (22), a supporting spring (20) and a supporting disc (17), wherein the position, close to the inner end, of the control valve core is sealed with the conical surface of the control valve cavity, the outer end of the control valve core is close to the electromagnetic valve, the distance between the electromagnetic valve and the outer end of the control valve core is used as the lift of the control valve core, the armature, the supporting spring, the supporting disc and the electromagnetic valve spring are sequentially sleeved on the control valve core along the direction from the outer end to the inner end of the control valve core, the outer end of the armature is axially positioned with the control valve core through the clamping ring, the inner end of the armature is propped against the supporting disc through the supporting spring, the outer end face of the control valve core protrudes out of the outer end face of the armature, and the axial distance between the outer end face of the control valve core and the outer end face of the armature is used as the minimum air gap of the armature; the sleeve is arranged between the electromagnetic valve and the supporting disc, and two ends of the sleeve respectively lean against the electromagnetic valve and the supporting disc so as to adjust the maximum air gap of the armature; the electromagnetic valve spring is pressed between the supporting disc and the shoulder blade at the inner end of the control valve core; the inner end of the control valve core (14) is provided with a balance piston along the axial direction of the control valve core, and the balance piston is in sliding fit with the inner wall of the control valve cavity so as to guide the movement direction of the control valve core and balance the hydraulic pressure born by the conical sealing surface of the control valve core;
the needle valve assembly comprises a pressure regulating spring (5), a pressure regulating spring seat (9), a needle valve (7) and a needle valve body (6), a transition block (10) is arranged between the needle valve body and the lower body of the fuel injector, and the pressure regulating spring seat are both positioned in a middle hole of the transition block; the control piston matching part comprises a piston sleeve (11) and a control piston (4), the piston sleeve presses the pressure regulating spring on the lower end head of the pressure regulating spring seat, the upper end of the pressure regulating spring seat is contacted with the lower end of the control piston, and the lower end of the pressure regulating spring seat is propped against the upper end of the needle valve.
2. The micro-injection common rail injector of claim 1, wherein: an adjusting gasket (21) is arranged between the electromagnetic valve spring (22) and the supporting disc (17), and a pressure adjusting gasket (23) is arranged between the pressure adjusting spring (5) and the pressure adjusting spring seat (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710339139.2A CN107100771B (en) | 2017-05-15 | 2017-05-15 | Micro-injection common rail oil sprayer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710339139.2A CN107100771B (en) | 2017-05-15 | 2017-05-15 | Micro-injection common rail oil sprayer |
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| Publication Number | Publication Date |
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| CN107100771A CN107100771A (en) | 2017-08-29 |
| CN107100771B true CN107100771B (en) | 2023-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710339139.2A Active CN107100771B (en) | 2017-05-15 | 2017-05-15 | Micro-injection common rail oil sprayer |
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| CN (1) | CN107100771B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107524551B (en) * | 2017-08-31 | 2020-01-31 | 重庆红江机械有限责任公司 | micro-injection electric control oil injector with pressure maintaining structure |
| CN107514328B (en) * | 2017-09-27 | 2023-12-08 | 重庆红江机械有限责任公司 | Micro-injection electric control fuel injector for dual-fuel engine |
| CN109162848B (en) * | 2018-10-30 | 2020-06-19 | 中船动力研究院有限公司 | Electric control oil injector system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204299753U (en) * | 2014-11-27 | 2015-04-29 | 重庆红江机械有限责任公司 | A kind of high pressure common rail electric control fuel injector |
| CN105840379A (en) * | 2016-03-24 | 2016-08-10 | 中国北方发动机研究所(天津) | L-shaped common-rail fuel injector |
| CN106438545A (en) * | 2016-10-17 | 2017-02-22 | 浙江华益精密机械股份有限公司 | Load sensing type balance valve |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103423049B (en) * | 2013-09-06 | 2015-10-28 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Injector assembly |
| CN204299754U (en) * | 2014-12-03 | 2015-04-29 | 重庆红江机械有限责任公司 | A kind of electric-controlled fuel injector of radial oil-feed |
| CN106089523A (en) * | 2016-08-16 | 2016-11-09 | 重庆红江机械有限责任公司 | A kind of high pressure common rail electric control fuel injector |
| CN207004700U (en) * | 2017-05-15 | 2018-02-13 | 重庆红江机械有限责任公司 | A kind of new micro- spray common-rail injector |
-
2017
- 2017-05-15 CN CN201710339139.2A patent/CN107100771B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204299753U (en) * | 2014-11-27 | 2015-04-29 | 重庆红江机械有限责任公司 | A kind of high pressure common rail electric control fuel injector |
| CN105840379A (en) * | 2016-03-24 | 2016-08-10 | 中国北方发动机研究所(天津) | L-shaped common-rail fuel injector |
| CN106438545A (en) * | 2016-10-17 | 2017-02-22 | 浙江华益精密机械股份有限公司 | Load sensing type balance valve |
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