CN112081673A - Dual-fuel injector - Google Patents
Dual-fuel injector Download PDFInfo
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- CN112081673A CN112081673A CN202010955995.2A CN202010955995A CN112081673A CN 112081673 A CN112081673 A CN 112081673A CN 202010955995 A CN202010955995 A CN 202010955995A CN 112081673 A CN112081673 A CN 112081673A
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- 239000000446 fuel Substances 0.000 title claims abstract description 111
- 238000002347 injection Methods 0.000 claims abstract description 138
- 239000007924 injection Substances 0.000 claims abstract description 138
- 230000007246 mechanism Effects 0.000 claims abstract description 92
- 230000009977 dual effect Effects 0.000 claims description 24
- 238000007789 sealing Methods 0.000 claims description 15
- 230000006835 compression Effects 0.000 claims description 14
- 238000007906 compression Methods 0.000 claims description 14
- 238000004891 communication Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims 1
- 239000003921 oil Substances 0.000 abstract description 190
- 239000007789 gas Substances 0.000 abstract description 88
- 239000002737 fuel gas Substances 0.000 abstract description 41
- 238000002485 combustion reaction Methods 0.000 abstract description 26
- 239000000295 fuel oil Substances 0.000 abstract description 18
- 238000000034 method Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 9
- 230000002349 favourable effect Effects 0.000 abstract description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 36
- 239000003345 natural gas Substances 0.000 description 16
- 230000009286 beneficial effect Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 4
- 239000002283 diesel fuel Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000004134 energy conservation Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/0639—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
- F02D19/0642—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
- F02D19/0647—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02D19/0686—Injectors
- F02D19/0689—Injectors for in-cylinder direct injection
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/08—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
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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)
- Oil, Petroleum & Natural Gas (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 engines, and discloses a dual-fuel injector which comprises an oil injection mechanism capable of injecting fuel oil outwards through an oil injection port; the air injection mechanism comprises an air injection assembly, the air injection assembly comprises an air nozzle sleeve, an air nozzle valve core and a piezoelectric mechanism, an air injection port used for injecting fuel gas is formed in the air nozzle sleeve, a control oil cavity and a fuel gas containing cavity are formed between the air nozzle sleeve and the oil injection mechanism, the air nozzle valve core is sealed and clamped between the air nozzle sleeve and the oil injection mechanism in a sliding mode, the control oil cavity and the fuel gas containing cavity are located on two sides of the air nozzle valve core respectively, the air nozzle valve core can seal and separate the fuel gas containing cavity from the air injection port, control oil communicated in the control oil cavity, fuel gas communicated in the piezoelectric mechanism and the fuel gas containing cavity acts on the air nozzle valve core together, and the air nozzle valve. The dual-fuel injector can shorten the opening delay and the closing delay of the gas injection process, is favorable for accurately controlling the gas injection, and can improve the combustion performance of an engine.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a dual-fuel injector.
Background
Common medium and heavy vehicle engines, engineering machinery and marine engines mostly adopt diesel oil as fuel, and a small part of the diesel oil adopts natural gas as fuel. The engine using natural gas as fuel is generally injected by an air inlet channel and ignited by a spark plug, so that the combustion efficiency is low, and the methane emission is high.
At present, a technical scheme that a small amount of diesel oil is firstly injected into a cylinder to serve as a pilot fuel, and then a large amount of natural gas is injected to be ignited to do work appears. However, the dual-fuel injector used in the scheme has a longer distance between the valve for controlling the natural gas injection and the gas valve, so that the volume of a cavity controlled by the gas valve is too large, the pressure change speed is slower, and the injection response speed of the natural gas (the closing and opening speed of the valve for injecting the natural gas) is influenced; in addition, the existing valve for controlling the natural gas injection is difficult to control the natural gas injection precision due to the delayed opening and closing, and is not beneficial to improving the combustion performance of the engine and saving energy and reducing emission.
Disclosure of Invention
The invention aims to provide a dual-fuel injector which can shorten the opening delay and the closing delay of a gas injection process, is beneficial to accurately controlling gas injection and can improve the combustion performance of an engine.
In order to achieve the purpose, the invention adopts the following technical scheme:
a dual fuel injector comprising: the fuel injection mechanism is provided with a fuel injection port at one end and can inject fuel outwards through the fuel injection port; the gas injection mechanism comprises a gas injection assembly, the gas injection assembly comprises a gas nozzle sleeve, a gas injection port is formed in the gas nozzle sleeve and used for injecting gas outwards, a gas nozzle sleeve spacer bush is arranged at one end, provided with the oil injection port, of the oil injection mechanism, and a control oil cavity and a gas containing cavity are formed between the gas nozzle sleeve and the oil injection mechanism; the gas nozzle valve core is clamped between the gas nozzle sleeve and the oil injection mechanism in a sealing and sliding manner, the control oil cavity is positioned on one side of the gas nozzle valve core, which is far away from the oil injection port, the gas containing cavity is positioned on one side of the gas nozzle valve core, which is close to the oil injection port, and the gas containing cavity and the gas injection port can be separated in a sealing manner by the gas nozzle valve core; piezoelectric mechanism, piezoelectric mechanism's both ends support respectively hold in air cock case with the air cock sheathes in, piezoelectric mechanism can take place to warp under the applied voltage effect, control oil that leads to in the control oil pocket piezoelectric mechanism with the gas that leads to in the gas appearance chamber acts on jointly the air cock case makes air cock case can reciprocating motion in order to realize the gas holds the chamber with the break-make of air jet.
As a preferred scheme of the dual-fuel injector, an air injection cavity is arranged between the air nozzle sleeve and the air nozzle valve core, the piezoelectric mechanism is arranged in the air injection cavity, the air injection cavity is communicated with the air injection port, and the air nozzle valve core can be hermetically separated between the fuel gas cavity and the air injection cavity.
As a preferable scheme of the dual-fuel injector, the gas injection mechanism further comprises a control oil assembly, the control oil assembly comprises a compression spring, the compression spring is located in the control oil cavity, and two ends of the compression spring respectively abut against the oil injection mechanism and the air tap valve core.
As a preferable scheme of the dual-fuel injector, the control oil assembly further includes a control oil valve assembly and a control oil inlet, the control oil inlet is communicated with the control oil chamber, the control oil valve assembly is communicated with the control oil chamber, and the control oil valve assembly is used for adjusting the pressure of the control oil in the control oil chamber.
As a preferred scheme of dual fuel injector, be equipped with first annular and the second annular of intercommunication each other on the air cock case, first annular with control oil import intercommunication, first annular be located oil injection mechanism with between the air cock case, the second annular be located the air cock cover with between the air cock case.
As a preferable scheme of the dual-fuel injector, the control oil assembly further comprises an oil inlet throttle orifice plate, the oil inlet throttle orifice plate is communicated with the control oil inlet, and the control oil inlet is communicated with the control oil cavity through the oil inlet throttle orifice plate.
As a preferable scheme of the dual-fuel injector, the control oil valve assembly comprises a return oil throttle orifice, and the control oil chamber is communicated with a return oil tank through the return oil throttle orifice.
As a preferable scheme of the dual-fuel injector, the piezoelectric mechanism includes a plurality of piezoelectric columns, the plurality of piezoelectric columns are all clamped between the air tap valve core and the air tap sleeve, and the plurality of piezoelectric columns are arranged in the air injection cavity at intervals.
As a preferred scheme of the dual-fuel injector, an oil guide groove is formed in the surface, close to the air tap valve core, of the piezoelectric column, and the oil guide groove is used for preventing the piezoelectric column from being adhered to the air tap valve core.
As a preferable scheme of the dual-fuel injector, the surface of the piezoelectric column is provided with a heat insulation layer.
The invention has the beneficial effects that:
the invention provides a dual-fuel injector which can inject fuel into a cylinder of an engine only to enable the engine to carry out a pure fuel combustion mode, can inject the fuel and the fuel into the cylinder of the engine to enable the engine to carry out a dual-fuel combustion mode in which the fuel ignites the fuel, and is beneficial to enabling the engine to have good combustion characteristics and economy. The dual-fuel injector comprises an oil injection mechanism and an air injection mechanism, wherein the oil injection mechanism injects fuel oil outwards through an oil injection port arranged at one end, and the air injection mechanism injects fuel gas outwards through the air injection port located at the same end with the oil injection port, so that the dual-fuel injector can inject a small amount of fuel oil into a cylinder as ignition fuel firstly, and then injects a large amount of fuel gas to be ignited to do work, thereby not only improving the combustion efficiency, but also being beneficial to energy conservation and emission reduction.
The air faucet sleeve spacer bush with the air jet is arranged on the oil injection mechanism, a control oil cavity and a fuel gas containing cavity are formed between the air faucet sleeve and the oil injection mechanism, the air faucet valve element is sealed and slidably clamped between the air faucet sleeve and the oil injection mechanism and located between the control oil cavity and the fuel gas containing cavity, two ends of the piezoelectric mechanism are respectively abutted against the air faucet valve element and the air faucet sleeve, the air faucet valve element can reciprocate under the combined action of control oil communicated in the control oil cavity, fuel gas communicated in the piezoelectric mechanism and the fuel gas containing cavity to realize the connection and disconnection of the fuel gas containing cavity and the air jet, and accordingly fuel gas is jetted outwards. In the structure, the piezoelectric mechanism can deform under the action of an applied voltage, and after the piezoelectric mechanism is electrified, the resultant force of the control oil in the control oil cavity, the piezoelectric mechanism and the fuel gas in the fuel gas containing cavity acting on the fuel gas valve core instantly pushes the fuel gas containing cavity away from the gas nozzle to communicate the fuel gas containing cavity with the gas nozzle; the piezoelectric mechanism can also make the control oil in the control oil cavity, the piezoelectric mechanism and the gas in the gas cavity act on the gas nozzle valve core after power failure, resultant force instantly pushes the gas nozzle valve core to be close to the gas jet, the gas cavity and the gas jet are cut off, and the dual-fuel injector stops injecting the gas, so that the closing time of the gas jet is obviously shortened, the gas injection is accurately controlled, and the combustion performance of the engine can be further improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a cross-sectional view of a dual fuel injector provided by the present invention;
FIG. 2 is an enlarged view at A in FIG. 1;
FIG. 3 is a schematic diagram of the piezoelectric mechanism arrangement in the dual fuel injector provided by the present invention;
FIG. 4 is a schematic diagram of the structure of the piezoelectric column in the dual fuel injector provided by the present invention;
FIG. 5 is a schematic cross-sectional control oil seal for a dual fuel injector provided by the present invention;
FIG. 6 is an enlarged view at B in FIG. 5;
FIG. 7 is a schematic illustration of a controlled fueling cross-section of the dual fuel injector provided by the present invention.
In the figure:
1. an oil injection port; 11. an injector upper body; 111. oil injection electromagnet; 112. an oil injection control valve assembly; 12. an injector lower body; 121. a high pressure fuel inlet; 13. tightening the cap; 14. a needle valve body; 141. a high pressure oil chamber; 15. a long needle valve; 21. an air nozzle sleeve; 211. an air jet; 212. a control oil chamber; 213. a gas containing cavity; 214. an air injection cavity; 215. a gas channel; 216. a gas inlet; 22. an air tap valve core; 221. a first ring groove; 222. a second ring groove; 23. a piezoelectric mechanism; 231. a piezoelectric column; 232. an oil guide groove; 24. tightening a nozzle cap; 31. a compression spring; 32. a control valve assembly; 321. an oil return orifice plate; 322. controlling an oil return passage; 33. controlling an oil inlet; 34. an oil inlet throttling orifice plate; 35. a second control oil inlet duct; 36. the first control oil inlet duct.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The technical solution of the dual fuel injector provided by the present invention is further explained by the specific embodiment in the following with the attached drawings.
The invention provides a dual-fuel injector which can inject fuel into a cylinder of an engine only to enable the engine to carry out a pure fuel combustion mode, can inject the fuel and fuel into the cylinder of the engine to enable the engine to carry out a dual-fuel combustion mode in which the fuel ignites the fuel, and is beneficial to enabling the engine to have good combustion characteristics and economy. It will be appreciated that the fuel injected by the dual fuel injector may be either diesel fuel or other types of fuel; the fuel gas injected by the dual fuel injector can be natural gas or other types of fuel gas.
In the embodiment, the dual-fuel injector comprises an oil injection mechanism and an air injection mechanism, the oil injection mechanism is used for injecting fuel oil outwards, and the air injection mechanism is used for injecting fuel gas outwards, so that the dual-fuel injector can inject a small amount of fuel oil into a cylinder as ignition fuel firstly, and then inject a large amount of fuel gas to be ignited to do work, thereby not only improving the combustion efficiency, but also being beneficial to energy conservation and emission reduction.
In this embodiment, the dual fuel injector is mounted in the cylinder head to inject fuel directly into the combustion chamber near top dead center of engine compression. The dual-fuel injector has the same working mode as that of a traditional diesel injector in a pure fuel oil working mode; the working mode of fuel oil and pilot gas is different from that of an engine with a natural gas injected in an air inlet passage, trace fuel oil is injected before the compression top dead center of the engine to serve as pilot fuel, and then high-pressure natural gas is injected into a combustion chamber to serve as main fuel to burn and do work. Compared with air inlet channel injection, the direct injection natural gas in the cylinder adopts a diffusion combustion mode, so that the detonation phenomenon easily generated by a premixed natural gas engine is eliminated, the high combustion ratio is realized, and the dynamic property of the engine is improved. In addition, the premixed natural gas injected by the air inlet channel inevitably enters a top clearance of the combustion chamber and a piston side clearance, the natural gas is difficult to combust in the combustion process and is discharged together with the waste gas, and the problem is effectively solved by direct injection of the natural gas in the cylinder, so that the methane emission can be greatly reduced, and the energy conservation and emission reduction of the engine are facilitated.
Preferably, as shown in fig. 1 and 2, the fuel injection mechanism of the dual fuel injector includes an injector upper body 11, an injector lower body 12, and a body fastening cap 13, and the injector lower body 12 is hermetically connected to the injector upper body 11 through the body fastening cap 13 so that the injector upper body 11 and the injector lower body 12 are integrated. Specifically, the injector upper body 11 is provided therein with an injection solenoid 111 and an injection control valve assembly 112, and the injection solenoid 111 and the injection control valve assembly 112 are connected so that the operation of the injection control valve assembly 112 can be controlled by turning on and off the power of the injection solenoid 111.
In this embodiment, the fuel injection mechanism further includes a needle valve body 14, the needle valve body 14 is connected to the injector lower body 12, and one end of the needle valve body 14 away from the injector upper body 11 is opened with a fuel injection port 1, and the fuel injection port 1 is used for injecting fuel outwards.
Preferably, a high-pressure oil chamber 141 is formed in the injector lower body 12 and the needle valve body 14, a high-pressure fuel inlet 121 is formed in the injector lower body 12, the high-pressure fuel inlet 121 is communicated with the high-pressure oil chamber 141, the high-pressure oil chamber 141 is communicated with the oil injection port 1, and high-pressure fuel can enter the high-pressure oil chamber 141 through the high-pressure fuel inlet 121, then flow to the oil injection port 1 through the high-pressure oil chamber 141, and finally is injected outwards through the oil injection port 1.
Preferably, the oil injection mechanism further comprises a long needle valve 15, the long needle valve 15 is disposed in the high-pressure oil chamber 141, one end of the long needle valve 15 is connected to the oil injection control valve assembly 112, and the other end of the long needle valve 15 can be in sealing contact with the oil injection port 1, so that the long needle valve 15 can be driven by the oil injection control valve assembly 112 to open and close the oil injection port 1, and accordingly the dual-fuel injector can inject fuel outwards or stop injecting fuel.
Under the pure fuel oil working mode and the fuel oil and gas pilot working mode, fuel oil enters the high-pressure oil cavity 141 through the high-pressure fuel oil inlet 121, the fuel injection electromagnet 111 controls the opening and closing of the long needle valve 15 to the fuel injection port 1 through controlling the fuel injection control valve assembly 112, and the injection and the closing of the high-pressure fuel oil are realized, so that the fuel oil can be respectively injected into the combustion chamber as main fuel and pilot fuel.
In this embodiment, the gas injection mechanism of the dual-fuel injector comprises a gas injection assembly, the gas injection assembly comprises a nozzle sleeve 21, a gas injection port 211 is formed in the nozzle sleeve 21, and the gas injection port 211 is used for injecting fuel gas outwards. The air nozzle sleeve 21 is sleeved at one end of the needle valve body 14, which is provided with an oil injection port 1, at intervals, the air injection port 211 and the oil injection port 1 are located at the same end, a control oil cavity 212 and a gas containing cavity 213 are arranged between the air nozzle sleeve 21 and the needle valve body 14, the control oil cavity 212 is located on one side of the air nozzle valve core 22, which is far away from the oil injection port 1, the gas containing cavity 213 is located on one side of the air nozzle valve core 22, which is close to the oil injection port 1, and the gas containing cavity 213 is. Specifically, the air nozzle sleeve 21 is connected to the needle valve body 14 through threads, so that the air nozzle sleeve 21 is convenient to disassemble and assemble, and subsequent maintenance and replacement are facilitated.
Preferably, the air injection assembly further comprises a nozzle fastening cap 24, and the nozzle fastening cap 24 is used for connecting the air nozzle sleeve 21 to the needle valve body 14 in a sealing manner, so that the connection strength of the air nozzle sleeve 21 and the needle valve body 14 can be improved.
Preferably, the air injection assembly further comprises an air tap valve core 22, the air tap valve core 22 is clamped between the air tap sleeve 21 and the needle valve body 14 in a sealing and sliding manner, and the air tap valve core 22 seals and separates the gas containing cavity 213 from the control oil cavity 212, so that gas introduced into the gas containing cavity 213 and control oil introduced into the control oil cavity 212 are isolated, and oil-gas mixing is prevented from occurring, so as to avoid danger.
Further, a first annular groove 221 and a second annular groove 222 which are communicated with each other are formed in the air nozzle valve core 22, the cross section of the air nozzle valve core 22 is in an I shape, the first annular groove 221 is located between the oil injection mechanism and the air nozzle valve core 22, the second annular groove 222 is located between the air nozzle sleeve 21 and the air nozzle valve core 22, control oil is introduced into the first annular groove 221, the control oil can be introduced between the first annular groove 221 and the second annular groove 222 to further seal and separate the gas containing cavity 213 and the control oil cavity 212, gas introduced into the gas containing cavity 213 and high-pressure gas generated by combustion in the cylinder and the control oil introduced into the control oil cavity 212 are further separated, and oil and gas mixing is prevented from occurring so as to avoid danger. In addition, the control oil introduced between the first annular groove 221 and the second annular groove 222 can lubricate the surfaces of the needle valve body 14 and the air nozzle sleeve 21, so that the air nozzle valve core 22 can slide smoothly along the needle valve body 14 and the air nozzle sleeve 21, and the smooth opening and closing of the air nozzle 211 can be guaranteed.
In this embodiment, the air injection assembly further includes a piezoelectric mechanism 23, and two ends of the piezoelectric mechanism 23 respectively abut against the air nozzle valve core 22 and the air nozzle sleeve 21 to push the air nozzle valve core 22 to slide. It should be noted that the piezoelectric mechanism 23 can deform and extend under the action of an applied voltage, and the specific structure and the action principle thereof are prior art in the field, and are not described in detail in this embodiment.
After the piezoelectric mechanism 23 is electrified, the resultant force of the control oil in the control oil cavity 212, the piezoelectric mechanism 23 and the gas in the gas containing cavity 213 acting on the gas nozzle valve core 22 can instantly push the gas nozzle valve core 22 away from the gas nozzle 211, so that the gas nozzle valve core 22 is separated from the gas nozzle sleeve 21, the gas containing cavity 213 is communicated with the gas nozzle 211, and the dual-fuel injector injects the gas outwards, so that the time for opening the gas nozzle 211 can be obviously shortened. The piezoelectric mechanism 23 can also make the control oil in the control oil cavity 212, the piezoelectric mechanism 23 (acting force is zero) and the fuel gas in the fuel gas cavity 213 act on the air nozzle valve core 22 after power failure, the closing force instantly pushes the air nozzle valve core 22 to be close to the air nozzle 211, the air nozzle valve core 22 is tightly abutted to the air nozzle sleeve 21, the fuel gas cavity 213 and the air nozzle 211 are cut off, the dual-fuel injector stops injecting fuel gas, the closing time of the air nozzle 211 can be obviously shortened, the dual-fuel injector is favorable for accurately controlling fuel gas injection, and the combustion performance of the engine can be further improved.
The dual-fuel injector provided by the embodiment is provided with the piezoelectric mechanism 23, the piezoelectric mechanism 23 is introduced on the basis of oil gas control by utilizing the working principle and method of oil gas control, the introduction of the piezoelectric mechanism 23 shortens the opening delay and the closing delay of the air nozzle valve core 22 in the air injection process, and shortens the time from opening to reaching the maximum lift of the air nozzle valve core 22.
The piezoelectric mechanism 23 is arranged in an inner cavity of the injector, longitudinal deformation is generated after the injector is electrified, theoretically, the deformation amount of the piezoelectric mechanism 23 can be adjusted by adjusting the electrified voltage, and then the acting force applied to the air nozzle valve core 22 by the piezoelectric mechanism 23 and the lift of the air nozzle valve core 22 are adjusted, the opening time, the opening delay time, the time for reaching the maximum lift, the closing time and the closing delay time of the air nozzle valve core 22 are influenced by the acting force applied to the air nozzle valve core 22 by the piezoelectric mechanism 23, and accurate control of gas injection can be influenced.
In addition, in the absence of the piezoelectric mechanism 23, the diameter range of the sealing surface where the air nozzle spool 22 contacts the air nozzle sleeve 21 needs to be closely matched to accommodate the opening and closing response of the air nozzle 211 on the injector. After the piezoelectric mechanism 23 is additionally arranged, the opening and closing of the air nozzle 211 on the ejector are optimized, the optional range of the diameter of the sealing surface of the air nozzle valve core 22 contacted with the air nozzle sleeve 21 is expanded, the matching requirement of the sealing surface is reduced, the structural arrangement of the sealing surfaces of the air nozzle sleeve 21 and the air nozzle valve core 22 is facilitated, and the processing technology of the air nozzle sleeve 21 and the air nozzle valve core 22 is improved.
Preferably, as shown in fig. 3, the piezoelectric mechanism 23 includes a plurality of piezoelectric pillars 231, and the plurality of piezoelectric pillars 231 are uniformly sandwiched between the air nozzle valve core 22 and the air nozzle sleeve 21 at intervals along the circumferential direction of the central axis of the needle valve body 14, so that the acting force on the air nozzle valve core 22 when the piezoelectric mechanism 23 is electrically deformed is uniformly distributed along the circumferential direction of the central axis of the needle valve body 14, and the air nozzle valve core 22 can be prevented from being jammed during the sliding process.
More preferably, as shown in fig. 4, an oil guide groove 232 is formed on a surface of the piezoelectric pillar 231, which is close to the air nozzle valve core 22, and the oil guide groove 232 is used for preventing the piezoelectric pillar 231 and the air nozzle valve core 22 from being adhered together. In the present embodiment, the surface of the piezoelectric column 231 is provided with the heat insulating layer, so that the performance of the piezoelectric mechanism 23 can be prevented from being damaged due to the excessively high temperature of the dual fuel injector, and the service life of the piezoelectric mechanism 23 can be prolonged.
In this embodiment, an air injection cavity 214 is disposed between the air nozzle sleeve 21 and the air nozzle valve core 22, the air injection cavity 214 is an annular cavity centered on the central axis of the needle valve body 14, the piezoelectric mechanism 23 is disposed in the air injection cavity 214, the air injection cavity 214 is communicated with the air nozzle 211, the air nozzle valve core 22 can be hermetically separated between the gas cavity 213 and the air injection cavity 214, and the air nozzle valve core 22 is used for controlling the communication or the closing between the gas cavity 213 and the air injection cavity 214, so that the dual-fuel injector can inject gas outwards or stop injecting gas. The piezoelectric mechanism 23 is arranged in the jet cavity 214, so that the volume of the jet cavity 214 can be effectively reduced, the dead volume during gas jet is effectively reduced, the number and the volume of the piezoelectric mechanism 23 are properly increased, the real dead volume can be zero, and the combustion performance and the emission performance of the engine can be improved.
More preferably, the shapes of the side surfaces of the piezoelectric posts 231 in sealing sliding contact with the air nozzle valve core 22 and the air nozzle sleeve 21 are circular arcs, so that the piezoelectric posts 231 are parallel to the contact surfaces of the air nozzle valve core 22 and the air nozzle sleeve 21, and the volume of each piezoelectric post 231 can be increased as much as possible within an allowable range to reduce the volume of the dead volume in the air injection cavity 214.
The air injection mechanism further comprises a control oil assembly, the control oil assembly comprises a control oil inlet 33, the control oil inlet 33 is communicated with the control oil cavity 212, and high-pressure control oil can be introduced into the control oil cavity 212 through the control oil inlet 33 to generate acting force towards the air injection port 211 on the air nozzle valve core 22. Preferably, the control oil assembly further includes a compression spring 31, the compression spring 31 is located in the control oil cavity 212, two ends of the compression spring 31 respectively abut against the needle valve body 14 and the air nozzle valve core 22, and the compression spring 31 can generate a force towards the air nozzle 211 on the air nozzle valve core 22 by virtue of its elastic restoring force.
In the present embodiment, as shown in fig. 5 and 6, the control oil inlet 33 communicates with the first ring groove 221 through the second control oil inlet oil passage 35 to enable the control oil to flow to the first ring groove 221 and the second ring groove 222 of the air nozzle spool 22. Specifically, the second control oil inlet duct 35 is provided on the needle valve body 14, and an oil inlet hole is further provided on the needle valve body 14, and the oil inlet hole is communicated between the second control oil inlet duct 35 and the first annular groove 221, so that the control oil can smoothly flow into the first annular groove 221 of the air faucet valve core 22.
Preferably, as shown in fig. 7, the control oil assembly further includes an oil-in throttle plate 34, the oil-in throttle plate 34 is communicated with the control oil inlet 33 through a first control oil-in oil channel 36, and the control oil inlet 33 is communicated with the control oil chamber 212 through the oil-in throttle plate 34, so that the high-pressure control oil entering from the control oil inlet 33 can enter the control oil chamber 212 after being throttled by the oil-in throttle plate 34. That is, the high-pressure control oil introduced through the control oil inlet 33 is divided into two paths, one path enters the control oil chamber 212 through the first control oil inlet oil passage 36 via the inlet orifice 34, and the other path flows into the first ring groove 221 and the second ring groove 222 through the second control oil inlet oil passage 35.
It should be noted that, because the piezoelectric mechanism 23 and the gas container 213 are both located on the side of the air nozzle valve core 22 close to the air nozzle 211, the acting forces of the piezoelectric mechanism 23 and the gas container on the air nozzle valve core 22 are both in the direction away from the air nozzle 211. Therefore, when the acting force of the compression spring 31, the control oil communicated in the control oil cavity 212, the piezoelectric mechanism 23 and the fuel gas communicated in the fuel gas containing cavity 213 act on the air nozzle valve core 22 together, the resultant force applied to the air nozzle valve core 22 may face a direction away from the air nozzle 211 or a direction away from the air nozzle 211, so that the air nozzle valve core 22 can slide back and forth to open and close the fuel gas containing cavity 213 and the air nozzle containing cavity 214, and finally the dual-fuel injector can inject the fuel gas outwards or stop injecting the fuel gas.
In this embodiment, the control oil assembly further includes a control oil valve assembly 32, the control oil valve assembly 32 is communicated with the control oil chamber 212 through a control oil return channel 322, and the control oil valve assembly 32 can release the high-pressure control oil in the control oil chamber 212 for adjusting the pressure of the control oil in the control oil chamber 212. Preferably, the control oil valve assembly 32 further includes a return orifice 321, and the control oil chamber 212 is communicated with the return orifice 321 through a control oil return channel 322 and finally communicated with a return tank, so that the control oil flows back to the return tank.
Preferably, the control oil valve assembly 32 further comprises a control oil sealing valve, the control oil sealing valve is opened when the control oil valve assembly 32 is powered on, and the high-pressure control oil in the control oil chamber 212 is depressurized through the control oil return passage 322; when the control oil valve assembly 32 is powered off, the control oil sealing valve is closed, the high-pressure control oil in the control oil chamber 212 cannot be decompressed, and the pressure of the high-pressure control oil in the control oil chamber 212 is high.
It should be noted that, when the dual-fuel injector injects fuel gas, the control oil valve assembly 32 is first powered on to open, the high-pressure control oil in the control oil chamber 212 performs a pressure relief process, and when the pressure in the control oil chamber 212 reaches a certain pressure in the pressure relief process, the piezoelectric mechanism 23 is powered on to deform, instantly pushes the air nozzle valve core 22 away from the air nozzle 211, and communicates the fuel gas containing cavity 213 with the air nozzle 211, in this process, the high-pressure control oil in the control oil chamber 212 is continuously depressurized, the speed of the air nozzle valve core 22 away from the air nozzle 211 is continuously increased, and the time for opening the air nozzle 211 is further shortened; when the dual fuel injector is closed to inject fuel gas, the control valve assembly 32 is de-energized, the pressure in the control gallery 212 increases, when the pressure in the control oil cavity 212 reaches a certain pressure in the boosting process, the piezoelectric mechanism 23 is powered off, the piezoelectric mechanism 23 recovers to the original size before charging, the acting force of the piezoelectric mechanism 23 on the air tap valve core 22 disappears instantly, so that the resultant force applied to the valve plug 22 is instantaneously changed to be towards the gas nozzle 211 to push the gas nozzle 211 to be close to the gas nozzle 211, the gas cavity 213 is disconnected from the gas nozzle 211, in the process, the high-pressure control oil in the control oil cavity 212 continuously rises, the speed of the air nozzle valve core 22 close to the air nozzle 211 is continuously increased, the closing time of the air nozzle 211 is further shortened, the accurate control of the dual-fuel injector on gas injection is further improved, and the combustion performance of the engine can be further improved.
It is worth saying that the dual-fuel injector can inject fuel oil only into the cylinder of the engine to enable the engine to carry out a pure fuel oil combustion mode, and can inject fuel oil and fuel gas into the cylinder of the engine to enable the engine to carry out a dual-fuel combustion mode in which fuel oil ignites fuel gas.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A dual fuel injector, comprising:
the fuel injection mechanism is characterized by comprising a fuel injection port (1) arranged at one end of the fuel injection mechanism, and the fuel injection mechanism can inject fuel outwards through the fuel injection port (1);
the gas injection mechanism comprises a gas injection assembly, the gas injection assembly comprises a gas nozzle sleeve (21), a gas injection port (211) is formed in the gas nozzle sleeve (21), the gas injection port (211) is used for injecting gas outwards, the gas nozzle sleeve (21) is sleeved at one end, provided with the oil injection port (1), of the oil injection mechanism at intervals, and a control oil cavity (212) and a gas containing cavity (213) are arranged between the gas nozzle sleeve (21) and the oil injection mechanism;
the gas nozzle valve core (22), the gas nozzle valve core (22) is clamped between the gas nozzle sleeve (21) and the oil injection mechanism in a sealing and sliding manner, the control oil cavity (212) is located on one side, away from the oil injection port (1), of the gas nozzle valve core (22), the gas containing cavity (213) is located on one side, close to the oil injection port (1), of the gas nozzle valve core (22), and the gas containing cavity (213) and the air injection port (211) can be separated in a sealing manner through the gas nozzle valve core (22);
piezoelectric mechanism (23), the both ends of piezoelectric mechanism (23) support respectively hold in air cock case (22) with on air cock cover (21), piezoelectric mechanism (23) can take place to warp under the applied voltage effect, lead to in control oil pocket (212) control oil piezoelectric mechanism (23) with the gas that leads to in gas appearance chamber (213) acts on jointly air cock case (22), make air cock case (22) can reciprocating motion in order to realize gas appearance chamber (213) with the break-make of jet orifice (211).
2. The dual fuel injector of claim 1, characterized in that a gas injection cavity (214) is provided between the nozzle sleeve (21) and the gas nozzle valve core (22), the piezoelectric mechanism (23) is disposed in the gas injection cavity (214), the gas injection cavity (214) is communicated with the gas injection port (211), and the gas nozzle valve core (22) can be hermetically separated between the gas injection cavity (213) and the gas injection cavity (214).
3. The dual fuel injector of claim 2, characterized in that the gas injection mechanism further comprises a control oil assembly, the control oil assembly comprises a compression spring (31), the compression spring (31) is located in the control oil cavity (212), and two ends of the compression spring (31) respectively abut against the oil injection mechanism and the gas nozzle valve core (22).
4. The dual fuel injector of claim 3, characterized in that the control oil assembly further comprises a control oil valve assembly (32) and a control oil inlet (33), the control oil inlet (33) being in communication with the control oil chamber (212), the control oil valve assembly (32) being for regulating a pressure of the control oil within the control oil chamber (212).
5. The dual fuel injector of claim 4 wherein the air nozzle poppet (22) is provided with a first annular groove (221) and a second annular groove (222) that are in communication with each other, the first annular groove (221) being in communication with the control oil inlet (33), the first annular groove (221) being located between the oil injection mechanism and the air nozzle poppet (22), and the second annular groove (222) being located between the air nozzle sleeve (21) and the air nozzle poppet (22).
6. The dual fuel injector of claim 4, characterized in that the control oil assembly further comprises an oil-in orifice plate (34), the oil-in orifice plate (34) communicating with the control oil inlet (33), the control oil inlet (33) communicating with the control oil chamber (212) through the oil-in orifice plate (34).
7. The dual fuel injector of claim 4, characterized in that the control oil valve assembly (32) comprises a return orifice (321), the control oil chamber (212) communicating with a return tank through the return orifice (321).
8. The dual fuel injector of claim 2, characterized in that the piezoelectric mechanism (23) comprises a plurality of piezoelectric columns (231), the plurality of piezoelectric columns (231) are all sandwiched between the air nozzle valve element (22) and the air nozzle sleeve (21), and the plurality of piezoelectric columns (231) are spaced in the air injection cavity (214).
9. The dual fuel injector of claim 8, characterized in that an oil guide groove (232) is formed in a surface of the piezoelectric column (231) close to the gas nozzle valve core (22), and the oil guide groove (232) is used for preventing the piezoelectric column (231) from being adhered to the gas nozzle valve core (22).
10. The dual fuel injector of claim 8, wherein a surface of the piezoelectric column (231) is provided with a thermal insulating layer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010955995.2A CN112081673A (en) | 2020-09-11 | 2020-09-11 | Dual-fuel injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010955995.2A CN112081673A (en) | 2020-09-11 | 2020-09-11 | Dual-fuel injector |
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| CN112081673A true CN112081673A (en) | 2020-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010955995.2A Pending CN112081673A (en) | 2020-09-11 | 2020-09-11 | Dual-fuel injector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115306600A (en) * | 2022-08-18 | 2022-11-08 | 一汽解放汽车有限公司 | Gas injection valve and car |
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| US20120187218A1 (en) * | 2011-01-26 | 2012-07-26 | Caterpillar Inc. | Dual fuel injector for a common rail system |
| US20150377197A1 (en) * | 2013-03-14 | 2015-12-31 | Tianjin University | Dual-channel piezoelectric injector |
| US20160061168A1 (en) * | 2014-09-03 | 2016-03-03 | Caterpillar Inc. | Single Actuator Fuel Injector for Duel Fuels |
| WO2018082855A1 (en) * | 2016-11-03 | 2018-05-11 | Robert Bosch Gmbh | Fuel injection valve for injecting a gaseous and/or liquid fuel |
| CN111594353A (en) * | 2020-05-15 | 2020-08-28 | 一汽解放汽车有限公司 | Dual-fuel injector and engine |
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| US20120187218A1 (en) * | 2011-01-26 | 2012-07-26 | Caterpillar Inc. | Dual fuel injector for a common rail system |
| US20150377197A1 (en) * | 2013-03-14 | 2015-12-31 | Tianjin University | Dual-channel piezoelectric injector |
| US20160061168A1 (en) * | 2014-09-03 | 2016-03-03 | Caterpillar Inc. | Single Actuator Fuel Injector for Duel Fuels |
| WO2018082855A1 (en) * | 2016-11-03 | 2018-05-11 | Robert Bosch Gmbh | Fuel injection valve for injecting a gaseous and/or liquid fuel |
| CN111594353A (en) * | 2020-05-15 | 2020-08-28 | 一汽解放汽车有限公司 | Dual-fuel injector and engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115306600A (en) * | 2022-08-18 | 2022-11-08 | 一汽解放汽车有限公司 | Gas injection valve and car |
| CN115306600B (en) * | 2022-08-18 | 2023-12-29 | 一汽解放汽车有限公司 | Gas injection valve and car |
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Application publication date: 20201215 |