CN112065593A - Dual-fuel injector and internal combustion engine - Google Patents
Dual-fuel injector and internal combustion engine Download PDFInfo
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- CN112065593A CN112065593A CN202010916282.5A CN202010916282A CN112065593A CN 112065593 A CN112065593 A CN 112065593A CN 202010916282 A CN202010916282 A CN 202010916282A CN 112065593 A CN112065593 A CN 112065593A
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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
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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
- F02D19/0694—Injectors operating with a plurality of fuels
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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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- 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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0248—Injectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
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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)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses a dual-fuel injector and an internal combustion engine, and belongs to the technical field of automobile internal combustion engines. The dual fuel injector includes an oil intake assembly; the second intermediate body is connected to the bottom end of the first intermediate body, the first oil duct and the second oil duct both penetrate through the first intermediate body and extend to the second intermediate body, and an air inlet channel for natural gas to flow into is formed in the second intermediate body; the oil injection control assembly is used for controlling oil injection and is arranged on the first intermediate body and the second intermediate body; the piezoelectric actuator is used for controlling air injection and is arranged on the second intermediate body and the transition piece; the injection assembly is used for injecting fuel oil or natural gas and is arranged at the other end of the long needle valve, the injection assembly comprises a needle valve body, a nozzle sleeve and a coupling sleeve, the nozzle sleeve is arranged on the outer side of the needle valve body, and the coupling sleeve is arranged between the needle valve body and the nozzle sleeve. The advantages are that: the fuel injection device can be compatible with independent control and injection of two fuels, and has the characteristics of high use value for users and high injection response speed.
Description
Technical Field
The invention relates to the technical field of automobile internal combustion engines, in particular to a dual-fuel injector and an internal combustion engine.
Background
An internal combustion engine is a power machine, which is a heat engine that directly converts heat energy released by burning fuel inside the machine into power. At present, diesel oil is mostly adopted as fuel in medium and heavy vehicle internal combustion engines, engineering machinery and marine internal combustion engines in the market, a small part of the diesel oil is used as fuel, an injector of the internal combustion engine can only inject single fuel of diesel oil or natural gas, namely, the internal combustion engine can only adopt one working mode of a diesel oil mode or a diesel oil natural gas ignition mode, when the price of the diesel oil or the natural gas fluctuates, a user cannot flexibly select the working mode of the internal combustion engine according to the real-time price of the fuel, the actual use value of the user is low, and the adaptability to the fuel is poor.
In order to solve the above problems, a dual fuel injector is adopted, a housing of the dual fuel injector is provided with a natural gas electromagnetic valve for controlling natural gas injection, a diesel electromagnetic valve for controlling diesel injection, and a valve body provided with a needle valve and an air valve inside; although the independent control and independent injection of diesel oil and natural gas dual fuels can be realized, the control flexibility of the fuels is higher; however, the natural gas electromagnetic valve on the fuel injector is arranged at the head of the dual-fuel injector, the gas valve is positioned at the bottom of the dual-fuel injector, and the gas valve control cavity penetrates through the shell of the dual-fuel injector, so that the volume of the gas valve control cavity is too large, the pressure change speed is slow, the injection response speed of the whole natural gas is slow, and the working efficiency of the internal combustion engine when the natural gas is used as fuel is low, and the structure is complex.
In view of the foregoing, it is desirable to design a dual fuel injector and an internal combustion engine to solve the above problems.
Disclosure of Invention
One objective of the present invention is to provide a dual fuel injector, which is compatible with independent control and injection of two fuels, and has the characteristics of high use value for users and high speed of injection response.
In order to achieve the purpose, the invention adopts the following technical scheme:
a dual fuel injector, the dual fuel injector comprising:
the fuel inlet assembly comprises a joint and a first intermediate body, wherein a first oil duct and a second oil duct for fuel inflow are arranged on the joint, and the joint is clamped at the top end of the first intermediate body;
the second intermediate body is connected to the bottom end of the first intermediate body, the first oil duct and the second oil duct both penetrate through the first intermediate body and extend to the second intermediate body, and an air inlet channel for natural gas to flow into is formed in the second intermediate body;
a transition piece connected at a bottom end of the second intermediate body;
the oil injection control assembly is arranged on the first intermediate body and the second intermediate body and comprises an electromagnet, an armature, a long needle valve and a valve sleeve which are magnetically connected, the valve sleeve is arranged at one end of the long needle valve, the valve sleeve is positioned at the bottom end of the armature, the other end of the long needle valve penetrates through the second intermediate body and extends towards the transition piece, a control cavity is formed between the valve sleeve and the one end of the long needle valve, a small sealing ball is arranged on an opening hole in the valve sleeve communicated with the control cavity, a middle hole cavity is formed between the outer side of the long needle valve and the second intermediate body and the transition piece, and the middle hole cavity is communicated with the first oil duct;
the piezoelectric actuator is arranged on the second intermediate body and the transition piece and comprises a piezoelectric crystal, a lower seat used for supporting the piezoelectric crystal and sealing valves arranged at the bottom end of the lower seat at intervals, and a piezoelectric crystal cavity is formed between the outer side of the piezoelectric crystal and the second intermediate body;
the injection assembly is arranged at the other end of the long needle valve and comprises a needle valve body, a nozzle sleeve and a coupling sleeve, the nozzle sleeve is arranged at the outer side of the needle valve body, the coupling sleeve is arranged between the needle valve body and the nozzle sleeve, a connecting piece is arranged between the needle valve body and the transition piece, a first oil inlet and an oil outlet with the flow rate larger than that of the first oil inlet are respectively arranged on the connecting piece, an oil injection hole for injecting fuel oil is arranged at the bottom end of the needle valve body, the other end of the long needle valve penetrates into the needle valve body through the transition piece and the connecting piece and is close to the oil injection hole, a gas cavity and a pressure regulating cavity are formed among the coupling sleeve, the nozzle sleeve and the needle valve body, and an air injection hole for injecting natural gas is arranged at one end, close to the gas cavity, on the nozzle sleeve, and the air injection hole extends towards the bottom end of the coupling sleeve, the gas cavity is communicated with the air inlet channel, one end of the pressure regulating cavity is connected with the piezoelectric crystal cavity through the oil outlet hole and the sealing valve, and the other end of the pressure regulating cavity is communicated with the second oil channel through the first oil inlet hole.
Preferably, the oil feed assembly further comprises:
and the joint tightening cap is arranged on the outer side of the first intermediate body and abuts against the joint so as to fasten the joint and the first intermediate body, so that the joint and the first intermediate body form a sealing pair at the abutting part so as to prevent fuel oil in the first oil passage and the second oil passage from mixing into the abutting part.
Preferably, the joint is further provided with a retainer ring and an O-ring for sealing fuel, and the retainer ring is used for preventing the O-ring from being squeezed into a gap between the joint and the first intermediate body under the action of the fuel.
Preferably, the piezoelectric actuator further comprises an upper seat, the upper seat is located at the top end of the piezoelectric crystal and matched with the conical surface of the piezoelectric crystal cavity, and the piezoelectric crystal is arranged in the square groove between the upper seat and the lower seat so as to avoid radial play of the piezoelectric crystal.
Preferably, a disc spring is arranged at the bottom end of the lower seat and is located at the top end of the transition piece, and the disc spring is used for providing an elastic force so as to separate the lower seat and the sealing valve from each other.
Preferably, a first spring is arranged in the sealing valve, and the first spring is used for providing a pre-tightening force so that the spherical surface of the head part of the sealing valve abuts against the conical surface of the transition piece to form a sealing pair.
Preferably, the inner cylindrical surface of the coupling sleeve and the needle valve body are coupled, the outer cylindrical surface of the coupling sleeve and the nozzle sleeve are coupled, and the bottom end surface of the coupling sleeve and the nozzle sleeve form a sealing pair to seal the gas injection hole.
Preferably, a conical surface sealing pair is formed between one end of the long needle valve, which is close to the oil injection hole, and the needle valve body so as to seal the oil injection hole.
Preferably, a second spring is arranged in the pressure regulating cavity and used for regulating the pressure in the pressure regulating cavity.
Another object of the present invention is to provide an internal combustion engine including a dual fuel injector that is compatible with independent control and injection of two fuels, and has the characteristics of high user value and high speed of injection response.
In order to achieve the purpose, the invention adopts the following technical scheme:
an internal combustion engine comprising the dual fuel injector as described above, the internal combustion engine further comprising a combustion chamber, the fuel injection orifices and the gas injection orifices both communicating with the combustion chamber.
The invention has the beneficial effects that:
the oil inlet assembly, the second intermediate body, the transition piece, the oil injection control assembly, the piezoelectric actuating mechanism and the injection assembly are arranged; when the working mode of the dual-fuel injector is required to be a fuel mode, fuel enters through a first oil duct on the joint, and the first oil duct is communicated with the middle hole cavity after passing through a first intermediate body and a second intermediate body so that the fuel flows into the middle hole cavity; then the electromagnet is electrified, the armature iron is vertically lifted upwards under the action of the electromagnetic force of the electromagnet, so that fuel oil enters the periphery of the valve sleeve through the middle hole cavity, the fuel oil can open the small sealing balls on the valve sleeve due to certain pressure of the fuel oil, so that the opening hole communicated with the control cavity on the valve sleeve is opened, so that the pressure in the control cavity is reduced, and the fuel oil with certain pressure is always arranged in the middle hole cavity outside the long needle valve, namely the long needle valve is lifted under the upward acting force of the fuel oil to open the fuel injection hole, so that the fuel oil in the middle hole cavity is injected into a combustion chamber through a gap between the end part of the long needle valve and the needle valve body and the fuel injection hole in the needle valve body, so that combustion work is performed, and the working mode of pure; when the working mode of the dual-fuel injector is a fuel oil natural gas ignition mode, a small amount of fuel oil needs to be injected into the combustion chamber in advance through a pure fuel oil working mode, so that the fuel oil is only used as a pilot fuel to ignite natural gas in the working mode of igniting natural gas by fuel oil; then the control fuel oil enters through a second oil duct on the joint, the second oil duct is communicated with the pressure regulating cavity after sequentially passing through the first intermediate, the second intermediate, the transition piece and the connecting piece, and the control fuel oil flows into the pressure regulating cavity through a first oil inlet hole on the connecting piece; applying a certain voltage to the piezoelectric crystal to enable the piezoelectric crystal to generate a certain longitudinal deformation so as to push the lower seat to vertically move downwards, wherein the driving force generated by the piezoelectric crystal under the driving of the voltage is large, so that the lower seat can be pushed to the lower seat to be in contact with the sealing valve, the sealing valve is pushed to vertically move downwards, the sealing valve is opened, and at the moment, the control fuel in the pressure regulating cavity flows into the piezoelectric crystal cavity through the transition piece through the oil outlet hole in the connecting piece and flows back to the low-pressure oil channel from the piezoelectric crystal cavity to the oil tank; because the flow of the first oil inlet hole is smaller than that of the oil outlet hole, the inflow quantity of the control fuel oil in the pressure regulating cavity is smaller than the outflow quantity under the state that the sealing valve is opened, namely the pressure in the pressure regulating cavity is reduced; when the pressure in the pressure regulating cavity is reduced to a certain degree, the bottom end of the coupling sleeve can overcome the hydraulic pressure of the control fuel in the pressure regulating cavity under the upward acting force of the natural gas, so that the coupling sleeve moves upwards to open the gas orifice, and the natural gas entering the gas cavity through the gas inlet channel on the second intermediate body enters the gas orifice to the combustion chamber through the gap between the coupling sleeve and the nozzle sleeve; at the moment, a small amount of pilot fuel oil which is pre-injected into the combustion chamber quickly pilots a large amount of injected natural gas so that the natural gas burns and works to realize the working mode of the fuel oil pilot natural gas of the dual-fuel injector; the fuel and natural gas dual-fuel independent control and independent injection can be realized, so that the control flexibility of the fuel is higher, the use value of a user is higher, and the structure is simple; the position of the piezoelectric actuating mechanism is close to the injection assembly, the connecting piece provided with the first oil inlet hole and the first oil outlet hole is arranged between the piezoelectric actuating mechanism and the injection assembly, the length of control fuel oil between the pressure regulating cavity and the piezoelectric actuating mechanism is greatly shortened, the pressure regulating cavity is only arranged on the part of the injection assembly, the volume of the pressure regulating cavity is reduced to the maximum extent, the response capability of the dual-fuel injector in a natural gas working mode is remarkably improved, and the working efficiency of the internal combustion engine is higher when natural gas is used as the fuel.
Drawings
FIG. 1 is a cross-sectional view of a dual fuel injector provided by the present invention;
FIG. 2 is a cross-sectional view of a left side view of the dual fuel injector provided by the present invention;
FIG. 3 is a schematic structural diagram of a piezoelectric actuator provided in accordance with the present invention;
fig. 4 is a schematic structural view of a spray assembly provided by the present invention.
Description of reference numerals:
1-an oil intake assembly; 11-a linker; 111-a second oil inlet; 112-a third oil inlet hole; 12-fitting a cap; 13-a retainer ring; 14-O-ring; 15-a first intermediate; 211-a first oil passage; 212-a second oil passage;
21-a second intermediate; 22-a transition piece; 23-a connector; 231-a first oil inlet hole; 232-oil outlet; 24-nozzle locking cap; 26-tightening the cap by the upper body and the lower body; 213-an air inlet; 214-an intake duct; 215-oil return; 216-a central bore;
3-a spray assembly; 31-needle valve body; 32-a nozzle sleeve; 33-a coupling sleeve; 34-a second spring; 36-a pressure regulating cavity; 37-a gas chamber; 311-oil spray holes; 321-gas injection holes;
4-a piezoelectric actuator; 41-piezoelectric crystal; 42-upper seat; 43-lower seat; 44-a sealing valve; 45-disc spring; 46-a first spring; 47-piezoelectric crystal cavity;
5-oil injection control component; 51-an electromagnet; 52-an armature; 55-sealing the pellet; 56-a valve housing; 57-control chamber; 58-Long needle valve.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features. Like reference numerals refer to like elements throughout the specification.
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.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.
In the embodiment, a dual-fuel injector and an internal combustion engine comprising the same are provided. The internal combustion engine further comprises a combustion chamber (not shown in the figure), and the combustion chamber is communicated with the oil injection hole 311 for injecting fuel oil and the gas injection hole 321 for injecting natural gas on the dual-fuel injector, so that the fuel oil or the natural gas can perform combustion work in the combustion chamber. In this embodiment, the fuel is diesel.
Particularly, the dual-fuel injector is provided with two working modes of a fuel oil mode and a fuel oil natural gas ignition mode, so that when the prices of fuel oil and natural gas fluctuate, a user can flexibly select the working modes according to the real-time prices of the fuel oil or the natural gas, and higher use value is brought to the user.
Further, as shown in fig. 1-3, the dual fuel injector includes an oil intake assembly 1, a second intermediate 21, a transition piece 22, and a fuel injection control assembly 5 for controlling fuel injection. The oil inlet assembly 1 comprises a joint 11 and a first intermediate body 15, wherein a first oil duct 211 and a second oil duct 212 for fuel oil to flow into are arranged on the joint 11, the first oil duct 211 is used for main fuel oil to flow into, the second oil duct 212 is used for controlling fuel oil to flow into, the fuel oil is controlled not to participate in combustion work, and the fuel oil is only used as a hydraulic source to control the injection of natural gas; and a second oil inlet hole 111 communicating with the first oil passage 211 is provided at the top end of the joint 11, and a third oil inlet hole 112 communicating with the second oil passage 212 is provided at the side of the joint 11; the joint 11 is clamped at the top end of the first intermediate body 15, the second intermediate body 21 is fixedly connected at the bottom end of the first intermediate body 15, and the transition piece 22 is fixedly connected at the bottom end of the second intermediate body 21; the first oil passage 211 passes through the first intermediate body 15 and extends to the second intermediate body 21, and the second oil passage 212 passes through the first intermediate body 15 and the second intermediate body 21 in sequence and extends to the transition piece 22; an inlet 214 for inflow of natural gas is arranged on the second intermediate body 21, the inlet 214 extends to the transition piece 22, and an inlet 213 communicated with the inlet 214 is arranged on the side surface of the second intermediate body 21; the oil injection control assembly 5 is arranged on the first intermediate body 15 and the second intermediate body 21, the oil injection control assembly 5 comprises an electromagnet 51, an armature 52, a long needle valve 58 and a valve sleeve 56 which are vertically arranged, the valve sleeve 56 is located at the bottom end of the armature 52, the valve sleeve 56 is arranged at one end of the long needle valve 58, one end of the long needle valve 58 is matched with an inner cavity hole in the valve sleeve 56, the other end of the long needle valve 58 penetrates through the second intermediate body 21 and extends towards the transition piece 22, a control cavity 57 is formed between the valve sleeve 56 and one end of the long needle valve 58, a small sealing ball 55 is arranged on an opening hole in the valve sleeve 56, which is communicated with the control cavity 57, a middle cavity 216 is formed between the outer side of the long needle valve 58 and the second intermediate body 21 and the transition piece 22, and the middle cavity 216 is communicated with the first oil passage 211 and is. Wherein, the first intermediate body 15 and the second intermediate body 21 are fastened and connected through the upper and lower fastening caps 26 and the positioning pins; the second intermediate body 21, the transition piece 22, the connecting piece 23 and the needle valve body 31 are tightly connected by the nozzle locking cap 24.
Wherein the radial space of the dual fuel injector is fully utilized by introducing both the first oil channel 211 and the second oil channel 212 from the topmost end of the entire dual fuel injector through the same joint 11, which can facilitate the installation of the entire dual fuel injector in the cylinder head on the internal combustion engine.
Further, as shown in fig. 1, the dual fuel injector further includes a piezoelectric actuator 4 and an injection assembly 3. The piezoelectric actuator 4 is arranged on the second intermediate body 21 and the transition piece 22, the piezoelectric actuator 4 comprises a piezoelectric crystal 41, a lower seat 43 for supporting the piezoelectric crystal 41 and sealing valves 44 arranged at the bottom end of the lower seat 43 at intervals, the top end of the sealing valve 44 is in contact with an inner hole on the top end of the transition piece 22 and forms a conical surface sealing pair, and a piezoelectric crystal cavity 47 is formed between the outer side of the piezoelectric crystal 41 and the second intermediate body 21; the injector assembly 3 is disposed on the end of the long needle valve 58 where the valve sleeve 56 is not disposed. As shown in fig. 4, the injection assembly 3 includes a needle valve body 31, a nozzle sleeve 32 and a coupling sleeve 33, the nozzle sleeve 32 is disposed outside the needle valve body 31, the coupling sleeve 33 is disposed between the needle valve body 31 and the nozzle sleeve 32, as shown in fig. 1 and 4, a connecting member 23 is disposed between the needle valve body 31 and the transition member 22, a first oil inlet 231 and an oil outlet 232 with a flow rate greater than that of the first oil inlet 231 are respectively disposed on the connecting member 23, an oil outlet 311 is disposed at the bottom end of the needle valve body 31, and one end of the long needle valve 58, which is not provided with the valve sleeve 56, penetrates the transition member 22 and the connecting member 23 and then penetrates the needle valve body 31 and is close to the oil outlet 311, a gas chamber 37 and a pressure regulating chamber 36 are formed between the coupling sleeve 33, the nozzle sleeve 32 and the needle valve body 31, an air injection hole 321 is disposed at one end of the nozzle sleeve 32 close to the gas chamber 37, the bottom end of the coupling sleeve 33 abuts, and the air injection hole 321 extends towards the bottom end of the coupling sleeve 33; the gas chamber 37 communicates with the intake passage 214, and the pressure regulating chamber 36 has one end connected to the piezoelectric crystal chamber 47 through the oil outlet hole 232 and the sealing valve 44 and the other end communicating with the second oil passage 212 through the first oil inlet hole 231. The first oil inlet 231 and the first oil outlet 232 are both arranged on the connecting piece 23, so that the processing and the flow control can be facilitated; and the proportion scope of the flow between first inlet 231 and the oil outlet 232 is 0.5 ~ 0.9, can control the pressure in the pressure regulating chamber 36 more fast to make fumarole 321 can open more fast, with can have faster response speed to the injection of natural gas. The piezoelectric crystal 41 is a non-centrosymmetric crystal, the piezoelectric crystal 41 is deformed under the action of a mechanical force, so that charged particles are relatively displaced, and thus positive and negative bound charges appear on the surface of the crystal, and the piezoelectric crystal 41 has an inverse piezoelectric effect (electrostrictive effect); the inverse piezoelectric effect of the piezoelectric crystal 41 means that an electric field is applied to the piezoelectric crystal 41, and the piezoelectric crystal 41 generates mechanical deformation in a certain direction; when the applied electric field is removed, the mechanical deformation of the piezoelectric crystal 41 is eliminated.
The oil inlet assembly 1, the first intermediate body 15, the second intermediate body 21, the transition piece 22, the oil injection control assembly 5, the piezoelectric actuator 4 and the injection assembly 3 are arranged. When the working mode of the dual-fuel injector is required to be a fuel oil mode, at the moment, the fuel injection hole 311 and the gas injection hole 321 are sealed and not opened; the main fuel oil enters the first oil passage 211 through the second oil inlet hole 111 on the joint 11, the first oil passage 211 is communicated with the middle hole cavity 216 through the first intermediate body 15 and the second intermediate body 21, and the main fuel oil flows into the middle hole cavity 216; the electromagnet 51 is then energized, and the armature 52 is lifted vertically upward by the electromagnetic force of the electromagnet 51, so that the main fuel in the intermediate bore 216 enters around the valve sleeve 56, because the main fuel has some pressure, the main fuel can open the sealing bead 55 on the valve sleeve 56, to open the opening in the valve housing 56, which communicates with the control chamber 57, to allow the pressure in the control chamber 57 to decrease, and since there is always main fuel at a certain pressure in the middle bore 216 outside the long needle valve 58, that is, the needle valve 58 is lifted up by the upward force of the main fuel for the period of time, to open the injection hole 311, so that the main fuel in the middle hole cavity 216 enters the fuel injection hole 311 arranged on the needle valve body 31 through the gap between the end of the long needle valve 58 and the needle valve body 31 and is injected into a combustion chamber to perform combustion work, and the pure fuel operation mode of the dual-fuel injector is realized.
When the operating mode of the dual-fuel injector is a fuel oil natural gas ignition mode, at this time, the gas injection hole 321 and the oil injection hole 311 are sealed and not opened, and a small amount of fuel oil needs to be injected into the combustion chamber in advance through a pure fuel oil operating mode, so that in the operating mode of the fuel oil natural gas ignition, the fuel oil is only used as the ignition fuel to ignite the natural gas.
The control fuel enters the second oil channel 212 through the third oil inlet hole 112 on the side surface of the joint 11, and the second oil channel 212 sequentially passes through the first intermediate body 15, the second intermediate body 21, the transition piece 22 and the connecting piece 23 and then is communicated with the pressure regulating cavity 36, so that the control fuel flows into the pressure regulating cavity 36 through the first oil inlet hole 231 on the connecting piece 23; natural gas enters the gas inlet channel 214 through the gas inlet 213 on the side surface of the second intermediate body 21 and enters the gas cavity 37 through the transition piece 22 and the connecting piece 23 in sequence, and the pressure of the control fuel in the pressure regulating cavity 36 is slightly higher than the pressure of the natural gas in the gas cavity 37, namely, at this time, the gas injection hole 321 is in a sealed state; applying a certain electric field to the piezoelectric crystal 41, so that the piezoelectric crystal 41 generates a certain longitudinal deformation under the action of the electric field to push the lower seat 43 to move vertically downward, and since the driving force generated by the piezoelectric crystal 41 under the driving of the electric field is large, the lower seat 43 can be pushed to the lower seat 43 to be in contact with the sealing valve 44, so that the sealing valve 44 is pushed to move vertically downward, so that the top end of the sealing valve 44 is far away from the inner hole on the top end of the transition piece 22, and the inner hole on the top end of the transition piece 22 is opened; at this time, the control fuel in the pressure regulating cavity 36 can flow through the oil outlet 232 on the connecting piece 23 and the inner hole on the transition piece 22, pass through the transition piece 22, enter the piezoelectric crystal cavity 47, and an oil return channel 215 communicated with the low-pressure oil passage is arranged on the side surface of the piezoelectric crystal cavity 47, so that the control fuel in the piezoelectric crystal cavity 47 flows back to the low-pressure oil passage to the oil tank through the oil return channel 215; since the flow rate of the first oil inlet hole 231 is smaller than the flow rate of the oil outlet hole 232, the inflow amount of the control fuel in the pressure-regulating chamber 36 is smaller than the outflow amount, i.e., the pressure in the pressure-regulating chamber 36 is reduced, in the state where the sealing valve 44 is opened; when the pressure in the pressure regulating cavity 36 is reduced to a certain degree, the bottom end of the coupling sleeve 33 can overcome the hydraulic pressure of the control fuel in the pressure regulating cavity 36 under the upward acting force of the natural gas in the fuel gas cavity 37, so that the coupling sleeve 33 moves upward to open the gas injection hole 321, and the natural gas enters the gas injection hole 321 into the combustion chamber through the gap between the coupling sleeve 33 and the nozzle sleeve 32; at the moment, a small amount of pilot fuel oil which is pre-injected into the combustion chamber quickly pilots a large amount of injected natural gas so that the natural gas burns and works, and the working mode of the fuel oil pilot natural gas of the dual-fuel injector is realized.
The dual-fuel injector can realize the independent control and the independent injection of the fuel oil and the natural gas, so that the control flexibility of the fuel is higher, a user can determine the working mode of the dual-fuel injector according to the real-time prices of the fuel oil and the natural gas, the user has higher use value and the structure is simple; the position of the piezoelectric actuator 4 is close to the injection assembly 3, and the connecting piece 23 provided with the first oil inlet 231 and the oil outlet 232 is arranged between the piezoelectric actuator 4 and the injection assembly 3, so that the length of control fuel oil between the pressure regulating cavity 36 and the sealing valve 44 is greatly shortened, the pressure regulating cavity 36 is only arranged on the part of the injection assembly 3, the volume of the pressure regulating cavity 36 is reduced to the maximum extent, the response capability of the dual-fuel injector in a natural gas working mode is remarkably improved, and the working efficiency of the internal combustion engine when natural gas is used as fuel is high; meanwhile, the piezoelectric crystal 41 made of the piezoelectric material is arranged, so that when an external electric field is applied to the piezoelectric crystal 41, the piezoelectric crystal 41 can quickly generate longitudinal deformation to generate a large driving force, the sealing valve 44 can be quickly and accurately opened and closed, the pressure in the pressure regulating cavity 36 can be quickly reduced, the coupling sleeve 33 can quickly move upwards, natural gas in the gas cavity 37 can be quickly ejected from the gas ejecting hole 321, the whole gas ejecting process is quick in response, and accurate control of natural gas is realized.
Wherein, a connecting piece 23 is arranged between the needle valve body 31 and the transition piece 22, and a first oil inlet 231 and an oil outlet 232 with a flow rate larger than that of the first oil inlet 231 are respectively arranged on the connecting piece 23; the connecting piece 23 with the pressure regulating function is arranged at one end close to the injection assembly 3, so that the volume of the pressure regulating cavity 36 can be effectively reduced, and the response capability of natural gas injection when the dual-fuel injector works in a natural gas mode is further improved.
Further, as shown in fig. 1, the oil inlet assembly 1 further includes a joint tightening cap 12, the joint tightening cap 12 is screwed on the outer side of the first intermediate body 15 and abuts against the joint 11 to fasten the joint 11 and the first intermediate body 15, so that a high-pressure sealing pair is formed at the abutting position of the spherical surface of the joint 11 and the conical surface of the first intermediate body 15, and main fuel oil in the first oil passage 211 and control fuel oil in the second oil passage 212 are prevented from mixing into each other at the abutting position, so as to isolate the first oil passage 211 from the second oil passage 212; and the joint 11 is also provided with a retaining ring 13 and an O-ring 14 for sealing fuel, and the retaining ring 13 can prevent the O-ring 14 from being extruded into a gap between the joint 11 and the first intermediate body 15 after being deformed in the process of rapidly flowing the high-pressure fuel in the first oil passage 211 or the second oil passage 212, so as to ensure the sealing effect of the O-ring 14 on the fuel and avoid the problem of sealing failure. The function of the sealing pair is to ensure a sealing effect, thereby preventing fuel from leaking between the adjacent joint surfaces and preventing foreign substances such as dust and moisture from intruding into the interior of the joint 11.
Further, as shown in fig. 1 and 3, the piezoelectric actuator 4 further includes an upper seat 42, the upper seat 42 is located in cooperation with the conical surface of the piezoelectric crystal cavity 47, and the piezoelectric crystal 41 is located in the square groove between the upper seat 42 and the lower seat 43, so as to prevent the piezoelectric crystal 41 from moving radially during the whole movement process; a disc spring 45 is arranged at the bottom end of the lower seat 43, the disc spring 45 is positioned at the top end of the transition piece 22, and the disc spring 45 is used for providing elastic force after the piezoelectric crystal 41 is powered off so as to separate the lower seat 43 from the sealing valve 44; meanwhile, the disc spring 45 can also provide pretightening force, so that before the piezoelectric crystal 41 is electrified, the piezoelectric crystal 41, the upper seat 42 and the lower seat 43 can be fixed in the piezoelectric crystal cavity 47 under the pretightening force of the disc spring 45; and a first spring 46 is arranged in the sealing valve 44, and the first spring 46 adjusts the opening pressure of the sealing valve 44 by providing a pre-tightening force, so that the spherical surface of the head part of the sealing valve 44 abuts against the inner hole conical surface of the transition piece 22 under the pre-tightening force of the first spring 46 to form a sealing pair. In this embodiment, the first spring 46 is a pressure regulating spring.
Specifically, the inner cylindrical surface of the coupling sleeve 33 and the needle valve body 31 are coupled, the outer cylindrical surface of the coupling sleeve 33 and the nozzle sleeve 32 are coupled, and the bottom end surface of the coupling sleeve 33 and the nozzle sleeve 32 form a sealing pair to seal the gas injection hole 321, so that the gas injection hole 321 is always in a sealed state when gas injection is not performed, and the oil injection process is prevented from being influenced; a conical surface sealing pair is formed between one end of the long needle valve 58 close to the oil injection hole 311 and the needle valve body 31 to seal the oil injection hole 311, so that the oil injection hole 311 is always in a sealed state when oil injection is not performed, and the oil injection process is prevented from being influenced; meanwhile, as shown in fig. 4, a second spring 34 is arranged in the pressure regulating cavity 36, and the second spring 34 is used for regulating the pressure in the pressure regulating cavity 36, so that the bottom end surface of the coupling sleeve 33 and the contact surface of the nozzle sleeve 32 form a sealing pair, and further, the air injection hole 321 is always in a closed state before air injection is performed. Wherein, the mutual coupling parts refer to mutually-matched and high-requirement shaft hole matching parts. In this embodiment, the second spring 34 is a pressure regulating spring.
The specific fuel injection operation of the dual fuel injector in this embodiment is as follows: the fuel injection process of the dual-fuel injector is controlled by an electromagnet 51 in the fuel injection control assembly 5; first, the main fuel is caused to enter the first oil passage 211 through the second oil inlet hole 111 on the top end of the joint 11, and to flow into the middle hole chamber 216 through the first intermediate body 15 and the second intermediate body 21; then, the electromagnet 51 is energized, the armature 52 moves vertically upward under the electromagnetic force of the electromagnet 51, and since the main fuel has a certain pressure, that is, at this time, the main fuel in the middle cavity 216 can move to the valve sleeve 56, and the small sealing ball 55 on the valve sleeve 56 is opened under the pressure of the main fuel to open the opening hole on the valve sleeve 56, the pressure in the control cavity 57 formed by the valve sleeve 56 and the long needle valve 58 on the top end of the long needle valve 58 decreases, while the outer sides of the middle part and the bottom end of the long needle valve 58 are filled with the main fuel with a certain pressure, and the two ends of the long needle valve 58 move vertically upward under the upward force of the main fuel under the pressure difference, so that a gap is generated between the bottom end of the long needle valve 58 and the fuel injection hole 311 on the needle valve body 31; finally, the main fuel oil moves to the fuel injection hole 311 of the needle valve body 31 through the generated clearance, and is injected into the combustion chamber through the fuel injection hole 311 to perform combustion work.
When oil injection needs to be stopped, the electromagnet 51 is powered off, the armature 52 moves downwards vertically under the action of the electromagnetic force without the electromagnetic force of the electromagnet 51 to flow the main fuel around the valve sleeve 56 back into the middle hole cavity 216, the sealing small ball 55 returns to the original position to close the opening hole on the valve sleeve 56, namely the pressure in the control cavity 57 on the top end of the long needle valve 58 is increased, the pressure in the control cavity 57 pushes the long needle valve 58 to move downwards vertically until the bottom end of the long needle valve 58 contacts with the conical surface of the needle valve body 31 to form a sealing pair again to close the oil injection hole 311, and the whole oil injection process is finished.
The oil injection process of the oil injection hole 311 can be used as a pure fuel mode, and fuel oil is used as main fuel to perform combustion work; the fuel oil can be used as the ignition fuel to ignite the natural gas under the mode that the fuel oil ignites the natural gas; that is, before the injection of the natural gas is required, a small amount of fuel for igniting the natural gas is injected into the combustion chamber through the injection process of the injection hole 311.
The specific operation of the dual fuel injector in this embodiment for injecting natural gas is as follows: the injection process of the dual-fuel injector is controlled by the piezoelectric actuator 4 indirectly to inject natural gas by controlling the pressure of control fuel oil in a pressure regulating cavity 36 in the injection assembly 3; firstly, natural gas flows into the gas inlet channel 214 from the gas inlet 213 on the side surface of the second intermediate body 21, passes through the second intermediate body 21, the transition piece 22 and the connecting piece 23, and enters the gas chamber 37 formed by the coupling sleeve 33, the needle valve body 31 and the nozzle sleeve 32; meanwhile, the control fuel enters the second oil passage 212 from the third oil inlet hole 112 on the side surface of the joint 11, sequentially passes through the first intermediate body 15, the second intermediate body 21, the transition piece 22 and the first oil inlet hole 231 on the connecting piece 23, and enters the pressure regulating cavity 36 formed by the coupling sleeve 33, the needle valve body 31 and the nozzle sleeve 32, and the coupling sleeve 33 is positioned between the pressure regulating cavity 36 and the fuel gas cavity 37; because the pressure of the control fuel in the pressure regulating chamber 36 is slightly higher than the pressure of the natural gas in the gas chamber 37, under the action of the pressure of the control fuel in the pressure regulating chamber 36 and the pre-tightening force of the second spring 34, the coupling sleeve 33 remains stationary, i.e., the bottom end surface of the coupling sleeve 33 contacts the nozzle sleeve 32 to form a sealing pair, and the gas injection hole 321 is still in a closed state.
When a certain external electric field is applied to the piezoelectric crystal 41 in the piezoelectric actuator 4, the piezoelectric crystal 41 has an inverse piezoelectric effect, and will generate a certain longitudinal deformation under the action of the electric field, and the generated longitudinal deformation can push the lower seat 43 at the bottom end of the piezoelectric crystal 41 to overcome the upward acting force of the disc spring 45 and move vertically downward; because the driving force generated by the piezoelectric crystal 41 under the driving of the electric field is large, the resultant force of the pre-tightening force of the disc spring 45, the pre-tightening force of the first spring 46, and the hydraulic force applied to the sealing valve 44 from the pressure regulating chamber 36 to control the fuel oil to move vertically upward can be overcome, so that the piezoelectric crystal 41 can continuously push the lower seat 43 to move, and when the lower seat 43 moves to be in contact with the sealing valve 44, the lower seat 43 can push the sealing valve 44 to move downward, so as to open the sealing valve 44; at this time, the control fuel in the pressure regulating cavity 36 flows through the transition piece 22 through the oil outlet 232 on the connecting piece 23, enters the piezoelectric crystal cavity 47, flows back to the low-pressure oil passage through the oil return passage 215 in the piezoelectric crystal cavity 47 and flows back to the oil tank; since the flow rate of the first oil inlet hole 231 on the connection member 23 is smaller than the flow rate of the oil outlet hole 232, when the sealing valve 44 is opened, the inflow of the control fuel into the pressure regulating chamber 36 is smaller than the outflow, and the pressure in the pressure regulating chamber 36 is lowered; when the pressure in the pressure regulating cavity 36 is reduced to a certain degree, the coupling sleeve 33 can overcome the resultant force of the hydraulic pressure of the control fuel in the pressure regulating cavity 36 on the top end of the coupling sleeve 33 and the pretightening force of the second spring 34 under the upward acting force of the natural gas in the fuel gas cavity 37 at the bottom end, and the coupling sleeve 33 starts to move upwards, so that a gap is formed between the coupling sleeve 33 and the nozzle sleeve 32 to open the gas orifice 321; the natural gas in the gas chamber 37 flows to the gas ejection holes 321 through the gap that occurs between the coupling sleeve 33 and the nozzle sleeve 32, and is ejected through the gas ejection holes 321 to enter the combustion chamber; at this time, a small amount of fuel for ignition, which is injected in advance into the combustion chamber, quickly ignites a large amount of natural gas that is injected, and the natural gas burns to do work.
When the air injection needs to be stopped, the external electric field to the piezoelectric crystal 41 is cut off, so that the piezoelectric crystal 41 is restored to the size before the electric field is applied, the lower seat 43 moves upwards under the elastic force of the disc spring 45, the lower seat 43 and the sealing valve 44 are separated from each other, the sealing valve 44 moves upwards under the hydraulic pressure of the control fuel in the pressure regulating cavity 36 and the elastic force of the first spring 46 until contacting with the inner hole conical surface of the transition block to form a sealing pair again, the control fuel in the pressure regulating cavity 36 only flows in but not flows out, so that the pressure of the control fuel in the pressure regulating cavity 36 is rapidly increased, the coupling sleeve 33 can move downwards under the pressure of the control fuel increased in the pressure regulating cavity 36 and the acting force of the second spring 34 by overcoming the gas pressure in the gas cavity 37 at the bottom end of the coupling sleeve 33, so that the coupling sleeve 33 contacts with the nozzle sleeve 32 to form the sealing pair again to close the air injection hole 321, the whole air injection process is finished.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (10)
1. A dual fuel injector, characterized in that the dual fuel injector comprises:
the fuel inlet assembly (1) comprises a joint (11) and a first intermediate body (15), wherein a first oil duct (211) and a second oil duct (212) for fuel inflow are arranged on the joint (11), and the joint (11) is clamped at the top end of the first intermediate body (15);
a second intermediate body (21) connected to the bottom end of the first intermediate body (15), wherein the first oil passage (211) and the second oil passage (212) both penetrate through the first intermediate body (15) and extend to the second intermediate body (21), and an inlet passage (214) for inflow of natural gas is arranged on the second intermediate body (21);
a transition piece (22) connected at a bottom end of the second intermediate body (21);
an oil injection control assembly (5) arranged on the first intermediate body (15) and the second intermediate body (21), wherein the oil injection control assembly (5) comprises an electromagnet (51) and an armature (52) which are magnetically connected, a long needle valve (58) and a valve sleeve (56), the valve sleeve (56) is arranged at one end of the long needle valve (58), the valve sleeve (56) is arranged at the bottom end of the armature (52), the other end of the long needle valve (58) penetrates through the second intermediate body (21) and extends towards the transition piece (22), a control cavity (57) is formed between the valve sleeve (56) and one end of the long needle valve (58), a sealing small ball (55) is arranged on an opening hole communicated with the control cavity (57) on the valve sleeve (56), a middle hole cavity (216) is formed between the outer side of the long needle valve (58) and the second intermediate body (21) and the transition piece (22), the center bore (216) is communicated with the first oil passage (211);
a piezoelectric actuator (4) arranged on the second intermediate body (21) and the transition piece (22), wherein the piezoelectric actuator (4) comprises a piezoelectric crystal (41), a lower seat (43) for supporting the piezoelectric crystal (41) and a sealing valve (44) arranged at the bottom end of the lower seat (43) at intervals, and a piezoelectric crystal cavity (47) is formed between the outer side of the piezoelectric crystal (41) and the second intermediate body (21);
the injection assembly (3) is arranged at the other end of the long needle valve (58), the injection assembly (3) comprises a needle valve body (31), a nozzle sleeve (32) and a coupling sleeve (33), the nozzle sleeve (32) is arranged on the outer side of the needle valve body (31), the coupling sleeve (33) is arranged between the needle valve body (31) and the nozzle sleeve (32), a connecting piece (23) is arranged between the needle valve body (31) and the transition piece (22), a first oil inlet (231) and an oil outlet (232) with the flow rate larger than that of the first oil inlet (231) are respectively arranged on the connecting piece (23), an oil injection hole (311) for injecting fuel oil is arranged at the bottom end of the needle valve body (31), and the other end of the long needle valve (58) penetrates through the needle valve body (31) after passing through the transition piece (22) and the connecting piece (23) and approaches to the oil injection hole (311), a gas cavity (37) and a pressure regulating cavity (36) are formed among the coupling sleeve (33), the nozzle sleeve (32) and the needle valve body (31), a gas injection hole (321) for injecting natural gas is formed in one end, close to the gas cavity (37), of the nozzle sleeve (32), the gas injection hole (321) extends towards the bottom end of the coupling sleeve (33), the gas cavity (37) is communicated with the gas inlet channel (214), one end of the pressure regulating cavity (36) is connected with the crystal piezoelectric cavity (47) through the oil outlet hole (232) and the sealing valve (44), and the other end of the pressure regulating cavity is communicated with the second oil channel (212) through the first oil inlet hole (231).
2. The dual fuel injector of claim 1, wherein the oil feed assembly (1) further comprises:
and a joint tightening cap (12) which is provided outside the first intermediate body (15) and abuts against the joint (11) for tightening the joint (11) and the first intermediate body (15) so that the joint (11) and the first intermediate body (15) form a seal pair at the abutment to prevent fuel in the first oil passage (211) and the second oil passage (212) from mixing into each other at the abutment.
3. The dual fuel injector as claimed in claim 2, characterized in that a retaining ring (13) and an O-ring (14) for sealing off the fuel are arranged on the connection piece (11), the retaining ring (13) being intended to prevent the O-ring (14) from being pushed into the gap between the connection piece (11) and the first intermediate body (15) under the influence of the fuel.
4. The dual fuel injector of claim 1, characterized in that the piezoelectric actuator (4) further comprises an upper seat (42), the upper seat (42) being located at the top end of the piezoelectric crystal (41) and cooperating with a conical surface of the piezoelectric crystal cavity (47), the piezoelectric crystal (41) being arranged in a square recess between the upper seat (42) and the lower seat (43) to avoid radial play of the piezoelectric crystal (41).
5. The dual fuel injector of claim 1, characterized in that a disc spring (45) is provided at a bottom end of the lower seat (43) and the disc spring (45) is located at a top end of the transition piece (22), the disc spring (45) being adapted to provide a resilient force to disengage the lower seat (43) and the sealing valve (44) from each other.
6. The dual fuel injector of claim 1, characterized in that a first spring (46) is disposed within the sealing valve (44), the first spring (46) being configured to provide a pre-load force to cause a spherical head surface of the sealing valve (44) to abut a conical surface of the transition piece (22) to form a seal pair.
7. The dual fuel injector as claimed in claim 1, characterized in that the inner cylindrical surface of the coupling sleeve (33) is a coupling with the needle valve body (31), the outer cylindrical surface of the coupling sleeve (33) is a coupling with the nozzle sleeve (32), and the bottom end surface of the coupling sleeve (33) forms a sealing pair with the nozzle sleeve (32) to seal the gas injection hole (321).
8. The dual fuel injector of claim 1, characterized in that a conical sealing pair is formed between an end of the elongated needle valve (58) adjacent to the injection orifice (311) and the needle valve body (31) to seal the injection orifice (311).
9. The dual fuel injector of claim 1, characterized in that a second spring (34) is disposed within the pressure regulating chamber (36), the second spring (34) for regulating the pressure within the pressure regulating chamber (36).
10. An internal combustion engine comprising a dual fuel injector according to any of claims 1-9, the internal combustion engine further comprising a combustion chamber, the oil injection holes (311) and the gas injection holes (321) both communicating with the combustion chamber.
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|---|---|---|---|---|
| WO2022248916A1 (en) * | 2021-05-26 | 2022-12-01 | ESPINOSA LOAIZA, Juan Carlos | Device for mixing fuels with dual injectors in combustion engines |
| CN115355120A (en) * | 2022-09-06 | 2022-11-18 | 一汽解放汽车有限公司 | Dual-fuel injector, engine and vehicle |
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| Publication number | Publication date |
|---|---|
| CN112065593B (en) | 2022-06-10 |
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