CN114483397A - Dual-fuel injection device and dual-fuel engine - Google Patents
Dual-fuel injection device and dual-fuel engine Download PDFInfo
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- CN114483397A CN114483397A CN202111631000.8A CN202111631000A CN114483397A CN 114483397 A CN114483397 A CN 114483397A CN 202111631000 A CN202111631000 A CN 202111631000A CN 114483397 A CN114483397 A CN 114483397A
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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
- F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
- F02M43/04—Injectors peculiar thereto
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/042—The valves being provided with fuel passages
- F02M61/045—The valves being provided with fuel discharge orifices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
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- 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
- F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
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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
Abstract
The invention relates to the technical field of engines, in particular to a dual-fuel injection device and a dual-fuel engine. The dual fuel injection device comprises a shell, a fuel gas injection valve and a fuel oil injection valve; the shell comprises a nozzle part, the nozzle part is provided with a gas inlet, a fuel inlet and a main nozzle, the fuel inlet is communicated with the main nozzle, and the gas inlet is communicated with the main nozzle; the fuel gas injection valve and the fuel oil injection valve are fixed on the shell in parallel, an oil outlet of the fuel oil injection valve is communicated with the fuel oil inlet, and an air outlet of the fuel gas injection valve is communicated with the fuel gas inlet. The dual-fuel injection device integrates the fuel gas injection valve and the fuel oil injection valve on the shell, realizes the functions of injecting fuel gas and fuel oil through the same nozzle part, and has the advantages of simple structure and low processing difficulty.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a dual-fuel injection device and a dual-fuel engine.
Background
The conventional dual-fuel engine adopts an HPDI (high pressure direct injection) technology, which is helpful for improving the fuel substitution rate of the dual-fuel engine, wherein the fuel substitution rate can reach 95%, and the dual-fuel engine has better dynamic property, economy and emission.
In order to realize direct injection in the dual-fuel cylinder, the fuel injector has the functions of injecting fuel and injecting fuel gas at the same time. In the prior art, a fuel gas injection valve is sleeved outside a fuel injector to achieve the effect of simultaneously injecting fuel oil and fuel gas in a cylinder, but the sleeved structure increases the processing and assembling difficulty.
Disclosure of Invention
The invention discloses a dual-fuel injection device and a dual-fuel engine, which can realize the functions of fuel gas injection and fuel oil injection through the same nozzle part.
In order to achieve the purpose, the invention provides the following technical scheme:
a dual fuel injection apparatus comprising: a housing, a gas injection valve and a fuel injection valve;
the shell comprises a nozzle part, the nozzle part is provided with a gas inlet, a fuel inlet and a main nozzle, the fuel inlet is communicated with the main nozzle, and the gas inlet is communicated with the main nozzle;
the fuel gas injection valve and the fuel oil injection valve are fixed on the shell in parallel, an oil outlet of the fuel oil injection valve is communicated with the fuel oil inlet, and an air outlet of the fuel gas injection valve is communicated with the fuel gas inlet.
Above-mentioned dual fuel injection apparatus integrates gas injection valve and fuel injection valve on the shell to realize spouting the function of gas and spouting fuel through same spout portion, have simple structure, the advantage that the processing degree of difficulty is low.
Optionally, the nozzle part is formed with a first channel and a second channel;
one end of the first channel is connected with the fuel gas inlet, and the other end of the first channel is connected with the main nozzle;
one end of the second channel is connected with the fuel inlet, and the other end of the second channel is connected with the first channel.
Optionally, the first passage extends in a direction in which the gas is ejected from the gas outlet.
Optionally, at the junction of the first channel and the second channel, the included angle between the second channel and the first channel is an acute angle.
Optionally, the main nozzle comprises at least one sub-nozzle communicated with the first channel, and an included angle between the injection direction of each sub-nozzle and the extension direction of the first channel is an acute angle.
Optionally, the number of the sub-nozzles is at least two, and at least two of the sub-nozzles are circumferentially arrayed with respect to the extending direction of the first channel.
Optionally, the gas injection valve comprises a gas valve body, a gas valve solenoid valve and a gas valve needle;
the air valve body is fixed on the shell and is provided with an air valve low-pressure oil cavity, an air valve high-pressure oil cavity, an air valve pressure accumulation cavity, an air valve needle valve cavity and an air storage cavity; the air valve low-pressure oil cavity is communicated with the air valve high-pressure oil cavity through an air valve oil pressure channel, and the air valve high-pressure oil cavity is provided with an air valve high-pressure oil inlet; the gas valve pressure accumulation cavity is communicated with the gas storage cavity, the gas valve pressure accumulation cavity is provided with a gas inlet, and the gas storage cavity is communicated with the gas outlet;
the air valve needle can be movably arranged in the air valve needle cavity along a first direction, the first end of the air valve needle is positioned in the air valve high-pressure oil cavity, and the second end of the air valve needle is positioned in the air valve air storage cavity and matched with the air outlet;
the air valve electromagnetic valve is arranged in the air valve low-pressure oil cavity and used for controlling the conduction and the sealing of the air valve oil pressure channel.
Optionally, the fuel injection valve comprises an oil valve body, an oil valve solenoid valve and an oil valve needle;
the oil valve body is fixed on the shell and is provided with an oil valve low-pressure oil cavity, an oil valve high-pressure oil cavity, an oil valve pressure accumulation cavity, an oil valve needle valve cavity and an oil storage cavity; the oil valve low-pressure oil cavity is communicated with the oil valve high-pressure oil cavity through an oil valve oil pressure channel, and the oil valve high-pressure oil cavity is provided with an oil valve high-pressure oil inlet; the oil valve pressure accumulation cavity is communicated with the oil storage cavity, the oil valve pressure accumulation cavity is communicated with the oil valve high-pressure oil inlet, and the oil storage cavity is communicated with the oil outlet;
the oil valve needle can be movably arranged in the oil valve needle cavity along a first direction, the first end of the oil valve body is positioned in the oil valve high-pressure oil cavity, and the second end of the oil valve body is positioned in the oil valve oil storage cavity and matched with the oil outlet;
the oil valve electromagnetic valve is arranged in the oil valve low-pressure oil cavity and used for controlling the conduction and the sealing of the oil valve oil pressure channel.
Optionally, a fuel sealing ring is arranged between the fuel injection valve and the nozzle portion, and a fuel sealing ring is arranged between the fuel injection valve and the nozzle portion.
A dual fuel engine comprising a cylinder and the dual fuel injection apparatus of any one of the above aspects;
the cylinder comprises a cylinder shell, and a combustion chamber is formed in the cylinder shell;
the dual-fuel injection device is arranged in a cylinder shell, a fuel gas injection valve is positioned in the center of the cylinder, and the nozzle part is connected to the combustion chamber.
The dual-fuel engine can inject fuel oil and fuel gas into a combustion chamber from the same nozzle part successively, so that the HPDI technology of the cylinder is realized, and the improvement of the fuel oil substitution rate of the engine is facilitated.
Drawings
Fig. 1 is a schematic structural diagram of a dual fuel injection apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a nozzle portion in a dual fuel injection device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a gas injection valve in a dual fuel injection device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a fuel injection valve in a dual fuel injection device according to an embodiment of the present invention.
Reference numerals: 11-a spout portion; 12-a cover plate; 121-a first oil inlet; 122-a second oil inlet; 21-valve needle valve; 211-middle section of valve needle valve; 212-valve needle first section; 213-a second section of valve needle valve; 22-a gas valve body; 221-gas valve high pressure oil inlet; 222-a gas inlet; 23-air valve electromagnetic valve; 231-a valve core; 232-gas valve coil; 233-return spring of electromagnetic valve of air valve; 24-valve needle valve return spring; 25-a gas valve baffle; 251-fixing rings on the air valve partition plate; 252-a lower fixing ring of a gas valve clapboard; 31-oil valve needle valve; 311-middle section of oil valve needle valve; 312-oil valve needle first section; 313-the second section of the oil valve needle valve; 32-oil valve body; 321-an oil valve high pressure oil inlet; 33-oil valve solenoid valve; 331-oil valve core; 332-oil valve coil; 333-return spring of oil valve electromagnetic valve; 34-an oil valve needle valve return spring; 35-oil valve partition; 351-an oil valve partition plate upper fixing ring; 352-oil valve partition plate lower fixing ring; 41-gas sealing ring; 42-fuel seal ring.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
As shown in fig. 1, an embodiment of the present invention provides a dual fuel injection apparatus including a housing, a gas injection valve, and a fuel injection valve; the housing comprises a nozzle part 11, the specific structure of the nozzle part 11 can be shown in fig. 2, the nozzle part 11 is provided with a gas inlet a, a fuel inlet b and a main nozzle c, the gas inlet a is communicated with the main nozzle c, and the fuel inlet b is also communicated with the main nozzle c; the fuel gas injection valve and the fuel oil injection valve are fixed on the shell, an oil outlet of the fuel oil injection valve is communicated with the fuel oil inlet a, and an air outlet of the fuel gas injection valve is communicated with the fuel gas inlet b.
The housing may be fixed to the engine and the gas injection valve and the fuel injection valve are integrated into the housing in a side-by-side manner to achieve dual injection of gas and fuel. Specifically, the gas injection valve and the fuel injection valve share the same nozzle portion 11. The fuel oil sprayed from the oil outlet of the fuel oil injection valve can enter the nozzle part 11 through the fuel oil inlet b and is finally sprayed from the main nozzle c.
The axial direction of the fuel gas injection valve and the length direction of the fuel oil injection valve are both perpendicular to the parallel direction of the fuel gas injection valve and the fuel oil injection valve, so that the fuel gas injection valve and the fuel oil injection valve have compact structures, and the fuel gas injection valve is also beneficial to communication between a cylinder of an engine and the fuel gas injection valve.
It can be seen that the dual-fuel injection device provided by the embodiment of the application integrates the fuel gas injection valve and the fuel oil injection valve on the shell, realizes the functions of fuel gas injection and fuel oil injection through the same nozzle part 11, and has the advantages of simple structure and low processing difficulty.
Specifically, the spout portion 11 is formed with a first passage H1 and a second passage H2; one end of the first channel H1 is connected with the fuel gas inlet a, and the other end of the first channel H1 is connected with the main nozzle c; one end of the second passage H2 is connected to the fuel inlet b, and the other end of the second passage H2 is connected to the first passage H1. The extending direction of the first passage H1 is set to a first direction that is parallel to the longitudinal direction of the gas injection valve and the longitudinal direction of the fuel injection valve.
The extending direction of the first channel H1 is the fuel gas spraying direction of the fuel gas spraying valve, and fuel gas sprayed from the gas outlet of the fuel gas spraying valve enters the first channel H1 from the fuel gas inlet a and can directly pass through the first channel H1 and then is sprayed out from the main nozzle c; the extending direction of the second channel H2 forms an included angle with the direction of the fuel injection valve, the pressure of the fuel sprayed from the oil outlet of the fuel injection valve is high, when the fuel enters the second channel H2 from the fuel inlet b, the moving direction of the fuel changes once, a part of pressure is lost, the fuel is sprayed onto the inner wall of the first channel H1 through the second channel H2, a part of pressure is lost, then the fuel reaches the main nozzle c through a part of the first channel H1, the pressure of the fuel at the moment is low, and the main nozzle c cannot be corroded. That is, the fuel injection path is provided to prevent the fuel from being directly injected to the main nozzle hole c to cause erosion, and to improve the service life of the nozzle portion 11.
At the junction of the first channel H1 and the second channel H2, the angle between the second channel H2 and the first channel H1 is acute. Such angle setting can ensure that the fuel is injected to the inner wall of the first passage H1, attenuating the pressure of the fuel.
Wherein the main nozzle c comprises at least one sub-nozzle c' communicating with the first passage H1, and an angle between an injection direction of each sub-nozzle and an extending direction of the first passage H1 is an acute angle. Generally, the angle between the injection direction of each sub-nozzle and the extending direction of the first passage H1 is 60 °.
Specifically, the number of the sub-jets c 'is at least two, and the at least two sub-jets c' are circumferentially arrayed with respect to the extending direction of the first passage H1. The circumferential direction here refers to the circumferential direction of the gas injection valve.
The nozzle part 11 is formed with a first passage H1 communicating the fuel gas inlet b and the main nozzle c, and a second passage H2 communicating the fuel oil inlet a and the first passage H1;
in order to improve the sealing effect, a fuel sealing ring 42 is arranged between the fuel injection valve and the nozzle part 11, and a fuel sealing ring 41 is arranged between the fuel injection valve and the nozzle part 11, so that the fuel tightness and the fuel tightness of the device are ensured.
The shell also comprises a cover plate 12, the head end of the gas injection valve and the head end of the fuel injection valve are fixed on the cover plate 12, and the tail end of the gas injection valve and the tail end of the fuel injection valve are fixed on the nozzle part 11, so that the gas injection valve and the fuel injection valve can be arranged side by side.
Specifically, referring to fig. 3, the gas injection valve includes a valve body 22, a valve solenoid valve 23, and a valve needle 21; the air valve body 22 is fixed on the shell, an air valve low-pressure oil cavity A1, an air valve high-pressure oil cavity A2, an air valve pressure accumulation cavity A3, an air valve needle valve cavity R1 and an air storage cavity A4 are formed in the air valve body 22, the air valve low-pressure oil cavity A1 and the air valve high-pressure oil cavity A2 are communicated through an air valve first oil pressure channel P1, and the air valve high-pressure oil cavity A2 is provided with an air valve high-pressure oil inlet 221; the air valve pressure storage cavity A3 is communicated with the air storage cavity A4, the air valve pressure storage cavity A3 is provided with a fuel gas inlet 222, and the air storage cavity A4 is communicated with an air outlet Q1; the valve needle 21 is movably arranged in the valve cavity R1 along a first direction (i.e. the length direction of the valve needle 21, the vertical direction in fig. 1), a first end (the end facing the cover plate 12) of the valve needle 21 is located in the valve high-pressure oil chamber a2, a second end (the end facing the nozzle part 11) of the valve needle 21 is located in the air storage chamber a4, and the second end of the valve needle 21 is matched with the air outlet Q1; the air valve electromagnetic valve 23 is arranged in the air valve low-pressure oil cavity A1 and is used for controlling the conduction and the closure of the first oil pressure channel P1 of the air valve. The air valve low-pressure oil cavity A1 is communicated with the air valve needle valve cavity R1 through an air valve second oil pressure channel P2.
The first end of the air valve body 22 is connected with the cover plate 12 in a matching way, and the cover plate 12 is provided with a first oil inlet 121 for low-pressure oil to enter the air valve low-pressure oil cavity A1. The second end (i.e. the end of the air outlet Q1) of the air valve body 22 is connected with the nozzle part 11 in a matching way. The valve needle 21 is disposed in the valve cavity R1, and the valve needle 21 specifically includes a valve needle middle section 211, and a valve needle first section 212 and a valve needle second section 213 disposed at two ends of the valve needle middle section 211. The valve high-pressure oil chamber A2 is positioned on the side of the valve needle first section 212 far away from the valve needle middle section 211, and the valve pressure accumulation chamber A3 is positioned on the side of the step surface formed by the valve needle middle section 211 and the valve needle second section 213 facing the valve needle second section 213. An air storage cavity A4 is formed between the air valve pressure storage cavity A3 and the air outlet Q1.
Referring to fig. 1 and 3 together, the gas injection valve further includes a valve needle return spring 24, the valve needle return spring 24 surrounds the first section 212 of the valve needle, one end of the valve needle return spring 24 abuts against the inner wall of the valve chamber R1 of the valve needle, and the other end abuts against a step surface formed by the middle section 211 of the valve needle and the first section 212 of the valve needle.
The gas injection valve further comprises a gas valve partition plate 25 arranged in the gas valve low-pressure oil cavity A1, a gas valve partition plate upper fixing ring 251 and a gas valve partition plate lower fixing ring 252, the gas valve partition plate upper fixing ring 251 is arranged on one side, facing the cover plate 12, of the gas valve partition plate 25, the gas valve partition plate lower fixing ring 252 is arranged on one side, facing the gas valve needle 21, of the gas valve partition plate 25, and the gas valve partition plate 25 is fixed in the gas valve low-pressure oil cavity A1 of the gas valve body 22 through the gas valve partition plate upper fixing ring 251 and the gas valve partition plate lower fixing ring 252.
The air valve electromagnetic valve 23 comprises an air valve iron core 231, an air valve coil 232 and an air valve electromagnetic valve return spring 233, the air valve electromagnetic valve return spring 233 is sleeved on the periphery of the air valve iron core 231, one end of the air valve electromagnetic valve return spring 233 abuts against the cover plate 12, and the other end of the air valve electromagnetic valve return spring 233 is connected with the air valve iron core 231. The air valve iron core 231 is arranged in a central hole channel on the air valve partition plate 25 and can move up and down along a first direction, one end of the air valve iron core 231, which is far away from the cover plate 12, is matched with an air valve oil pressure channel P1, and the air valve coil 232 is sleeved on the periphery of an air valve electromagnetic valve return spring 233 and fixed at the top of an air valve low-pressure oil cavity A1; the air valve iron core 231, the air valve coil 232 and the air valve electromagnetic valve return spring 233 are coaxially arranged; when the valve coil 232 is electrified, the valve coil 232 and the valve core 231 are electromagnetically induced, and the valve core 231 can be driven to move up and down along the vertical direction. In fig. 1, the valve core 231 abuts against the valve oil pressure passage P1 to block the valve oil pressure passage P1; when the valve core 231 moves upward and away from the valve oil pressure passage P1, the valve oil pressure passage P1 is opened.
Correspondingly, referring to fig. 4, the fuel injection valve includes an oil valve body 32, an oil valve solenoid valve 33, and an oil valve needle 31; the oil valve body 32 is fixed on the shell, the oil valve body 32 is provided with an oil valve low-pressure oil chamber B1, an oil valve high-pressure oil chamber B2, an oil valve pressure accumulation chamber B3, an oil valve needle valve chamber R2 and an oil storage chamber B4, the oil valve low-pressure oil chamber and the oil valve high-pressure oil chamber B2 are communicated through an oil valve first oil pressure channel S1, and the oil valve high-pressure oil chamber B2 is provided with an oil valve high-pressure oil inlet 321; the oil valve pressure accumulation cavity B3 is communicated with the oil storage cavity B4, the oil valve pressure accumulation cavity B3 is communicated with the oil valve high-pressure oil inlet 321, and the oil storage cavity B4 is communicated with the oil outlet Q2; the oil valve needle 31 is movably arranged in the oil valve needle chamber R2 in a first direction (the length direction of the oil valve needle 31, the vertical direction in fig. 1), a first end (the end facing the cover plate 12) of the oil valve needle 31 is located in the oil valve high-pressure oil chamber B2, a second end (the end facing the nozzle portion 11) of the oil valve needle 31 is located in the oil storage chamber B4, and the second end of the oil valve needle 31 is matched with the oil outlet Q2; the oil valve solenoid valve 33 is disposed in the oil valve low-pressure oil chamber B1, and is used for controlling the opening and closing of the oil valve first oil pressure passage S2. The oil valve low-pressure oil chamber B1 is communicated with the oil valve needle valve chamber R2 through an oil valve second oil pressure channel S2.
The first end of the oil valve body 32 is connected with the cover plate 12 in a matching way, and the cover plate 12 is provided with a second oil inlet 122 for low-pressure oil to enter the oil valve low-pressure oil cavity B1. The second end of the oil valve body 32 (i.e., the end of the oil outlet port Q2) is connected with the nozzle part 11 in a matching manner. The oil valve needle 31 is disposed in the oil valve needle chamber R2, and the oil valve needle 31 specifically includes a fuel needle middle section 311, and a fuel needle first section 312 and a fuel needle second section 313 located at two ends of the fuel needle middle section 311. The fuel valve high-pressure oil chamber B2 is located on the side of the fuel needle first section 312 away from the fuel needle middle section 311, and the fuel valve pressure accumulation chamber B3 is located on the side of the fuel needle middle section 311 that forms a step surface with the fuel needle second section 313 facing the fuel needle second section 313. The oil valve high-pressure oil cavity B2 and the oil valve pressure accumulation cavity B3 are simultaneously communicated with the oil valve high-pressure oil inlet 321, and fuel oil high-pressure oil can be input into the oil valve high-pressure oil cavity B2 and the oil valve pressure accumulation cavity B3 from the oil valve high-pressure oil inlet 321; an oil reservoir chamber B4 is formed between the oil valve pressure accumulation chamber B3 and the oil outlet port Q2.
Referring to fig. 4 in addition to fig. 1, the fuel injection valve further includes a fuel needle return spring 34, the fuel needle return spring 34 surrounding the outer periphery of the first fuel needle section 312, one end of the fuel needle return spring 34 abutting against the inner wall of the fuel needle chamber R2, and the other end abutting against a step surface formed by the middle fuel needle section 311 and the first fuel needle section 312.
The fuel injection valve further includes a fuel partition plate 35 disposed in the fuel valve low-pressure oil chamber B1, and a fuel partition plate upper fixing ring 351 and a fuel partition plate lower fixing ring 352, the fuel partition plate upper fixing ring 351 being disposed on a side of the fuel partition plate 35 facing the cover plate 12, the fuel partition plate lower fixing ring 352 being disposed on a side of the fuel partition plate 35 facing the fuel valve needle 31, the fuel partition plate upper fixing ring 351 and the fuel partition plate lower fixing ring 352 fixing the fuel partition plate 35 in the fuel valve low-pressure oil chamber B1 of the fuel valve body 32.
The oil valve electromagnetic valve 33 comprises an oil valve iron core 331, a fuel coil 332 and an oil valve electromagnetic valve return spring 333, the oil valve electromagnetic valve return spring 333 is sleeved on the periphery of the oil valve iron core 331, one end of the oil valve electromagnetic valve return spring 333 is abutted against the cover plate 12, and the other end of the oil valve electromagnetic valve return spring 333 is connected with the oil valve iron core 331. The oil valve iron core 331 is arranged in a central hole channel on the oil valve partition plate 35 and can move up and down along a first direction, one end, far away from the cover plate 12, of the oil valve iron core 331 is matched with an oil valve oil pressure channel P2, and the oil valve coil 332 is sleeved on the periphery of an oil valve electromagnetic valve return spring 333 and fixed at the top of an oil valve low-pressure oil cavity B1; the oil valve iron core 331, the oil valve coil 332 and the oil valve electromagnetic valve return spring 333 are coaxially arranged; when the fuel coil 332 is electrified, the fuel coil 332 and the fuel iron core 331 generate electromagnetic induction, and the fuel iron core 331 can be driven to move up and down along the vertical direction. In fig. 1, the fuel iron core 331 abuts against the valve oil pressure passage P2 to close the valve oil pressure passage P2; when the fuel plunger 331 moves upward away from the valve oil pressure passage P2, the valve oil pressure passage P3 is opened.
When the dual-fuel injection device is applied to an engine, when the engine runs until a piston is close to a top dead center, an oil valve coil 332 is electrified, an oil valve iron core 331 rises under the action of electromagnetic force, an oil valve oil pressure channel P3 below the oil valve iron core 331 is conducted, and high-pressure fuel in an oil valve high-pressure oil cavity B2 above an oil valve needle valve 31 flows into an oil valve low-pressure oil cavity B1; the pressure above the oil valve needle valve 31 is reduced, the oil valve needle valve 31 overcomes the elastic force of the fuel needle valve return spring 34 to move upwards under the action of the pressure of high-pressure fuel in the oil valve pressure accumulation cavity B3, the fuel in the air outlet Q2 and the fuel storage cavity B4 is sprayed out, enters the second channel H2 along the channel of the fuel inlet B of the nozzle part 11, is firstly sprayed onto the inner wall of the first channel H1, and then reaches the main nozzle c along the first channel H1 to be sprayed out. Wherein the high-pressure fuel sprayed from the oil valve is prevented from eroding the main nozzle c because the junction point of the second passage H2 and the first passage H1 is higher than the main nozzle c.
Subsequently, the oil valve coil 332 is de-energized, the oil valve core 331 descends, the oil valve high-pressure oil chamber B2 is closed, and as high-pressure fuel enters from the oil valve high-pressure oil inlet 321, the pressure in the oil valve high-pressure oil chamber B2 above the oil valve needle 31 rises, the oil valve needle 31 descends, and the oil valve closes.
After the oil valve is closed, the air valve coil 233 is electrified, the air valve core 231 rises under the action of electromagnetic force, the air valve high-pressure oil chamber A2 below the air valve core 231 is opened, high-pressure fuel oil in the air valve high-pressure oil chamber A2 above the air valve needle valve 21 flows into the air valve low-pressure oil chamber A1, the pressure above the air valve needle valve 21 is reduced, the air valve needle valve 21 overcomes the elastic force of the air valve needle valve reset spring 24 to move upwards under the action of the pressure of high-pressure fuel gas in the air valve pressure accumulation chamber A3, the air outlet Q1 is opened, the fuel gas in the air storage chamber B4 is sprayed out to enter a main nozzle c along a first channel H1 and finally sprayed into the cylinder through the main nozzle c, and the fuel oil remained at the main nozzle can be swept out in the air spraying process to assist combustion. After the injection is finished, the valve coil 232 is powered off, the valve core 231 descends, the valve high-pressure oil cavity A2 is closed, high-pressure fuel enters from the valve high-pressure oil inlet 221, the pressure in the valve high-pressure oil cavity A2 above the valve needle valve 21 rises, the valve needle valve 21 descends, and the valve is closed.
Based on the dual-fuel injection device, the embodiment of the invention also provides a dual-fuel engine, which comprises a cylinder and the dual-fuel injection device provided by the embodiment; the cylinder comprises a cylinder shell, and a combustion chamber is formed in the cylinder shell; the dual fuel injection device is arranged in a cylinder shell, a fuel gas injection valve is positioned in the center of a cylinder, and a main nozzle c of a nozzle part 11 is connected into a combustion chamber.
When the dual-fuel engine works, fuel oil and fuel gas can be sprayed into a combustion chamber from the same nozzle part 11 in sequence, the HPDI technology of the cylinder is realized, and the fuel oil substitution rate of the engine is improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A dual fuel injection apparatus, comprising: a housing, a gas injection valve and a fuel injection valve;
the shell comprises a nozzle part, the nozzle part is provided with a gas inlet, a fuel inlet and a main nozzle, the fuel inlet is communicated with the main nozzle, and the gas inlet is communicated with the main nozzle;
the fuel gas injection valve and the fuel oil injection valve are fixed on the shell in parallel, an oil outlet of the fuel oil injection valve is communicated with the fuel oil inlet, and an air outlet of the fuel gas injection valve is communicated with the fuel gas inlet.
2. The dual fuel injection apparatus of claim 1, wherein the nozzle portion is formed with a first passage and a second passage;
one end of the first channel is connected with the fuel gas inlet, and the other end of the first channel is connected with the main nozzle;
one end of the second channel is connected with the fuel inlet, and the other end of the second channel is connected with the first channel.
3. The dual fuel injection apparatus of claim 2 wherein the first passage extends in the direction of the gas outlet port from which the fuel gas is ejected.
4. The dual fuel injection apparatus of claim 3 wherein the angle between the second passage and the first passage at the junction of the first passage and the second passage is an acute angle.
5. The dual fuel injection assembly of claim 2 wherein the main jet includes at least one sub-jet communicating with the first passage, the injection direction of each sub-jet being at an acute angle to the extension direction of the first passage.
6. The dual fuel injection apparatus of claim 5 wherein the number of sub-nozzle orifices is at least two, at least two of the sub-nozzle orifices being circumferentially arrayed about the direction of extension of the first passage.
7. The dual fuel injection apparatus of claim 1 wherein the fuel gas injection valve comprises a gas valve body, a gas valve solenoid valve, and a gas valve needle;
the air valve body is fixed on the shell and is provided with an air valve low-pressure oil cavity, an air valve high-pressure oil cavity, an air valve pressure accumulation cavity, an air valve needle valve cavity and an air storage cavity; the air valve low-pressure oil cavity is communicated with the air valve high-pressure oil cavity through an air valve oil pressure channel, and the air valve high-pressure oil cavity is provided with an air valve high-pressure oil inlet; the gas valve pressure storage cavity is communicated with the gas storage cavity, the gas valve pressure storage cavity is provided with a gas inlet, and the gas storage cavity is communicated with the gas outlet;
the air valve needle can be movably arranged in the air valve needle cavity along a first direction, the first end of the air valve needle is positioned in the air valve high-pressure oil cavity, and the second end of the air valve needle is positioned in the air valve air storage cavity and matched with the air outlet;
the air valve electromagnetic valve is arranged in the air valve low-pressure oil cavity and used for controlling the conduction and the sealing of the air valve oil pressure channel.
8. The dual fuel injection apparatus of claim 1 wherein the fuel injection valve comprises an oil valve body, an oil valve solenoid valve, and an oil valve needle;
the oil valve body is fixed on the shell and is provided with an oil valve low-pressure oil cavity, an oil valve high-pressure oil cavity, an oil valve pressure accumulation cavity, an oil valve needle valve cavity and an oil storage cavity; the oil valve low-pressure oil cavity is communicated with the oil valve high-pressure oil cavity through an oil valve oil pressure channel, and the oil valve high-pressure oil cavity is provided with an oil valve high-pressure oil inlet; the oil valve pressure accumulation cavity is communicated with the oil storage cavity, the oil valve pressure accumulation cavity is communicated with the oil valve high-pressure oil inlet, and the oil storage cavity is communicated with the oil outlet;
the oil valve needle can be movably arranged in the oil valve needle cavity along a first direction, the first end of the oil valve body is positioned in the oil valve high-pressure oil cavity, and the second end of the oil valve body is positioned in the oil valve oil storage cavity and matched with the oil outlet;
the oil valve electromagnetic valve is arranged in the oil valve low-pressure oil cavity and used for controlling the conduction and the sealing of the oil valve oil pressure channel.
9. The dual fuel injection apparatus as claimed in any of the claims 1 to 8, characterized in that a fuel sealing ring is arranged between the fuel injection valve and the nozzle portion and a gas sealing ring is arranged between the gas injection valve and the nozzle portion.
10. A dual fuel engine comprising a cylinder and a dual fuel injection apparatus as claimed in any one of claims 1 to 9;
the cylinder comprises a cylinder shell, and a combustion chamber is formed in the cylinder shell;
the dual-fuel injection device is arranged in the cylinder shell, the fuel gas injection valve is positioned in the center of the cylinder, and the nozzle part is connected into the combustion chamber.
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| CN202111631000.8A CN114483397B (en) | 2021-12-29 | 2021-12-29 | Dual-fuel injection device and dual-fuel engine |
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| CN202111631000.8A CN114483397B (en) | 2021-12-29 | 2021-12-29 | Dual-fuel injection device and dual-fuel engine |
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