CN118008647A - Coaxial fuel injection nozzle, fuel injection system and engine - Google Patents
Coaxial fuel injection nozzle, fuel injection system and engine Download PDFInfo
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- CN118008647A CN118008647A CN202410261286.2A CN202410261286A CN118008647A CN 118008647 A CN118008647 A CN 118008647A CN 202410261286 A CN202410261286 A CN 202410261286A CN 118008647 A CN118008647 A CN 118008647A
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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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Abstract
The invention relates to a coaxial oil nozzle, an oil injection system and an engine, comprising a needle valve body, a methanol needle valve and a diesel needle valve, wherein an inner cavity is formed in the needle valve body; a first pressure cavity is formed between the top of the methanol needle valve and the inside of the needle valve body, a second pressure cavity is formed between the top of the diesel needle valve and the inside top surface of the methanol needle valve, and the first pressure cavity is communicated with the outside of the oil nozzle through a second diesel loop penetrating through the needle valve body. In the invention, the coaxial design of the double needle valve is adopted, so that the change required by the existing engine is reduced to the greatest extent. Meanwhile, high-pressure normal-pressure oil injection of two fuels can be realized, the injection quantity, the injection time and the injection angle can be accurately controlled, and the optimal atomization effect of the two fuels can be ensured by the maximum effect.
Description
Technical Field
The invention relates to the field of engine combustion, in particular to a coaxial oil nozzle, an oil injection system comprising the coaxial oil nozzle and an engine comprising the oil injection system.
Background
With advances in engine combustion science and technology, understanding and control of chemical reactions in combustion, particularly control of spontaneous combustion of fuel, is becoming increasingly important. In the traditional gasoline engine, the ignition technology of ignition by a uniformly mixed gas spark plug is adopted, so that the combustion heat release curve is completely controlled by the ignition time, and the control requirement on oil injection is not high. In the traditional diesel engine, the diffusion flame is adopted to ignite, so that the oil injection time can basically and completely control the final heat release curve. However, both conventional gasoline engines and diesel engines have disadvantages in terms of thermal efficiency and pollutant emissions, respectively. In order to avoid the disadvantages of gasoline engines and diesel engines in these respects, advanced engine combustion techniques have been proposed in recent years which employ a homogeneous (or relatively homogeneous) mixture compression combustion mode of a certain mode. The homogeneous mixed air pressure combustion technology adopts advanced oil injection with larger amplitude, and the fuel and the air are mixed in enough time, and then the pressure and the temperature in the cylinder reach the ignition point near the top dead center after the piston reaches the ignition point, so that the ignition is carried out.
In addition, reducing the dependence on petroleum and natural gas imports, future traffic energy sources, especially heavy trucks, ships, airplanes, will face unavoidable renewable energy source transformation. Among these, the challenge of fuel diversity is necessarily faced. However, in the existing alternative fuel options, such as methanol, ammonia, natural gas and hydrogen, none of the alternative fuels has the same ignition characteristics as gasoline or diesel, and the alternative fuels are difficult to directly use in the existing engine.
In the invention, methanol and diesel oil are taken as examples, and methanol is difficult to press and ignite directly on a diesel engine because the spontaneous ignition of the methanol is poorer than that of the diesel oil. Therefore, these alternative fuels are used in existing engines, and generally require the co-use of two fuels. For example, methanol is used in diesel engines, and a part of diesel oil needs to be injected to play a role in supporting combustion and ignition.
However, the existing related dual fuel injection system technology has limitations on the injection sequence and injection time of two fuels, and precise control is difficult to realize.
Disclosure of Invention
In view of this, the present invention aims to propose a coaxial fuel injector, a fuel injection system and an engine,
To solve the problems set forth in the background art.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
The invention provides a coaxial oil nozzle, which comprises a needle valve body, a methanol needle valve and a diesel needle valve, wherein an inner cavity is formed in the needle valve body;
A first pressure cavity is formed between the top of the methanol needle valve and the needle valve body, a second pressure cavity is formed between the top of the diesel needle valve and the inner top surface of the methanol needle valve, the first pressure cavity is communicated with the outside of the oil nozzle through a second diesel loop penetrating through the needle valve body, and the second pressure cavity is communicated with the outside of the oil nozzle through a first diesel loop penetrating through the methanol needle valve and the needle valve body;
The methanol pressure chamber is communicated with the outside of the needle valve body through a methanol oil way penetrating through the needle valve body, the diesel pressure chamber is arranged at the lower position inside the methanol needle valve and is communicated with the outside of the needle valve body through a diesel oil way penetrating through the methanol needle valve and the needle valve body;
the bottom of the needle valve body is provided with a methanol spray hole, the methanol pressure chamber is communicated with the engine combustion chamber through the methanol spray hole, the part of the bottom of the methanol needle valve, which extends out of the needle valve body, is provided with a diesel spray hole, and the diesel pressure chamber is communicated with the engine combustion chamber through the diesel spray hole.
Further, the outer side wall of the needle valve body is provided with a convex connecting part, a second diesel oil inlet and a methanol inlet which are communicated with the diesel oil way and the methanol oil way, and a first diesel oil inlet which is communicated with the first pressure cavity.
Furthermore, the bottom of the methanol pressure chamber is provided with an inclined plane, the bottom of the methanol needle valve is provided with an inclined plane matched with the bottom of the methanol pressure chamber, and a methanol sealing surface for preventing the methanol pressure chamber from being communicated with a methanol spray hole can be formed when the inclined plane of the methanol pressure chamber is abutted against the inclined plane of the methanol needle valve;
The bottom of the diesel oil pressure chamber is provided with an inclined plane, the side wall of the diesel oil needle valve is provided with an inclined plane matched with the bottom of the diesel oil pressure chamber, and when the inclined plane of the diesel oil pressure chamber is abutted against the inclined plane of the diesel oil needle valve, a diesel oil sealing surface for preventing the diesel oil pressure chamber from being communicated with the diesel oil spray hole can be formed.
Further, a first electromagnetic valve and a second electromagnetic valve are respectively arranged on the first diesel oil loop and the second diesel oil loop.
Further, when the methanol needle valve slides in the needle valve body, the outer side wall of the methanol needle valve is tightly attached to the inner side wall of the needle valve body;
When the diesel needle valve slides in the methanol needle valve, the outer side wall of the diesel needle valve is tightly attached to the inner side wall of the methanol needle valve.
Further, a storage cavity is arranged at the inner bottom of the methanol needle valve and is communicated with the diesel pressure chamber, and the storage cavity is communicated with the diesel spray hole.
Further, at least two diesel spray holes and at least two methanol spray holes are respectively arranged.
An oil injection system is provided with the coaxial oil nozzle;
The fuel injection system comprises a methanol common rail system and a diesel common rail system, wherein the methanol common rail system comprises a methanol oil pump, a methanol filter, a methanol oil tank, a methanol pressure control valve and a methanol guide pipe which are sequentially communicated, and the diesel common rail system comprises a diesel guide pipe, a diesel filter, a diesel oil tank, a diesel pressure control valve and a diesel guide pipe which are sequentially communicated;
The methanol conduit is communicated with the methanol inlet, and the diesel conduit is communicated with the first diesel inlet, the second diesel inlet, the first diesel loop and the second diesel loop;
the methanol pressure control valve and the diesel pressure control valve are connected with the control unit.
An engine is provided with the fuel injection system.
Compared with the prior art, the invention has the following advantages:
In the present invention, two different liquid fuels are separately and independently controlled to be injected into the combustion chamber of an internal combustion engine. In addition, the oil nozzle adopts the coaxial design of the double needle valve, thereby reducing the modification required by the existing engine to the greatest extent. Meanwhile, high-pressure normal-pressure oil injection of two fuels can be realized, the injection quantity, the injection time and the injection angle can be accurately controlled, and the optimal atomization effect of the two fuels can be ensured by the maximum effect.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic view of a fuel injector according to the present invention;
FIG. 2 is a schematic diagram of an injection system according to the present invention.
Reference numerals illustrate:
1. A needle valve body; 101. methanol spray holes; 102. a first pressure chamber; 2. a methanol needle valve; 201. diesel oil jet orifice; 202. a second pressure chamber; 3. a diesel needle valve; 4. a first diesel inlet; 401. a second diesel inlet; 4011. a diesel oil path; 4012. a diesel pressure chamber; 5. a methanol inlet; 501. a methanol oil path; 502. a methanol pressure chamber; 6. a first diesel circuit; 601. a second diesel circuit; 7. a first electromagnetic valve; 701. a second electromagnetic valve; 8. sealing surfaces of methanol; 9. diesel sealing surface; 10. a storage chamber; 11. a methanol oil pump; 1101. a methanol filter; 1102. a methanol oil tank; 1103. a methanol pressure control valve; 1104. a methanol conduit; 12. a diesel oil pump; 1201. a diesel filter; 1202. a diesel oil tank; 1203. a diesel pressure control valve; 1204. a diesel conduit; 13. and a control unit.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the present invention, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", "inner", "back", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, in the description of the present invention, the terms "mounted," "connected," and "connected," are to be construed broadly, unless otherwise specifically defined. For example, the connection can be fixed connection, detachable connection or integrated connection; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in combination with specific cases.
The invention will be described in detail below with reference to fig. 1 to 2 in conjunction with examples.
Example 1
The present invention relates generally to a coaxial fuel injector, as opposed to injecting fuel in advance during engine ignition. The diesel oil needle valve comprises a needle valve body 1 with an inner cavity formed inside, a methanol needle valve 2 with an inner cavity formed inside and a diesel oil needle valve 3 which is connected inside the methanol needle valve 2 in a sliding way, wherein the inner cavity is formed inside the needle valve body 1;
As shown in fig. 1, a first pressure cavity 102 is formed between the top of the methanol needle valve 2 and the inside of the needle valve body 1, a second pressure cavity 202 is formed between the top of the diesel needle valve 3 and the inside top surface of the methanol needle valve 2, the first pressure cavity 102 is communicated with the outside of the fuel injection nozzle through a second diesel loop 601 penetrating through the needle valve body 1, and the second pressure cavity 202 is communicated with the outside of the fuel injection nozzle through a first diesel loop 6 penetrating through the methanol needle valve 2 and the needle valve body 1;
A methanol pressure chamber 502 is arranged at the lower position inside the needle valve body 1, the methanol pressure chamber 502 is communicated with the outside of the needle valve body 1 through a methanol oil path 501 penetrating through the needle valve body 1, a diesel pressure chamber 4012 is arranged at the lower position inside the methanol needle valve 2, and the diesel pressure chamber 4012 is communicated with the outside of the needle valve body 1 through a diesel oil path 4011 penetrating through the methanol needle valve 2 and the needle valve body 1;
The bottom of the needle valve body 1 is provided with a methanol spray hole 101, the methanol pressure chamber 502 is communicated with the engine combustion chamber through the methanol spray hole 101, the part of the bottom of the methanol needle valve 2 extending to the outer side of the needle valve body 1 is provided with a diesel spray hole 201, and the diesel pressure chamber 4012 is communicated with the engine combustion chamber through the diesel spray hole 201.
In this embodiment, as shown in fig. 1, two different liquid fuels are separately and independently controlled to be injected into the combustion chamber of the internal combustion engine. In addition, the oil nozzle adopts the coaxial design of the double needle valve, thereby reducing the modification required by the existing engine to the greatest extent. Meanwhile, high-pressure normal-pressure oil injection of two fuels can be realized, the injection quantity, the injection time and the injection angle can be accurately controlled, and the optimal atomization effect of the two fuels can be ensured by the maximum effect.
Based on the above arrangement, as shown in fig. 1, methanol enters the methanol oil path 501 and the methanol pressure chamber 502 through the methanol inlet 5 to be stored, when the injection strategy does not need to inject methanol: because the bottom of the methanol pressure chamber 502 is provided with the inclined plane, the bottom of the methanol needle valve 2 is provided with the inclined plane matched with the bottom of the methanol pressure chamber 502, diesel oil enters the first pressure cavity 102 from the second diesel oil loop 601 and presses the methanol needle valve 2, the inclined plane of the methanol pressure chamber 502 is abutted with the inclined plane of the methanol needle valve 2, and therefore a methanol sealing surface 8 for preventing the methanol pressure chamber 502 from being communicated with the methanol spray hole 101 can be formed, and further injection of methanol is prevented. When the injection strategy is to inject methanol: diesel oil in the first pressure chamber 102 reversely flows out of the first pressure chamber, the methanol needle valve 2 can slide upwards to open the methanol sealing surface 8, and methanol is sprayed from the methanol pressure chamber 502 to the engine combustion chamber through the methanol spray hole 101 due to the pressure effect.
It should be noted that, as shown in fig. 1, based on the above arrangement, diesel is stored by entering the diesel circuit and the diesel pressure chamber 4012 through the second diesel inlet 401, and when the injection strategy does not need to inject diesel: because the bottom of the diesel pressure chamber 4012 is provided with the inclined plane, the side wall of the diesel needle valve 3 is provided with the inclined plane matched with the bottom of the diesel pressure chamber 4012, diesel can enter the second pressure chamber 202 from the first diesel loop 6, further the diesel needle valve 3 is pressed, the inclined plane of the diesel pressure chamber 4012 is driven to be abutted with the inclined plane of the diesel needle valve 3, and the diesel sealing surface 9 for preventing the diesel pressure chamber 4012 from being communicated with the diesel spray hole 201 is formed, so that the injection of diesel is prevented. When the injection strategy needs to inject diesel, diesel in the second pressure cavity 202 flows backward, so that the diesel needle valve 3 slides upwards, the diesel sealing surface 9 is opened, and diesel is injected into the engine combustion chamber through the diesel injection hole 201.
In the actual working process, when the methanol needle valve 2 slides in the needle valve body 1, the outer side wall of the methanol needle valve 2 is tightly attached to the inner side wall of the needle valve body 1; when the diesel needle valve 3 slides in the methanol needle valve 2, the outer side wall of the diesel needle valve 3 is tightly attached to the inner side wall of the methanol needle valve 2. Thus, the methanol and diesel oil can be prevented from leaking in the oil nozzle and mixing with each other, so that the starting ignition of the engine is affected.
In addition, as the diesel fuel injection hole 201 and the methanol injection hole 101 are preferably provided at least two, respectively, so that the injection brightness of methanol and diesel fuel can be ensured to meet the requirements of the engine combustion chamber, and the diesel fuel injection hole is particularly provided according to the actual situation, and is not further limited herein.
It should be noted that the outer side wall of the needle valve body 1 is provided with a convex connecting portion, a second diesel inlet 401 and a methanol inlet 5 which are communicated with the diesel oil path 4011 and the methanol oil path 501, and a first diesel inlet 4 which is communicated with the first pressure chamber 102.
In this embodiment, as shown in fig. 1, the connection portion can facilitate the external connection of the second diesel inlet 401 and the methanol inlet 5 to supplement diesel oil and methanol, and in addition, since the internal space of the first pressure chamber 102 is larger than that of the second pressure chamber 202, more diesel oil is required to be snapped into the methanol needle valve 2 by the first pressure chamber 102, and the diesel oil delivery pressure of the second diesel oil circuit 601 to the first pressure chamber 102 can be relieved by the first diesel oil inlet 4.
As a preferable mode of the present embodiment, the first solenoid valve 7 and the second solenoid valve 701 are respectively provided on the first diesel circuit 6 and the second diesel circuit 601, so that the transfer or reverse flow of diesel in the first diesel circuit 6 and the second diesel circuit 601 can be controlled more conveniently.
Since the diesel pressure chamber 4012 is in the methanol needle valve 2, the stored diesel is less than the methanol in the methanol pressure chamber 502, and in order to prevent the diesel injection from failing to meet the combustion demand, in this embodiment, a storage chamber 10 is disposed at the bottom of the methanol needle valve 2, the storage chamber 10 is also communicated with the diesel injection hole 201 while being communicated with the diesel pressure chamber 4012, and the storage chamber 10 increases the storage amount of diesel.
In summary, the present invention can realize independent injection of two fuels, and the existing related dual fuel injection system technology has limitation on the injection sequence and injection time of two fuels, while the dual fuel coaxial fuel injector of the present invention has no limitation on the injection sequence and injection time of two fuels. One fuel injection alone, two fuels simultaneously, two fuel alternate injections and any other dual fuel injection strategy can be realized. The flexible fuel injection strategy enables advanced combustion modes with fuel chemical reactivity as an important control means.
In addition, the dual fuels share a coaxial oil nozzle, so that the space for installing redundant oil nozzles required by the cylinder cover of the engine is reduced, and the complexity of the design of the cylinder cover of the engine is reduced.
It should be appreciated that if the ignition characteristics of the renewable fuel are poor, such as methanol, the renewable fuel may be used as a fuel in the dual fuel system of the present invention, using a combustion improver, such as diesel or another ignition improver. In contrast, if the ignition characteristics of the renewable fuel are too strong, another fuel with strong reactivity may be blended as an ignition inhibitor. If the volatility of the renewable fuel is poor, the size of the spray holes can be reduced, the pressure of the pressure chamber can be increased, and the atomization effect can be enhanced. If the volatility of the renewable fuel is good, the size of the spray hole can be increased, the pressure of the pressure chamber can be reduced, and the cost can be reduced.
The dual fuel of the present invention is applicable to any dual liquid fuel, and the present invention is described in terms of methanol and diesel as specific embodiments, but is not limited to methanol and diesel. And can also be methanol and biodiesel, methanol and fuel ignition additives, ethanol and diesel oil, etc.
Example two
On the basis of the above embodiments, this embodiment proposes a fuel injection system provided with the above coaxial fuel injector.
As shown in fig. 2, the fuel injection system comprises a methanol common rail system and a diesel common rail system, the methanol common rail system comprises a methanol oil pump 11, a methanol filter 1101, a methanol oil tank 1102, a methanol pressure control valve 1103 and a methanol conduit 1104 which are sequentially communicated, and the diesel common rail system comprises a diesel conduit 1204, a diesel filter 1201, a diesel oil tank 1202, a diesel pressure control valve 1203 and a diesel conduit 1204 which are sequentially communicated; the methanol conduit 1104 communicates with the methanol inlet 5, and the diesel conduit 1204 communicates with the first diesel inlet 4, the second diesel inlet 401, the first diesel circuit 6, and the second diesel circuit 601.
In this embodiment, methanol is pumped from the methanol tank 1102 to the methanol pipe 1104 by the operation of the methanol oil pump 11, and then is input into the methanol pressure chamber 502 through the methanol inlet 5, and can be pressurized while being transported. The methanol filter 1101 can filter impurities in methanol to prevent the engine from being started, and the methanol pressure control valve 1103 can control the pressure in the methanol common rail system to prevent accidents.
As shown in fig. 2, in the diesel common rail system, diesel is pumped into the diesel conduit 1204 from the diesel pump 12 through the operation of the diesel pump 12, then enters the first pressure chamber 102 through the second diesel inlet 401 and the second diesel circuit 601, enters the diesel pressure chamber 4012 through the second diesel inlet 401, enters the second pressure chamber 202 through the first diesel circuit 6, during operation, the diesel filter 1201 can filter impurities in the diesel, prevent the starting of the engine from being affected, and the diesel pressure control valve 1203 can control the pressure in the diesel common rail system and the on-off state of each pipeline, thereby preventing accidents.
Based on the above arrangement, the on-off valve is arranged at the communication position of the methanol conduit 1104 and the diesel conduit 1204 and the fuel spray nozzle and used for controlling the on-off of the communication pipeline, so that potential safety hazards can be reduced, and different working requirements can be met.
The methanol pressure control valve 1103 and the diesel pressure control valve 1203 are connected to a control unit 13, and the control unit 13 is an ECU, i.e., a vehicle-mounted computer, and is composed of a microcontroller and a peripheral circuit, and the injection strategy of the fuel is controlled by an ECU algorithm.
Example III
The present embodiment relates to an engine in which the fuel injection system according to the second embodiment is provided.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (9)
1. A coaxial oil jet, characterized in that:
The diesel oil injection valve comprises a needle valve body (1) with an inner cavity formed inside, a methanol needle valve (2) with the inner cavity formed inside and connected with the needle valve body (1) in a sliding way, and a diesel oil needle valve (3) connected with the methanol needle valve (2) in a sliding way;
A first pressure cavity (102) is formed between the top of the methanol needle valve (2) and the inside of the needle valve body (1), a second pressure cavity (202) is formed between the top of the diesel needle valve (3) and the inside top surface of the methanol needle valve (2), the first pressure cavity (102) is communicated with the outside of the fuel injection nozzle through a second diesel loop (601) penetrating through the needle valve body (1), and the second pressure cavity (202) is communicated with the outside of the fuel injection nozzle through a first diesel loop (6) penetrating through the methanol needle valve (2) and the needle valve body (1);
A methanol pressure chamber (502) is arranged at the lower position inside the needle valve body (1), the methanol pressure chamber (502) is communicated with the outside of the needle valve body (1) through a methanol oil path (501) penetrating through the needle valve body (1), a diesel pressure chamber (4012) is arranged at the lower position inside the methanol needle valve (2), and the diesel pressure chamber (4012) is communicated with the outside of the needle valve body (1) through a diesel oil path (4011) penetrating through the methanol needle valve (2) and the needle valve body (1);
The fuel injection valve is characterized in that a methanol spray hole (101) is formed in the bottom of the needle valve body (1), the methanol pressure chamber (502) is communicated with an engine combustion chamber through the methanol spray hole (101), a diesel spray hole (201) is formed in the portion, extending out of the outer side of the needle valve body (1), of the bottom of the methanol needle valve (2), and the diesel pressure chamber (4012) is communicated with the engine combustion chamber through the diesel spray hole (201).
2. A coaxial oil jet according to claim 1, wherein:
The outer side wall of the needle valve body (1) is provided with a convex connecting part, a second diesel inlet (401) and a methanol inlet (5) which are communicated with the diesel oil way (4011) and the methanol oil way (501) are arranged, and a first diesel inlet (4) which is communicated with the first pressure cavity (102) is also arranged.
3. A coaxial oil jet as claimed in claim 2, wherein:
The bottom of the methanol pressure chamber (502) is provided with an inclined plane, the bottom of the methanol needle valve (2) is provided with an inclined plane matched with the bottom of the methanol pressure chamber (502), and when the inclined plane of the methanol pressure chamber (502) is abutted against the inclined plane of the methanol needle valve (2), a methanol sealing surface (8) for preventing the methanol pressure chamber (502) from being communicated with the methanol spray hole (101) can be formed;
The bottom of the diesel oil pressure chamber (4012) is provided with an inclined plane, the side wall of the diesel oil needle valve (3) is provided with an inclined plane matched with the bottom of the diesel oil pressure chamber (4012), and when the inclined plane of the diesel oil pressure chamber (4012) is abutted to the inclined plane of the diesel oil needle valve (3), a diesel oil sealing surface (9) for preventing the diesel oil pressure chamber (4012) from being communicated with the diesel oil spray hole (201) can be formed.
4. A coaxial oil jet as claimed in claim 2, wherein:
The first diesel oil loop (6) and the second diesel oil loop (601) are respectively provided with a first electromagnetic valve (7) and a second electromagnetic valve (701).
5. A coaxial oil jet as claimed in claim 2, wherein:
when the methanol needle valve (2) slides in the needle valve body (1), the outer side wall of the methanol needle valve (2) is tightly attached to the inner side wall of the needle valve body (1);
when the diesel needle valve (3) slides in the methanol needle valve (2), the outer side wall of the diesel needle valve (3) is tightly attached to the inner side wall of the methanol needle valve (2).
6. A coaxial oil jet as claimed in claim 2, wherein:
The inner bottom of the methanol needle valve (2) is provided with a storage cavity (10), the storage cavity (10) is communicated with the diesel oil pressure chamber (4012), and the storage cavity (10) is communicated with the diesel oil spray hole (201).
7. A coaxial oil jet as claimed in claim 2, wherein:
At least two diesel spray holes (201) and at least two methanol spray holes (101) are respectively arranged.
8. A fuel injection system is characterized in that,
The fuel injection system is provided with the coaxial fuel injection nozzle as claimed in any one of claims 2 to 7;
The fuel injection system comprises a methanol common rail system and a diesel common rail system, wherein the methanol common rail system comprises a methanol oil pump (11), a methanol filter (1101), a methanol oil tank (1102), a methanol pressure control valve (1103) and a methanol conduit (1104) which are sequentially communicated, and the diesel common rail system comprises a diesel conduit (1204), a diesel filter (1201), a diesel oil tank (1202), a diesel pressure control valve (1203) and a diesel conduit (1204) which are sequentially communicated;
The methanol conduit (1104) is communicated with the methanol inlet (5), and the diesel conduit (1204) is communicated with the first diesel inlet (4), the second diesel inlet (401), the first diesel loop (6) and the second diesel loop (601);
the methanol pressure control valve (1103) and the diesel pressure control valve (1203) are connected with a control unit (13).
9. An engine, which is characterized in that,
An injection system according to claim 8 disposed within said engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202410261286.2A CN118008647A (en) | 2024-03-07 | 2024-03-07 | Coaxial fuel injection nozzle, fuel injection system and engine |
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| CN202410261286.2A CN118008647A (en) | 2024-03-07 | 2024-03-07 | Coaxial fuel injection nozzle, fuel injection system and engine |
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| US12486810B1 (en) * | 2024-06-04 | 2025-12-02 | Caterpillar Inc. | Dual fuel system and method feeding same fuel at two pressures to fuel injector |
| CN120211969A (en) * | 2025-05-28 | 2025-06-27 | 上海醇喜新能源科技有限公司 | Leak-proof dual-fuel coaxial injector with swirl atomization and micro-explosion structure |
| CN120211969B (en) * | 2025-05-28 | 2025-08-08 | 上海醇喜新能源科技有限公司 | Leak-proof dual-fuel coaxial injector with swirl atomization and micro-explosion structure |
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