CN222254183U - AADI (anaerobic-anoxic-oxic) injector for heavy oil and alcohol-based fuel engine - Google Patents
AADI (anaerobic-anoxic-oxic) injector for heavy oil and alcohol-based fuel engine Download PDFInfo
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- CN222254183U CN222254183U CN202421253024.3U CN202421253024U CN222254183U CN 222254183 U CN222254183 U CN 222254183U CN 202421253024 U CN202421253024 U CN 202421253024U CN 222254183 U CN222254183 U CN 222254183U
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Abstract
An AADI injector for heavy oil and alcohol-based fuel engine has an enlarged spherical end at the bottom of valve rod, which is matched with the conical or arc injection hole in size, and the gap between the enlarged spherical end and the conical injection hole forms an injection outlet. The utility model can realize the atomization of fuel under a specific low-pressure working condition, ensures the stable operation of an engine, provides stable and accurate flow measurement through the oil injection valve, ensures that the fuel is mixed with compressed air in the oil-gas mixing cavity, and ensures that the fuel reaches supersonic tearing into micron-sized fine liquid drop particles at the throat through the special Laval structure of the air injection valve so as to be directly ignited.
Description
Technical Field
The utility model relates to the technical field of internal combustion engines, in particular to an AADI injector for a heavy oil and alcohol-based fuel engine.
Background
The AADI injector assembly is a key component in an internal combustion engine, and the working principle of the AADI injector assembly is that fuel oil is precisely metered and injected into a mixing cavity with 300-1000 KPa air pressure through an oil injection valve, the fuel oil is mixed with compressed air in the mixing cavity and then injected into a cylinder in an atomized form through an air injection valve, and combustible mixed gas is formed after the fuel oil is mixed with air and is directly ignited in a combustion chamber. The existing diesel injector is used for ignition engine and is generally direct injection in a high-pressure cylinder.
However, the existing AADI injectors still have the disadvantages that 1, the pressure of a fuel rail is high, the energy consumption for establishing the pressure is high, which is not beneficial to the use of a small-discharge high-power-weight ratio engine, and 2, the fuel entering a cylinder is difficult to ignite for alcohol-based fuel with high heat value because the atomization effect is not good enough.
Disclosure of Invention
The AADI injector assembly provided by the utility model has the advantages that fuel atomization is realized under a specific low-pressure working condition (the pressure of a fuel rail is lower than 1 MPa), the stable operation of an engine is ensured, stable and accurate flow metering is provided through an oil injection valve, the fuel is mixed with compressed air in an oil-gas mixing cavity, and the fuel is enabled to reach supersonic tearing into micron-sized fine liquid drop particles at a throat through a special Laval structure of an air injection valve, so that the fuel can be directly ignited.
In order to achieve the above purpose, the technical scheme of the utility model is as follows:
An AADI injector for heavy oil and alcohol-based fuel engine is characterized in that an air injection valve mounting seat is arranged at the lower part of an oil injection valve, a mixing cavity is formed in the air injection valve mounting seat, an air injection valve is connected and arranged below the mixing cavity, a valve core is arranged at the upper part of a valve body of the air injection valve, the valve core is fixedly connected with the upper end of a valve rod, the lower end face of the valve core is connected with the upper end of a pressure spring, the lower end of the pressure spring is connected with the upper end of a magnetic conduction pipe, the magnetic conduction pipe is fixed with the valve body, an electromagnet is arranged at the outer side of the magnetic conduction pipe, the upper part of the valve rod is hollow, a pipe inlet is connected with the mixing cavity, a pipe outlet is formed at the side face of a necking part near the bottom, a cavity is formed between the necking part and the inner wall of an injection hole, the bottom of the valve rod is an expanded spherical end which is matched with the size of a conical or arc injection hole, and an injection outlet is formed between the expanded spherical end and the conical injection hole.
When the electromagnet is electrified, the magnetic conduction pipe magnetizes to generate suction force to the valve core above, the valve core overcomes the resistance of the pressure spring and moves downwards together with the valve rod, namely, a ball head at the lower end of the valve rod and the conical outlet generate a gap to form an outlet, and the opening of the air injection valve is realized.
The fluid flows in from the inner cavity of the hollow valve rod to the direction of the air outlet hole, enters the cavity through the air outlet hole, namely, the front section cavity of the Laval throat (the annular cavity inclined to the outlet end), the cross section of the annular cavity is the largest at the shrinking neck part of the ball head end, when the valve rod is pushed to be opened, a narrow injection outlet is formed between the ball head end spherical surface and the conical injection port, namely, the Laval throat is formed, the fluid flows through the throat at a high speed to form a first stage structure of the Laval pipe, then, the fluid reaches the conical injection port, the cross section is suddenly increased to form a second stage of the Laval pipe, and the energy in the fluid is severely released to form high-speed atomized airflow injection, so that atomized injection is completed.
The upper part of the oil injection valve is connected with an oil cap.
The oil-gas mixing seat is arranged below the mixing cavity, the lower end of the oil-gas mixing seat is connected with the air injection valve, and the diameter of a through hole at the lower end of the oil-gas mixing seat is smaller than the diameter of an inlet at the upper end. The oil-gas mixing seat increases the turbulent energy of the fluid by reducing the passing cross section of the fluid, so that the two high-speed fluids can be fully mixed in the cavity to achieve better atomization effect.
The working principle of the utility model is as follows:
The fuel oil enters the fuel injection valve from the upper part, the fuel oil is precisely metered and injected into the mixing cavity with the air pressure of 300-1000 KPa by the fuel injection valve, the fuel oil is mixed with the compressed air in the mixing cavity and then is injected into the cylinder in an atomized form by the fuel injection valve, and the fuel oil is mixed with the air to form combustible mixed gas to be directly ignited in the combustion chamber of the cylinder of the engine.
Advantages of the utility model
The utility model optimizes the structure of the injection end of the AADI injector by utilizing the valve rod structure similar to that in the prior patent, namely the compressible fluid high-speed injection metering valve (202320627968.1), can greatly improve the injection speed of the outlet of the metering valve, improve the flow velocity and flow rate of fluid and further improve the fuel atomization effect by utilizing the Laval pipe principle without establishing larger fuel rail pressure.
2. The AADI injector has good fuel atomization effect, can be used on a small-displacement high-power-to-weight ratio engine, and has good ignition effect on heavy oil with high heat value, alcohol-based fuel and the like.
Drawings
FIG. 1 is a schematic view of the internal structure of the present utility model;
the serial numbers and the part names in the figure are 1-oil cap, 2-oil injection valve, 3-air injection valve mounting seat, 4-oil gas mixing seat, 5-valve core, 6-pressure spring, 7-electromagnet, 8-magnetic conduction pipe, 9-valve rod and 10-mixing cavity.
Detailed Description
Example 1
An AADI injector for a heavy oil and alcohol-based fuel engine is characterized in that an air injection valve mounting seat 3 is arranged at the lower part of an oil injection valve 2, a mixing cavity 10 is arranged in the air injection valve mounting seat 3, an air injection valve is connected and arranged below the mixing cavity 10, a valve core 5 is arranged at the upper part of a valve body of the air injection valve, the valve core 5 is fixedly connected with the upper part of a valve rod 9, the lower end face of the valve core 5 is connected with the upper end of a pressure spring 6, the lower end of the pressure spring 6 is connected with the upper end of a magnetic conduction pipe 8, the magnetic conduction pipe 8 is fixed with the valve body, an electromagnet 7 is arranged at the outer side of the magnetic conduction pipe 8, the upper part of the valve rod 9 is in a hollow tube shape, a pipe inlet is connected with the mixing cavity 10, a pipe outlet is arranged at the side face of a necking part near the bottom, a cavity is formed between the necking part and the inner wall of an injection hole, the bottom of the valve rod 9 is an expanded spherical end matched with the size of a conical injection hole, and a gap between the expanded spherical end and the conical injection hole forms an injection outlet.
The upper part of the oil injection valve 2 is connected with an oil cap 1.
The oil-gas mixing seat 4 is arranged below the mixing cavity 10, the lower end of the oil-gas mixing seat 4 is connected with an air injection valve, and the diameter of a through hole at the lower end of the oil-gas mixing seat 4 is smaller than the diameter of an inlet at the upper end.
Claims (3)
1. An AADI injector component for a heavy oil and alcohol-based fuel engine is characterized in that an air injection valve mounting seat (3) is arranged at the lower part of an oil injection valve (2), a mixing cavity (10) is arranged in the air injection valve mounting seat (3), an air injection valve is connected and arranged below the mixing cavity (10), a valve body upper part of the air injection valve is provided with a valve core (5), the valve core (5) is fixedly connected with the upper part of a valve rod (9), the lower end surface of the valve core (5) is connected with the upper end of a pressure spring (6), the lower end of the pressure spring (6) is connected with the upper end of a magnetic conduction pipe (8), the magnetic conduction pipe (8) is fixed with the valve body, an electromagnet (7) is arranged at the outer side of the magnetic conduction pipe (8), the upper part of the valve rod (9) is in a hollow tube shape, a pipe inlet is connected with the mixing cavity (10), a pipe outlet is arranged at the side surface of a necking part near the bottom, the necking part and the inner wall of the injection hole forms a cavity, the bottom of the valve rod (9) is in a large spherical surface end which is matched with the conical injection hole size, and a gap between the large spherical surface end and the conical injection hole or the arc injection hole forms an injection outlet.
2. AADI injector assembly for heavy oil, alcohol-based fuel engines according to claim 1, characterized in that the upper part of the injection valve (2) is connected to an oil cap (1).
3. The AADI injector assembly for a heavy oil and alcohol-based fuel engine according to claim 1, wherein an oil-gas mixing seat (4) is arranged below the mixing chamber (10), the lower end of the oil-gas mixing seat (4) is connected with an air injection valve, and the diameter of a through hole at the lower end of the oil-gas mixing seat (4) is smaller than the diameter of an inlet at the upper end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421253024.3U CN222254183U (en) | 2024-06-04 | 2024-06-04 | AADI (anaerobic-anoxic-oxic) injector for heavy oil and alcohol-based fuel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421253024.3U CN222254183U (en) | 2024-06-04 | 2024-06-04 | AADI (anaerobic-anoxic-oxic) injector for heavy oil and alcohol-based fuel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN222254183U true CN222254183U (en) | 2024-12-27 |
Family
ID=93988209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202421253024.3U Active CN222254183U (en) | 2024-06-04 | 2024-06-04 | AADI (anaerobic-anoxic-oxic) injector for heavy oil and alcohol-based fuel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN222254183U (en) |
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2024
- 2024-06-04 CN CN202421253024.3U patent/CN222254183U/en active Active
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