CN210769103U - Fuel-air guide rail structure for air-entraining direct injection engine - Google Patents
Fuel-air guide rail structure for air-entraining direct injection engine Download PDFInfo
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- CN210769103U CN210769103U CN201921520845.8U CN201921520845U CN210769103U CN 210769103 U CN210769103 U CN 210769103U CN 201921520845 U CN201921520845 U CN 201921520845U CN 210769103 U CN210769103 U CN 210769103U
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Abstract
The utility model aims at providing a fuel-air guide rail structure for pressing from both sides gas direct injection engine. The fuel-air guide rail structure mainly comprises a fuel rail, an air rail and a fastening screw, wherein a fuel nozzle mounting hole, an oil inlet, an oil return channel, an oil return port and a fuel pressure regulating valve mounting hole are arranged on the fuel rail, and the fuel-air guide rail structure mainly provides fuel with stable pressure for a direct injection nozzle. Arrange air inlet, air flue, directly spout nozzle mounting hole, fuel pressure regulating valve mounting hole and cylinder cap mounting hole on the air rail, mainly spray the compressed air that the nozzle provided stable pressure for directly. The upper half part of the mounting hole of the fuel pressure regulating valve is arranged on the fuel rail and communicated with return oil, the lower half part of the mounting hole of the fuel pressure regulating valve is arranged on the air rail and communicated with compressed air, and the fuel pressure regulating valve controls the fuel pressure through the fixed pressure difference between the fuel pressure and the compressed air. Since the overall temperature of the fuel-air rail is not high, no forced cooling is required. The structure simplifies the structure of the cylinder cover, effectively reduces the heat load of the cylinder cover, and prolongs the service life of the engine.
Description
Technical Field
The utility model relates to a fuel-air guide rail structure for air-entraining direct injection engine, which belongs to the internal combustion engine part structure.
Background
The air-entraining direct injection system is premixed with fuel oil through compressed air, then an oil-gas mixture is injected into a cylinder at a high speed through a direct injection nozzle, and the fuel oil is atomized into superfine liquid drops at a high speed and is rapidly evaporated. On one hand, the requirement of the engine on a fuel system is greatly reduced, and on the other hand, the spray diffusion mixing process is quicker.
Air-entraining direct injection systems are widely used in the field of two-stroke unmanned aerial vehicle engines. The adoption of the gas-entraining direct injection system can realize the ignition and combustion of heavy oil fuels such as aviation kerosene, diesel oil and the like, avoid the disadvantage of low power-to-weight ratio of the traditional compression ignition engine and meet the power-to-weight ratio requirement of the existing unmanned aerial vehicle on the heavy oil engine.
For a water-cooled air-entraining direct injection engine, a fuel nozzle, a direct injection nozzle, a fuel pressure regulating valve mounting hole, a fuel oil duct and a compressed air duct can be directly integrated into a cylinder cover, and the cylinder cover is directly cooled by utilizing a cooling water jacket. However, for the air-cooled air-entrainment direct injection engine, if the whole air-entrainment direct injection system is integrated on the cylinder cover, the cylinder cover is too complex and is not beneficial to cooling the cylinder cover, so that the thermal load of the cylinder cover is higher, and the service life of the cylinder cover is influenced.
Disclosure of Invention
To solve the above problems, the present invention provides a fuel-air rail structure for a direct injection engine with air entrainment. The fuel-air guide rail structure mainly comprises a fuel rail, an air rail and a fastening screw, wherein a fuel nozzle mounting hole, an oil inlet, an oil return channel, an oil return port and a fuel pressure regulating valve mounting hole are arranged on the fuel rail, and the fuel-air guide rail structure mainly provides fuel with stable pressure for a direct injection nozzle. Arrange air inlet, air flue, directly spout nozzle mounting hole, fuel pressure regulating valve mounting hole and cylinder cap mounting hole on the air rail, mainly spray the compressed air that the nozzle provided stable pressure for directly. The upper half part of the mounting hole of the fuel pressure regulating valve is arranged on the fuel rail and communicated with return oil, the lower half part of the mounting hole of the fuel pressure regulating valve is arranged on the air rail and communicated with compressed air, and the fuel pressure regulating valve controls the fuel pressure through the fixed pressure difference between the fuel pressure and the compressed air. Since the overall temperature of the fuel-air rail is not high, no forced cooling is required. The structure only needs to design the fuel-air guide rail mounting hole on the cylinder cover, so that the structure of the cylinder cover can be greatly simplified, the heat load of the cylinder cover is effectively reduced, and the service life of an engine is prolonged.
The present invention will be described in more detail with reference to the accompanying drawings and the following detailed description.
Drawings
FIG. 1 is a front view of a fuel-air rail
FIG. 2 is a top view of a fuel-air rail
FIG. 3 is a cross-sectional view of a fuel-air rail direct injection nozzle mounting hole and air passage
FIG. 4 is a cross-sectional view of a fuel-air rail fuel gallery and fuel regulator valve mounting hole
In the figure: 1-fuel rail 2-gas rail 3-fastening bolt 4-cylinder cap mounting hole 5-direct injection nozzle mounting hole 6-fuel nozzle mounting hole 7-oil inlet 8-oil return passage 9-oil return port 10-fuel pressure regulating valve mounting hole 11-oil passage 12-pressure stabilizing cavity 13-air inlet 14-air passage.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings:
as shown in figure 1, the embodiment relates to a fuel-air guide rail structure for an air-entraining direct injection engine, which consists of three parts, namely a fuel rail 1, an air rail 2 and a fastening screw 3, wherein the fuel rail 1 and the air rail 2 are fixed together by the fastening screw 3, a fuel nozzle mounting hole 6, an oil inlet 7, an oil return channel 8, an oil return port 9 and the upper half part of a fuel pressure regulating valve mounting hole 10 are arranged on the fuel rail 1, the oil inlet 7 and the oil return port 9 are arranged on the same side and are in a parallel structure so as to be convenient for installation on the engine, the oil return channel 8 is connected with the fuel pressure regulating valve mounting hole 10 by adopting an inclined oil channel structure, and an inclined oil channel angle α is between 30 degrees and 45 degrees so as to be convenient for processing, the direct injection nozzle mounting hole 5, a pressure stabilizing cavity 12, an air inlet 13, an air channel 14, the lower half part of the fuel pressure regulating valve mounting hole 10 and a cylinder head mounting hole 4 are arranged on the air channel 13 so as to reduce the influence of the pressure of the direct injection nozzle mounting hole 5, the fuel nozzle mounting hole 5 and the air rail 6, so that the air pressure fluctuation of the cylinder head mounting hole can be greatly reduced, and the effective load of the cylinder head can be reduced by 90 degrees, and the air cylinder head mounting structure, and the air pressure of the cylinder head mounting hole.
The assembly process of this embodiment is as follows:
firstly, a fuel nozzle is arranged in a mounting hole 6, a fuel pressure regulating valve is arranged in a mounting hole 10, a fuel rail 1 and an air rail 2 are fixed through a fastening screw 3, then the upper half part of a direct injection nozzle is arranged in a mounting hole 5, the lower half part of the direct injection nozzle is arranged in a mounting hole in a cylinder cover, and a fuel-air guide rail is fixed on the cylinder cover through a cylinder cover mounting hole 4, so that the whole fuel-air guide rail is assembled.
The working flow of the embodiment is as follows:
referring to fig. 3 and 4, a fuel nozzle mounting hole 6, an oil inlet 7, an oil return passage 8, an oil return port 9 and an upper half of a fuel pressure regulating valve mounting hole 10 are disposed on the fuel rail 4. The fuel enters the fuel rail 1 through the oil inlet 7, a part of the fuel enters the fuel nozzle, and the fuel enters the direct injection nozzle through the fuel nozzle through the oil duct 11; the other part enters a fuel pressure regulating valve through an oil return channel 8, the fuel pressure regulating valve controls the fuel pressure through the fixed pressure difference between the fuel pressure and the compressed air, when the fuel pressure reaches the target pressure, the fuel pressure regulating valve is opened, and the fuel returns to the fuel tank through an oil return port 9. Compressed air enters the air rail pressure stabilizing cavity 12 through the air inlet 13 and then enters the direct injection nozzle through the air passage 14, so that oil supply and air supply of the air-entraining direct injection system are realized.
Claims (6)
1. A fuel-air guide rail structure for an air-entraining direct injection engine is composed of a fuel rail (1), an air rail (2) and a fastening screw (3), wherein the fuel rail (1) and the air rail (2) are fixed together by the fastening screw (3); the fuel rail (1) is provided with a fuel nozzle mounting hole (6), an oil inlet (7), an oil return channel (8), an oil return port (9) and the upper half part of a fuel pressure regulating valve mounting hole (10), and is mainly used for providing fuel with stable pressure for a direct injection nozzle; the air rail (2) is provided with a direct injection nozzle mounting hole (5), an air inlet (12), an air passage (13), a lower half part of a fuel pressure regulating valve mounting hole (10) and a cylinder cover mounting hole (4), and compressed air with stable pressure is mainly provided for a direct injection nozzle; finally, the fuel-air guide rail is fixed on the cylinder cover through a cylinder cover mounting hole (4); for an air-cooled engine, the structure of the cylinder cover can be greatly simplified by the fuel-air guide rail structure, and the heat load of the cylinder cover is effectively reduced, so that the service life of the engine is prolonged.
2. The fuel-air guide rail according to claim 1, characterized in that the oil inlet (7) and the oil return (9) are arranged on the same side in a parallel configuration for easy installation in an engine.
3. The fuel-air rail according to claim 1, characterized in that the fuel nozzle mounting hole (6) is arranged at 90 ° to the direct injection nozzle mounting hole (5).
4. The fuel-air guide rail of claim 1, wherein the oil return passage (8) is connected to the fuel pressure regulating valve mounting hole (10) using a slant passage structure, and the slant passage angle α is between 30 ° and 45 ° for easy machining.
5. The fuel-air rail according to claim 1, characterized in that the inlet port (12) and the air duct (13) are arranged on both sides of the surge chamber to reduce the influence of pressure fluctuations caused by the inlet air on the air duct supply pressure.
6. The fuel-air rail according to claim 1, characterized in that the direct injection nozzle mounting hole (5) and the fuel nozzle mounting hole (6) are arranged at 90 ° to reduce the height of the entire fuel-air rail.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921520845.8U CN210769103U (en) | 2019-09-09 | 2019-09-09 | Fuel-air guide rail structure for air-entraining direct injection engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921520845.8U CN210769103U (en) | 2019-09-09 | 2019-09-09 | Fuel-air guide rail structure for air-entraining direct injection engine |
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| Publication Number | Publication Date |
|---|---|
| CN210769103U true CN210769103U (en) | 2020-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921520845.8U Active CN210769103U (en) | 2019-09-09 | 2019-09-09 | Fuel-air guide rail structure for air-entraining direct injection engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114753993A (en) * | 2022-03-25 | 2022-07-15 | 江铃汽车股份有限公司 | Noise reduction method and system for automobile oil pump |
-
2019
- 2019-09-09 CN CN201921520845.8U patent/CN210769103U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114753993A (en) * | 2022-03-25 | 2022-07-15 | 江铃汽车股份有限公司 | Noise reduction method and system for automobile oil pump |
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