Oil-gas flow guide device of air-assisted injection system

Abstract

The utility model aims to provide an oil-gas flow guide device of an air-assisted injection system. The oil-gas flow guide device is characterized by consisting of an oil-gas flow guide body and an O-shaped ring, the oil-gas flow guide body sequentially comprises a fuel oil end, a compressed air end and an oil-gas mixing end from top to bottom; the fuel oil end is provided with a fuel oil channel, the compressed air end is provided with a compressed air channel, the O-shaped ring is arranged on the oil-gas flow guide body and located between the fuel oil end and the compressed air end, and sealing and isolation of oil and gas are guaranteed. Through reasonable design of the compressed air channel, compressed air not only obtains movement pointing to the axis of the flow guide body, but also obtains circular movement with the axis of the flow guide body as the center. By means of the fuel oil atomization device, on the premise that system complexity is not increased, fuel oil can be effectively promoted to be broken into small-diameter liquid drops, the proportion of the small-diameter fuel oil liquid drops is increased, and therefore the final atomization effect of the fuel oil is remarkably improved.

Description

Technical Field

[0001] The present invention relates to an oil-gas diversion device for an air-assisted injection system, belonging to the technical field of internal combustion engines. Background Art

[0002] There are certain differences between the air-assisted injection system and the traditional electronically controlled injection system in the injection atomization process. The traditional electronically controlled injection system usually only conducts one injection to complete the atomization of fuel. The air-assisted injection system is divided into two injections, and the corresponding fuel is atomized twice. Through secondary injection atomization, the air-assisted injection system can greatly reduce the system working pressure while ensuring the fuel atomization effect, thereby simplifying the system structure and reducing the system complexity.

[0003] Two core components of the air-assisted injection system: the fuel nozzle and the air nozzle. The fuel nozzle is usually arranged above the air nozzle, responsible for injecting a fixed amount of fuel into the upper mixing chamber of the air nozzle, and pre-mixing with the compressed air here to complete the primary atomization of the fuel. Then the air nozzle works to spray the oil-gas mixture in the mixing chamber into the cylinder to complete the secondary atomization of the fuel. This fuel injection method can effectively solve the atomization problem of heavy oil fuel, atomize the heavy oil into extremely fine droplets, and meet the requirements of engine ignition. For the air-assisted injection system, the quality of the first fuel atomization plays a key role in the final atomization quality of the fuel. Therefore, in order to better achieve fuel atomization, an oil-gas diversion structure is usually arranged above the air nozzle to better guide the fuel to fully mix with the compressed air, enable the fuel to complete high-quality atomization, and be broken and dispersed into fine fuel droplets as much as possible to prepare for the secondary atomization of the fuel. Summary of the Invention

[0004] To solve the above problems, the purpose of the present invention is to provide an oil-gas diversion device for an air-assisted injection system, characterized in that the oil-gas diversion device includes an oil-gas guide body and an O-ring; the oil-gas guide body is successively a fuel end, a compressed air end, and an oil-gas mixing end from top to bottom; the fuel end is provided with a fuel passage, the compressed air end is provided with a compressed air passage, and the O-ring is arranged on the oil-gas guide body, between the fuel end and the compressed air end, to ensure the sealing and isolation of oil and gas.

[0005] Preferably, there is only one fuel passage on the oil-gas guide body, its axis coincides with the axis of the oil-gas guide body, and penetrates the oil-gas guide body to connect the fuel end and the oil-gas mixing end. The aperture size is usually taken as 0.6 mm to 3 mm, and is matched according to the actual fuel injection volume.

[0006] Preferably, the compressed air channels on the oil-gas guide body extend from the compressed air end to the oil-gas mixing end. The number of the compressed air channels is six, and they are evenly distributed on the circumference centered on the axis of the oil-gas guide body.

[0007] Preferably, the axes of the compressed air channels of the oil-gas guide body intersect with the end faces of the compressed air end and the oil-gas mixing end respectively to form 12 points. Circles are drawn with the 6 points on each end face. The two circles form an inverted conical surface, and the vertex of the conical surface is located on the axis of the oil-gas guide body, with an included angle a with the axis of the oil-gas guide body. The included angle a is 5°-15°.

[0008] Preferably, the plane where the axis of each compressed air channel on the oil-gas guide body passes through the axis of the oil-gas guide body and forms an included angle b with it. The included angle b is 20°-40°.

[0009] Preferably, the oil-gas guide body can be manufactured by powder metallurgy.

[0010] Preferably, the O-ring is a standard product on the market.

[0011] Beneficial effects

[0012] The oil-gas guide device of the air-assisted injection system of the present invention fully combines the advantages of the existing oil-gas guide body of the air-assisted injection system and improves the deficiencies at the same time. By adopting the oil-gas guide device of the air-assisted injection system of the present invention, a rotating air flow is formed in the oil-gas mixing cavity during use, strengthening the movement energy of air and fuel, thereby promoting more large-droplet fuel to break into fuel particles with small diameters, providing a good foundation for more fuel to be atomized into droplets meeting the requirements after secondary injection. This helps to stabilize the engine combustion and effectively reduce the generation of harmful exhaust substances such as CH. Description of the drawings

[0013] Figure 1 is the assembly structure diagram of the oil-gas guide device;

[0014] Figure 2 is the top view of the oil-gas guide body;

[0015] Figure 3 is the bottom view of the oil-gas guide body;

[0016] Figure 4 is Figure 2 the A-A sectional view of;

[0017] Figure 5 is the angle diagram of the compressed air channels of the oil-gas guide body;

[0018] Figure 6 is the working oil and gas flow direction diagram of the present invention;

[0019] In the figure:

[0020] 1 - air nozzle; 2 - guide rail housing; 3 - O-ring; 4 - oil-gas guide; 5 - fuel nozzle;

[0021] 41 - fuel end; 411 - fuel passage; 42 - compressed air end; 421 - compressed air passage;

[0022] 43 - oil-gas mixing end. Detailed implementation mode

[0023] The following further details the detailed implementation mode of the present invention in conjunction with the accompanying drawings.

[0024] As Figures 1 to 5 shown, an oil-gas diversion device for an air-assisted injection system provided by the present invention, the oil-gas diversion device includes an oil-gas guide (4) and an O-ring (3); the oil-gas guide (4) is successively the fuel end (41), the compressed air end (42) and the oil-gas mixing end (43) from top to bottom; the fuel end (41) is provided with a fuel passage (411); the compressed air end (42) is provided with a compressed air passage (421); the O-ring (3) is arranged on the oil-gas guide (4), between the fuel end (41) and the compressed air end (42), to ensure the sealing and isolation of oil and gas.

[0025] As Figure 3 shown, there is only one fuel passage (411) on the oil-gas guide (4), its axis coincides with the axis of the oil-gas guide (4) and penetrates through the oil-gas guide (4), connecting the fuel end (41) and the oil-gas mixing end (43), and the aperture size is usually taken as 0.6mm - 3mm, matching according to the actual fuel injection volume.

[0026] As Figure 2 and Figure 3 shown, the compressed air passage (421) on the oil-gas guide (4) extends from the compressed air end (42) to the oil-gas mixing end (43), and the number of the compressed air passages (421) is 6, evenly distributed on the circumference centered on the axis of the oil-gas guide (4).

[0027] As Figure 5 shown, the axes of the compressed air passages (421) of the oil-gas guide (4) intersect with the end faces of the compressed air end (42) and the oil-gas mixing end (43) respectively to form 12 points. Circles are made with 6 points on each end face, and the two circles form a conical surface as an inverted cone. The vertex of the conical surface is located on the axis of the oil-gas guide (4), and the included angle a with the axis of the oil-gas guide (4) is taken as 5° - 15°.

[0028] As Figure 5As shown in the figure, the plane where the axis of each compressed air channel (421) on the oil-gas guide body (4) is located passes through the axis of the oil-gas guide body (4) and forms an angle b with it, and the angle b is 20° to 40°.

[0029] Preferably, the oil-gas guide body can be manufactured by powder metallurgy, which has low cost and is convenient for mass production.

[0030] Preferably, the selected O-ring is a standard specification product, which is convenient and cheap to purchase.

[0031] Assembly process:

[0032] First, install the O-ring (3) onto the oil-gas guide body (4), that is, into the grooves at the fuel end (41) and the compressed air end (42), and assemble the oil-gas guiding device. Then install the assembled oil-gas guiding device onto the upper end of the air nozzle (1), install the air nozzle (1) with the installed oil-gas guiding device into the corresponding installation hole of the guide rail housing (2), and finally install the fuel nozzle (5) into the reserved installation hole of the guide rail housing (1) to complete the basic installation of each component. After installation, the whole is as Figure 1 shown.

[0033] Working principle:

[0034] As Figure 1 shown, during the normal operation of the engine, compressed air is delivered to the compressed air cavity through pipelines, etc., that is, to the compressed air end (42) on the oil-gas guide body (4), and then is guided by the compressed air channels (421) on the oil-gas guide body (4) and sprayed out from the oil-gas mixing end (43) and reaches the mixing cavity above the air nozzle (1). In addition, during the normal operation of the engine, the fuel nozzle (5) injects a certain amount of fuel into the upper end of the oil-gas guiding device according to the instructions issued by the engine electronic control unit, that is, the fuel end (41) of the oil-gas guide body (4). The fuel is guided by the fuel channels (411) on the oil-gas guide body (4) and sprayed out from the oil-gas mixing end (43) and reaches the mixing cavity above the air nozzle (1), and completes mixing with the compressed air here to form an oil-gas mixture. Immediately afterwards, the air nozzle (1) starts to work under the control of the engine electronic control unit, sprays the oil-gas mixture in the mixing cavity into the engine combustion chamber, and thus completes the secondary injection and atomization of the fuel.

[0035] As Figure 6As shown, during operation, compressed air enters through the compressed air end (42) on the oil-gas guide (4) and exits from the oil-gas mixing end (43). Through the guidance of the compressed air passage (421), when the compressed air exits from the oil-gas mixing end (43), it not only has a velocity directed towards the axis of the guide (4), but more importantly, it imparts a circular motion centered on the axis of the oil-gas guide (4) to the compressed air. The compressed air moving axially towards the guide (4) impacts the fuel injection ejected from the fuel passage (411), forcing the fuel to break into smaller-diameter fuel droplets. The circular motion of the compressed air generates a force for the small-diameter fuel droplets to escape from the fuel injection axis, causing the broken small-diameter fuel droplets to move towards the periphery of the injection axis, increasing the movement range of the fuel droplets, preventing the broken small droplets from re-aggregating and converging into large-diameter droplets, thereby effectively increasing the proportion of small-diameter droplets in the mixing chamber and significantly enhancing the secondary fuel atomization effect.

[0036] The O-ring (3) on the oil-gas guiding device between the fuel end (41) and the compressed air end (42) can effectively prevent premature mixing of fuel and compressed air and mixing outside the mixing chamber, while reducing the amount of fuel escape, making the actual fuel injection amount into the combustion chamber per engine cycle more in line with the theoretical demand and making the engine operation more stable.

[0037] The above specific exemplary embodiments of the present invention are for the purpose of illustration and exemplification, but the present invention is not limited to these embodiments. Any improvement or substitution based on the basic spirit of this embodiment still falls within the scope protected by the claims of the present invention.

Claims

1. An oil and gas flow guide device for an air-assisted injection system, characterized in that: The oil-gas flow guiding device comprises an oil-gas flow guiding body and an O-ring; the oil-gas flow guiding body comprises a fuel end, a compressed air end and an oil-gas mixing end from top to bottom; the fuel end is provided with a fuel channel, the compressed air end is provided with a compressed air channel, and the O-ring is arranged on the oil-gas flow guiding body, located between the fuel end and the compressed air end, to ensure the sealing and isolation of oil and gas.

2. The oil and gas flow guide device of the air-assisted injection system according to claim 1, characterized in that There is only one fuel channel on the oil-gas guide body, whose axis coincides with the axis of the oil-gas guide body and passes through the oil-gas guide body to connect the fuel end with the oil-gas mixing end. The aperture size is usually 0.6mm to 3mm, which is matched according to the actual fuel injection amount.

3. The oil and gas flow guide device of the air-assisted injection system according to claim 1, characterized in that The compressed air channel on the oil-gas guiding body extends from the compressed air end to the oil-gas mixing end. The number of the compressed air channels is 6 and they are evenly distributed on a circle centered on the axis of the oil-gas guiding body.

4. The oil and gas flow guide device of the air-assisted injection system according to claim 1, characterized in that The axes of the compressed air channels of the oil-gas guiding body intersect with the compressed air end face and the oil-gas mixing end face to form 12 points respectively. A circle is made with the 6 points on each end face. The curved surfaces of the two circles are inverted cone-shaped conical surfaces. The apex of the conical surface is located on the axis of the oil-gas guiding body and forms an angle a with the axis of the oil-gas guiding body. The angle a is 5° to 15°.

5. The oil and gas flow guide device of the air-assisted injection system according to claim 1, characterized in that The plane where the axis of each compressed air channel on the oil-gas guiding body lies passes through the axis of the oil-gas guiding body and forms an angle b with the axis, and the angle b is 20° to 40°.

6. The oil and gas flow guide device of the air-assisted injection system according to claim 1, characterized in that The oil-gas conducting body can be manufactured by powder metallurgy.

7. The oil and gas flow guiding device of the air-assisted injection system according to claim 1, characterized in that The O-ring is a product of standard specifications on the market.

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