Gas-assisted fuel injector assembly

Abstract

The utility model discloses a gas-assisted fuel injector assembly which comprises a fuel metering structure, the fuel metering structure comprises a mounting and connecting oil cap, a pressure stabilizing valve and a fuel injector, the mounting and connecting oil cap is provided with an oil inlet channel, an oil return channel and a first through hole, the first through hole is communicated with the oil inlet channel and the oil return channel, the oil return channel bears the pressure stabilizing valve, and the fuel injector is connected with the pressure stabilizing valve. The fuel injector is arranged at one end of the fuel inlet channel; the fuel oil atomization structure comprises a mounting and connecting gas cap and an air auxiliary ejector, the mounting and connecting gas cap is provided with a fuel oil cavity, a gas cavity, a gas inlet channel and an oil-gas premixing cavity, the fuel oil cavity is communicated with the oil-gas premixing cavity through a second through hole, one end of the gas cavity is communicated with the oil-gas premixing cavity through a third through hole, and the other end of the gas cavity is communicated with the air auxiliary ejector. The gas inlet channel is communicated with the oil-gas premixing cavity through a fourth through hole, the fuel oil injector is arranged in the fuel oil cavity, the gas cavity bears the pressure stabilizing valve, and the air auxiliary injector is connected with the oil-gas premixing cavity. According to the utility model, hyperfine atomization spraying can be realized, so that the combustion efficiency can be improved.

Description

Technical Field

[0001] The utility model belongs to the field of fuel injectors. More specifically, the utility model relates to an air-assisted fuel injector assembly. Background Art

[0002] The fuel injector belongs to the fuel injection system, and the fuel injection system refers to a fuel supply device that directly injects a certain amount of fuel into the cylinder or intake port under a certain pressure by using an injector. Fine atomization is a major problem faced by fuel engines, especially for heavy oil engines. Patent Publication No. CN111120174A discloses a fuel injection integrated control system, including: a fuel injector and an air-assisted injector. The air-assisted fuel injection integrated control system further includes a composite chamber, and the fuel injector and the air-assisted injector are respectively fixedly connected to the composite chamber; wherein fuel passes through the fuel injector, and gas passes through the air-assisted injector for mixed atomization injection. This technical solution realizes the fuel injection effect through the fuel injector, realizes the air injection effect through the air-assisted injector, and combines the above-mentioned devices into one body through the composite chamber, with a stable structure. However, this system lacks oil pressure and air pressure regulating devices, and it is difficult for the fuel injector to achieve accurate metering of injected fuel when the system pressure (oil pressure, air pressure) changes. Summary of the Invention

[0003] One object of the utility model is to solve at least the above problems and provide at least the advantages described hereinafter.

[0004] One object of the utility model is to provide an air-assisted fuel injector assembly that can stabilize the oil pressure and air pressure in the system and meet the requirement that the fuel injector accurately meters and injects fuel when the system pressure (oil pressure, air pressure) fluctuates.

[0005] To achieve these objects and other advantages of the utility model, there is provided an air-assisted fuel injector assembly, which includes:

[0006] A fuel metering structure, including a mounting connection oil cap, a pressure stabilizing valve, and a fuel injector. The mounting connection oil cap is provided with an oil inlet passage, an oil return passage, and a first through hole. The first through hole communicates with the oil inlet passage and the oil return passage. One end of the oil return passage bears the pressure stabilizing valve, and the oil inlet end of the fuel injector is arranged at one end of the oil inlet passage;

[0007] Fuel atomization structure, including an installation connecting air cap and an air-assisted injector. The installation connecting air cap is provided with a fuel chamber, an air chamber, an air inlet passage, and a fuel-air premixing chamber. The fuel chamber communicates with the fuel-air premixing chamber through a second intersecting hole. One end of the air chamber communicates with the fuel-air premixing chamber through a third intersecting hole. The air inlet passage communicates with the fuel-air premixing chamber through a fourth intersecting hole. The injection end of the fuel injector is arranged in the fuel chamber. The other end of the air chamber bears a pressure stabilizing valve. The air inlet end of the air-assisted injector is connected to the fuel-air premixing chamber.

[0008] Preferably, the other end of the fuel inlet passage is connected to a first fuel connector, and the other end of the fuel return passage is connected to a second fuel connector.

[0009] Preferably, a gas connector is arranged on the air inlet passage.

[0010] Preferably, it further includes a fuel filter, and the fuel filter is arranged on the fuel passage to filter the fuel entering the fuel-air premixing chamber.

[0011] Preferably, it further includes an air filter, and the air filter is arranged on the air flow passage to filter the air entering the fuel-air premixing chamber.

[0012] Preferably, the cross-section of the fuel-air premixing chamber is circular. The air inlet end of the air-assisted injector is arranged in the middle of the fuel-air premixing chamber. The fourth intersecting hole is arranged on the side of the fuel-air premixing chamber. The perpendicular distance between the axis of the air-assisted injector and the axis of the fourth intersecting hole is 5-15 mm.

[0013] Preferably, the included angle between the axis of the fuel injector and the axis of the air-assisted injector is 60-120°.

[0014] The utility model has at least the following beneficial effects: First, by setting a pressure stabilizing valve, the utility model can adjust the oil pressure and air pressure of the system to make the back pressure at the inlet and outlet of the fuel injector constant, so as to meet the precise metering requirements of fuel when the system pressure (oil pressure, air pressure) fluctuates. Second, the included angle between the axis of the fuel injector and the axis of the air-assisted injector of the utility model is 60-120 degrees, so as to achieve a significant reduction in the height direction and play a role in saving the installation and layout space of the assembly. Third, the axis of the fourth intersecting hole of the utility model deviates from the center of the air-assisted injector by 5-15 mm, so that the air flow forms a swirling effect in the premixing chamber, improving the fuel-air mixing efficiency. Fourth, the utility model is used for fuel atomization injection in the fuel supply system of a small piston engine, especially suitable for multi-fuel injection such as heavy oil, realizing ultra-fine atomization injection, which is beneficial to fuel-air mixing combustion and improving the combustion efficiency.

[0015] Other advantages, objectives and features of the present utility model will be partially reflected by the following description and partially understood by those skilled in the art through the research and practice of the present utility model. Description of the Drawings

[0016] Figure 1 It is a schematic three-dimensional structure diagram of a technical solution of the present utility model;

[0017] Figure 2 It is a sectional view taken along line A-A of a technical solution of the present utility model;

[0018] Figure 3 It is a sectional view taken along line B-B of a technical solution of the present utility model;

[0019] Figure 4 It is a sectional view taken along line C-C of a technical solution of the present utility model;

[0020] Figure 5 It is a schematic diagram of the installation angle between the fuel injector and the air-assisted injector of a technical solution of the present utility model;

[0021] Figure 6 It is a schematic structural diagram of a technical solution of the present utility model.

[0022] 1. Second fuel joint; 2. Installation connection oil cap; 201. Oil inlet channel; 202. Oil return channel; 203. First intersection hole; 3. Pressure stabilizing valve; 4. Fuel injector; 5. Installation connection air cap; 501. Fuel chamber; 502. Air chamber; 503. Air inlet channel; 504. Oil-gas premixing chamber; 505. Second intersection hole; 506. Third intersection hole; 507. Fourth intersection hole; 6. Air-assisted injector; 7. Air filter; 8. Gas joint. Detailed Embodiment

[0023] The following further detailed description of the present utility model is made in conjunction with the drawings so that those skilled in the art can implement it according to the description in the specification.

[0024] It should be understood that the terms such as "having", "comprising" and "including" used herein do not exclude the presence or addition of one or more other elements or their combinations.

[0025] It should be noted that in the description of the present utility model, unless otherwise clearly specified and defined, the terms "installation", "connection", and "setting" should be understood in a broad sense. For example, they can be fixedly connected and set, or detachably connected and set, or integrally connected and set. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. The orientation or positional relationships indicated by the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0026] As Figure 1-6 shown, the present utility model provides an air-assisted fuel injector assembly, which includes:

[0027] A fuel metering structure, including a mounting connection oil cap 2, a pressure stabilizing valve 3, and a fuel injector 4. The mounting connection oil cap 2 is provided with an oil inlet passage 201, an oil return passage 202, and a first through hole 203. The first through hole 203 is communicated with the oil inlet passage 201 and the oil return passage 202. One end of the oil return passage 202 bears the pressure stabilizing valve 3, and the oil inlet end of the fuel injector 4 is arranged at one end of the oil inlet passage 201;

[0028] A fuel atomization structure, including a mounting connection air cap 5 and an air-assisted injector 6. The mounting connection air cap 5 is provided with a fuel chamber 501, an air chamber 502, an air inlet passage 503, and a fuel-gas premixing chamber 504. The fuel chamber 501 is communicated with the fuel-gas premixing chamber 504 through a second through hole 505. One end of the air chamber 502 is communicated with the fuel-gas premixing chamber 504 through a third through hole 506. The air inlet passage 503 is communicated with the fuel-gas premixing chamber 504 through a fourth through hole 507. The injection end of the fuel injector 4 is arranged in the fuel chamber 501. The other end of the air chamber 502 bears the pressure stabilizing valve 3, and the air inlet end of the air-assisted injector 6 is connected to the fuel-gas premixing chamber 504.

[0029] High-pressure fuel enters the assembly through the fuel inlet pipe. After being stabilized by the pressure stabilizing valve 3, the excess fuel flows back to the fuel tank through the oil return passage 202; the regulated fuel enters the fuel injector 4, and is precisely metered by the fuel injector 4 and then injected into the fuel-gas premixing chamber 504; high-pressure gas enters the fuel-gas premixing chamber 504 through the air inlet passage 503 from the air inlet. The gas and fuel are premixed in the fuel-gas premixing chamber 504. The control system precisely controls the timely atomizing injection of the air-assisted injector 6, and the fuel-gas two-phase fluid is atomized and ejected at high speed and enters the engine cylinder for combustion.

[0030] Fuel flows through the fuel inlet passage 201 to the pressure stabilizing valve 3 via the first through hole 203 and then flows out through the fuel return passage 202. The fuel inlet passage 201 and the fuel return passage 202 can be arranged on the mounting and connecting fuel cap 2 in any structural form. Preferably, the fuel inlet passage 201 and the fuel return passage 202 are arranged in parallel on the mounting and connecting fuel cap 2.

[0031] Sealing rings are provided at the connecting parts of the pressure stabilizing valve 3 with the fuel return passage 202 and the air chamber 502 for sealing; sealing rings are also provided at the connecting parts of the fuel injector 4 with the fuel inlet passage 201 and the fuel chamber 501; a sealing ring is also provided at the connecting part of the air-assisted injector 6 with the oil-gas premixing chamber 504 for sealing.

[0032] The axis of the air-assisted injector 6 and the axis of the fuel injector 4 can be at any angle. The axis of the fourth through hole 507 and the axis of the air-assisted injector 6 can be at any angle. Preferably, this angle is 90°.

[0033] The pressure stabilizing valve 3, the fuel injector 4, and the air-assisted injector 6 of the present utility model are all prior arts and can be purchased in the market. Therefore, they will not be elaborated here.

[0034] In another technical solution, the other end of the fuel inlet passage 201 is connected to the first fuel connector, and the other end of the fuel return passage 202 is connected to the second fuel connector 1. Fuel is sprayed into the oil-gas premixing chamber 504 through the first fuel connector and the fuel injector 4. The excess fuel after being stabilized by the fuel pressure stabilizing valve 3 flows back to the fuel tank through the fuel return passage 202 and the second fuel connector 1. The first fuel connector and the fuel inlet passage 201, and the second fuel connector 1 and the fuel return passage 202 can be hermetically connected by any means such as adding bolts or their own threads.

[0035] In another technical solution, a gas connector 8 is provided on the air inlet passage 503. The gas connector 8 and the air inlet passage 503 can be hermetically connected by any means such as adding bolts or their own threads.

[0036] In another technical solution, a fuel filter is further included. The fuel filter is arranged on the fuel passage to filter the fuel entering the oil-gas premixing chamber 504. Since the fuel filter is used to filter fuel, the fuel filter can be arranged at any position on the fuel passage, that is, at any position between the first fuel connector and the oil-gas premixing chamber 504. When the fuel is clean and free of impurities, the present utility model may not include a fuel filter either.

[0037] In another technical solution, an air filter 7 is further included. The air filter 7 is disposed on the air flow channel to filter the air entering the oil-gas premixing chamber 504. Since the air filter 7 is used to filter the air, in the past, the filter could be disposed at any position on the air flow channel, that is, at any position between the gas joint 8 and the oil-gas premixing chamber 504. In some technical solutions, the axis of the intake channel 503 and the axis of the fourth through hole are on the same axis. The air filter 7 can be disposed inside the oil-gas premixing chamber 504, that is, the air is discharged through the fourth through hole, passes through the air filter 7, and enters the oil-gas premixing chamber 504. When the air does not contain particulate impurities, the air filter 7 may not be included in the present invention.

[0038] In another technical solution, the cross section of the oil-gas premixing chamber 504 is circular. The intake end of the air-assisted injector 6 is disposed in the middle of the oil-gas premixing chamber 504, and the fourth through hole 507 is disposed on the side of the oil-gas premixing chamber 504. The perpendicular distance between the axis of the air-assisted injector 6 and the axis of the fourth through hole 507 is 5-15 mm. The air flow enters the oil-gas premixing chamber 504 from the fourth through hole 507. When the fourth through hole 507 and the center of the air-assisted injector 6 are offset by 5-15 mm, that is Figure 4 where L in is 5-15 mm, a swirling effect of the air flow can be formed inside the oil-gas premixing chamber 504, improving the oil-gas mixing efficiency.

[0039] In another technical solution, the included angle between the axis of the fuel injector 4 and the axis of the air-assisted injector 6 is 60-120°. By controlling the included angle between the axis of the fuel injector 4 and the axis of the air-assisted injector 6, a significant reduction in the height direction can be achieved, playing a role in saving the installation and layout space of the assembly.

[0040] Although the embodiments of the present invention have been disclosed as above, they are not limited to only the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated examples here.

Claims

1. A gas-assisted fuel injector assembly, characterized in that: include: The fuel metering structure comprises an oil cap for installation and connection, a pressure regulating valve and a fuel injector, wherein the oil cap for installation and connection is provided with an oil inlet passage, an oil return passage and a first intersecting hole, the first intersecting hole is connected with the oil inlet passage and the oil return passage, one end of the oil return passage carries the pressure regulating valve, and the oil inlet end of the fuel injector is provided at one end of the oil inlet passage; The fuel atomization structure comprises an installation connection gas cap and an air-assisted injector, wherein the installation connection gas cap is provided with a fuel cavity, an air cavity, an air intake passage and an oil-gas premixing cavity, the fuel cavity is connected with the oil-gas premixing cavity through a second intersecting hole, one end of the air cavity is connected with the oil-gas premixing cavity through a third intersecting hole, the air intake passage is connected with the oil-gas premixing cavity through a fourth intersecting hole, the injection end of the fuel injector is arranged in the fuel cavity, the other end of the air cavity carries a pressure-stabilizing valve, and the air intake end of the air-assisted injector is connected with the oil-gas premixing cavity.

2. The gas-assisted fuel injector assembly according to claim 1, characterized in that: The other end of the oil inlet passage is connected to the first fuel connector, and the other end of the oil return passage is connected to the second fuel connector.

3. The gas-assisted fuel injector assembly according to claim 1, characterized in that: A gas connector is provided on the air inlet passage.

4. The gas-assisted fuel injector assembly according to claim 1, characterized in that: The utility model also comprises a fuel filter, wherein the fuel filter is arranged on the fuel passage to filter the fuel entering the fuel-air premixing chamber.

5. The gas-assisted fuel injector assembly according to claim 1, characterized in that: The utility model also comprises an air filter, which is arranged on the air flow channel to filter the air entering the oil-air premixing chamber.

6. The gas-assisted fuel injector assembly according to claim 1, characterized in that: The cross-section of the oil-gas premixing chamber is circular, the air inlet end of the air-assisted injector is arranged in the middle of the oil-gas premixing chamber, the fourth intersecting hole is arranged on the side of the oil-gas premixing chamber, and the vertical distance between the axis of the air-assisted injector and the axis of the fourth intersecting hole is 5-15 mm.

7. The gas-assisted fuel injector assembly according to claim 1, characterized in that: The angle between the axis of the fuel injector and the axis of the air-assisted injector is 60-120°.

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