Air-assisted fuel injection system

Abstract

The utility model aims to provide an air-assisted fuel injection system. The air-assisted fuel injection system is characterized by comprising a compressed air part, a fuel conveying part and an oil gas injection part, the compressed air part comprises an air compressor, a gas pipeline and an oil-water separator, the air compressor continuously generates compressed gas during operation, and uninterrupted compressed air with certain pressure is provided for the oil-gas injection part; the fuel oil conveying part comprises a fuel oil pump, a fuel oil tank, a fuel oil pipeline, a one-way valve, a filter, a pressure regulator and an overflow valve, and provides stable fuel oil for the oil gas injection part; the oil gas injection part comprises a fuel injector, an air injector and a shell for bearing the two injectors. According to the utility model, the adaptability of the facility equipment to the use environment is greatly enhanced, and the reliability and stability of the facility equipment in the extreme environment are effectively ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to an air-assisted fuel injection system, belongs to the technical category of internal combustion engine. BACKGROUND

[0002] The air-assisted fuel injection system mainly relies on the impact and crushing effect of compressed air on fuel to realize the atomization of fuel. Thanks to the innovative secondary atomization principle, the whole system does not need a great injection pressure like the high-pressure common rail system to easily atomize heavy oil fuel into extremely fine particles, and completely meets the demand of spark plug ignition, making the spark ignition heavy oil engine a reality. At the same time, the air-assisted fuel injection system has excellent adaptability to the environment, and still has excellent atomization effect in extremely cold, high temperature, humid and other environments. Therefore, the air-assisted fuel injection system is favored by various extreme environment power devices, such as snowmobile power, various heavy armored equipment engine preheating and heat preservation devices, etc.

[0003] Due to the harshness of extreme environmental conditions, higher requirements are put forward for the working reliability of the air-assisted fuel injection system. For example, excessive humidity can corrode the system equipment, and the stability of electronic products at extremely low temperature can affect the reliability of system work. Therefore, it is necessary to optimize the existing air-assisted fuel injection system, especially the optimization measures to ensure fuel delivery and oil pressure stability in extreme environments. SUMMARY

[0004] To solve the above problems, the purpose of the utility model is to provide an air-assisted fuel injection system, which is characterized by being composed of a compressed air part, a fuel delivery part and an oil and gas injection part; the compressed air part includes an air compressor, a gas pipeline and an oil-water separator, the air compressor continuously generates compressed gas during operation to provide uninterrupted compressed air with a certain pressure for the oil and gas injection part; the fuel delivery part includes a fuel pump, a fuel tank, a fuel pipeline, a check valve, a filter, a pressure regulator and an overflow valve, which provides stable fuel for the oil and gas injection part; the oil and gas injection part includes a fuel injector, an air injector and a shell bearing the above two injectors.

[0005] Preferably, the oil-water separator is arranged immediately after the air compressor.

[0006] Preferably, the compressed air can reach the oil and gas injection part and the pressure regulator through two paths after passing through the oil-water separator, or can reach them in the order of one path only.

[0007] Preferably, the fuel delivery part is a self-oil-return type oil circuit, controlled by a pressure regulator, which is a mechanical pressure regulator, and the fuel pump is a flow-adjustable fuel pump, and the oil circuit oil pressure is jointly adjusted by the compressed air pressure value and the fuel pump.

[0008] Preferably, the fuel delivery part is further provided with a one-way valve, and the one-way valve is in a direction from the fuel pump to the oil-gas injection part.

[0009] Preferably, the fuel delivery part is provided with a bypass circuit composed of the overflow valve, and the bypass circuit can effectively guide the excess fuel directly to the fuel tank when the fuel pump is overloaded, and the bypass circuit is arranged before the one-way valve.

[0010] Advantages

[0011] The air-assisted fuel injection system of the utility model, according to some problems exposed in the use of the existing air-assisted fuel injection system, is optimized. Adopting the air-assisted fuel injection system of the utility model, the system failure rate is effectively reduced, the oil pressure of the fuel system is continuously and stably ensured in the running or off state of the engine, and the fuel system failure caused by the overload of the oil pump is effectively avoided, and the engine loaded with the technology can be stably and reliably operated in various complex and severe environments (such as extreme cold and humidity). BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a use state diagram of the utility model;

[0013] In the drawing:

[0014] 10-compressed air part; 101-air compressor; 102-gas pipeline; 103-oil-water separator;

[0015] 20-fuel delivery part; 201-fuel pump; 202-fuel pipeline; 203-one-way valve;

[0016] 204-pressure regulator; 205-fuel tank; 206-filter; 207-overflow valve;

[0017] 30-oil-gas injection part; 301-fuel injector; 302-air injector; DETAILED DESCRIPTION

[0018] The specific embodiment of the utility model is further described in detail in combination with the drawings.

[0019] For example, Figure 1As shown, the utility model provides a kind of air-assisted fuel injection system, it is mainly by compressed air part 10, fuel delivery part 20 and oil-gas injection part 30 composition;Compressed air part 10 includes air compressor 101, gas pipeline 102, oil-water separator 103 composition, air compressor 101 in operation continuously produces compressed gas, provides the compressed air of uninterrupted and certain pressure for oil-gas injection part 30;Fuel delivery part 20 includes fuel pump 201, fuel tank 205, fuel pipeline 202, check valve 203, filter 206, pressure regulator 204 and overflow valve 207, provides stable fuel for oil-gas injection part 30;Oil-gas injection part 30 includes fuel injector 301, air injector 302 and the shell (not shown) of bearing above-mentioned two injectors.

[0020] As Figure 1 Shown, oil-water separator 103 arrangement position follows air compressor 101 behind.Mainly used for filtering the water vapor in compressed air and obtains dry compressed air, avoids relevant shell / parts to be corroded, influences spare part service life.

[0021] Compressed air part 10 inside and fuel delivery part 20 and oil-gas injection part 30 mainly pass through gas pipeline 102 intercommunication.The compressed air generated by air compressor 101 reaches oil-gas injection part 30 and pressure regulator 204 after oil-water separator 103, realizes the supply of compressed air to oil-gas injection part 30 and provides a stable air pressure for pressure regulator 204.Optimally, compressed air can also only reach oil-gas injection part 30 and pressure regulator 204 in order after oil-water separator 103, in design, oil-gas injection part 30 and pressure regulator 204 can be used in parallel or in series.

[0022] As Figure 1 Shown, each component on fuel delivery part 20 is connected by fuel pipeline 202, and the main oil circuit is a self-return oil circuit controlled by a mechanical pressure regulator 204, and the fuel pump 201 is a flow-adjustable fuel pump, and the oil pressure of the oil circuit is adjusted by the compressed air pressure value and the fuel pump 201. A check valve 203 is arranged on the main oil circuit, and the conduction direction of the check valve 203 is from the fuel pump 201 to the oil-gas injection part 30. Optimally, the oil-gas injection part 30 and the pressure regulator 204 can be used in parallel or in series after the check valve 203.

[0023] Optimally, the fuel delivery part 20 is provided with a bypass circuit composed of an overflow valve 207, and the bypass circuit can effectively guide the excess fuel to the fuel tank 205 when the fuel pump 201 is overloaded, and the bypass circuit is arranged before the check valve 203.

[0024] Working principle:

[0025] like Figure 1 As shown, in this embodiment, the compressed air unit 10 starts working when the engine starts. The air compressor 101 continuously generates compressed air during operation and delivers it to the oil-water separator 103 via the gas pipeline 102. After being dried by the oil-water separator 103, the compressed air is delivered via the gas pipeline 102 to the air injector 302 in the fuel injection unit 30, waiting to mix with the fuel. At the same time, the dried compressed air arrives at the air end of the pressure regulator 204, establishing a stable air pressure for the pressure regulator 204. Simultaneously, the fuel delivery unit 20 starts working when the engine starts. Under the action of the fuel pump 201, fuel is pumped out from the fuel tank 205 and delivered to the filter 206 via the fuel pipeline 202 to remove particles and other impurities. Then, it enters the fuel delivery unit 202 via the fuel pipeline 202. Fuel is pressurized by fuel pump 201 and then delivered to one-way valve 203 via fuel line 202. After passing through one-way valve 203, fuel reaches the fuel end of pressure regulator 204 and fuel injector 301 on fuel injection unit 30. Pressure regulator 204 is a preset pressure mechanical regulator. When the pressure difference between air end and fuel end in pressure regulator 204 reaches a specified value, fuel return switch in pressure regulator 204 is opened. Fuel flows out of fuel end in pressure regulator 204 through return switch and is connected through fuel line 202 to finally return to fuel tank 205, thus completing the self-returning fuel circuit. At the same time, a stable fuel pressure is established between one-way valve 203, pressure regulator 204 and fuel injector 301 to prepare for stable fuel injection by fuel injector 301. Fuel pump 201 is an adjustable electronic fuel pump. In actual operation, the engine electronic control unit (ECU, not shown) issues control commands to fuel pump 201 to adjust its speed according to engine operating conditions and the return fuel capacity of pressure regulator 204. This ensures that the fuel flow rate is controlled within the range of engine fuel consumption and pressure regulator 204 return fuel, thereby guaranteeing the stable operation of the fuel supply system and the engine. The one-way valve 203 in the fuel circuit is mainly used to prevent fuel loss from the fuel line 202 after fuel pump 201 stops working, thus preventing a drop in fuel pressure and facilitating rapid fuel pressure establishment when the engine restarts. Meanwhile, in order to prevent the fuel pump 201 from overloading under extreme conditions, which would cause the fuel pressure in the fuel line 202 to exceed the set pressure, and to reduce the failure rate of oil pressure leakage in the fuel line after the check valve, a bypass circuit consisting of an overflow valve 207 is set up. The bypass circuit is set after the fuel pump 201 and before the check valve 203. When the fuel pump 201 is overloaded, it can effectively guide excess fuel directly back into the fuel tank 205, ensuring the stability of the oil pressure in the fuel line 202 after the check valve 203.

[0026] After the engine speed reaches the specified speed, the oil and gas injection part 30 first receives the instruction of the engine electronic control unit ECU (not shown) to inject a certain amount of fuel into the cavity above the air injector 302 according to the instruction, and mix with the dry compressed air delivered by the compressed air part 10 to form an oil and gas mixture; then the air injector 302 receives the instruction of the engine electronic control unit ECU (not shown) to start working to spray the oil and gas mixture above into the engine combustion chamber, and then complete the final atomization of the fuel.

[0027] The above specific exemplary embodiments of the present application are for the purpose of illustration and example, but the present application is not limited to these embodiments, any improvement or replacement within the basic spirit of the present application still belongs to the scope of protection claimed by the present application.

Claims

1. An air-assisted fuel injection system characterized by The application relates to a fuel-oil injection device, which comprises a compressed air part (10), a fuel delivery part (20) and an oil-gas injection part (30); the compressed air part (10) comprises an air compressor (101), a gas pipeline (102) and an oil-water separator (103); the air compressor (101) continuously generates compressed air during operation, and provides uninterrupted compressed air with a certain pressure for the oil-gas injection part (30); the fuel delivery part (20) comprises a fuel pump (201), a fuel tank (205), a fuel pipeline (202), a one-way valve (203), a filter (206), a pressure regulator (204) and an overflow valve (207), and provides stable fuel for the oil-gas injection part (30); the oil-gas injection part (30) comprises a fuel injector (301), an air injector (302) and a shell bearing the two injectors.

2. An air-assisted fuel injection system as claimed in claim 1, wherein The oil-water separator (103) is arranged immediately behind the air compressor (101).

3. An air-assisted fuel injection system as claimed in claim 1, wherein After passing through the oil-water separator (103), the compressed air can be distributed to the oil-gas injection part (30) and the pressure regulator (204) through two paths, or can be distributed to the oil-gas injection part (30) and the pressure regulator (204) through one path in sequence; the oil-gas injection part (30) and the pressure regulator (204) can be used in parallel or in series.

4. An air-assisted fuel injection system as defined in claim 1, wherein The fuel delivery part (20) is designed as a self-oil-return type oil circuit, and is controlled through the pressure regulator (204); the pressure regulator (204) is a mechanical pressure regulator; the fuel pump (201) is a flow-adjustable fuel pump; and the oil pressure of the oil circuit is jointly adjusted by the compressed air pressure value and the fuel pump (201).

5. An air-assisted fuel injection system as defined in claim 1, wherein The fuel delivery part (20) is further provided with the one-way valve (203), and the one-way valve (203) is in a conduction direction from the fuel pump (201) to the oil-gas injection part (30).

6. An air-assisted fuel injection system as defined in claim 1, wherein The fuel delivery part (20) is provided with a bypass circuit composed of the overflow valve (207), and the bypass circuit can effectively guide the excess fuel to the fuel tank (205) directly when the fuel pump (201) works under overload; and the bypass circuit is arranged before the one-way valve (203).

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