Air supply structure for air-assisted injection system

Abstract

This utility model discloses an air supply structure for an air-assisted injection system, including a structural body mounted on the cylinder head. The structural body includes a premixing chamber, an air supply pipe, and a check valve. The premixing chamber is located inside the structural body. The air supply pipe is mounted on the structural body and communicates with the premixing chamber. The check valve is located in the channel between the premixing chamber and the air supply pipe. When the air pressure in the air supply pipe reaches the opening pressure of the check valve, the check valve opens, and air enters the premixing chamber through the check valve. The air-fuel mixture in the premixing chamber cannot enter the air supply pipe through the check valve. This air supply structure of the air-assisted injection system effectively prevents the backflow of the air-fuel mixture in the premixing chamber into the air supply pipe and air pump by adding a check valve between the air supply pipe and the premixing chamber, thus avoiding the problem of reduced fuel injected into the cylinder and the impact on engine performance and fuel consumption.

Description

Technical Field

[0001] This utility model relates to the field of engine design and manufacturing, and in particular to an air supply structure for an air-assisted injection system. Background Technology

[0002] Air-assisted injection (AFI) is a novel fuel injection system that, at relatively low fuel pressure, utilizes gas-liquid two-phase cavitation to atomize fuel at high speed into extremely fine droplets, which then rapidly evaporate, achieving excellent heavy fuel atomization. Its superior heavy fuel atomization capability and lightweight characteristics have led to its widespread application in heavy fuel engines for small and medium-sized unmanned aerial vehicles (UAVs). AFI is characterized by consisting of a fuel nozzle and an air-assisted direct injection nozzle. The fuel nozzle's injection pressure is provided by a fuel pump, while the air-assisted nozzle's injection pressure is provided by an air pump.

[0003] Currently, in air-assisted injection systems, the fuel-air mixture in the premixing chamber flows back into the air pipe and air pump, resulting in a reduction in the fuel injected into the cylinder, which affects engine performance and fuel consumption.

[0004] The aforementioned problems in existing technologies have become one of the key issues that need to be addressed in the field of heavy oil engines for small and medium-sized unmanned aerial vehicles.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0006] The purpose of this utility model is to provide an air supply structure for an air-assisted injection system. By adding a check valve between the air supply pipe and the premixing chamber, it can effectively prevent the oil-air mixture in the premixing chamber from flowing back into the air supply pipe and air pump, thus avoiding the problem of reduced fuel injected into the cylinder and affecting engine performance and fuel consumption.

[0007] To achieve the above objectives, this utility model provides an air supply structure for an air-assisted injection system, including a structural body mounted on the cylinder head. The structural body includes a premixing chamber, an air supply pipe, and a check valve. The premixing chamber is located inside the structural body. The air supply pipe is mounted on the structural body and is connected to the premixing chamber. The check valve is located in the channel between the premixing chamber and the air supply pipe. When the air pressure in the air supply pipe reaches the opening pressure of the check valve, the check valve opens, and air enters the premixing chamber through the check valve. The air mixture in the premixing chamber cannot enter the air supply pipe through the check valve.

[0008] In a preferred embodiment, the check valve includes an air inlet, an air outlet, a valve body, and a spring 52; the air inlet is located on the side of the check valve near the air supply pipe; the air outlet is located on the side of the check valve near the premixing chamber; the valve body is located on the side of the check valve near the air inlet; the spring is located between the air outlet and the valve body; wherein the valve body relies on the tension of the spring to push against and block the air inlet, and the check valve opens when the pressure in the air supply pipe is sufficient to overcome the pressure of the spring.

[0009] In a preferred embodiment, the air supply structure of the air-assisted injection system further includes an air pump for pressurizing the air supplied to the air supply pipe.

[0010] In a preferred embodiment, the air supply structure of the air-assisted injection system further includes an air rail, which is disposed on the structure body, and the air supply pipe supplies air to the premixing chamber through the air rail.

[0011] In a preferred embodiment, the air supply structure of the air-assisted injection system further includes an air-assisted nozzle, which is disposed in the premixing chamber. High-pressure air pressurized by the air pump passes through the air supply pipe and the air rail and is injected into the premixing chamber from the air-assisted nozzle.

[0012] In a preferred embodiment, the structural body further includes a connecting flange and a connecting hole; the connecting flange is disposed at the connection surface between the structural body and the cylinder head; the connecting hole is disposed at the edge of the connecting flange and is used to connect the structural body and the cylinder head by bolts.

[0013] Compared with the prior art, the air supply structure of the air-assisted injection system of this utility model has the following beneficial effects: By setting a check valve on the channel from the premixing chamber to the air supply pipe, when the air pressure in the air supply pipe is greater than the opening pressure of the check valve, the check valve opens, and high-pressure air enters the premixing chamber through the check valve. Conversely, the air-fuel mixture in the premixing chamber cannot flow back into the air supply pipe through the check valve. In this way, the backflow of the oil-air mixture in the premixing chamber into the air supply pipe and air pump is effectively prevented, thus avoiding the problem of reduced fuel injected into the cylinder and the impact on engine performance and fuel consumption. Attached Figure Description

[0014] Figure 1 This is a front view schematic diagram of the air supply structure installed on the cylinder head according to an embodiment of the present utility model;

[0015] Figure 2 This is a top view schematic diagram of the gas supply structure according to an embodiment of the present utility model;

[0016] Figure 3 yes Figure 2 A schematic diagram of the cross-sectional structure at point D-D;

[0017] Figure 4This is a cross-sectional structural schematic diagram of the structural body according to one embodiment of the present invention from another perspective.

[0018] Explanation of key figure labels:

[0019] 1-Air supply pipe, 2-Air rail, 3-Cylinder head, 4-Air auxiliary nozzle, 5-Check valve, 51-Valve body, 52-Spring, 6-Connecting flange, 7-Connecting hole, 8-Premix chamber, 9-Fuel passage. Detailed Implementation

[0020] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, it should be understood that the scope of protection of this utility model is not limited to the specific embodiments.

[0021] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0022] like Figures 1 to 3 As shown, according to a preferred embodiment of the present invention, an air supply structure for an air-assisted injection system includes a structural body disposed on a cylinder head 3. The structural body includes a premixing chamber 8, an air supply pipe 1, and a check valve 5. The premixing chamber 8 is disposed inside the structural body. The air supply pipe 1 is disposed on the structural body and is connected to the premixing chamber 8. The check valve 5 is disposed in the channel between the premixing chamber 8 and the air supply pipe 1. When the air pressure in the air supply pipe 1 reaches the opening pressure of the check valve 5, the check valve 5 opens, and air enters the premixing chamber 8 through the check valve 5. The air-fuel mixture in the premixing chamber 8 cannot enter the air supply pipe 1 through the check valve 5.

[0023] In some embodiments, the check valve 5 includes an air inlet, an air outlet, a valve body 51, and a spring 52; the air inlet is located on the side of the check valve 5 near the air supply pipe 1; the air outlet is located on the side of the check valve 5 near the premixing chamber 8; the valve body 51 is located on the side of the check valve 5 near the air inlet; the spring 52 is located between the air outlet and the valve body 51; wherein the valve body 51 is pressed against and blocked by the tension of the spring 52 to block the air inlet. When the pressure in the air supply pipe 1 is sufficient to overcome the pressure of the spring 52, the check valve 5 opens. However, the check valve 5 cannot reverse the flow of air from the air outlet to the air inlet.

[0024] In some embodiments, the air supply structure of the air-assisted injection system also includes an air pump (not shown) for pressurizing the air supplied to the air supply pipe 1.

[0025] In some embodiments, the air supply structure of the air-assisted injection system also includes an air rail 2, which is disposed on the structure body, and the air supply pipe 1 supplies air to the premixing chamber 8 through the air rail 2.

[0026] In some embodiments, the air supply structure of the air-assisted injection system also includes an air-assisted nozzle 4, which is disposed in the premixing chamber 8. High-pressure air pressurized by the air pump passes through the air supply pipe 1 and the air rail 2 and is injected into the premixing chamber 8 from the air-assisted nozzle 4.

[0027] In some embodiments, the structural body further includes a connecting flange 6 and a connecting hole 7; the connecting flange 6 is disposed at the connection surface between the structural body and the cylinder head 3; the connecting hole 7 is disposed at the edge of the connecting flange 6, and the connecting hole 7 is used to connect the structural body and the cylinder head 3 by bolts.

[0028] like Figure 4 As shown, in some embodiments, the air supply structure of the air-assisted injection system also includes a fuel passage 9, which is also located in the main body of the structure. The fuel passage 9 is connected to the premixing chamber 8, and the fuel enters the premixing chamber 8 through the fuel passage 9 and mixes with the air entering the premixing chamber 8 to form a mixture.

[0029] In summary, the air supply structure of the air-assisted injection system of this utility model has the following beneficial effects: By installing a check valve on the channel from the premixing chamber to the air supply pipe, when the air pressure in the air supply pipe is greater than the opening pressure of the check valve, the check valve opens, and high-pressure air enters the premixing chamber through the check valve. Conversely, the air-fuel mixture in the premixing chamber cannot flow back into the air supply pipe through the check valve. In this way, the backflow of the air-fuel mixture in the premixing chamber into the air supply pipe and air pump is effectively prevented, thus avoiding the problem of reduced fuel injected into the cylinder and the impact on engine performance and fuel consumption.

[0030] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the present invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the present invention, as well as various different choices and variations. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. An air supply structure of an air-assisted injection system, characterized by, include: A structural body, which is disposed on the cylinder head, includes: A premixing chamber is disposed inside the main body of the structure; An air supply pipe is disposed on the structural body and communicates with the premixing chamber; and A check valve is disposed in the passage between the premixing chamber and the air supply pipe; When the air pressure in the air supply pipe reaches the opening pressure of the check valve, the check valve opens, and air enters the premixing chamber through the check valve. The mixed air in the premixing chamber cannot enter the air supply pipe through the check valve.

2. The air supply structure of the air-assisted injection system according to claim 1, wherein The check valve includes: An air inlet is located on the side of the check valve near the air supply pipe; An air outlet is located on the side of the check valve adjacent to the premixing chamber; A valve body, which is disposed on the side of the check valve adjacent to the air inlet; and A spring is disposed between the air outlet and the valve body; The valve body relies on the tension of the spring to press against and block the air inlet. When the pressure in the air supply pipe is sufficient to overcome the pressure of the spring, the check valve opens.

3. The air supply structure of the air-assisted injection system according to claim 1, wherein It also includes an air pump, which is used to pressurize the air supplied into the air supply pipe.

4. The air supply structure of the air-assisted injection system according to claim 3, wherein It also includes an air rail, which is disposed on the structure body, and the air supply pipe supplies air to the premixing chamber through the air rail.

5. The air supply structure of the air-assisted injection system according to claim 4, wherein It also includes an air-assisted nozzle, which is disposed in the premixing chamber. High-pressure air, pressurized by the air pump, is injected into the premixing chamber through the air-assisted nozzle after passing through the air supply pipe and the air rail.

6. The air supply structure of the air-assisted injection system according to claim 1, wherein The structural body also includes: A connecting flange is provided at the connection surface between the structural body and the cylinder head; A connection hole is provided at the edge of the connection flange, the connection hole being used to connect the structural body to the cylinder head by bolts.

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