An engine air intake system

Abstract

The utility model relates to the technical field of engine, disclose an engine air intake system, including oil gas mixing device, air intake pipe, resonant cavity and air cleaner, air intake pipe both sides are connected oil gas mixing device and air cleaner, air intake pipe has the lug of connecting resonant cavity, its characterized in that: air intake pipe is sectional structure, and each section air intake pipe includes at least one bending point. The problem that traditional multi-bending point special-shaped pipe forming process is complex, stripping is difficult is solved, and assembly difficulty is reduced greatly, especially suitable for the whole machine environment of limited space.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, specifically to an engine intake system. Background Technology

[0002] The engine intake system is one of the core auxiliary systems of the engine. Its core function is to provide clean, dry, and sufficiently flowing air to the engine combustion chamber, allowing it to mix thoroughly with fuel and participate in the combustion reaction. This directly affects the engine's power output, fuel economy, and exhaust emission performance. Due to limitations in engine compartment space and interference from surrounding components, the intake system's piping needs to adapt to complex installation environments within the overall engine layout. It typically requires a uniquely shaped structure with multiple bends to achieve precise connection with components such as the air-fuel mixture generator and air filter.

[0003] Chinese patent CN221169740U discloses an engine and a generator, including an oil-gas mixing device, an air filter, an air guide housing for horizontal airflow, a vent pipe connecting the air filter and the oil-gas mixing device, and a resonant cavity connected to the vent pipe. The air filter, the oil-gas mixing device, and the resonant cavity are all located to the side of the air guide housing, and the oil-gas mixing device and the resonant cavity are located above the air filter. The vent pipe is a flexible vent pipe, and the resonant cavity is connected to the reverse node of the vent pipe. The resonant cavity is provided with a group of fixed lugs with mutually perpendicular connection directions.

[0004] The existing technology has the following shortcomings: the vent pipe, also known as the air inlet pipe, has multiple bending points designed on the pipe body due to its irregular structure in order to meet the requirements of installation in a limited space. However, such irregular vent pipes not only have poor molding processability and are difficult to demold, but are also inconvenient to install. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides an engine intake system, including an oil-air mixing device, an intake pipe, a resonant cavity, and an air filter. The oil-air mixing device and the air filter are respectively connected to both sides of the intake pipe. The intake pipe has lugs for connecting to the resonant cavity. The characteristic of this utility model is that the intake pipe has a segmented structure, and each segment of the intake pipe includes at least one bend.

[0006] Preferably, the intake pipe has a two-section structure, and the two sections of the intake pipe are fixedly connected by fasteners.

[0007] To improve versatility, the connection between the two intake pipe sections is located on a straight pipe.

[0008] To accommodate special piping and facilitate demolding of both intake pipe sections, the connection point of the two intake pipe sections is located at the bend point.

[0009] To improve the manufacturing economy of the intake pipe while meeting the requirements of high oil and high temperature environments, the two sections of the intake pipe are made of different materials. The intake pipe closer to the oil-gas mixing device is preferably made of NBR rubber material, which is oil-resistant and temperature-resistant, while the intake pipe further away from the oil-gas mixing device is made of PVC plastic material.

[0010] To prevent deformation at the intake pipe connection, the fastener includes a connector and a clamp. The connector is fitted onto the connection between the two sections of the intake pipe, and the connector is secured by the clamp.

[0011] Preferably, the lug is disposed on any section of the intake pipe, and the resonant cavity is connected to the lug.

[0012] To facilitate installation and manufacturing, the resonant cavity is composed of an upper cover and a lower cover. The split design simplifies the manufacturing process and eliminates the need for complex blow molding.

[0013] Furthermore, the lower cover of the resonant cavity is integrally formed with the air guide or air filter, and can be integrally formed with other components to reduce production costs. Moreover, the space on other components can be used to reduce the assembly space required for the split resonant cavity, thereby maximizing the volume of the resonant cavity while achieving compactness.

[0014] To ensure the airtightness of the resonant cavity, a sealing element is provided between the upper cover and the lower cover.

[0015] To make the internal structure of the engine more compact, the resonant cavity is set on the engine's air shroud, located on the side of the air filter and the oil-air mixing device.

[0016] This utility model has the following beneficial effects: 1. This utility model disassembles the traditional one-piece molded irregular-shaped intake pipe into a segmented structure, with each segment containing only a few bending points. This completely solves the problems of complex molding process and difficult demolding of traditional irregular-shaped pipes with multiple bending points. It can be produced using simpler injection molding, blow molding and other processes, which significantly improves production efficiency and reduces scrap rate. At the same time, the segmented structure is easy to transport separately and splice on site. It can flexibly adapt to the compact layout of the engine. During installation, the docking angle of each pipe segment can be adjusted as needed, which greatly reduces the assembly difficulty. It is especially suitable for the whole machine environment with limited space. 2. The intake pipe connection can be located on a straight section or a bend point according to actual needs, adapting to different pipeline design requirements: when the connection is located on a straight section, the versatility of each pipeline section is stronger, which facilitates mass production and subsequent maintenance and replacement, and reduces spare parts costs; when the connection is located on a bend point, the structural complexity of a single pipeline section can be further simplified, ensuring that each pipeline section can be demolded smoothly, while ensuring the overall pipeline's adaptability to irregular shapes, expanding the range of applicable models for the intake system. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an embodiment of the engine intake system of this utility model; Figure 2 This is a schematic diagram of the air intake pipe; Figure 3 This is a schematic diagram of the intake pipe connection. Figure 4 This is a schematic diagram of the resonant cavity and the air guide shroud. Detailed Implementation

[0018] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: 1. Oil-gas mixing device; 2. Inlet pipe; 201. Upper inlet pipe; 202. Lower inlet pipe; 3. Resonant cavity; 301. Upper cover; 302. Lower cover; 4. Air filter; 5. Support lug; 6. Bend point; 7. Groove; 8. Protrusion; 9. Straight pipe; 10. Connecting ring; 11. Clamp; 12. Air guide shroud; 13. Sealing strip.

[0019] Example 1 like Figure 1-4 As shown, an engine intake system includes an air-fuel mixing device 1, an intake pipe 2, a resonant cavity 3, and an air filter 4. The air-fuel mixing device 1 and the air filter 4 are connected to both sides of the intake pipe 2, respectively. The intake pipe 2 has lugs 5 for connecting to the resonant cavity 3. The intake pipe 2 has a segmented structure, including an upper intake pipe 201 and a lower intake pipe 202. The upper intake pipe 201 has one bend point 6, and the lower intake pipe 202 has two bend points 6.

[0020] The connecting end faces of the upper air intake pipe 201 and the lower air intake pipe 202 are provided with a plurality of grooves 7 and protrusions 8 that cooperate with each other. The connection between the upper air intake pipe 201 and the lower air intake pipe 202 is fixedly connected by fasteners.

[0021] The connection between the upper intake pipe 201 and the lower intake pipe 202 is located on the straight pipe 9. Depending on actual needs, the connection between the two sections of the intake pipe 2 can be located at the bend point 6.

[0022] To improve the manufacturing economy of the intake pipe while meeting the requirements of high oil and high temperature environments, the two sections of the intake pipe are made of different materials. The intake pipe on the side closer to the oil-gas mixing device is made of oil-resistant and temperature-resistant rubber material, mainly NBR, while the intake pipe on the side farther away from the oil-gas mixing device is made of plastic material, mainly PVC.

[0023] The fastener includes a connecting ring 10 and a clamp 11. The connecting ring 10 is sleeved at the connection between the upper air intake pipe 201 and the lower air intake pipe 202, and the connecting ring 10 is fastened by the clamp 11.

[0024] The lug 5 is mounted on the lower air intake pipe 202, and the resonant cavity 3 is connected to the lug 5.

[0025] The resonant cavity 3 is composed of an upper cover 301 and a lower cover 302, which are connected by screws. The split design makes the process simpler and eliminates the need for a complex blow molding process.

[0026] The lower cover 302 of the resonant cavity 3 is integrally formed with the air guide shroud 12, and can be integrally formed with other components, reducing production costs. Furthermore, the space on other components can be used to reduce the assembly space required for the split resonant cavity 3, thereby maximizing the volume of the resonant cavity 3 while achieving compactness.

[0027] A sealing strip 13 is provided between the upper cover 301 and the lower cover 302 for sealing.

[0028] The resonant cavity 3 is mounted on the engine's air shroud 12, located on the side of the air filter 4 and the oil-gas mixing device 1. This design makes efficient use of space, resulting in a more compact structure.

[0029] The above descriptions are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are knowledgeable of all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in conjunction with their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An engine intake system, comprising an air-fuel mixing device, an intake pipe, a resonant cavity, and an air filter, wherein the air-fuel mixing device and the air filter are respectively connected to both sides of the intake pipe, and the intake pipe has lugs for connecting to the resonant cavity, characterized in that: The intake pipe has a segmented structure, and each segment of the intake pipe includes at least one bend.

2. The engine intake system according to claim 1, characterized in that: The intake pipe has a two-section structure, and the two sections of the intake pipe are fixedly connected by fasteners.

3. The engine intake system according to claim 2, characterized in that: The connection between the two intake pipe sections is located on a straight pipe.

4. The engine intake system according to claim 2, characterized in that: The connection between the two sections of the intake pipe is located at the bend.

5. The engine intake system according to claim 3 or 4, characterized in that: The fastener includes a connector and a clamp. The connector is fitted at the connection between the two sections of the air intake pipe, and the connector is fastened by the clamp.

6. The engine intake system according to claim 5, characterized in that: The lug is mounted on any section of the intake pipe, and the resonant cavity is connected to the lug.

7. The engine intake system according to claim 6, characterized in that: The resonant cavity consists of an upper cover and a lower cover.

8. The engine intake system according to claim 7, characterized in that: The lower cover of the resonant cavity is integrally formed with the air guide or air filter.

9. The engine intake system according to claim 8, characterized in that: A sealing element is provided between the upper cover and the lower cover.

10. The engine intake system according to claim 9, characterized in that: The resonant cavity is mounted on the engine's air shroud, located on the side of the air filter and the oil-gas mixing device.

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