Engine air guide structure

Abstract

The utility model relates to the technical field of engine discloses an engine air -guide structure, including engine cylinder, air -guide cover and multilayer fin, the air -guide cover between engine cylinder is formed cooling air -duct by the fin, its characterized in that, the fin is fixed with the air -guide board, the air -guide board forms the inner air -duct between engine cylinder, the air -guide board forms the outer air -duct between air -guide cover. Have the advantage that the heat dissipation effect is good.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, specifically to an engine air guide structure. Background Technology

[0002] In engine cooling technology, air cooling is a classic approach that runs parallel to liquid cooling. It directly utilizes air as the cooling medium to remove heat. The structure of an air-cooled system revolves around a core objective: maximizing the surface area in contact with air for heat dissipation and efficiently guiding airflow across these surfaces. Its main components include radiator fins and a shroud. The enormous heat generated by engine combustion is first conducted through the cylinder walls and cylinder head to the radiator fins on the outer wall. Cooling air generated by the fan rotation or vehicle movement, guided by the shroud, flows at a certain speed and direction across the surface of the radiator fins to remove the engine's heat.

[0003] Chinese patent document CN222650070U discloses an air-cooled engine body, including a base and a housing. The bottom surface of the base has a downwardly extending air guide plate mounting hole for mounting an air guide plate. The lower end of the air guide plate mounting hole extends to the bottom of the base, and the base and the air guide plate form a cooling air duct. The lower end of the side of the housing has a lower ventilation hole, which communicates with the cooling air duct.

[0004] For example, Chinese patent document CN201041089Y discloses a general-purpose gasoline engine crankcase, including a crankcase and a cylinder block integrated with the crankcase. Air guide vanes are provided on the upper and lower sides of the cylinder block, and the air guide vanes are integrated with the heat sinks on the upper and lower sides of the crankcase and cylinder block, forming a cooling air passage between the air guide vanes and the cylinder block and its heat sinks. After this crankcase is installed on a gasoline engine, it allows the cool air generated by the gasoline engine fan impeller to be concentrated and flow out from the cooling air passage of the crankcase.

[0005] In existing technology, the cooling air duct between the air guide plate and the cylinder block dissipates heat from the heat sink. However, if the air duct is designed to be wide, the air velocity will be low and it will take up too much space. If the air duct is designed to be narrow, the contact area between the cold air and the heat sink will be reduced. Therefore, the cooling effect of both methods is not ideal. Utility Model Content

[0006] To address the technical problem of improving engine cooling performance, this utility model provides an engine airflow structure, including an engine block, an airflow shroud, and multiple layers of heat sinks. A cooling airflow channel is formed between the airflow shroud and the engine block by the heat sinks. The key feature is that an airflow guide plate is fixed on the heat sink, forming an inner airflow channel between the airflow guide plate and the engine block, and an outer airflow channel between the airflow guide plate and the airflow shroud.

[0007] To improve heat dissipation, the cross-sectional area of ​​the inner air duct is larger than that of the outer air duct.

[0008] Furthermore, the air guide plate includes an air guide section and a bending section. The air guide section faces the air inlet side, and the bending section bends toward the air guide cover to impede the wind speed of the external air duct.

[0009] To facilitate the distribution and installation of cold air, the air guide plate is provided with strip-shaped holes that fit the heat sink, and the heat sink extends outward through the strip-shaped holes.

[0010] Preferably, the air guide plate and the heat sink are fitted with a gap, and the residual air leaking out from the gap continues to carry away the engine heat.

[0011] Preferably, the engine block is a twin-cylinder engine block, and the air guide vanes are symmetrically arranged on the left and right cylinder blocks.

[0012] This utility model has the following beneficial effects: This invention divides the cooling airflow between the engine block and the air shroud into inner and outer airflow channels using a guide vane. The outer airflow channel has a smaller airflow volume than the inner airflow channel, accelerating the flow velocity in the inner airflow channel while simultaneously contributing to heat dissipation. This partitioned design allows for more precise guidance and distribution of cooling airflow. Since the inner airflow channel directly surrounds the engine block, the core heat source, its cross-sectional area is designed to be larger than that of the outer airflow channel. According to fluid mechanics principles, with a fixed total airflow, a narrower channel means a higher flow velocity. Therefore, the narrow structure of the outer airflow channel accelerates the airflow in that area, enhancing the forced convection effect; while the inner airflow channel, maintaining a larger cross-sectional area to ensure sufficient airflow, also achieves stable airflow due to the overall system's airflow guidance. The inner and outer airflow channels work together to flush the heat sink fins, achieving targeted cooling of the engine's high-heat areas and full utilization of the overall heat dissipation area, thereby significantly improving the system's overall heat dissipation efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the air guide structure of the engine of this utility model; Figure 2 This is a schematic diagram of the internal structure of the engine air guide structure of this utility model; Figure 3 This is a schematic diagram of the cooling air duct. Detailed Implementation

[0014] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: engine block 1, air guide cover 2, heat sink 3, air guide plate 4, air guide part 401, bend part 402, inner air duct 5, outer air duct 6, strip hole 7, air intake side 8, cooling air duct 9.

[0015] Example 1 like Figure 1-3 As shown, an engine air guide structure includes an engine cylinder block 1, an air guide cover 2, and multi-layer heat sinks 3. The air guide cover 2 and the engine cylinder block 1 are connected by the heat sinks 3 to form a cooling air duct 9. An air guide plate 4 is fixed on the heat sink 3 by bolts. An inner air duct 5 is formed between the air guide plate 4 and the engine cylinder block 1, and an outer air duct 6 is formed between the air guide plate 4 and the air guide cover 2.

[0016] The cross-sectional area of ​​the inner air duct 5 is larger than that of the outer air duct 6.

[0017] The air guide plate 4 includes an air guide section 401 and a bending section 402. The air guide section 401 faces the air inlet side 8, and the bending section 402 bends toward the air guide cover 2 to impede the wind speed of the external air duct 6.

[0018] The air guide plate 4 has strip-shaped holes 7 that fit with the heat sink 3, and the heat sink 3 extends outward through the strip-shaped holes 7. Without increasing the overall volume, a leap in heat dissipation performance is achieved. This structure organically integrates the air guide plate 4, the heat sink 3, the engine block 1, and the air guide cover 2 into a single unit, resulting in a compact structure and extremely high space utilization. It avoids the problem of bulky engine assembly caused by simply increasing the size of the air duct in pursuit of better heat dissipation, making it highly suitable for applications with strict space requirements (such as general-purpose gasoline engines).

[0019] The air guide plate 4 and the heat sink 3 are fitted with a gap, and the residual air leaking out from the gap continues to carry away the engine heat.

[0020] The engine block 1 is a twin-cylinder engine block 1, and the air guide plate 4 is symmetrically arranged on the left and right cylinder blocks.

[0021] 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. Therefore, 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 modifications and improvements 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 airflow guiding structure, comprising an engine block, an airflow guide cover, and multiple layers of heat sinks, wherein a cooling airflow channel is formed between the airflow guide cover and the engine block by the heat sinks, characterized in that, An air guide plate is fixed on the heat sink, forming an inner air duct between the air guide plate and the engine cylinder block, and forming an outer air duct between the air guide plate and the air guide cover.

2. The engine air guide structure according to claim 1, characterized in that: The cross-sectional area of ​​the inner air duct is larger than that of the outer air duct.

3. The engine air guide structure according to claim 2, characterized in that: The air guide plate includes an air guide section and a bending section. The air guide section faces the air inlet side, and the bending section bends towards the air guide cover.

4. The engine air guide structure according to claim 3, characterized in that: The air guide plate has strip-shaped holes that fit the heat sink, and the heat sink extends outward through the strip-shaped holes.

5. The engine air guide structure according to claim 4, characterized in that: The air guide plate and the heat sink are fitted with a clearance.

6. The engine air guide structure according to claim 5, characterized in that: The engine block is a twin-cylinder engine block, and the air guides are symmetrically arranged on the left and right cylinder blocks.

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