An eccentric shaft for an air-cooled rotary engine

Abstract

This utility model relates to an eccentric shaft for a rotary engine based on air cooling, comprising a shaft body and a centrifugal fan. A first channel is formed along the axial direction at the center of the shaft body, and a second channel is formed radially near one end of the shaft body, connecting the second channel to the first channel. The centrifugal fan includes a base plate sleeved and fixed to the shaft body. The base plate is a circular plate structure with a central hole, the size of which matches the outer diameter of the shaft body. Several impellers are evenly fixed on the base plate, radiating outwards from the axial direction, and located around the second channel. The first channel, the second channel, and the air outlet form a flow path for cooling air. The cooling air in the first and second channels flows due to the rotation of the impellers, achieving forced air cooling of the eccentric shaft. Forced air cooling, due to its higher airflow rate, can remove more heat, thus solving part of the heat dissipation problem of the eccentric shaft in a rotary engine.

Description

Technical Field

[0001] This utility model belongs to the field of engine technology, specifically relating to an eccentric shaft for an air-cooled rotary engine. Background Technology

[0002] A rotary engine is a common type of internal combustion engine, consisting of a rotor and a housing. The rotor is the core component of the engine, responsible for compressing and burning the air-fuel mixture. During the operation of a rotary engine, the eccentric shaft generates a significant amount of heat due to the high temperature and high-speed rotation. To ensure normal engine operation and prevent malfunctions, the eccentric shaft needs to be cooled. Cooling reduces its temperature, prevents material fatigue and deformation caused by high temperatures, and reduces the impact of thermal stress on the rotor, thus helping to extend the engine's lifespan and improve its performance.

[0003] Currently, in the field of rotary engines, the cooling solutions for eccentric shafts are mainly oil cooling and coolant cooling, with a small number of designs employing partial air cooling structures. Oil cooling is limited by oil flow rate and specific heat capacity, resulting in poor cooling performance; while coolant cooling requires additional design and equipment, leading to a more complex overall structure, which is not conducive to the reliability of eccentric shaft operation. Some air-cooled eccentric shafts dissipate heat by machining ventilation holes in the journal, but due to the structural limitations of the eccentric shaft, the number of ventilation holes is often limited, the total inner area of ​​the ventilation holes through which cooling air flows is small, and the airflow cross-sectional area is also small, making it difficult to effectively remove heat, which may lead to insufficient heat dissipation of the eccentric shaft. Utility Model Content

[0004] The purpose of this utility model is to solve the above-mentioned problems. This application proposes an eccentric shaft for a rotary engine based on air cooling. A first channel and a second channel are provided in the shaft body, which are connected axially and radially. An air outlet is provided on the outer side of the centrifugal fan housing. The first channel, the second channel and the air outlet form a flow path for cooling air to achieve a cooling effect.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an eccentric shaft for a rotary engine based on air cooling, comprising a shaft body and a centrifugal fan, wherein a first channel is provided along the axial direction at the center of the shaft body, and a second channel is provided radially at one end of the shaft body near the port, the second channel being connected to the first channel;

[0006] The centrifugal fan includes a base plate fitted and fixed on the shaft. The base plate is a circular plate structure with a hole in the middle. The size of the hole is adapted to the outer diameter of the shaft. Several impellers are evenly fixed on the base plate, spreading outward along the axis. The impellers are located on the periphery of the second channel.

[0007] Furthermore: the base plate is fixedly connected to the counterweight by screws, and the counterweight and the shaft are provided with sliding grooves, and a flat key is provided in the sliding groove. The counterweight and the shaft are driven by the flat key.

[0008] Furthermore: the impeller is provided with a shell that encloses it, the shell is fixed to the base plate, and an air outlet is provided on one side of the shell. The first channel, the second channel, and the air outlet together form the flow path of cooling air.

[0009] Furthermore, the first channel and the second channel are cylindrical, and the diameter ratio of the first channel to the second channel is 1.5:1 to 3:1.

[0010] Furthermore, the first channel is conical at the opening end of the shaft.

[0011] Furthermore, the edge of the base plate is flush with the outer side of the impeller.

[0012] Furthermore, the base plate has six impellers.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] This invention achieves forced air cooling of the eccentric shaft by cooperating with the first and second channels located at the center and end of the eccentric shaft body and the air outlet on one side of the centrifugal fan housing, thus solving the heat dissipation problem of the eccentric shaft in a rotary engine. The first channel, the second channel, and the air outlet together form the flow path for cooling air, guiding the cooling air to the air outlet and further enhancing the heat dissipation effect. The shape and proportion of the first and second channels have also been carefully optimized to generate appropriate pressure and velocity of the cooling air within the channels, thereby effectively reducing the temperature of the rotary engine and improving its heat dissipation performance.

[0015] The centrifugal fan is equipped with a counterweight, which can keep the rotor engine balanced and stable while running at high speed. Compared with oil cooling and coolant cooling technologies, this invention has a simpler structure, is easier to operate, and has lower maintenance costs. Moreover, the use of this eccentric shaft in the rotor engine can improve the performance and reliability of the rotor engine and extend its service life, thus having high technical and economic value. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only for more clearly illustrating the technical solutions in the embodiments of this utility model or the prior art. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a cross-sectional view of the overall structure of this utility model;

[0018] Figure 2 This is a cross-sectional view of the eccentric shaft structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the installation structure of the centrifugal fan impeller of this utility model;

[0020] Figure 4 This is a schematic diagram of the overall structure of the outer shell of this utility model;

[0021] In the diagram: 1-shaft, 2-centrifugal fan, 3-first channel, 4-second channel, 5-base plate, 6-impeller, 7-outer shell, 8-air outlet, 9-counterweight, 10-flat key, 11-screw. Detailed Implementation

[0022] To enable those skilled in the art to better understand and implement the technical solution of this utility model, the present utility model will be further described below with reference to specific embodiments. However, the embodiments described are only for illustration and are not intended to limit the present utility model.

[0023] like Figures 1-4 The eccentric shaft of a rotary engine based on air cooling shown includes two key components: a shaft body 1 and a centrifugal fan 2. The centrifugal fan 2 is mounted on the shaft body 1. A first channel 3 is opened along its axial direction at the center of one end of the shaft body 1, and a second channel 4 is opened radially near the port of the other end and is connected to the first channel 3.

[0024] The centrifugal fan 2 includes a base plate 5 sleeved and fixed on the shaft 1. The base plate 5 is a circular plate structure with a hole in the middle. The size of the hole is adapted to the outer diameter of the shaft 1. Several impellers 6 are evenly fixed on the base plate 5 and spread outward along the axis. The impellers 6 are located on the periphery of the second channel 4.

[0025] The impeller 6 is surrounded by a housing 7, which is fixed to the base plate 5. An air outlet 8 is provided on one side of the housing 7. The first channel 3, the second channel 4, and the air outlet 8 together form the flow path of cooling air. The housing 7 can guide and concentrate the cooling air, allowing it to better enter the interior of the rotor engine. The air outlet 8 discharges the cooling air to achieve cooling of the interior of the rotor engine. When the rotor engine is running, the cooling air in the first channel 3 and the second channel 4 will flow with the rotation of the impeller 6, thereby achieving the forced air cooling effect of the rotor engine.

[0026] Preferably, the base plate 5 is fixedly connected to the counterweight 9 by screws 11. The counterweight 9 and the shaft 1 are provided with sliding grooves, and a flat key 10 is fitted within the grooves. The counterweight 9 and the shaft 1 are driven by the flat key 10. The connection between the base plate 5 and the counterweight 9 allows the centrifugal fan 2 to obtain sufficient weight to increase centrifugal force; the flat key 10 ensures a stable connection between the counterweight 9 and the shaft 1, improving the working stability of the centrifugal fan 2. Through the connection between the base plate 5 and the shaft 1, and the design of the counterweight 9, the system's balance and stable operation are guaranteed.

[0027] Preferably, the first channel 3 and the second channel 4 are cylindrical, with a diameter ratio of 1.5:1 to 3:1, ensuring that the two channels have similar or identical areas. This allows for smooth communication between the first channel 3 and the second channel 4, ensuring that cooling air can smoothly enter the second channel 4 from the first channel 3 and ultimately be blown into the interior of the rotor engine. The different diameter ratios of the first channel 3 and the second channel 4, along with the multi-channel design, increase the airflow area and velocity, thereby improving the heat dissipation effect.

[0028] Preferably, multiple second channels 4 can be provided and located on the same plane. The arrangement of multiple second channels 4 can increase the area of ​​cooling air entering the rotor engine and improve the cooling effect. At the same time, multiple second channels 4 located on the same plane are beneficial for processing and assembly.

[0029] The first channel 3 is conical at the opening end of the shaft 1, so that the cooling air forms a certain flow rate and pressure when it enters the first channel 3, and can better enter the centrifugal fan 2, thus providing a better airflow effect.

[0030] The impeller 6 is provided in six evenly distributed units, ensuring that the impeller 6 can be more evenly distributed on the entire centrifugal fan 2, thereby obtaining better aerodynamic performance and enhancing the flow and heat dissipation of cooling air.

[0031] The edge of the base plate 5 is flush with the outer side of the impeller 6. This design allows the centrifugal fan 2 to have a flatter edge profile, which is beneficial for assembly and maintenance. On the other hand, it maximizes the surface area of ​​the impeller 6, which can drive more cooling airflow.

[0032] Implementation steps of this utility model

[0033] Prepare materials

[0034] Processing

[0035] A first channel 3 is machined along the axial direction at one end of the shaft 1, and a second channel 4 is machined along the radial direction at the other end of the shaft, and the first channel 3 and the second channel 4 are connected; the base plate 5 is a circular plate structure with a hole in the middle, the size of the hole is adapted to the outer diameter of the shaft 1, and the base plate 5 is fixed to the centrifugal fan 2 as a whole.

[0036] assembly

[0037] Centrifugal fan 2 is mounted and fixed on shaft 1, so that impeller 6 rotates with shaft 1. At the same time, base plate 5 is fixedly connected to counterweight 9 by screws 11. Slide grooves are provided on counterweight 9 and shaft 1, and flat key 10 is provided in the slide groove. The counterweight 9 and shaft 1 are driven by flat key 10.

[0038] test

[0039] Start the rotary engine and test the performance and cooling effect of the eccentric shaft used in the air-cooled rotary engine.

[0040] Working principle

[0041] Because the centrifugal fan is entirely mounted on the shaft, when the engine rotates, it drives the impeller to rotate, and the centrifugal fan rotates along with the impeller. The resulting pressure forces the cooling air to... Figure 1 The airflow follows the direction indicated by the middle arrow. Specifically, cooling air enters through the first channel, then passes through the second channel, and is finally driven by the centrifugal fan to achieve forced cooling of the eccentric shaft. As the rotor engine speed increases, the cooling airflow also increases, thus effectively matching the engine's output characteristics.

[0042] This invention has a simple structure, is practical and efficient.

[0043] By simply designing the eccentric shaft, a first channel and a second channel are opened in the axial and radial directions of the shaft body. The two channels are connected to form a complete flow path. The centrifugal fan is fixed on the shaft body by the base plate. When the rotor engine rotates, the centrifugal fan will also rotate at the same time, thereby producing a wind-cooling effect.

[0044] By optimizing the flow of cooling air and the heat dissipation effect, the heat dissipation performance of the rotary engine was improved.

[0045] The first channel, the second channel, and the air outlet together form the airflow path for cooling, which guides the cooling air to the air outlet, thereby further enhancing the heat dissipation effect. The shape and proportion of the first and second channels have also been carefully optimized so that the cooling air can generate appropriate pressure and speed within the channels, thereby effectively reducing the temperature of the rotary engine and improving heat dissipation performance.

[0046] The system operates stably and can meet the requirements for long-term high-efficiency work.

[0047] A counterweight is fitted to the centrifugal fan to maintain balance and stability of the rotor engine while it operates at high speed. Furthermore, the first channel is conical at the opening end of the shaft, providing better airflow. At the edge of the base plate, the impellers are flush with it, ensuring uniform airflow for cooling. Six impellers are evenly distributed on the base plate, enhancing airflow and heat dissipation, enabling the eccentric shaft rotor engine to operate efficiently for extended periods.

[0048] It is reasonably designed, has low manufacturing costs, and is easy to promote and apply.

[0049] On the one hand, the eccentric shaft design of the rotary engine results in low manufacturing costs and facilitates its promotion and application. On the other hand, the implementation of this solution significantly improves the air-cooling effect of the rotary engine, resulting in a marked improvement in its heat dissipation performance. In practical engineering applications, this allows the rotary engine to operate more safely and efficiently.

[0050] All content not described in detail in this utility model is prior art.

[0051] The above description is merely a preferred embodiment of this utility model and is not limited to the description in the specification and embodiments. Therefore, all equivalent changes or modifications made to the structure, features, and principles described in the claims of this utility model should be included within the scope of this utility model patent application.

Claims

1. An eccentric shaft of a wind-cooled rotary engine comprising a shaft body (1) and a centrifugal fan (2), characterized in that: The shaft (1) has a first channel (3) along its axial direction at its center, and a second channel (4) is radially opened at one end of the shaft (1) near the port, and the second channel (4) is connected to the first channel (3); The centrifugal fan (2) includes a base plate (5) fitted and fixed on the shaft (1). The base plate (5) is a circular plate structure with a hole in the middle. The size of the hole is adapted to the outer diameter of the shaft (1). Several impellers (6) are evenly fixed on the base plate (5) and spread outward along the axis. The impellers (6) are located on the periphery of the second channel (4).

2. An air-cooled eccentric shaft for a rotary engine according to claim 1, wherein: The base plate (5) is fixedly connected to the counterweight (9) by screws (11). The counterweight (9) and the shaft (1) are provided with sliding grooves. A flat key (10) is provided in the sliding groove. The counterweight (9) and the shaft (1) are driven by the flat key (10).

3. An air-cooled eccentric shaft for a rotary engine according to claim 1, wherein: The impeller (6) is provided with a housing (7) that encloses it. The housing (7) is fixed to the base plate (5). An air outlet (8) is provided on one side of the housing (7). The first channel (3), the second channel (4), and the air outlet (8) together form the flow path of cooling air.

4. An air-cooled eccentric shaft for a rotary engine according to claim 1, wherein: The first channel (3) and the second channel (4) are cylindrical, and the diameter ratio of the first channel (3) to the second channel (4) is 1.5:1-3:

1.

5. An eccentric shaft for a wind-cooled rotary engine according to claim 1, wherein: The first channel (3) is conical at the opening end of the shaft (1).

6. An air-cooled eccentric shaft for a rotary engine based on wind cooling according to claim 1, characterized in that: The edge of the base plate (5) is flush with the outer side of the impeller (6).

7. An eccentric shaft for a wind-cooled rotary engine according to claim 1, wherein The base plate (5) has six impellers (6).

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