Cooling structure of air-cooled rotor engine

Abstract

The utility model relates to an air-cooled rotor engine cooling structure which comprises a front end cover, a rear end cover and an air cylinder body, a cooling fin III, a cooling fin IV and a cooling fin VII are correspondingly arranged in the circumferential direction of the front end cover, the circumferential direction of the air cylinder body and the circumferential direction of the rear end cover respectively, and the cooling fin IV, the cooling fin III and the cooling fin VII are correspondingly arranged. And the thicknesses are gradually reduced from the root part to the tail end. By changing the structural shape of the radiating fins, the thickness of the radiating fins arranged in the circumferential direction is gradually reduced from the root to the tail end, so that the area and the heat conduction sectional area of the radiating fins are increased, meanwhile, the radiating fins are distributed densely and long in a hot arc area and distributed sparsely and short in a cold arc area, and the temperature difference between the hot arc area and the cold arc area is effectively reduced.

Description

Technical Field

[0001] The utility model relates to an air-cooled rotary engine, in particular to a cooling structure of an air-cooled rotary engine. Background Art

[0002] The air-cooled rotary engine has the advantages of simple structure, light weight, small volume, large power, etc., and is an ideal power source for aircraft such as unmanned aerial vehicles and cruise missiles. However, due to the large amount of heat generated by the rotary engine, the high temperature of the combustion chamber, and the large temperature difference between the cold arc area and the hot arc area, serious faults such as cylinder scoring, failure of the sealing spring, and failure of the sealing system will occur, greatly reducing the service life and safety of the air-cooled rotary engine. Summary of the Invention

[0003] The utility model provides a cooling structure of an air-cooled rotary engine, which changes the structural form of the heat sink, so that the heat sink is distributed more densely and longer in the hot arc area and more sparsely and shorter in the cold arc area, effectively reducing the temperature difference between the hot arc area and the cold arc area, enhancing the heat dissipation effect, and improving the service life of the air-cooled rotary engine.

[0004] The purpose of the utility model and the solution to its technical problems are achieved by adopting the following technical solutions. An air-cooled rotary engine cooling structure according to the utility model includes a front end cover, a rear end cover, and a cylinder block. The front end cover, the cylinder block, and the rear end cover are respectively provided with heat sinks III, heat sinks IV, and heat sinks VII in the circumferential direction. The heat sinks IV, heat sinks III, and heat sinks VII are correspondingly arranged and all have a gradually decreasing thickness from the root to the end.

[0005] The purpose of the utility model and the solution to its technical problems can also be further realized by adopting the following technical measures.

[0006] For the above-mentioned air-cooled rotary engine cooling structure, a wind guide cover I extending along the circumferential direction of the front end cover is connected to the end of the heat sink III, a wind guide cover II extending along the circumferential direction of the cylinder block is connected to the end of the heat sink IV, a wind guide cover III extending along the circumferential direction of the rear end cover is connected to the end of the heat sink VII, and both ends of the heat sink IV extend out of the wind guide cover II.

[0007] For the above-mentioned air-cooled rotary engine cooling structure, the wind guide cover I, the wind guide cover II, and the wind guide cover III are all in the structure of a flared mouth with a large air inlet and a small air outlet.

[0008] For the above-mentioned air-cooled rotary engine cooling structure, a plurality of heat sinks I are convexly provided at the center edge of the outer end face of the front end cover, a plurality of heat sinks V are convexly provided at the center edge of the outer end face of the rear end cover, the outer end face of the heat sink VII extends outward to form a heat sink VI protruding from the wind guide cover III, and the root of the heat sink VI is connected to the heat sink V; the outer end face of the heat sink III extends outward to form a heat sink II protruding from the wind guide cover I, and the heat sink II is connected to the heat sink I.

[0009] The aforementioned air-cooled rotor engine cooling structure, wherein the air guide cover and the heat dissipation fins connected thereto are integrally formed.

[0010] The aforementioned air-cooled rotor engine cooling structure, wherein the root thickness of the fourth heat dissipation fin, the third heat dissipation fin, and the seventh heat dissipation fin is 8 mm, and the length from the root to the end is greater than 70 mm.

[0011] Compared with the prior art, the present utility model has obvious advantages and beneficial effects. By means of the above technical solutions, the present utility model can achieve quite high technical progressiveness and practicality, and has wide industrial utilization value. It has at least the following advantages:

[0012] By changing the structural shape of the heat dissipation fins, the present utility model makes the circumferentially arranged heat dissipation fins gradually decrease in thickness from the root to the end, thereby increasing the area and heat conduction cross-sectional area of the heat dissipation fins. At the same time, the heat dissipation fins are distributed densely and long in the hot arc area and sparsely and short in the cold arc area, effectively reducing the temperature difference between the hot arc area and the cold arc area.

[0013] The end of the circumferentially distributed heat dissipation fins of the present utility model is also connected with an air guide cover, and the purpose of guiding air and increasing the wind speed is achieved through the air guide cover, thereby improving the heat dissipation effect.

[0014] The air guide cover of the present utility model also has a flared structure with the size gradually decreasing from the windward end to the leeward end, thereby increasing the air guiding efficiency and further increasing the flow rate of the cooling air flow.

[0015] In summary, the air-cooled rotor engine cooling structure of the present utility model can effectively increase the cooling area, improve the heat transfer efficiency and the cooling air speed, thereby reducing the temperature of the combustion chamber, reducing the temperature difference between the hot arc area and the cold arc area, effectively solving the problem of excessive heat load of the air-cooled rotor engine, and improving the service life of the engine. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the air-cooled rotor engine of the present utility model;

[0017] Figure 2 is a left view of the front end cover;

[0018] Figure 3 is a front view of the front end cover;

[0019] Figure 4 is a right view of the front end cover;

[0020] <\ Figure 5 is a three-dimensional schematic diagram of the cylinder block;

[0021] Figure 6 is a left view of the rear end cover;

[0022] Figure 7 is a front view of the rear end cover;

[0023] Figure 8 It is the right view of the rear end cover.

[0024]

Description of Main Component Symbols

[0025] 1. Front end cover, 101. Radiating fin I, 102. Radiating fin II, 103. Radiating fin III, 104. Air guide cover I, 2. Cylinder block, 201. Radiating fin IV, 202. Air guide cover II, 3. Rear end cover, 301. Radiating fin V, 302. Radiating fin VI, 303. Radiating fin VII, 304. Air guide cover III. Specific Embodiment

[0026] To further elaborate on the technical means and effects adopted by the present utility model to achieve the predetermined invention purpose, the following, in conjunction with the attached drawings and preferred embodiments, details the specific embodiment, structure, features and effects of the air-cooled rotor engine cooling structure proposed according to the present utility model as follows.

[0027] Please refer to Figure 1-8 , which is the schematic diagram of each part of the air-cooled rotor engine cooling structure of the present utility model. The air-cooled rotor engine cooling structure includes a front end cover 1, a cylinder block 2 and a rear end cover 3. The front end cover 1 covers the front end face of the cylinder block 2, and the rear end cover 3 covers the rear end face of the cylinder block 2. A plurality of radiating fins III 103 are circumferentially spaced on the front end cover 1, and the end of the radiating fin III 103 is connected to the air guide cover I 104 extending along the circumference of the front end cover 1. The inner diameter of the air inlet end of the air guide cover I 104 is larger than the inner diameter of the air outlet end, so that the air guide cover I 104 has a flared structure with a large inlet size and a small outlet size. Thus, the end face (the end far from the front end cover 1) of the radiating fin III 103 connected to the air guide cover 104 I is an inclined plane.

[0028] At the center edge of the outer end face (the end face facing away from the cylinder block 2) of the front end cover 1, a plurality of radiating fins I 101 also protrude. At a position far from the center, the above-mentioned radiating fins I 101 extend outward into multiple radiating fins II 102, and the radiating fins II 102 are connected to the radiating fins III 103. That is, the front end face of the radiating fin III 103 of the present utility model extends forward along the axis of the front end cover 1 to form the radiating fin II 102 protruding from the air guide cover I 104. The inner end face (the end face close to the front end cover 1) of the radiating fin II 102 is connected to the radiating fin I 101. And each radiating fin I 101 is connected to at least two radiating fins II 102.

[0029] In this embodiment, the radiating fins II 102 and the radiating fins III 103 are cast together, and the air guide cover I 104 is cast together with the radiating fins III 103. In other embodiments, the air guide cover I 104 can be made of other high-temperature resistant materials and installed on the radiating fins III 103 later.

[0030] The rear end cover 3 is circumferentially provided with a plurality of heat dissipation fins VII 303 at intervals. The end of the heat dissipation fin VII 303 is connected to a wind guide cover III 304 extending along the circumference of the rear end cover. The wind guide cover III 304 also has a flared structure with a larger front and a smaller rear, so that more air can be introduced into the air inlet. The center edge of the outer end face of the rear end cover 3 is also convexly provided with a plurality of heat dissipation fins V 301. At a position far from the center, the heat dissipation fin V 301 extends outward into multiple heat dissipation fins VI 302, and the front end face of the heat dissipation fin VI 302 is connected to the rear end of the heat dissipation fin VII 303. In this embodiment, the rear end face of the heat dissipation fin VII 303 extends backward along the circumference of the rear end cover 3 to form a heat dissipation fin VI 302 protruding from the wind guide cover III 304, and the heat dissipation fin VI 302 is connected to the heat dissipation fin V 301. Preferably, the heat dissipation fin VII 303 and the heat dissipation fin VI 302 are cast together. The wind guide cover III 304 can be cast together with the heat dissipation fin VII 303, or can be made of other high-temperature resistant materials and installed on the heat dissipation fin VII 303 later.

[0031] The cylinder block 2 is circumferentially provided with a plurality of heat dissipation fins IV 201 at intervals, and the end of the heat dissipation fin IV 201 is connected to the inner wall of a wind guide cover II 202 extending along the circumference of the cylinder block 2. The inner diameter of the wind guide cover II 202 gradually increases from front to back, and the overall shape is a flared structure, so that the front end of the wind guide cover II 202 as the air inlet has a larger air inlet area, and the rear end as the air outlet has a smaller air outlet area, thereby enhancing the flow rate of the cooling air between the heat dissipation fins IV 201, and further enhancing its cooling effect.

[0032] The extension length of the wind guide cover II 202 along the axial direction of the cylinder block 2 is less than that of the heat dissipation fin IV 201, so that both the front and rear ends of the heat dissipation fin IV 201 protrude from the wind guide cover II 202. Thus, when the front and rear end covers are fixed at both ends of the cylinder block 2, there are gaps between the wind guide cover II 202 and the wind guide cover I 104 and the wind guide cover III 304, so that fresh air can enter between the heat dissipation fins III 103 and between the heat dissipation fins IV 201 through these gaps to achieve the purpose of heat dissipation.

[0033] The thickness, the length from the root to the end, and the distribution position of the heat dissipation fin IV 201, the heat dissipation fin III 103, and the heat dissipation fin VII 303 are the same, that is, when the cylinder block, the front end cover, and the rear end cover are assembled, the above-mentioned heat dissipation fin IV 201, heat dissipation fin III 103, and heat dissipation fin VII 303 correspond to each other one by one, so that the heat dissipation channels formed between adjacent heat dissipation fins correspond to each other and are axially connected to each other.

[0034] In this embodiment, the thicknesses of the heat sink Ⅳ 201, the heat sink Ⅲ 103, and the heat sink Ⅶ 303 gradually decrease from the root to the end. That is, the cross-sections of the heat sink Ⅳ 201, the heat sink Ⅲ 103, and the heat sink Ⅶ 303 of the present utility model are all isosceles triangles, and the apex of the triangle is connected to the air guide cover. Specifically, the root thicknesses of the heat sink Ⅳ 201, the heat sink Ⅲ 103, and the heat sink Ⅶ 303 are 8 mm, the length from the root to the end is greater than 70 mm, while the thickness of the existing heat sink from the root to the end is 2 mm and the length is less than 50 mm. The structural arrangement of the heat sink of the present utility model increases the heat dissipation area of the heat sink while increasing the heat conduction cross-sectional area of the heat sink. As a result, the above heat sinks are denser and longer in the hot arc area and sparser and shorter in the cold arc area. This arrangement can effectively reduce the temperature difference between the hot arc area and the cold arc area.

[0035] The above is only a preferred embodiment of the present utility model and does not impose any formal limitations on the present utility model. Although the present utility model has been disclosed above with the preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to form an equivalent embodiment within the scope of the technical solution of the present utility model. However, any simple modification, equivalent change, and modification made to the above embodiment based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. An air-cooled rotor engine cooling structure, comprising a front end cover, a rear end cover and a cylinder block, characterized in that: The front end cover, the cylinder block and the rear end cover are respectively provided with heat dissipation fins III, IV and VII in the circumferential direction, and the heat dissipation fins III, IV and VII are gradually reduced in thickness from the root to the end.

2. The air-cooled rotor engine cooling structure according to claim 1, wherein: The end of the heat dissipation fin III is connected with a wind guide cover I extending along the circumferential direction of the front end cover, the end of the heat dissipation fin IV is connected with a wind guide cover II extending along the circumferential direction of the cylinder block, and the end of the heat dissipation fin VII is connected with a wind guide cover III extending along the circumferential direction of the rear end cover. Both ends of the heat dissipation fin IV extend out of the wind guide cover II.

3. The air-cooled rotor engine cooling structure according to claim 2, characterized in that: The wind guide covers I, II and III are all in a horn-shaped structure with a large air inlet and a small air outlet.

4. The air-cooled rotor engine cooling structure according to claim 3, wherein: Several heat dissipation fins I are also convexly provided at the center edge of the outer end face of the front end cover, and several heat dissipation fins V are convexly provided at the center edge of the outer end face of the rear end cover. The outer end face of the heat dissipation fin VII extends outward to form a heat dissipation fin VI protruding from the wind guide cover III, and the root of the heat dissipation fin VI is connected to the heat dissipation fin V; the outer end face of the heat dissipation fin III extends outward to form a heat dissipation fin II protruding from the wind guide cover I, and the heat dissipation fin II is connected to the heat dissipation fin I.

5. The air-cooled rotor engine cooling structure according to claim 4, wherein: The wind guide cover is integrally formed with the heat dissipation fin it is connected to.

6. The air-cooled rotor engine cooling structure according to claim 1, wherein: The root thickness of the heat dissipation fins IV, III and VII is 8 mm, and the length from the root to the end is greater than 70 mm.

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