Heat dissipation system, electric engine, electric propulsion device and aircraft

Abstract

The utility model provides a heat dissipation system, an electric engine, an electric propulsion device and an aircraft, and relates to the technical field of aircrafts. The cooling system comprises a radiator and a fan, the radiator is used for cooling target equipment, and the radiator is provided with an airflow channel for airflow circulation. The fan is provided with an air suction side and an air exhaust side in the axial direction of the fan, the air suction side faces the radiator, and the fan is used for sucking air for the radiator so that air flow on one side of the radiator can flow through the air flow channel and be exhausted from the air exhaust side. In this way, the heat dissipation efficiency of the heat dissipation system is high, and the working performance of the target equipment can be guaranteed.

Description

Technical Field

[0001] The present application relates to the field of aircraft technology, and in particular to a heat dissipation system, an electric engine, an electric propulsion device, and an aircraft. Background Art

[0002] An electric vertical take-off and landing (eVTOL) aircraft includes an electric propulsion system, which includes a propeller and an electric motor. The electric motor includes a power motor, which is connected to the propeller and drives the propeller. During operation, the power motor generates a large amount of heat. If the power motor is not cooled in a timely manner, its operation will be affected. Utility Model Content

[0003] The present application aims to provide a heat dissipation system, an electric engine, an electric propulsion device and an aircraft. The heat dissipation efficiency of the heat dissipation system is high, which is conducive to ensuring the working performance of the target equipment.

[0004] A first aspect of an embodiment of the present application provides a heat dissipation system, the heat dissipation system comprising:

[0005] A radiator, which is used to dissipate heat from the target device and has an airflow channel for airflow;

[0006] The fan has an air suction side and an air exhaust side along its axial direction. The air suction side faces the radiator. The fan is used to suck air from the radiator so that the air flow on one side of the radiator flows through the air flow channel and is discharged from the exhaust side.

[0007] The heat dissipation system provided in the embodiment of the present application is such that the airflow at the radiator is sucked into the radiator and then flows to the fan. The airflow sucked into the radiator is not easily turbulent due to the rebound of the heat dissipation structure of the radiator, and the airflow on the air inlet side of the radiator is not easily squeezed and flows to the external area of ​​the radiator. The air pressure at various parts of the radiator can be relatively uniform, and the airflow flowing through various parts of the radiator can be relatively uniform, so that the heat dissipation at various parts of the radiator is relatively balanced.

[0008] In addition, after the air flows through the radiator for heat exchange, the fan sucks away the air flow on the air outlet side of the radiator, making it less likely that the air flow flowing out of the radiator after heat exchange will flow back into the radiator.

[0009] In addition, the heat dissipation of the radiator is achieved by utilizing the airflow passing through the radiator, which is more efficient in dissipating the heat of the radiator.

[0010] In summary, the solution provided in the embodiment of the present application has a high heat dissipation efficiency of the radiator, which makes the heat dissipation efficiency of the heat dissipation system high, making it convenient to achieve a good heat dissipation effect through a smaller heat dissipation system, and then facilitate to achieve good heat dissipation of the target device in a smaller space, which is beneficial to ensure the working performance of the target device.

[0011] In one possible implementation, the heat sink includes multiple heat dissipation flat tubes, which are spaced apart and form airflow channels between adjacent heat dissipation flat tubes. Both ends of each heat dissipation flat tube are connected to a liquid cooling channel within the target device to form a cooling medium circulation loop.

[0012] In one possible implementation, the radiator further includes a first header and a second header, wherein the first header is connected to one end of the plurality of heat dissipation flat tubes, and the second header is connected to the other end of the plurality of heat dissipation flat tubes. The first header and the second header are connected to the liquid cooling channel.

[0013] In one possible implementation, a first partition plate is provided in the first collecting pipe, which divides the first collecting pipe into a first section and a second section; and / or a second partition plate is provided in the second collecting pipe, which divides the second collecting pipe into a third section and a fourth section.

[0014] One of the first section and the second section is provided with a first liquid inlet, and the other of the first section and the second section is provided with a first liquid outlet; or, one of the third section and the fourth section is provided with a second liquid inlet, and the other of the third section and the fourth section is provided with a second liquid outlet; or, one of the first section and the third section is provided with a first liquid inlet, and the other of the first section and the third section is provided with a first liquid outlet, one of the second section and the fourth section is provided with a second liquid inlet, and the other of the second section and the fourth section is provided with a second liquid outlet.

[0015] In one possible implementation, when a first partition plate is provided in the first collecting pipe and a second partition plate is provided in the second collecting pipe: a third partition plate is provided in the first section, the third partition plate divides the first section into a first sub-section and a second sub-section, the first liquid inlet is located in the first sub-section, a fourth partition plate is provided in the third section, the fourth partition plate divides the third section into a third sub-section and a fourth sub-section, and the first liquid outlet is located in the fourth sub-section.

[0016] In one possible implementation, when a first partition plate is provided in the first liquid collecting pipe and a second partition plate is provided in the second liquid collecting pipe: a fifth partition plate is provided in the second section, the fifth partition plate divides the second section into a fifth sub-section and a sixth sub-section, the second liquid outlet is located in the sixth sub-section, a sixth partition plate is provided in the fourth section, the sixth partition plate divides the fourth section into a seventh sub-section and an eighth sub-section, and the second liquid inlet is located in the seventh sub-section.

[0017] In a possible implementation, the first collecting pipe and the second collecting pipe are both arc-shaped pipes, two ends of the two arc-shaped pipes are connected to form an annular structure, and each heat dissipating flat pipe is located in the annular structure.

[0018] In one possible implementation, the heat dissipation system further includes a liquid supply pipe and a liquid return pipe. One end of the liquid return pipe is connected to the inlet of the radiator, and the other end of the liquid return pipe is used to connect to the liquid cooling channel of the target device. One end of the liquid supply pipe is connected to the outlet of the radiator, and the other end of the liquid supply pipe is used to connect to the liquid cooling channel of the target device. The liquid return pipe, radiator, and liquid supply pipe are used to form a cooling medium circulation loop with the liquid cooling channel of the target device.

[0019] At least one of the liquid supply pipe and the liquid return pipe is a rigid pipe, and the radiator is rigidly connected to the target device through at least one of the liquid supply pipe and the liquid return pipe.

[0020] In one possible embodiment, the liquid supply pipe and the liquid return pipe are both rigid pipes, and there are multiple liquid supply pipes and multiple liquid return pipes. The radiator is rigidly connected to the target device through the multiple liquid supply pipes and the multiple liquid return pipes. The radiator includes multiple outlet ends corresponding one-to-one to the liquid supply pipes, and a pair of inlet ends corresponding one-to-one to the liquid return pipes. Each inlet end of the radiator is connected to the liquid cooling channel through the corresponding liquid return pipe, and each outlet end of the radiator is connected to the liquid cooling channel through the corresponding liquid supply pipe.

[0021] In a possible implementation, the heat dissipation system further includes a drive motor and a transmission shaft;

[0022] The drive motor is used to be fixedly mounted on the housing of the target device. One end of the transmission shaft is connected to the output shaft of the drive motor, and the other end of the transmission shaft passes through the radiator and is connected to the fan.

[0023] In a possible implementation, the fan includes a plurality of blades, and an air outlet angle of the blades is greater than or equal to 20° and less than or equal to 40°.

[0024] In one possible implementation, the fan blade includes a first structural portion and a second structural portion that are connected, the first structural portion is close to the air suction side, the second structural portion is close to the air exhaust side, and the thickness of the first structural portion is less than the thickness of the second structural portion.

[0025] In a possible implementation, the thickness of the first structure portion gradually increases from the first structure portion to the second structure portion.

[0026] In a possible implementation, the first structural portion includes a suction surface, and the suction surface is a planar structure perpendicular to the axial direction of the fan.

[0027] In a possible implementation, the fan further includes a hub, and the fan blades are arranged on the hub;

[0028] The fan blade includes a leading edge and an outer peripheral edge. The leading edge is close to the air suction side, and the outer peripheral edge is located on the side of the fan blade away from the hub. The leading edge is connected to the outer peripheral edge, and the connection between the leading edge and the outer peripheral edge forms a pointed structure protruding toward the direction of rotation of the fan blade.

[0029] A second aspect of an embodiment of the present application provides an electric engine, which includes a power motor and a cooling system in any of the above-mentioned embodiments. The radiator of the cooling system is used to dissipate heat from the power motor, and the fans of the power motor and the cooling system are respectively located on both sides of the radiator.

[0030] In one possible implementation, the power motor has a liquid cooling channel, the outlet end of the liquid cooling channel is connected to the inlet end of the radiator, the outlet end of the radiator is connected to the inlet end of the liquid cooling channel, and the liquid cooling channel and the radiator are used to form a cooling medium circulation loop.

[0031] A third aspect of the embodiments of the present application provides an electric propulsion device, the electric propulsion device comprising a propeller and an electric engine in any one of the above embodiments;

[0032] The propeller is connected to the power motor of the electric engine, and the power motor is used to drive the propeller to rotate.

[0033] A fourth aspect of the embodiments of the present application provides an aircraft, the aircraft comprising a fuselage, wings, a tail, and the electric propulsion device of any one of the above embodiments;

[0034] The electric propulsion device is arranged on the wings, and / or the fuselage, and / or the tail. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0036] Figure 1 A schematic diagram of an aircraft provided in an embodiment of the present application;

[0037] Figure 2 A schematic diagram of an electric engine provided in an embodiment of the present application;

[0038] Figure 3 A schematic diagram of another electric engine provided in an embodiment of the present application;

[0039] Figure 4 A schematic diagram of another electric engine provided in an embodiment of the present application;

[0040] Figure 5 A schematic diagram of an impeller from one perspective provided in an embodiment of the present application;

[0041] Figure 6 for Figure 5 A schematic diagram of another perspective of the impeller provided in;

[0042] Figure 7 for Figure 5 A schematic diagram of another perspective of the impeller provided in ;

[0043] Figure 8 for Figure 5 A schematic diagram of another perspective of the impeller provided in ;

[0044] Figure 9 A simulation diagram of the airflow field of an electric engine provided in an embodiment of the present application using an impeller in the prior art;

[0045] Figure 10 An electric motor provided in the embodiment of the present application adopts Figure 5 Simulation diagram of the airflow field of the impeller;

[0046] Figure 11 A schematic diagram of a radiator provided in an embodiment of the present application.

[0047] Description of reference numerals:

[0048] 11. Fuselage; 12. Wings; 13. Tail; 14. Arms; 15. Nacelle;

[0049] 20. Electric propulsion device; 20a. Fixed electric propulsion device; 20b. Tilting electric propulsion device; 21. Electric engine; 22. Propeller;

[0050] 100. Power motor; 110. Liquid cooling channel;

[0051] 200, fan;

[0052] 210, impeller; 211, blade; 2111, leading edge; 2112, trailing edge; 2113, inner peripheral edge; 2114, outer peripheral edge; 2115, first structural portion; 21151, suction surface; 2116, second structural portion; 2117, sharp angle structure; 212, hub;

[0053] 220, fan cover;

[0054] 300, radiator;

[0055] 310, first manifold; 311, first partition plate; 312, first section; 3121, third partition plate; 3122, first subsection; 3123, second subsection; 313, second section; 3131, fifth partition plate; 3132, fifth subsection; 3133, sixth subsection;

[0056] 320, heat dissipation flat tube;

[0057] 330, second manifold; 331, second partition plate; 332, third section; 3321, fourth partition plate; 3322, third subsection; 3323, fourth subsection; 333, fourth section; 3331, sixth partition plate; 3332, seventh subsection; 3333, eighth subsection;

[0058] 341, first liquid inlet; 342, first liquid outlet; 343, second liquid inlet; 344, second liquid outlet;

[0059] 400, liquid pump;

[0060] 500, liquid supply pipe;

[0061] 600, liquid return pipe;

[0062] 700, drive motor; 710, transmission shaft;

[0063] a. Wind outlet angle. DETAILED DESCRIPTION

[0064] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0065] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0066] In this application, unless otherwise specified or limited, the terms "mounted," "connected," and "fixed" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integration; direct connections, indirect connections through an intermediate medium, or internal connections between two components or interactions between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0067] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0068] In the above description, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0069] An embodiment of the present application provides an aircraft, which may be an electric vertical take-off and landing (eVTOL) aircraft, or may be other aircraft.

[0070] Figure 1 A schematic diagram of an aircraft provided in an embodiment of the present application. Figure 1 The aircraft shown is for illustration only and does not constitute a limitation to the specific structure and shape of the aircraft.

[0071] like Figure 1As shown, the aircraft includes a fuselage 11, wings 12 and a tail 13. Among them, the fuselage 11 is a symmetrical structure, and the remaining structure and shape of the fuselage 11 are not limited, and can refer to the structure of the fuselage 11 of the existing aircraft. The wings 12 are fixedly connected to the fuselage 11 and extend along both sides of the fuselage 11. The wings 12 on both sides are symmetrically arranged relative to the symmetry plane of the fuselage 11. The structure of the wings 12 can also refer to the fixed wing 12 structure of the existing aircraft, and will not be repeated here. The tail 13 is fixedly set at the tail of the fuselage 11. The tail 13 is integrally formed with the fuselage 11 or mechanically connected, and has a symmetrical structure. The structure of the tail 13 can also refer to the tail 13 structure of the existing aircraft, and will not be repeated here.

[0072] It should be noted that, in some scenarios, the aircraft may also include a fuselage 11 and wings 12 , that is, the aircraft does not include a tail 13 .

[0073] like Figure 1 As shown, the aircraft further includes an electric propulsion device 20, which can be used to provide power for the aircraft. The number of the electric propulsion device 20 is one or more electric propulsion devices 20, for example Figure 1 As shown, the aircraft includes eight electric propulsion devices 20 .

[0074] The electric propulsion device 20 is arranged on the fuselage 11 and / or the wings 12 and / or the tail 13, for example Figure 1 As shown, electric propulsion devices 20 are symmetrically provided on the wings 12 and the tail 13. Of course, in some scenarios, the electric propulsion devices 20 are provided on the fuselage 11, while the wings 12 and tail 13 are not provided with electric propulsion devices 20. In other scenarios, the electric propulsion devices 20 are provided on the wings 12, while the fuselage 11 and tail 13 are not provided with electric propulsion devices 20. In still other scenarios, the electric propulsion devices 20 are provided on the tail 13, while the fuselage 11 and wings 12 are not provided with electric propulsion devices 20.

[0075] Continue to see Figure 1 As shown, the aircraft further includes an arm 14 and a nacelle 15, both of which are used to connect to an electric propulsion device 20, so as to set the electric propulsion device 20 on the fuselage 11, the wing 12, or the tail 13. Of course, in some scenarios, the aircraft may also include either the arm 14 or the nacelle 15.

[0076] In some embodiments, as Figure 1 As shown, the electric propulsion device 20 is disposed on the wing 12 via the arm 14. In other embodiments, the electric propulsion device 20 may also be disposed on the wing 12 via a nacelle 15 (not shown in the figure).

[0077] In some embodiments, as Figure 1As shown, the electric propulsion device 20 is disposed on the tail 13 via the nacelle 15. In other embodiments, the electric propulsion device 20 may also be disposed on the tail 13 via the machine arm 14 (not shown in the figure).

[0078] In some examples, the electric propulsion device 20 provided on the aircraft may include a fixed electric propulsion device 20 a , which is fixedly connected to any one of the fuselage 11 , the wings 12 , and the tail 13 .

[0079] In some examples, the electric propulsion device 20 provided on the aircraft may include a tilting electric propulsion device 20b, and a tilting mechanism is provided between the tilting electric propulsion device 20b and any one of the fuselage 11, wings 12 and tail 13, and the tilting mechanism is used to adjust the tilt angle of the tilting electric propulsion device 20b.

[0080] In some examples, all electric propulsion devices 20 provided on the aircraft are fixed electric propulsion devices 20 a.

[0081] In other examples, all electric propulsion devices 20 provided on the aircraft are tilting electric propulsion devices 20b.

[0082] In some other examples, some of the electric propulsion devices 20 provided on the aircraft are fixed electric propulsion devices 20a, and some of the electric propulsion devices 20 are tilting electric propulsion devices 20b, for example. Figure 1 As shown, four of the electric propulsion devices 20 are fixed electric propulsion devices 20a, and the remaining four electric propulsion devices 20 are tilting electric propulsion devices 20b. The fixed electric propulsion devices 20a are arranged on the outside of the tilting electric propulsion devices 20b.

[0083] In this embodiment, the electric propulsion device 20 includes a power battery (not shown), an electric motor 21, and a propeller 22. The electric motor 21 includes a power motor 100, a motor controller (not shown), and cables, and can convert electrical energy into mechanical energy. In actual implementation, the electric motor 21 can also be referred to as an electric propulsion system.

[0084] like Figure 1 As shown, the electric engine 21 is arranged on the arm 14 or the nacelle 15, and the propeller 22 is arranged on one side of the electric engine 21. The electric engine 21 is transmission-connected to the propeller 22, and the electric engine 21 is used to drive the propeller 22 to rotate to provide power for the aircraft.

[0085] like Figure 2 As shown, in the embodiment of the present application, the electric engine 21 includes a power motor 100, and the power motor 100 can be set on the fuselage 11 and / or the wing 12 and / or the tail 13 through a mounting seat.

[0086] The propeller 22 may be disposed on one side of the power motor 100 . The power motor 100 is in transmission connection with the propeller 22 . The power motor 100 is used to drive the propeller 22 to rotate.

[0087] The present embodiment further provides a heat dissipation system, comprising a heat sink 300, which can be used to dissipate heat from a target device. For example, the target device can be a power motor 100, or other device requiring heat dissipation. The present embodiment uses the power motor 100 as an example for illustration.

[0088] In the embodiment of the present application, the electric motor 21 may include a heat dissipation system, which may be provided on a side of the power motor 100 facing away from the propeller 22. The radiator 300 may be used to dissipate heat from the power motor 100. The radiator 300 may be provided on the housing of the power motor 100, and the heat from the power motor 100 may be transferred to the radiator 300.

[0089] The heat dissipation system further includes a fan 200 , which is disposed on a side of the power motor 100 facing away from the propeller 22 . The fan 200 is used to dissipate heat from the radiator 300 .

[0090] Illustratively, the fan 200 includes an impeller 210 , and the rotation of the impeller 210 causes air to flow at the radiator 300 , thereby cooling the radiator 300 .

[0091] In the related art, the radiator and the power motor are respectively arranged on both sides of the fan, that is, the fan is located between the radiator and the power motor, and the fan is used to blow air toward the radiator to cool the radiator.

[0092] Many high-power, heat-generating moving parts, such as the drive motors of new energy vehicles and the engines of fuel vehicles, generate a lot of heat during operation. Therefore, they are usually equipped with a cooling system (radiator and fan). The airflow generated by the fan blows through the radiator, thereby removing the heat generated by the moving parts. The heat dissipation of motors and engines such as automobiles is relatively spacious due to the structural layout and no rigid quality requirements. Therefore, in order to meet the heat dissipation requirements, there are not too many restrictions on the size of the radiator and the fan, and the front end of the radiator is usually not very tight and has no excessive obstruction. In order to meet the weight and layout space requirements of current electric vertical take-off and landing aircraft, the design of the product is usually required to be small and precise, and to ensure the achievement of performance. In this way, the air inlet of the radiator may be blocked by components such as the drive motor. This layout will inevitably cause new problems that do not occur in other industries, such as uneven distribution of the air intake, which can seriously cause a large amount of heat backflow in the middle area of ​​the radiator.

[0093] Specifically, the wind blown out by the fan is blocked by the heat dissipation structure of the radiator, and will rebound to form turbulence. In addition, due to the centrifugal force of the fan's rotation, the wind speed in the outer area of ​​the fan is higher than the wind speed in the middle area of ​​the fan, which will cause the air between the fan and the radiator to flow toward the outside of the fan, resulting in the phenomenon that the air pressure in the middle area of ​​the fan is low and the air pressure in the outer area of ​​the fan is high. At this time, the wind blown out by the fan will pass through the part of the radiator close to the outside. On the side of the radiator facing away from the fan (that is, the air outlet side of the radiator), due to the pressure difference between the middle area of ​​the radiator and the area near the part of the radiator close to the outside, the air that has passed through the radiator and exchanged heat with the radiator will flow to the middle area of ​​the radiator. Due to the pressure difference between the middle area of ​​the radiator on the side close to the fan and the side away from the fan (that is, the pressure difference between the middle area of ​​the radiator on the air inlet side and the air outlet side of the radiator), the air on the side of the radiator away from the fan will pass through the middle area of ​​the radiator and flow back to the side of the radiator close to the fan. The wind blown by the fan is difficult to dissipate the heat of the middle area of ​​the radiator, and the return air passing through the middle part of the radiator will heat the radiator, resulting in poor cooling effect of the fan on the radiator, making the power motor prone to overheating and other problems.

[0094] In related fields, to improve heat dissipation, the size of the radiator or fan is increased, or the distance between the radiator and fan is increased. However, increasing the size of the radiator or fan, or increasing the distance between the radiator and fan, often results in an increase in the size of the device. However, aircraft electric engines are relatively small, and the space for the cooling system is often limited, making it impossible to install the large radiators or fans commonly used in related fields, or to increase the distance between the radiator and fan.

[0095] like Figure 2 As shown, based on this, in an embodiment of the present application, along the axial direction of the power motor 100, the fan 200 and the power motor 100 are respectively located on both sides of the radiator 300, and the fan 200 has an air suction side and an air exhaust side, the air suction side faces the radiator 300, and the fan 200 is used to suck air from the radiator 300, so that the fan 200 sucks the airflow on one side of the radiator 300 and discharges it from the exhaust side.

[0096] In this way, the heat dissipation at the radiator 300 is achieved by having the airflow at the radiator 300 be drawn away by the fan 200 located on the side of the radiator 300 facing away from the power motor 100. Since the airflow at the radiator 300 is drawn into the radiator 300 and then flows toward the fan 200, the airflow drawn into the radiator 300 is less likely to form turbulence due to rebound from the heat dissipation structure of the radiator 300. The airflow on the air inlet side of the radiator 300 is less likely to be squeezed and flow toward the outer area of ​​the radiator 300. This can ensure that the air pressure at all locations of the radiator 300 is relatively uniform, making the airflow flowing through all locations of the radiator 300 relatively uniform and dissipating heat more evenly across all locations of the radiator 300. Furthermore, after the airflow passes through the radiator 300 for heat exchange, the fan 200 draws away the airflow on the air outlet side of the radiator 300, making it less likely that the airflow flowing out of the radiator 300 after heat exchange will flow back into the radiator 300. In addition, the direction of the airflow driven by the fan 200 is relatively consistent with the direction of the airflow driven by the propeller 22, which is conducive to the airflow passing through the radiator 300 and is also conducive to taking away the air flowing out of the air outlet side of the radiator 300. It is not easy for the airflow driven by the fan 200 to flow in the opposite direction to the airflow driven by the propeller 22 to affect the airflow passing through the radiator 300, and the airflow flowing out of the air outlet side of the radiator 300 to form turbulence and flow back into the radiator 300. The aerodynamic interference generated by the fan 200 is also relatively small. In summary, the solution provided by the embodiment of the present application has a high heat dissipation efficiency of the radiator 300, which facilitates the realization of a good heat dissipation effect through a small heat dissipation system, and further facilitates the realization of a good heat dissipation effect for the power motor 100 in the small electric engine 21, which is conducive to ensuring the working performance of the power motor 100.

[0097] For example, along the axial direction of the power motor 100, the power motor 100 and the impeller 210 are respectively arranged on both sides of the radiator 300, that is, the radiator 300 is arranged between the power motor 100 and the impeller 210. The impeller 210 draws air toward the radiator 300, so that the fan 200 draws air on one side of the radiator 300 and discharges it from the exhaust side of the fan 200.

[0098] Exemplarily, the heat dissipation system further includes a drive motor 700, which is disposed on a side of the power motor 100 facing away from the propeller 22. The drive motor 700 is connected to the housing of the power motor 100 (e.g., it can be fixedly connected). The drive motor 700 is in transmission connection with the fan 200, and the drive motor 700 is used to drive the fan 200 to draw air into the radiator 300. Exemplarily, the drive motor 700 is in transmission connection with the impeller 210, and the drive motor 700 is used to drive the impeller 210 to rotate so that the impeller 210 draws air toward the radiator 300.

[0099] In some possible implementations, the radiator 300 is spaced apart from the power motor 100 along the axial direction of the power motor 100 , and a space is formed between the radiator 300 and the power motor 100 for airflow to enter the radiator 300 .

[0100] In this way, the air flow can enter the radiator 300 from the gap space formed between the radiator 300 and the power motor 100, which can reduce the impact of the power motor 100 on the air intake of the radiator 300, help increase the air intake volume of the radiator 300, and further improve the heat dissipation efficiency of the radiator 300.

[0101] In some other possible implementations, the airflow may also enter the radiator 300 through the side of the radiator 300 .

[0102] In some possible embodiments, along the axial direction of the power motor 100, on both sides of the drive motor 700, the fan 200 and the radiator 300, the radiator 300 and the drive motor 700 are spaced apart, and a space is formed between the radiator 300 and the drive motor 700 for airflow to enter the radiator 300.

[0103] In this way, the air flow can enter the radiator 300 from the gap space formed between the radiator 300 and the drive motor 700, which can reduce the impact of the drive motor 700 on the air intake of the radiator 300, help increase the air intake volume of the radiator 300, and further improve the heat dissipation efficiency of the radiator 300.

[0104] like Figure 2 As shown, in some possible embodiments, the heat dissipation system also includes a transmission shaft 710, one end of the transmission shaft 710 is connected to the output shaft of the drive motor 700, and the other end of the transmission shaft 710 passes through the radiator 300 and is connected to the fan 200, and the drive motor 700 is connected to the fan 200 through the transmission shaft 710, and the drive motor 700 is used to drive the fan 200 through the transmission shaft 710.

[0105] In this way, it is relatively easy to assemble the drive motor 700 on the housing of the power motor 100. In addition, the drive motor 700 is connected to the fan 200 by a transmission shaft 710 passing through the radiator 300, so that the drive motor 700 arranged on the housing of the power motor 100 drives the fan 200 located on the other side of the radiator 300.

[0106] The radiator 300 has a shaft hole for the transmission shaft 710 to pass through, and the transmission shaft 710 is disposed in the shaft hole.

[0107] Illustratively, the output shaft of the driving motor 700 , the transmission shaft 710 , and the fan 200 are coaxial.

[0108] In this way, the transmission connection between the drive motor 700 and the fan 200 is relatively simple, occupies less space, and is convenient for arrangement on the aircraft.

[0109] For example, the heat sink 300 may be perpendicular to the axial direction of the fan 200 .

[0110] Figure 3 A schematic diagram of another electric motor provided in an embodiment of the present application.

[0111] like Figure 3 As shown, in some other possible embodiments, the power motor 100 has a liquid cooling channel 110. The outlet end of the liquid cooling channel 110 is connected to the inlet end of the radiator 300, and the outlet end of the radiator 300 is connected to the inlet end of the liquid cooling channel 110. The liquid cooling channel 110 and the radiator 300 are used to form a cooling medium circulation loop.

[0112] In this way, it is easy to transfer the heat on the power motor 100 to the radiator 300. In addition, through liquid cooling, the heat dissipation efficiency of the power motor 100 is high, and the power motor 100 is not prone to overheating.

[0113] In some possible embodiments, the heat dissipation system further includes a liquid supply pipe 500 and a liquid return pipe 600. The outlet of the liquid-cooling channel 110 is connected to the inlet of the radiator 300 via the liquid return pipe 600, and the outlet of the radiator 300 is connected to the inlet of the liquid-cooling channel 110 via the liquid supply pipe 500. The liquid-cooling channel 110, the liquid return pipe 600, the radiator 300, and the liquid supply pipe 500 are used to form a cooling medium circulation loop.

[0114] In this way, it is easy to connect the radiator 300 spaced apart from the power motor 100 with the liquid cooling channel 110 of the power motor 100 .

[0115] In some possible implementations, the heat dissipation system further includes a liquid pump 400 , which is disposed on the cooling medium circulation loop and is used to drive the cooling medium to flow in the cooling medium circulation loop.

[0116] In this way, it is easy to drive the cooling medium in the cooling medium circulation loop. In addition, the flow rate of the cooling medium can also be controlled by the liquid pump 400 to match the heat dissipation demand of the power motor 100.

[0117] In some examples, the liquid pump 400 may be fixed to the housing of the power motor 100 . Of course, in other examples, the liquid pump 400 may also be disposed on the liquid supply pipe 500 or the liquid return pipe 600 .

[0118] Exemplarily, the outlet end of the radiator 300 is connected to the inlet end of the liquid pump 400 through the liquid supply pipe 500, and the outlet end of the liquid pump 400 is connected to the inlet end of the liquid cooling channel 110. The liquid cooling channel 110, the return liquid pipe 600, the radiator 300, the liquid supply pipe 500 and the liquid pump 400 are used to form a cooling medium circulation loop.

[0119] Figure 4 A schematic diagram of another electric motor provided in an embodiment of the present application.

[0120] like Figure 4 As shown, in some possible embodiments, at least one of the liquid supply pipe 500 and the liquid return pipe 600 is a rigid pipe, and the radiator 300 is rigidly connected to the housing of the power motor 100 through at least one of the liquid supply pipe 500 and the liquid return pipe 600.

[0121] In this way, the radiator 300 and the housing of the power motor 100 do not need to be fixed with other connecting structures, which is beneficial to the weight reduction and spatial layout of the aircraft. In addition, it can also reduce the obstruction of the air intake of the fan 200, which is beneficial to increase the air intake volume of the fan 200, and further improve the heat dissipation efficiency of the radiator 300.

[0122] Exemplarily, the liquid supply pipe 500 and the liquid return pipe 600 can both be rigid pipes, and the radiator 300 is rigidly connected to the housing of the power motor 100 through the liquid supply pipe 500 and the liquid return pipe 600, so as to achieve a relatively stable rigid connection between the radiator 300 and the housing of the power motor 100.

[0123] Exemplarily, the heat dissipation system may include multiple liquid supply pipes 500 and multiple liquid return pipes 600. The radiator 300 is fixedly connected to the housing of the power motor 100 via the multiple liquid supply pipes 500 and the multiple liquid return pipes 600, so that the radiator 300 is more firmly fixed to the housing of the power motor 100. In this case, the radiator 300 may include multiple outlet ports corresponding one-to-one with the liquid supply pipes 500 and multiple inlet ports corresponding one-to-one with the liquid return pipes 600. Each inlet port of the radiator 300 is connected to the outlet port of the liquid cooling channel 110 via a corresponding liquid return pipe 600, and each outlet port of the radiator 300 is connected to the inlet port of the liquid pump 400 via a corresponding liquid inlet pipe. For example, the heat dissipation system may include two liquid supply pipes 500 and two liquid return pipes 600. The two liquid supply pipes 500 and the two liquid return pipes 600 are evenly spaced along the circumference of the radiator 300, so that the radiator 300 is fixed more firmly. The liquid supply pipes 500 and the liquid return pipes 600 can be alternately arranged along the circumference of the radiator 300, so that the cooling medium can flow into the radiator 300 from two opposite positions on the radiator 300 and flow out of the radiator 300 from two opposite positions on the radiator 300, which is conducive to uniform heat dissipation of the radiator 300.

[0124] In some possible embodiments, the liquid pump 400 includes a pump rotor, the first output end of the drive motor 700 is transmission-connected to the pump rotor, the drive motor 700 is used to drive the pump rotor to rotate to drive the cooling medium to flow, and the second output end of the drive motor 700 is transmission-connected to the fan 200.

[0125] In this way, the fan 200 and the liquid pump 400 can be driven by the same drive motor 700. Compared with the fan 200 and the liquid pump 400 being driven by independent drive motors 700 respectively, the number of components set in the electric engine 21 can be reduced, which is beneficial to the weight reduction and space layout of the aircraft.

[0126] In some examples, the drive motor 700 is the pump motor of the liquid pump 400. That is, the liquid pump 400 includes the drive motor 700, or the drive motor 700 and the liquid pump 400 are integrated into one body. The fan 200 is driven by the pump motor of the liquid pump 400. In this case, the liquid pump 400 is fixed to the housing of the power motor 100, so that the fan 200 is connected to the pump motor of the liquid pump 400.

[0127] In this way, the fan 200, the pump rotor and the drive motor 700 are connected more easily, and it is also convenient to set the drive motor 700 on the housing of the power motor 100, and the components of the electric motor 21 are arranged more easily.

[0128] In some possible implementations, the fan 200 further includes a fan cover 220, which is disposed outside the impeller 210. The fan cover 220 can be fixedly disposed on the radiator 300. For example, the fan cover 220 can be fixedly connected to the radiator 300 via a connecting structure.

[0129] In some possible implementations, the fan 200 is an axial flow fan.

[0130] This facilitates blowing the air that has absorbed heat from the radiator 300 to a location away from the radiator 300, preventing the air from absorbing heat from the radiator 300 from flowing back to the radiator 300 and affecting the heat dissipation of the radiator 300. Furthermore, the blowing direction of the fan 200 is relatively consistent with the blowing direction of the propeller 22, which can reduce aerodynamic interference generated by the fan 200.

[0131] Figure 5 A schematic diagram of an impeller from one perspective provided in an embodiment of the present application, Figure 6 for Figure 5 A schematic diagram of another perspective of the impeller is provided in.

[0132] like Figure 5 、 Figure 6As shown, the impeller 210 includes blades 211 and a hub 212. The blades 211 are arranged on the hub 212. The drive motor 700 is connected to the hub 212 in a transmission manner. The drive motor 700 is used to drive the hub 212 to rotate, thereby driving the blades 211 to rotate. The rotating blades 211 are used to drive the air flow so that the impeller 210 draws air toward the radiator 300.

[0133] When the drive motor 700 is rotationally connected to the impeller 210 via the transmission shaft 710 , the drive motor 700 is transmission-connected to the hub 212 via the transmission shaft 710 . The output shaft of the drive motor 700 , the transmission shaft 710 , and the hub 212 may be coaxially arranged.

[0134] Exemplarily, the impeller 210 may include a plurality of blades 211 arranged along the circumference of the hub 212 .

[0135] Exemplarily, all the blades 211 are distributed at equal intervals along the circumference of the hub 212 .

[0136] The fan blade 211 includes a leading edge 2111, a trailing edge 2112, an outer periphery 2114 and an inner periphery 2113. The inner periphery 2113 is connected to the hub 212. One end of the leading edge 2111 is connected to the inner periphery 2113. The other end of the leading edge 2111 is connected to one end of the outer periphery 2114. The other end of the outer periphery 2114 is connected to one end of the trailing edge 2112. The other end of the trailing edge 2112 is connected to the other end of the inner periphery 2113.

[0137] Leading edge 2111 is the edge of blade 211 on the side closest to the air intake of fan 200; that is, leading edge 2111 is close to the air intake side of fan 200. Trailing edge 2112 is the edge of blade 211 on the side closest to the air discharge side of fan 200; that is, trailing edge 2112 is close to the air discharge side of fan 200. Outer peripheral edge 2114 is located on the side of blade 211 facing away from hub 212. When impeller 210 rotates, air is drawn into the space between two adjacent blades 211 from leading edge 2111 of blade 211. The air flowing into the space between two blades 211 is then forced out from trailing edge 2112 of blade 211.

[0138] The leading edge 2111 is located on one side of the rotation direction of the fan blade 211 , and the trailing edge 2112 is located on the side opposite to the rotation direction of the fan blade 211 .

[0139] Exemplarily, the trailing edge 2112 is an arc-shaped structure that is recessed toward the side opposite to the rotation direction of the fan blade 211 , and the trailing edge 2112 may have a relatively large curvature.

[0140] In this way, it is convenient to effectively control the airflow in the space between two adjacent fan blades 211, which is beneficial to increasing the wind speed of the wind blown out by the fan 200 and increasing the high-speed area of ​​the wind blown out by the fan 200, thereby increasing the airflow flowing through the radiator 300, so that the radiator 300 can have a better heat dissipation effect.

[0141] Exemplarily, the leading edge 2111 is an arc-shaped structure that is recessed toward the side opposite to the rotation direction of the fan blade 211 .

[0142] Illustratively, a surface of the fan blade 211 facing the exhaust side of the fan 200 is a curved surface structure.

[0143] Exemplarily, the trailing edge 2112 of the fan blade 211 may protrude from the opening of the fan cover 220 on the side away from the radiator 300. In other words, the edge of the fan blade 211 on the side away from the radiator 300 protrudes from the opening of the fan cover 220 on the side away from the radiator 300.

[0144] In this way, the fan cover 220 has little effect on the wind blown out by the impeller 210, which is conducive to increasing the air output of the impeller 210, and further helps to increase the airflow flowing through the radiator 300, so that the radiator 300 can have a better heat dissipation effect.

[0145] In some possible embodiments, the fan blade 211 includes a first structural portion 2115 and a second structural portion 2116 connected to each other, the first structural portion 2115 is close to the suction side of the fan 200, and the second structural portion 2116 is close to the exhaust side of the fan 200, and the thickness of the first structural portion 2115 is less than the thickness of the second structural portion 2116.

[0146] In this way, the first structural part 2115 is conducive to forming a wind-breaking structure, so that the resistance of the airflow being sucked into the space between the two adjacent fan blades 211 is relatively small, which can effectively improve the suction of the airflow between the radiator 300 and the fan 200, and is conducive to increasing the wind speed of the wind blown out by the fan 200 and increasing the high-speed area of ​​the wind blown out by the fan 200, thereby helping to increase the airflow flowing through the radiator 300, so that the radiator 300 can have a better heat dissipation effect.

[0147] The leading edge 2111 is located on one side of the first structure portion 2115 , the other side of the first structure portion 2115 is connected to one side of the second structure portion 2116 , and the trailing edge 2112 is located on the other side of the second structure portion 2116 .

[0148] In some possible implementations, the thickness of the first structure portion 2115 gradually increases from the first structure portion 2115 to the second structure portion 2116 , that is, from the leading edge to the trailing edge.

[0149] In this way, the resistance to the air flow being sucked into the space between two adjacent fan blades 211 is relatively small, which can effectively improve the suction of air between the radiator 300 and the fan 200, which is beneficial to increasing the wind speed of the wind blown out by the fan 200 and increasing the high-speed area of ​​the wind blown out by the fan 200, and further helping to increase the airflow flowing through the radiator 300, so that the radiator 300 can have a better heat dissipation effect.

[0150] In some possible embodiments, the first structural portion 2115 includes a suction surface 21151 , which is a side surface of the first structural portion 2115 facing the air suction side of the fan 200 . The suction surface 21151 is a planar structure perpendicular to the axial direction of the fan 200 .

[0151] This facilitates forming a structure in which the thickness of the first structural portion 2115 gradually increases from the first structural portion 2115 to the second structural portion 2116. This reduces resistance to airflow being drawn into the space between two adjacent blades 211, effectively improving the intake of air between the radiator 300 and the fan 200. This helps increase the speed of the air blown by the fan 200 and increases the high-speed region of the air blown by the fan 200, thereby increasing the airflow through the radiator 300 and achieving a better heat dissipation effect for the radiator 300. Furthermore, the planar structure has a minimal impact on the flow of air drawn between the two adjacent blades 211, facilitating the intake of air.

[0152] Illustratively, a surface of the second structure portion 2116 facing the air suction side of the fan 200 is a curved surface structure.

[0153] Figure 7 for Figure 5 A schematic diagram of another perspective of the impeller provided in FIG.

[0154] like Figure 7 As shown, and see Figure 5 、 Figure 6 In some possible implementations, a sharp angle structure 2117 protruding toward the rotation direction of the fan blade 211 is formed at the connection between the leading edge 2111 and the outer peripheral edge 2114 .

[0155] In this way, the pointed structure 2117 serves as a wind-breaking angle, which is beneficial to reducing the resistance between the leading edge 2111 and the airflow, and can make the resistance between the two adjacent fan blades 211 to be sucked into the airflow smaller, which can effectively improve the suction of the airflow between the radiator 300 and the fan 200, and is beneficial to increasing the wind speed of the wind blown out by the fan 200 and increasing the high-speed area of ​​the wind blown out by the fan 200, thereby helping to increase the airflow flowing through the radiator 300, so that the radiator 300 can have a better heat dissipation effect.

[0156] Figure 8 for Figure 5A schematic diagram of another perspective of the impeller provided in FIG.

[0157] like Figure 8 As shown, and see Figure 5-Figure 7 In some possible embodiments, the outlet angle a of the fan blade 211 is greater than or equal to 20° and less than or equal to 40°. The outlet angle a of the fan blade 211 is the angle between a tangent line of the exhaust-facing surface of the fan blade 211 at the trailing edge 2112 pointing away from the radiator 300 and the axial direction of the fan 200 pointing away from the radiator 300.

[0158] In this way, the airflow blown out by the fan 200 is conveniently gathered toward the middle area of ​​the fan 200, which is beneficial to increasing the wind speed of the wind blown out by the fan 200 and increasing the high-speed area of ​​the wind blown out by the fan 200, thereby increasing the airflow flowing through the radiator 300, so that the radiator 300 can have a better heat dissipation effect.

[0159] In some examples, the transition angle of blade 211 is greater than or equal to 110° and less than or equal to 40°. The transition angle of blade 211 is a smooth transition angle from a leading edge 2111 of blade 211 to a trailing edge 2112 of blade 211 .

[0160] In this way, the airflow blown out by the fan 200 is conveniently gathered toward the middle area of ​​the fan 200, which is beneficial to increasing the wind speed of the wind blown out by the fan 200 and increasing the high-speed area of ​​the wind blown out by the fan 200, thereby increasing the airflow flowing through the radiator 300, so that the radiator 300 can have a better heat dissipation effect.

[0161] Figure 9 This is a simulation diagram of the airflow field of an electric engine provided in an embodiment of the present application using an impeller in the prior art. Figure 10 An electric motor provided in the embodiment of the present application adopts Figure 5 The simulation diagram of the airflow field of the impeller in . Figure 9 、 Figure 10 As shown, using Figure 5 After the impeller 210 is provided, the wind blown out by the fan 200 is closer to the middle of the fan 200. The wind blown out by the fan 200 has a higher wind speed and a larger high-speed area. The airflow flowing through various parts of the radiator 300 is relatively balanced. The airflow flowing through the radiator 300 has a higher flow speed and a larger high-speed area, which makes the heat dissipation effect of the radiator 300 better.

[0162] In some possible embodiments, the radiator 300 has an air flow channel for air circulation. When the fan 200 sucks air, the air flow from the radiator 300 toward the power motor 100 passes through the spacing space, through the air flow channel and flows to the suction side of the fan 200 to dissipate heat from the radiator 300.

[0163] In this way, the airflow passing through the heat sink 300 can be utilized to achieve more efficient heat dissipation of the heat sink 300 .

[0164] Figure 11 This is a schematic diagram of a heat sink provided by an embodiment of the present application. In the figure, the x direction is a first direction, the y direction is a second direction, and the first direction is perpendicular to the second direction.

[0165] like Figure 11 As shown, in some possible embodiments, the heat sink 300 may include multiple heat dissipation flat tubes 320. The multiple heat dissipation flat tubes 320 are spaced apart, and airflow channels are formed between adjacent heat dissipation flat tubes 320. Both ends of each heat dissipation flat tube 320 are connected to the liquid cooling channel 110 to form a cooling medium circulation loop. The cooling medium flowing into the heat dissipation flat tubes 320 can be dissipated through the heat dissipation flat tubes 320. This facilitates heat dissipation of the cooling medium.

[0166] In some possible embodiments, the radiator 300 further includes a first manifold 310 and a second manifold 330. The first manifold 310 communicates with one end of the plurality of heat-dissipating flat tubes 320, while the second manifold 330 communicates with the other ends of the plurality of heat-dissipating flat tubes 320. The first manifold 310 and the second manifold 330 are in communication with the liquid-cooling channel 110. Thus, the first manifold 310 allows cooling medium to flow into and / or out of the radiator 300, while the second manifold 330 allows cooling medium to flow into and / or out of the radiator 300, facilitating both the flow of cooling medium into and out of the plurality of heat-dissipating flat tubes 320.

[0167] Illustratively, the first manifold 310 and the second manifold 330 are arranged opposite to each other in a first direction, and the first manifold 310 and the second manifold 330 are connected by a plurality of heat dissipation flat tubes 320 arranged therebetween, so as to realize compact connection of various parts of the radiator 300 .

[0168] Illustratively, the plurality of heat dissipation flat tubes 320 are arranged side by side along the second direction, so as to realize a compact arrangement of the plurality of heat dissipation flat tubes 320 .

[0169] Illustratively, the heat dissipation flat tubes 320 are straight tubes extending along the first direction.

[0170] For example, the first manifold 310 and the second manifold 330 are both arc-shaped tubes, with their ends connected to form a ring structure. Each of the heat dissipating flat tubes 320 is located within the ring structure. This allows each portion of the heat dissipating flat tubes 320 to have high heat dissipation efficiency, thereby improving the heat dissipation performance of the radiator 300 while reducing the space occupied by the radiator 300.

[0171] The inner arc surface of the first header 310 is opposite to the inner arc surface of the second header 330 .

[0172] Illustratively, the annular structure formed by connecting the first manifold 310 and the second manifold 330 has openings at both ends in the second direction, which helps to further reduce the size and weight of the radiator 300 .

[0173] Exemplarily, the radiator 300 further includes heat dissipation fins, and two adjacent heat dissipation flat tubes 320 are connected via the heat dissipation fins, so as to improve the heat dissipation efficiency of the radiator 300 .

[0174] In some possible embodiments, a first partition plate 311 is provided in the first collecting pipe 310, and the first partition plate 311 divides the first collecting pipe 310 into a first section 312 and a second section 313, so that the flow of the cooling medium in the first section 312 is not affected by the second section 313, and the flow of the cooling medium in the second section 313 is not affected by the first section 312, which is beneficial to improving the reliability of the radiator 300 or extending the heat dissipation path of the cooling medium in the radiator 300.

[0175] In some examples, a second partition plate 331 is provided in the second collecting pipe 330, and the second partition plate 331 divides the second collecting pipe 330 into a third section 332 and a fourth section 333, so that the flow of the cooling medium in the third section 332 is not affected by the fourth section 333, and the flow of the cooling medium in the fourth section 333 is not affected by the third section 332, which is beneficial to improving the reliability of the radiator 300 or extending the heat dissipation path of the cooling medium in the radiator 300.

[0176] In some examples where a first partition plate 311 is provided within the first manifold 310 and a second partition plate 331 is provided within the second manifold 330, one of the first section 312 and the third section 332 is provided with a first liquid inlet 341, and the other of the first section 312 and the third section 332 is provided with a first liquid outlet 342. A heat dissipation flat tube 320 is provided between the first section 312 and the third section 332, connecting the first section 312 and the third section 332 via the heat dissipation flat tube 320 provided therebetween.

[0177] The first section 312, the third section 332, and the heat dissipation flat tubes 320 connecting the first and third sections 312, 332 form a heat dissipation channel. The first liquid inlet 341 is the inlet end of the heat dissipation channel formed by the first section 312, the third section 332, and the heat dissipation flat tubes 320 connecting the first and third sections 312, 332. The first liquid outlet 342 is the outlet end of the heat dissipation channel formed by the first section 312, the third section 332, and the heat dissipation flat tubes 320 connecting the first and third sections 312, 332. The cooling medium flowing out of the outlet end of the liquid-cooling channel 110 can flow into the radiator 300 through the first liquid inlet 341. The cooling medium flowing into the radiator 300 through the first liquid inlet 341 flows through the first section 312, the third section 332, and the heat dissipation flat tube 320 connecting the first section 312 and the third section 332. After dissipating heat in the heat dissipation flat tube 320 connecting the first section 312 and the third section 332, it flows out of the radiator 300 through the first liquid outlet 342.

[0178] One of the second section 313 and the fourth section 333 has a second liquid inlet 343, and the other of the second section 313 and the fourth section 333 has a second liquid outlet 344. A heat dissipation flat tube 320 is provided between the second section 313 and the fourth section 333, connecting the second section 313 and the fourth section 333 via the heat dissipation flat tube 320 provided therebetween.

[0179] The second section 313, the fourth section 333, and the heat dissipation flat tubes 320 connecting the second and fourth sections 313, 333 form a heat dissipation channel. The second liquid inlet 343 serves as the inlet end of the heat dissipation channel formed by the second section 313, the fourth section 333, and the heat dissipation flat tubes 320 connecting the second and fourth sections 313, 333. The second liquid outlet 344 serves as the outlet end of the heat dissipation channel formed by the second section 313, the fourth section 333, and the heat dissipation flat tubes 320 connecting the second and fourth sections 313, 333. The cooling medium flowing out of the outlet end of the liquid-cooling channel 110 can flow into the radiator 300 through the second liquid inlet 343. The cooling medium flowing into the radiator 300 through the second liquid inlet 343 flows through the second section 313, the fourth section 333, and the heat dissipation flat tube 320 connecting the second section 313 and the fourth section 333. After dissipating heat in the heat dissipation flat tube 320 connecting the second section 313 and the fourth section 333, it flows out of the radiator 300 through the second liquid outlet 344.

[0180] This facilitates the formation of two independent heat dissipation channels. The cooling medium can be dissipated through at least two independent heat dissipation channels. A failure in one heat dissipation channel does not affect the operation of the other heat dissipation channels. The radiator 300 is less likely to stop dissipating heat, and the reliability of the radiator 300 is high. In addition, the structure of the radiator 300 with two independent heat dissipation channels is more compact.

[0181] The inlet end of the radiator 300 includes a first liquid inlet 341 and a second liquid inlet 343, and the outlet end of the radiator 300 includes a first liquid outlet 342 and a second liquid outlet 344. The first liquid inlet 341 is connected to the outlet end of the liquid-cooling channel 110 via a corresponding liquid return pipe 600, the first liquid outlet 342 is connected to the inlet end of the liquid-cooling channel 110 via a corresponding liquid supply pipe 500, the second liquid inlet 343 is connected to the outlet end of the liquid-cooling channel 110 via a corresponding liquid return pipe 600, and the second liquid outlet 344 is connected to the inlet end of the liquid-cooling channel 110 via a corresponding liquid supply pipe 500.

[0182] Exemplarily, the first partition plate 311 and the second partition plate 331 are opposite to each other in the first direction, the first section 312 and the third section 332 are opposite to each other in the first direction, and the second section 313 and the fourth section 333 are opposite to each other in the first direction. The cooling medium flowing in the heat dissipation channel formed by the first section 312, the third section 332, and the heat dissipation flat tubes 320 connecting the first section 312 and the third section 332 is relatively uniform compared with the cooling medium flowing in the heat dissipation channel formed by the second section 313, the fourth section 333, and the heat dissipation flat tubes 320 connecting the second section 313 and the fourth section 333.

[0183] In some examples, a third partition plate 3121 is provided in the first section 312, and the third partition plate 3121 divides the first section 312 into a first sub-segment 3122 and a second sub-segment 3123. The first liquid inlet 341 is located in the first sub-segment 3122. A fourth partition plate 3321 is provided in the third section 332, and the fourth partition plate 3321 divides the third section 332 into a third sub-segment 3322 and a fourth sub-segment 3323. The first liquid outlet 342 is located in the fourth sub-segment 3323.

[0184] A heat dissipation flat tube 320 is provided between the first sub-segment 3122 and the third sub-segment 3322. The first sub-segment 3122 and the third sub-segment 3322 are connected via the heat dissipation flat tube 320 provided therebetween. A heat dissipation flat tube 320 is provided between the third sub-segment 3322 and the second sub-segment 3123. The third sub-segment 3322 and the second sub-segment 3123 are connected via the heat dissipation flat tube 320 provided therebetween. A heat dissipation flat tube 320 is provided between the second sub-segment 3123 and the fourth sub-segment 3323. The second sub-segment 3123 and the fourth sub-segment 3323 are connected via the heat dissipation flat tube 320 provided therebetween.

[0185] The cooling medium flowing in from the first liquid inlet 341 enters the first sub-segment 3122, flows through the heat dissipation flat tubes 320 between the first sub-segment 3122 and the third sub-segment 3322 to the third sub-segment 3322, then flows through the heat dissipation flat tubes 320 between the third sub-segment 3322 and the second sub-segment 3123 to the second sub-segment 3123, then flows through the heat dissipation flat tubes 320 between the second sub-segment 3123 and the fourth sub-segment 3323 to the fourth sub-segment 3323, and finally flows out of the radiator 300 through the first liquid outlet 342.

[0186] In this way, while the structure of the radiator 300 is relatively compact, the heat dissipation path of the heat dissipation channel formed by the first section 312, the third section 332, and the heat dissipation flat tubes 320 connecting the first section 312 and the third section 332 can be made longer, thereby improving the heat dissipation effect on the cooling medium.

[0187] The second subsection 3123 is located between the first partition plate 311 and the first subsection 3122. The first liquid inlet 341 is located at the end of the first subsection 3122 facing away from the second partition plate 331. The fourth subsection 3323 is located between the second partition plate 331 and the third subsection 3322. The first liquid outlet 342 is located at the end of the fourth subsection 3323 closer to the fourth partition plate 3321. In the second direction, the third partition plate 3121 is located between the fourth partition plate 3321 and the first liquid inlet 341.

[0188] In some examples, a fifth partition plate 3131 is provided in the second section 313, the fifth partition plate 3131 divides the second section 313 into a fifth sub-segment 3132 and a sixth sub-segment 3133, the second liquid outlet 344 is located in the sixth sub-segment 3133, a sixth partition plate 3331 is provided in the fourth section 333, the sixth partition plate 3331 divides the fourth section 333 into a seventh sub-segment 3332 and an eighth sub-segment 3333, and the second liquid inlet 343 is located in the seventh sub-segment 3332.

[0189] A heat dissipation flat tube 320 is provided between the seventh subsegment 3332 and the fifth subsegment 3132. The seventh subsegment 3332 and the fifth subsegment 3132 are connected via the heat dissipation flat tube 320 provided therebetween. A heat dissipation flat tube 320 is provided between the fifth subsegment 3132 and the eighth subsegment 3333. The fifth subsegment 3132 and the eighth subsegment 3333 are connected via the heat dissipation flat tube 320 provided therebetween. A heat dissipation flat tube 320 is provided between the eighth subsegment 3333 and the sixth subsegment 3133. The eighth subsegment 3333 and the sixth subsegment 3133 are connected via the heat dissipation flat tube 320 provided therebetween.

[0190] The cooling medium flowing in through the second liquid inlet 343 enters the seventh sub-segment 3332, flows through the heat dissipation flat tubes 320 between the seventh sub-segment 3332 and the fifth sub-segment 3132 to the fifth sub-segment 3132, then flows through the heat dissipation flat tubes 320 between the fifth sub-segment 3132 and the eighth sub-segment 3333 to the eighth sub-segment 3333, then flows through the heat dissipation flat tubes 320 between the eighth sub-segment 3333 and the sixth sub-segment 3133 to the sixth sub-segment 3133, and finally flows out of the radiator 300 through the second liquid outlet 344.

[0191] In this way, while the structure of the radiator 300 is relatively compact, the heat dissipation path of the heat dissipation channel formed by the second section 313, the fourth section 333, and the heat dissipation flat tubes 320 connecting the second section 313 and the fourth section 333 can be made longer, thereby improving the heat dissipation effect on the cooling medium.

[0192] The sixth subsection 3133 is located between the first partition plate 311 and the fifth subsection 3132, and the second liquid outlet 344 is located at the end of the sixth subsection 3133 closest to the fifth partition plate 3131. The eighth subsection 3333 is located between the second partition plate 331 and the seventh subsection 3332, and the second liquid inlet 343 is located at the end of the seventh subsection 3332 facing away from the sixth partition plate 3331. In the second direction, the sixth partition plate 3331 is located between the fifth partition plate 3131 and the second liquid inlet 343.

[0193] In some examples where a first partition plate 311 is provided in the first collecting pipe 310 and a second partition plate 331 is not provided in the second collecting pipe 330, one of the first section 312 and the second section 313 is provided with a first liquid inlet 341, and the other of the first section 312 and the second section 313 is provided with a first liquid outlet 342, which can enable the cooling medium to have a heat dissipation path in the radiator 300, thereby achieving a better heat dissipation effect on the cooling medium.

[0194] In some examples where the first partition plate 311 is not provided in the first collecting pipe 310 and the second partition plate 331 is provided in the second collecting pipe 330, one of the third section 332 and the fourth section 333 is provided with a second liquid inlet 343, and the other of the third section 332 and the fourth section 333 is provided with a second liquid outlet 344, which can enable the cooling medium to have a heat dissipation path in the radiator 300, thereby achieving a better heat dissipation effect on the cooling medium.

[0195] In other possible embodiments, the inlet of the radiator 300 is located on the first manifold 310, and the outlet of the radiator 300 is located on the second manifold 330. After flowing through the inlet of the radiator 300 into the first manifold 310, the cooling medium flows into the heat dissipation flat tubes 320. Air driven by the fan 200 flows through the heat dissipation flat tubes 320 and the heat dissipation fins. The cooling medium in the heat dissipation flat tubes 320 can dissipate heat through the heat dissipation flat tubes 320 and the heat dissipation fins. After dissipating heat within the heat dissipation flat tubes 320, the cooling medium flows to the second manifold 330 and exits the radiator 300 through the outlet.

[0196] In the example where the heat sink 300 includes an axis-through hole for the transmission shaft 710 to pass through, the middle portion of at least one of the heat sink flat tubes 320 on either side of the center of the heat sink 300 can be bent in a second direction away from the center of the heat sink 300 to form an axis-through hole for circumventing the transmission shaft 710. In this manner, forming the axis-through hole for the transmission shaft 710 does not reduce the number of heat sink flat tubes 320, allowing the heat sink 300 to have a larger number of heat sink flat tubes 320, thereby improving heat dissipation performance and minimizing the impact on the heat dissipation performance of the heat sink 300 caused by the need to circumvent the axis-through hole for the transmission shaft 710.

[0197] In some other possible implementations, the radiator 300 may also be a radiator with a spiral disc structure. In this way, the radiator 300 can have a longer heat dissipation path and a better heat dissipation effect on the cooling medium based on the relatively compact structure of the radiator 300.

[0198] In some possible embodiments, the start and stop of the drive motor 700 can be controlled according to the temperature of the power motor 100. When the temperature of the power motor 100 reaches a preset temperature, the drive motor 700 starts. Exemplarily, the drive motor 700 is a variable frequency motor. The speed of the drive motor 700 can be controlled according to the temperature of the power motor 100 to control the speed of the fan 200 and the flow rate of the cooling medium. When the temperature of the power motor 100 is at a first preset value, the drive motor 700 is at a first speed. When the temperature of the power motor 100 is at a second preset value, the drive motor 700 is at a second speed. The first preset value is greater than the second preset value, and the first speed is greater than the second speed.

[0199] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A heat dissipation system, characterized in that: include: A heat sink (300), the heat sink (300) is used to dissipate heat from the target device, and the heat sink (300) has an air flow channel for air flow; A fan (200) is provided with an air suction side and an air discharge side along the axial direction of the fan (200), wherein the air suction side faces the radiator (300), and the fan (200) is used to suck air from the radiator (300) so that the air flow on one side of the radiator (300) flows through the air flow channel and is discharged from the air discharge side.

2. The heat dissipation system according to claim 1, characterized in that: The radiator (300) comprises a plurality of heat dissipation flat tubes (320), wherein the plurality of heat dissipation flat tubes (320) are arranged at intervals and the air flow channel is formed between two adjacent heat dissipation flat tubes (320); Both ends of each of the heat dissipation flat tubes (320) are connected to the liquid cooling channel (110) in the target device to form a cooling medium circulation loop.

3. The heat dissipation system according to claim 2, characterized in that: The radiator further comprises a first collecting pipe (310) and a second collecting pipe (330), wherein the first collecting pipe (310) is in communication with one end of the plurality of heat dissipation flat tubes (320), and the second collecting pipe (330) is in communication with the other end of the plurality of heat dissipation flat tubes (320); The first liquid collecting pipe (310) and the second liquid collecting pipe (330) are in communication with the liquid cooling channel (110).

4. The heat dissipation system according to claim 3, characterized in that: A first partition plate (311) is provided in the first liquid collecting pipe (310), and the first partition plate (311) divides the first liquid collecting pipe (310) into a first section (312) and a second section (313); and / or a second partition plate (331) is provided in the second liquid collecting pipe (330), and the second partition plate (331) divides the second liquid collecting pipe (330) into a third section (332) and a fourth section (333); One of the first section (312) and the second section (313) is provided with a first liquid inlet (341), and the other of the first section (312) and the second section (313) is provided with a first liquid outlet (342); Alternatively, one of the third section (332) and the fourth section (333) is provided with a second liquid inlet (343), and the other of the third section (332) and the fourth section (333) is provided with a second liquid outlet (344); Alternatively, one of the first section (312) and the third section (332) is provided with a first liquid inlet (341), the other of the first section (312) and the third section (332) is provided with a first liquid outlet (342), one of the second section (313) and the fourth section (333) is provided with a second liquid inlet (343), and the other of the second section (313) and the fourth section (333) is provided with a second liquid outlet (344).

5. The heat dissipation system according to claim 3, characterized in that: The first liquid collecting pipe (310) and the second liquid collecting pipe (330) are both arc-shaped pipes, and the two ends of the two arc-shaped pipes are connected to form an annular structure, and each of the heat dissipation flat pipes is located in the annular structure.

6. The heat dissipation system according to any one of claims 1 to 5, characterized in that: It also includes a liquid supply pipe (500) and a liquid return pipe (600); One end of the liquid return pipe (600) is in communication with the inlet end of the radiator (300), and the other end of the liquid return pipe (600) is used to communicate with the liquid cooling channel (110) of the target device; One end of the liquid supply pipe (500) is in communication with the outlet end of the radiator (300), and the other end of the liquid supply pipe (500) is used to communicate with the liquid cooling channel (110) of the target device; The liquid return pipe (600), the radiator (300) and the liquid supply pipe (500) are used to form a cooling medium circulation loop with the liquid cooling channel (110) of the target device; At least one of the liquid supply pipe (500) and the liquid return pipe (600) is a rigid pipe, and the radiator (300) is used to be rigidly connected to the target device through at least one of the liquid supply pipe (500) and the liquid return pipe (600); or both the liquid supply pipe (500) and the liquid return pipe (600) are rigid pipes, and there are multiple liquid supply pipes (500) and multiple liquid return pipes (600), and the radiator (300) is connected to the target device through multiple liquid supply pipes (500) and multiple liquid return pipes (600). The liquid return pipe (600) is rigidly connected to the target device, and the radiator (300) includes a plurality of outlet ends corresponding one-to-one to the liquid supply pipe (500), and a pair of inlet ends corresponding one-to-one to the liquid return pipe (600). Each inlet end of the radiator (300) is connected to the liquid cooling channel (110) through the corresponding liquid return pipe (600), and each outlet end of the radiator (300) is connected to the liquid cooling channel (110) through the corresponding liquid supply pipe (500).

7. The heat dissipation system according to any one of claims 1 to 5, characterized in that: Also includes a drive motor (700) and a transmission shaft (710); The driving motor (700) is used to be fixedly mounted on the target device, one end of the transmission shaft (710) is connected to the output shaft of the driving motor (700), and the other end of the transmission shaft (710) passes through the radiator (300) and is connected to the fan (200).

8. The heat dissipation system according to any one of claims 1 to 5, characterized in that: The fan (200) comprises a plurality of fan blades (211), and an air outlet angle (a) of the fan blades (211) is greater than or equal to 20° and less than or equal to 40°.

9. The heat dissipation system according to claim 8, characterized in that: The fan blade (211) includes a first structural portion (2115) and a second structural portion (2116) connected to each other, wherein the first structural portion (2115) is close to the air suction side, and the second structural portion (2116) is close to the air exhaust side, and the thickness of the first structural portion (2115) is less than the thickness of the second structural portion (2116); the thickness of the first structural portion (2115) gradually increases from the first structural portion (2115) to the second structural portion (2116); or the first structural portion (2115) includes a suction surface (21151), and the suction surface (21151) is a planar structure perpendicular to the axial direction of the fan (200).

10. The heat dissipation system according to claim 8, characterized in that: The fan (200) further includes a hub (212), and the fan blades (211) are arranged on the hub (212); The fan blade (211) includes a leading edge (2111) and an outer peripheral edge (2114), wherein the leading edge (2111) is close to the air suction side, and the outer peripheral edge (2114) is located on the side of the fan blade (211) facing away from the hub (212), and the leading edge (2111) is connected to the outer peripheral edge (2114), and a pointed angle structure (2117) protruding toward the rotation direction of the fan blade (211) is formed at the connection between the leading edge (2111) and the outer peripheral edge (2114).

11. An electric motor, characterized in that: The invention comprises a power motor (100) and a heat dissipation system according to any one of claims 1 to 10, wherein a radiator (300) of the heat dissipation system is used to dissipate heat from the power motor (100), and the power motor (100) and a fan (200) of the heat dissipation system are respectively located on both sides of the radiator (300); and the power motor (100) has a liquid cooling channel (110); The outlet end of the liquid cooling channel (110) is connected to the inlet end of the radiator (300), and the outlet end of the radiator (300) is connected to the inlet end of the liquid cooling channel (110). The liquid cooling channel (110) and the radiator (300) are used to form a cooling medium circulation loop.

12. An electric propulsion device (20), characterized in that comprising a propeller (22) and an electric motor (21) as claimed in claim 11; The propeller (22) is in transmission connection with the power motor (100) of the electric engine (21), and the power motor (100) is used to drive the propeller (22) to rotate.

13. An aircraft, characterized in that: comprising a fuselage (11), wings (12), a tail wing (13) and an electric propulsion device (20) as claimed in claim 12; The electric propulsion device (20) is arranged on the wing (12), and / or the fuselage (11), and / or the tail wing (13).

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