Electric engine, electric propulsion device and aircraft

Abstract

The present application provides an electric engine, an electric propulsion device and an aircraft, and relates to the field of aircraft technology. The electric engine includes a power motor, a radiator and a fan, and the radiator is used to dissipate heat from the power motor. Along the axial direction of the power motor, the fan and the power motor are respectively located on both sides of the radiator, and the fan has an air suction side and an air exhaust side, and the air suction side faces the radiator, so that the fan sucks air from one side of the radiator and discharges it from the air exhaust side. In this way, the heat dissipation efficiency of the power motor is high, which is conducive to ensuring the working performance of the power motor.

Description

Technical Field

[0001] The present application relates to the field of aircraft technology, and in particular to 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 device, which includes a propeller and an electric engine. The electric engine includes a power motor, which is connected to the propeller and used to drive the propeller to rotate. The heat generated by the power motor during operation is often dissipated by a radiator or a fan. In related fields, in order to improve the heat dissipation effect, the volume of the radiator or fan is increased or the distance between the radiator and the fan is increased to achieve the effect of improving the heat dissipation.

[0003] However, the increase in the size of the radiator or fan and the increase in the distance between the radiator and the fan often lead to an increase in the size of the equipment. However, the electric engine of the aircraft is relatively small, and the space for arranging the cooling system is often small. It is impossible to arrange a large radiator or fan in the related field, and it is impossible to increase the distance between the radiator and the fan. Therefore, how to ensure heat dissipation without increasing the size of the equipment is an urgent problem that needs to be solved. Summary of the invention

[0004] The present application aims to provide an electric engine, an electric propulsion device and an aircraft, which can achieve good heat dissipation effect for the power motor in a relatively small electric engine.

[0005] According to a first aspect of an embodiment of the present application, an electric engine is provided, the electric engine comprising:

[0006] Power motor;

[0007] A radiator, which is used to dissipate heat from the power motor;

[0008] The fan is arranged along the axis of the power motor, and the fan and the power motor are respectively arranged on both sides of the radiator, and the fan has an air suction side and an air exhaust side, and the air suction side faces the radiator so that the fan can suck the airflow on one side of the radiator and discharge it from the air exhaust side.

[0009] The electric engine provided in the embodiment of the present application dissipates heat from the radiator by causing the airflow at the radiator to be sucked away by a fan located on the side of the radiator away from the power motor. Since the airflow at the radiator is sucked into the radiator and then flows to the fan, the airflow sucked into the radiator is not likely to form turbulence due to the rebound of the heat dissipation structure, and the airflow on the air inlet side of the radiator is not likely to flow to the outer area of ​​the radiator due to being squeezed, which can make the air pressure at various places of the radiator more uniform, so that the airflow flowing through various places of the radiator is more uniform, and the heat dissipation at various places of the radiator is more balanced.

[0010] In addition, after the airflow passes through the radiator for heat exchange, the fan sucks away the airflow on the air outlet side of the radiator, making it less likely that the airflow flowing out of the radiator after heat exchange will flow back into the radiator.

[0011] In addition, the direction of the fan-driven airflow is relatively consistent with the direction of the propeller-driven airflow, which is conducive to the airflow passing through the radiator and also conducive to taking away the air flowing out from the air outlet side of the radiator. It is not easy for the airflow to pass through the radiator and the airflow flowing out from the air outlet side of the radiator to form turbulence and flow back into the radiator due to the direction of the fan-driven airflow being opposite to the direction of the propeller-driven airflow. The aerodynamic interference generated by the fan is also relatively small.

[0012] In summary, the solution provided in the embodiment of the present application has a high heat dissipation efficiency of the radiator, which is convenient for achieving a good heat dissipation effect on the power motor in a smaller electric engine, and is beneficial for ensuring the working performance of the power motor.

[0013] In a possible implementation, the radiator and the power motor are spaced apart along the axial direction of the power motor, and a spacing space is formed between the radiator and the power motor for airflow to enter the radiator.

[0014] In one possible implementation, the radiator has an air flow channel for air flow. When the fan sucks air, the air flow from the radiator toward the power motor side passes through the spacing space, through the air flow channel and flows to the suction side of the fan to dissipate heat from the radiator.

[0015] In a possible implementation, the power motor has a liquid cooling channel;

[0016] The outlet end of the liquid cooling channel is connected to the inlet end of the radiator, and the outlet end of the radiator is connected to the inlet end of the liquid cooling channel. The liquid cooling channel and the radiator are used to form a cooling medium circulation loop.

[0017] In a possible implementation, the radiator includes a plurality of heat dissipation flat tubes, the plurality of heat dissipation flat tubes are arranged at intervals and an air flow channel is formed between two adjacent heat dissipation flat tubes, and both ends of each heat dissipation flat tube are connected to the liquid cooling channel to form a cooling medium circulation loop.

[0018] In a possible implementation, the radiator further includes a first collecting pipe and a second collecting pipe, the first collecting pipe is connected to one end of the plurality of heat dissipating flat tubes, the second collecting pipe is connected to the other end of the plurality of heat dissipating flat tubes, and the first collecting pipe and the second collecting pipe are connected to the liquid cooling channel.

[0019] In one possible implementation, a first partition plate is provided in the first collecting tube, and the first partition plate divides the first collecting tube into a first section and a second section; and / or a second partition plate is provided in the second collecting tube, and the second partition plate divides the second collecting tube into a third section and a fourth section.

[0020] 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.

[0021] 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.

[0022] 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 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.

[0023] In a possible implementation, the first collecting tube and the second collecting tube are both arc-shaped tubes, two ends of the two arc-shaped tubes are connected to form an annular structure, and each heat dissipating flat tube is located in the annular structure.

[0024] In a possible implementation, the electric engine further includes a liquid supply pipe and a liquid return pipe;

[0025] The outlet end of the liquid cooling channel is connected to the inlet end of the radiator through a liquid return pipe, and the outlet end of the radiator is connected to the inlet end of the liquid cooling channel through a liquid supply pipe. The liquid cooling channel, the liquid return pipe, the radiator and the liquid supply pipe are used to form a cooling medium circulation loop;

[0026] 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 housing of the power motor through at least one of the liquid supply pipe and the liquid return pipe.

[0027] In one possible embodiment, both the liquid supply pipe and the liquid return pipe are rigid pipes, and there are multiple liquid supply pipes and multiple liquid return pipes. The radiator is rigidly connected to the housing of the power motor through the multiple liquid supply pipes and the multiple liquid return pipes. The radiator includes multiple outlet ends corresponding to the liquid supply pipes one by one, and a pair of inlet ends corresponding to the liquid return pipes one by one. 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.

[0028] In a possible implementation, the electric engine further includes a drive motor and a transmission shaft;

[0029] The driving motor is fixedly arranged on the housing of the power motor, one end of the transmission shaft is connected to the output shaft of the driving motor, and the other end of the transmission shaft passes through the radiator and is connected to the fan.

[0030] 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°.

[0031] In a possible implementation, the fan blade includes a first structure portion and a second structure portion that are connected, the first structure portion is close to the air suction side, the second structure portion is close to the air exhaust side, and the thickness of the first structure portion is less than the thickness of the second structure portion.

[0032] In a possible implementation manner, the thickness of the first structure portion gradually increases in a direction from the first structure portion to the second structure portion.

[0033] 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.

[0034] In a possible implementation, the fan further includes a hub, and the fan blade is arranged on the hub. The fan blade includes a leading edge and an outer peripheral edge, the leading edge is close to the air suction side, 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 sharp angle structure protruding in the rotation direction of the fan blade.

[0035] A second aspect of an embodiment 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;

[0036] The propeller is transmission-connected to the power motor of the electric engine, and the power motor is used to drive the propeller to rotate.

[0037] A third aspect of the embodiments of the present application provides an aircraft, the aircraft comprising a fuselage, wings, a tail, and an electric propulsion device in any one of the above embodiments;

[0038] The electric propulsion device is arranged on the wing, and / or the fuselage, and / or the tail. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] 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.

[0040] Figure 1 A schematic diagram of an aircraft provided in an embodiment of the present application;

[0041] Figure 2 A schematic diagram of an electric engine provided in an embodiment of the present application;

[0042] Figure 3 A schematic diagram of another electric engine provided in an embodiment of the present application;

[0043] Figure 4 A schematic diagram of another electric engine provided in an embodiment of the present application;

[0044] Figure 5 A schematic diagram of an impeller from one perspective provided in an embodiment of the present application;

[0045] Figure 6 for Figure 5 A schematic diagram of another perspective of the impeller provided in;

[0046] Figure 7 for Figure 5 A schematic diagram of another perspective of the impeller provided in;

[0047] Figure 8 for Figure 5 A schematic diagram of another perspective of the impeller provided in;

[0048] Fig. 9 A simulation diagram of an airflow field of an electric engine provided in an embodiment of the present application using an impeller in the prior art;

[0049] Fig.10 An electric motor provided in an embodiment of the present application adopts Figure 5 Simulation diagram of the airflow field of the impeller in ;

[0050] Fig.11A schematic diagram of a heat sink provided in an embodiment of the present application.

[0051] Description of reference numerals:

[0052] 11. Fuselage; 12. Wings; 13. Tail; 14. Arms; 15. Nacelle;

[0053] 20. Electric propulsion device; 20a. Fixed electric propulsion device; 20b. Tilting electric propulsion device; 21. Electric engine; 22. Propeller;

[0054] 100. power motor; 110. liquid cooling channel;

[0055] 200, fan;

[0056] 210, impeller; 211, blade; 2111, leading edge; 2112, trailing edge; 2113, inner peripheral edge; 2114, outer peripheral edge; 2115, first structural part; 21151, suction surface; 2116, second structural part; 2117, sharp angle structure; 212, hub;

[0057] 220, fan cover;

[0058] 300, radiator;

[0059] 310, first liquid collecting pipe; 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;

[0060] 320, heat dissipation flat tube;

[0061] 330, second liquid collecting pipe; 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;

[0062] 341, first liquid inlet; 342, first liquid outlet; 343, second liquid inlet; 344, second liquid outlet;

[0063] 400, liquid pump;

[0064] 500, liquid supply pipe;

[0065] 600, liquid return pipe;

[0066] 700, driving motor; 710, transmission shaft;

[0067] a. Wind angle. DETAILED DESCRIPTION

[0068] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0069] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0070] In this application, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be a connection between two elements or an interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0071] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature 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. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0072] In the above description, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means 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 the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0073] 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.

[0074] 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 on the specific structure and shape of the aircraft.

[0075] like Figure 1 As 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 structures and shapes 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 structure of the existing aircraft, and will not be repeated here. The tail 13 is fixedly arranged at the tail of the fuselage 11. The tail 13 is integrally formed or mechanically connected to the fuselage 11 and is a symmetrical structure. The structure of the tail 13 can also refer to the structure of the tail 13 of the existing aircraft, and will not be repeated here.

[0076] 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 .

[0077] 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 comprises eight electric propulsion devices 20 .

[0078] The electric propulsion device 20 is arranged on the fuselage 11 and / or the wing 12 and / or the tail 13, for example Figure 1As shown, electric propulsion devices 20 are symmetrically provided on the wings 12 and the tail 13. Of course, in some scenarios, the electric propulsion device 20 is provided on the fuselage 11, and the wing 12 and the tail 13 are not provided with electric propulsion devices 20. In other scenarios, the electric propulsion device 20 is provided on the wing 12, and the fuselage 11 and the tail 13 are not provided with electric propulsion devices 20. In still other scenarios, the electric propulsion device 20 is provided on the tail 13, and the fuselage 11 and the wing 12 are not provided with electric propulsion devices 20.

[0079] 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 the 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 one of the arm 14 and the nacelle 15.

[0080] In some embodiments, 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 the nacelle 15 (not shown in the figure).

[0081] In some embodiments, Figure 1 As shown, the electric propulsion device 20 is disposed on the tail 13 through the nacelle 15. In other embodiments, the electric propulsion device 20 may also be disposed on the tail 13 through the machine arm 14 (not shown in the figure).

[0082] 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 wing 12 , and the tail 13 .

[0083] In some examples, the electric propulsion device 20 installed on the aircraft may include a tilting electric propulsion device 20b, and a tilting mechanism is arranged between the tilting electric propulsion device 20b and any one of the fuselage 11, the wing 12 and the tail 13, and the tilting mechanism is used to adjust the tilt angle of the tilting electric propulsion device 20b.

[0084] In some examples, all electric propulsion devices 20 provided on the aircraft are fixed electric propulsion devices 20a.

[0085] In other examples, all the electric propulsion devices 20 provided on the aircraft are tilting electric propulsion devices 20b.

[0086] 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 1As 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.

[0087] In the embodiment of the present application, the electric propulsion device 20 includes a power battery (not shown in the figure), an electric engine 21 and a propeller 22. The electric engine 21 includes a power motor 100, a motor controller (not shown in the figure) and cables, etc., which can convert electrical energy into mechanical energy. In actual implementation, the electric engine 21 can also be called an electric propulsion system.

[0088] 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 with the propeller 22, and the electric engine 21 is used to drive the propeller 22 to rotate to provide power for the aircraft.

[0089] 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.

[0090] The propeller 22 may be disposed on one side of the power motor 100 , and the power motor 100 is transmission-connected to the propeller 22 , and the power motor 100 is used to drive the propeller 22 to rotate.

[0091] The embodiment of the present application also provides a heat dissipation system, which includes a heat sink 300. The heat sink 300 can be used to dissipate heat for a target device. For example, the target device can be a power motor 100, or other device that needs to dissipate heat. The embodiment of the present application takes the target device as a power motor 100 as an example for explanation.

[0092] In the embodiment of the present application, the electric motor 21 may include a heat dissipation system, which may be arranged on the side of the power motor 100 away from the propeller 22, and the radiator 300 may be used to dissipate heat from the power motor 100. The radiator 300 may be arranged on the housing of the power motor 100, and the heat on the power motor 100 may be transferred to the radiator 300.

[0093] The heat dissipation system further includes a fan 200 , which is disposed on a side of the power motor 100 away from the propeller 22 , and is used to dissipate heat from the radiator 300 .

[0094] Exemplarily, the fan 200 includes an impeller 210 , and the rotation of the impeller 210 causes the air at the radiator 300 to flow, thereby cooling the radiator 300 .

[0095] At present, many high-power heat-generating moving devices, such as the drive motors of new energy vehicles and the engines of fuel vehicles, generate a lot of heat during operation, so they are usually equipped with a cooling system (radiator and fan). The airflow generated by the fan blows through the radiator, thereby taking away the heat generated by the moving devices. For motors and engines such as automobiles, the heat dissipation is relatively spacious because of the structural layout and no rigid quality requirements. Therefore, in order to meet the heat dissipation requirements, there will not be too many restrictions on the size of the radiator and the size of the fan, and usually there will not be very tight and excessive shielding at the front of the radiator. In order to meet the requirements of weight and layout space, the current electric vertical take-off and landing aircraft usually requires the design of products to be small and precise, and to ensure the achievement of performance. In this way, the air inlet end of the radiator will be blocked by components such as the drive motor. This arrangement will inevitably cause new problems that do not occur in other industries, such as uneven distribution of the air inlet, which will seriously cause a large amount of heat reflux in the middle area of ​​the radiator.

[0096] Specifically, 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.

[0097] In the related art, 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, causing the space between the fan and the radiator to have a low air pressure in the middle area of ​​the fan and a high air pressure in the outer area of ​​the fan. 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 passes through the radiator and exchanges 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.

[0098] In the related field, in order to improve the heat dissipation effect, the volume of the radiator or fan is increased or the distance between the radiator and the fan is increased to achieve the effect of improving the heat dissipation. However, the increase in the volume of the radiator or fan and the increase in the distance between the radiator and the fan often leads to an increase in the volume of the equipment, but the electric engine of the aircraft is small in volume, and the space for arranging the heat dissipation system is often small, so it is impossible to arrange a large radiator or fan in the related field and it is impossible to increase the distance between the radiator and the fan.

[0099] 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.

[0100] In this way, the heat dissipation of the radiator 300 is performed by allowing the airflow at the radiator 300 to be sucked away by the fan 200 located on the side of the radiator 300 away from the power motor 100. Since the airflow at the radiator 300 is sucked into the radiator 300 and then flows to the fan 200, the airflow sucked into the radiator 300 is not easy to form turbulence due to the rebound of the heat dissipation structure of the radiator 300, and the airflow on the air inlet side of the radiator 300 is not easy to flow to the outer area of ​​the radiator 300 due to being squeezed, so that the air pressure at various places of the radiator 300 is relatively uniform, so that the airflow flowing through various places of the radiator 300 is relatively uniform, and the heat dissipation at various places of the radiator 300 is relatively balanced. In addition, after the airflow flows through the radiator 300 for heat exchange, the fan 200 sucks away the airflow on the air outlet side of the radiator 300, and it is not easy for the airflow flowing out of the radiator 300 after heat exchange from the radiator 300 to 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 from the air outlet side of the radiator 300. It is not easy to affect the airflow passing through the radiator 300 due to the direction of the airflow driven by the fan 200 being opposite to the direction of the airflow driven by the propeller 22, and the airflow flowing out from the air outlet side of the radiator 300 is not easily turbulent and flows back into the radiator 300. The aerodynamic interference generated by the fan 200 is also small. In summary, the solution provided by the embodiment of the present application has a high heat dissipation efficiency of the radiator 300, which is convenient for achieving a good heat dissipation effect on the power motor 100 in the electric engine 21 with a smaller volume, and is conducive to ensuring the working performance of the power motor 100.

[0101] Exemplarily, 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 from one side of the radiator 300 and discharges it from the exhaust side of the fan 200.

[0102] Exemplarily, the heat dissipation system further includes a drive motor 700, which is disposed on a side of the power motor 100 away from the propeller 22, and is connected to the housing of the power motor 100 (for example, it can be fixedly connected), and the drive motor 700 is transmission-connected to the fan 200, and the drive motor 700 is used to drive the fan 200 to suck air from the radiator 300. Exemplarily, the drive motor 700 is transmission-connected to the impeller 210, and the drive motor 700 is used to drive the impeller 210 to rotate so that the impeller 210 sucks air toward the radiator 300.

[0103] 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 spacing space is formed between the radiator 300 and the power motor 100 for airflow to enter the radiator 300 .

[0104] In this way, the airflow 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 of the radiator 300, and further improve the heat dissipation efficiency of the radiator 300.

[0105] In some other possible implementations, the airflow may also enter the radiator 300 through the side of the radiator 300 .

[0106] 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 spacing space is formed between the radiator 300 and the drive motor 700 for airflow to enter the radiator 300 .

[0107] In this way, the airflow 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 of the radiator 300, and further improve the heat dissipation efficiency of the radiator 300.

[0108] like Figure 2As 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. The drive motor 700 is transmission-connected to the fan 200 via the transmission shaft 710, and the drive motor 700 is used to drive the fan 200 via the transmission shaft 710.

[0109] 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.

[0110] The heat sink 300 has a shaft hole for the transmission shaft 710 to pass through, and the transmission shaft 710 is inserted into the shaft hole.

[0111] Exemplarily, the output shaft of the driving motor 700 , the transmission shaft 710 , and the fan 200 are coaxial.

[0112] 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.

[0113] Exemplarily, the heat sink 300 may be perpendicular to the axial direction of the fan 200 .

[0114] Figure 3 A schematic diagram of another electric motor provided in an embodiment of the present application.

[0115] 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.

[0116] In this way, it is convenient to transfer the heat on the power motor 100 to the radiator 300. In addition, the heat dissipation efficiency of the power motor 100 is high through liquid cooling, and the power motor 100 is not prone to overheating.

[0117] In some possible implementations, the heat dissipation system further includes a liquid supply pipe 500 and a liquid return pipe 600. The outlet end of the liquid cooling channel 110 is connected to the inlet end of the radiator 300 through the liquid return pipe 600, and the outlet end of the radiator 300 is connected to the inlet end of the liquid cooling channel 110 through 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.

[0118] 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 .

[0119] 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.

[0120] 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.

[0121] In some examples, the liquid pump 400 may be fixed on 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 .

[0122] 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.

[0123] Figure 4 A schematic diagram of another electric motor provided in an embodiment of the present application.

[0124] like Figure 4 As shown, in some possible implementations, 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.

[0125] In this way, the fixing of the radiator 300 and the housing of the power motor 100 does not need to be provided with other connection structures, which is beneficial to the weight reduction and space 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 of the fan 200, and further help to improve the heat dissipation efficiency of the radiator 300.

[0126] 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.

[0127] Exemplarily, the heat dissipation system may include a plurality of liquid supply pipes 500 and a plurality of liquid return pipes 600, and the radiator 300 is fixedly connected to the housing of the power motor 100 through the plurality of liquid supply pipes 500 and the plurality of liquid return pipes 600, so that the radiator 300 is fixedly connected to the housing of the power motor 100 more firmly. In this case, the radiator 300 may include a plurality of outlet ends corresponding to the liquid supply pipes 500 one by one, and a plurality of inlet ends corresponding to the liquid return pipes 600 one by one, and each inlet end of the radiator 300 is connected to the outlet end of the liquid cooling channel 110 through a corresponding liquid return pipe 600, and each outlet end of the radiator 300 is connected to the inlet end of the liquid pump 400 through a corresponding liquid inlet pipe. For example, the heat dissipation system may include two liquid supply pipes 500 and two liquid return pipes 600, and 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 beneficial to uniform heat dissipation of the radiator 300.

[0128] In some possible embodiments, the liquid pump 400 includes a pump rotor, and 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.

[0129] 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.

[0130] In some examples, the drive motor 700 is a pump motor of the liquid pump 400, that is, the liquid pump 400 includes the drive motor 700, or the drive motor 700 is integrated with the liquid pump 400. The fan 200 is driven by the pump motor of the liquid pump 400. At this time, 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.

[0131] In this way, the fan 200, the pump rotor and the drive motor 700 are easily connected, and it is also convenient to set the drive motor 700 on the housing of the power motor 100, and the arrangement of the components of the electric motor 21 is easier.

[0132] In some possible implementations, the fan 200 further includes a fan cover 220, which is disposed on the outer side of the impeller 210, and the fan cover 220 can be fixedly disposed on the radiator 300. Exemplarily, the fan cover 220 can be fixedly connected to the radiator 300 via a connection structure.

[0133] In some possible implementations, the fan 200 is an axial flow fan.

[0134] In this way, the air that has absorbed the heat of the radiator 300 is easily blown to a position away from the radiator 300, so that the air that has absorbed the heat of the radiator 300 is not easy to flow back to the radiator 300 and affect the heat dissipation of the radiator 300. In addition, the blowing direction of the fan 200 is relatively consistent with the blowing direction of the propeller 22, which can reduce the aerodynamic interference generated by the fan 200.

[0135] 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 FIG.

[0136] like Figure 5 , Figure 6 As 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 transmission-connected to the hub 212. 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.

[0137] 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 , and the output shaft of the drive motor 700 , the transmission shaft 710 , and the hub 212 may be coaxially arranged.

[0138] Exemplarily, the impeller 210 may include a plurality of blades 211 arranged along the circumference of the hub 212 .

[0139] Exemplarily, all the blades 211 are evenly spaced along the circumference of the hub 212 .

[0140] 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, and the other end of the trailing edge 2112 is connected to the other end of the inner periphery 2113.

[0141] The leading edge 2111 is the edge of the blade 211 on the side close to the air suction side of the fan 200, that is, the leading edge 2111 is close to the air suction side of the fan 200. The trailing edge 2112 is the edge of the blade 211 on the side close to the air discharge side of the fan 200, that is, the trailing edge 2112 is close to the air discharge side of the fan 200. The outer peripheral edge 2114 is located on the side of the blade 211 away from the hub 212. When the impeller 210 rotates, the airflow is sucked into the space between two adjacent blades 211 from the leading edge 2111 of the blade 211, and the airflow flowing into the space between the two blades 211 is pressed out from the trailing edge 2112 of the blade 211.

[0142] 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 .

[0143] 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.

[0144] 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 by the fan 200 and increasing the high-speed area of ​​the wind blown by the fan 200, thereby facilitating increasing the airflow flowing through the radiator 300, so that the radiator 300 can have a better heat dissipation effect.

[0145] 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 .

[0146] Exemplarily, a surface of the fan blade 211 facing the exhaust side of the fan 200 is a curved structure.

[0147] Exemplarily, the trailing edge 2112 of the 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 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.

[0148] In this way, the fan cover 220 has less influence on the wind blown out by the impeller 210, which is beneficial to increase 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.

[0149] In some possible embodiments, the fan blade 211 includes a first structural portion 2115 and a second structural portion 2116 that are connected, the first structural portion 2115 is close to the air intake side of the fan 200, and the second structural portion 2116 is close to the air 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.

[0150] 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 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 help to increase the wind speed of the wind blown by the fan 200 and increase the high-speed area of ​​the wind blown 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.

[0151] 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 .

[0152] In some possible implementations, the thickness of the first structure portion 2115 gradually increases in a direction from the first structure portion 2115 to the second structure portion 2116 , that is, in a direction from the leading edge to the trailing edge.

[0153] 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, and is beneficial to increasing the wind speed of the wind blown by the fan 200 and increasing the high-speed area of ​​the wind blown 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.

[0154] In some possible implementations, the first structure portion 2115 includes a suction surface 21151 , which is a side surface of the first structure portion 2115 facing the air suction side of the fan 200 , and the suction surface 21151 is a planar structure perpendicular to the axial direction of the fan 200 .

[0155] In this way, it is convenient to form a structure in which the thickness of the first structure part 2115 gradually increases in the direction from the first structure part 2115 to the second structure part 2116, so that the resistance of the airflow being sucked into the space between the two adjacent fan blades 211 is small, which can effectively improve the suction of air between the radiator 300 and the fan 200, which is conducive to increasing the wind speed of the wind blown by the fan 200 and increasing the high-speed area of ​​the wind blown by the fan 200, thereby facilitating the increase of the airflow flowing through the radiator 300, so that the radiator 300 can have a better heat dissipation effect. In addition, the planar structure has little effect on the flow of the airflow sucked between the two adjacent fan blades 211, which is conducive to the suction of the airflow.

[0156] Exemplarily, a surface of the second structure portion 2116 facing the air suction side of the fan 200 is a curved structure.

[0157] Figure 7 for Figure 5 A schematic diagram of another perspective of the impeller provided in FIG.

[0158] 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 .

[0159] 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 by the fan 200 and increasing the high-speed area of ​​the wind blown 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.

[0160] Figure 8 for Figure 5 A schematic diagram of another perspective of the impeller provided in FIG.

[0161] like Figure 8 As shown, and see Figure 5-Figure 7 In some possible implementations, 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 the tangent line of the surface of the fan blade 211 facing the exhaust side 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.

[0162] In this way, the airflow blown by the fan 200 is convenient to gather toward the middle area of ​​the fan 200, which is beneficial to increase the wind speed of the wind blown by the fan 200 and increase the high-speed area of ​​the wind blown 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.

[0163] In some examples, the transition angle of the blade 211 is greater than or equal to 110° and less than or equal to 40°. The transition angle of the blade 211 is a smooth transition angle from the leading edge 2111 of the blade 211 to the trailing edge 2112 of the blade 211 .

[0164] In this way, the airflow blown by the fan 200 is convenient to gather toward the middle area of ​​the fan 200, which is beneficial to increase the wind speed of the wind blown by the fan 200 and increase the high-speed area of ​​the wind blown 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.

[0165] Fig. 9A 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, Fig.10 An electric motor provided in an embodiment of the present application adopts Figure 5 The simulation diagram of the airflow field of the impeller in FIG. Fig. 9 , Fig.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 more balanced, the airflow flowing through the radiator 300 has a higher flow rate and a larger high-speed area, so that the heat dissipation effect of the radiator 300 is better.

[0166] In some possible embodiments, the radiator 300 has an air flow channel for air flow. When the fan 200 sucks air, the air flow from the radiator 300 toward the power motor 100 passes through the spacing space, passes through the air flow channel and flows to the suction side of the fan 200 to dissipate heat from the radiator 300.

[0167] In this way, the airflow passing through the heat sink 300 can be used to achieve more efficient heat dissipation of the heat sink 300 .

[0168] Fig.11 A schematic diagram of a heat sink provided in 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.

[0169] like Fig.11 As shown, in some possible implementations, the radiator 300 may include a plurality of heat dissipation flat tubes 320, and the plurality of heat dissipation flat tubes 320 are arranged at intervals and an air flow channel is formed between two 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, and the cooling medium flowing into the heat dissipation flat tube 320 can be radiated through the heat dissipation flat tube 320. In this way, the heat dissipation of the cooling medium is easily achieved.

[0170] In some possible implementations, the radiator 300 further includes a first manifold 310 and a second manifold 330. The first manifold 310 is in communication with one end of the plurality of heat dissipation flat tubes 320, the second manifold 330 is in communication with the other end of the plurality of heat dissipation flat tubes 320, and the first manifold 310 and the second manifold 330 are in communication with the liquid cooling channel 110. In this way, the first manifold 310 can allow the cooling medium to flow into and / or out of the radiator 300, and the second manifold 330 can allow the cooling medium to flow into and / or out of the radiator 300, so as to facilitate the cooling medium to flow into the plurality of heat dissipation flat tubes 320 and the cooling medium in the plurality of heat dissipation flat tubes 320 to flow out.

[0171] Exemplarily, 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 .

[0172] Exemplarily, 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 .

[0173] Exemplarily, the heat dissipation flat tube 320 is a straight tube extending along the first direction.

[0174] For example, the first liquid collecting tube 310 and the second liquid collecting tube 330 are both arc-shaped tubes, and the two ends of the two arc-shaped tubes are connected to form an annular structure, and each heat dissipation flat tube 320 is located in the annular structure. In this way, each part of the heat dissipation flat tube 320 can have a high heat dissipation efficiency, and the heat dissipation performance of the heat dissipator 300 can be better, and the space occupied by the heat dissipator 300 can be smaller.

[0175] The inner arc surface of the first header 310 is opposite to the inner arc surface of the second header 330 .

[0176] Exemplarily, 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 is beneficial to further reduce the size and weight of the radiator 300 .

[0177] 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 .

[0178] 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.

[0179] 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.

[0180] In some examples where the first partition plate 311 is provided in the first manifold 310 and the second partition plate 331 is provided in 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, and the first section 312 and the third section 332 are connected via the heat dissipation flat tube 320 provided therebetween.

[0181] 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 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 tube 320 connecting the first section 312 and the third section 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 tube 320 connecting the first section 312 and the third section 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.

[0182] 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. A heat dissipation flat tube 320 is provided between the second section 313 and the fourth section 333, and the second section 313 and the fourth section 333 are connected via the heat dissipation flat tube 320 provided therebetween.

[0183] 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 form a heat dissipation channel. The second liquid inlet 343 is the inlet end of the heat dissipation channel formed by 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. The second liquid outlet 344 is the outlet end of the heat dissipation channel formed by 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. 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 the 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.

[0184] In this way, two independent heat dissipation channels are formed, and the cooling medium can dissipate heat through at least two independent heat dissipation channels. The failure of one heat dissipation channel does not affect the operation of other heat dissipation channels, and the heat sink 300 is unlikely to stop dissipating heat, and the reliability of the heat sink 300 is high. In addition, the structure of the heat sink 300 with two independent heat dissipation channels can be made more compact.

[0185] 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 through a corresponding liquid return pipe 600, the first liquid outlet 342 is connected to the inlet end of the liquid cooling channel 110 through a corresponding liquid supply pipe 500, the second liquid inlet 343 is connected to the outlet end of the liquid cooling channel 110 through a corresponding liquid return pipe 600, and the second liquid outlet 344 is connected to the inlet end of the liquid cooling channel 110 through a corresponding liquid supply pipe 500.

[0186] 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 more uniform than 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.

[0187] 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.

[0188] A heat dissipation flat tube 320 is provided between the first sub-segment 3122 and the third sub-segment 3322, and 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, and 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, and the second sub-segment 3123 and the fourth sub-segment 3323 are connected via the heat dissipation flat tube 320 provided therebetween.

[0189] After the cooling medium flows in from the first liquid inlet 341 and enters the first sub-segment 3122, it flows to the third sub-segment 3322 through the heat dissipation flat tubes 320 between the first sub-segment 3122 and the third sub-segment 3322, then flows to the second sub-segment 3123 through the heat dissipation flat tubes 320 between the third sub-segment 3322 and the second sub-segment 3123, then flows to the fourth sub-segment 3323 through the heat dissipation flat tubes 320 between the second sub-segment 3123 and the fourth sub-segment 3323, and finally flows out of the radiator 300 from the first liquid outlet 342.

[0190] In this way, the heat dissipation path of the heat dissipation channel formed by 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 can be made longer on the basis of the relatively compact structure of the radiator 300, thereby achieving a better heat dissipation effect on the cooling medium.

[0191] 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 one end of the first subsection 3122 away from the second partition plate 331, the fourth subsection 3323 is located between the second partition plate 331 and the third subsection 3322, and the first liquid outlet 342 is located at one end of the fourth subsection 3323 close 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.

[0192] 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 at 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 at the seventh sub-segment 3332.

[0193] A heat dissipation flat tube 320 is provided between the seventh sub-segment 3332 and the fifth sub-segment 3132, the seventh sub-segment 3332 is connected to the fifth sub-segment 3132 via the heat dissipation flat tube 320 provided therebetween, a heat dissipation flat tube 320 is provided between the fifth sub-segment 3132 and the eighth sub-segment 3333, the fifth sub-segment 3132 and the eighth sub-segment 3333 are connected via the heat dissipation flat tube 320 provided therebetween, a heat dissipation flat tube 320 is provided between the eighth sub-segment 3333 and the sixth sub-segment 3133, and the eighth sub-segment 3333 is connected to the sixth sub-segment 3133 via the heat dissipation flat tube 320 provided therebetween.

[0194] After the cooling medium flows in from the second liquid inlet 343 and enters the seventh sub-segment 3332, it flows to the fifth sub-segment 3132 through the heat dissipation flat tubes 320 between the seventh sub-segment 3332 and the fifth sub-segment 3132, then flows to the eighth sub-segment 3333 through the heat dissipation flat tubes 320 between the fifth sub-segment 3132 and the eighth sub-segment 3333, then flows to the sixth sub-segment 3133 through the heat dissipation flat tubes 320 between the eighth sub-segment 3333 and the sixth sub-segment 3133, and finally flows out of the radiator 300 from the second liquid outlet 344.

[0195] In this way, the heat dissipation path of the heat dissipation channel formed by 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 can be made longer on the basis of the relatively compact structure of the radiator 300, thereby achieving a better heat dissipation effect on the cooling medium.

[0196] 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 one end of the sixth subsection 3133 close 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 one end of the seventh subsection 3332 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.

[0197] In some examples in which the first partition plate 311 is provided in the first collecting tube 310 and the second partition plate 331 is not provided in the second collecting tube 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.

[0198] In some examples where the first partition plate 311 is not provided in the first collecting tube 310 and the second partition plate 331 is provided in the second collecting tube 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.

[0199] In some other possible implementations, the inlet end of the radiator 300 is located on the first manifold 310, and the outlet end of the radiator 300 is located on the second manifold 330. After the cooling medium flows into the first manifold 310 through the inlet end of the radiator 300, it flows into the heat dissipation flat tubes 320, and the wind 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 the cooling medium dissipates heat in the heat dissipation flat tubes 320, it flows to the second manifold 330 and flows out of the radiator 300 through the outlet end of the radiator 300.

[0200] In the example where the radiator 300 has an axis-through hole for the transmission shaft 710 to pass through, the middle of at least one heat dissipation flat tube 320 on both sides of the center position of the radiator 300 can be bent along the second direction toward a direction away from the center of the radiator 300 to form an axis-through hole for avoiding the transmission shaft 710. In this way, the axis-through hole for the transmission shaft 710 to pass through can be formed without reducing the number of heat dissipation flat tubes 320, so that the number of heat dissipation flat tubes 320 of the radiator 300 is large, the heat dissipation performance is better, and the influence on the heat dissipation performance of the radiator 300 due to the need to avoid the axis-through hole for the transmission shaft 710 to pass through can be reduced.

[0201] In some other possible implementations, the radiator 300 may also be a radiator in 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 on the basis of a relatively compact structure of the radiator 300.

[0202] In some possible implementations, 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.

[0203] 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 it. 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 replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An electric motor (21), characterized in that: include: Power motor (100); A radiator (300), the radiator (300) being used to dissipate heat from the power motor (100), and the radiator (300) being provided with an air flow channel for air flow; A fan (200) is provided. 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 discharge side. The air suction side faces the radiator (300), so that the fan (200) can suck air from one side of the radiator (300), and the air flow passes through the air flow channel and is discharged from the air discharge side.

2. The electric motor (21) according to claim 1, characterized in that Along the axial direction of the power motor (100), the radiator (300) and the power motor (100) are arranged at a distance, and a spacing space is formed between the radiator (300) and the power motor (100) for airflow to enter the radiator (300).

3. The electric motor (21) according to claim 2, characterized in that When the fan (200) sucks air, the airflow from the radiator (300) toward the power motor (100) passes through the spacing space, through the airflow channel, and flows toward the air suction side of the fan (200) to dissipate heat from the radiator (300).

4. The electric motor (21) according to claim 3, characterized in that 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.

5. The electric motor (21) according to claim 4, characterized in that The radiator (300) comprises a plurality of heat dissipation flat tubes (320), the plurality of heat dissipation flat tubes (320) are arranged at intervals and an 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) to form a cooling medium circulation loop; The radiator (300) further comprises a first liquid collecting pipe (310) and a second liquid collecting pipe (330), wherein the first liquid collecting pipe (310) is connected to one end of the plurality of heat dissipation flat tubes (320), and the second liquid collecting pipe (330) is connected to 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).

6. The electric motor (21) according to claim 5, 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).

7. The electric motor (21) according to claim 6, characterized in that When a first partition plate (311) is provided in the first liquid collecting pipe (310), and a second partition plate (331) is provided in the second liquid collecting pipe (330): 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 subsection (3122) and a second subsection (3123); the first liquid inlet (341) is located in the first subsection (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 subsection (3322) and a fourth subsection (3323); the first liquid outlet (342) is located in the fourth subsection (3323); And / or, a fifth partition plate (3131) is provided in the second section (313), and the fifth partition plate (3131) divides the second section (313) into a fifth sub-section (3132) and a sixth sub-section (3133), and the second liquid outlet (344) is located in the sixth sub-section (3133), and a sixth partition plate (3331) is provided in the fourth section (333), and the sixth partition plate (3331) divides the fourth section (333) into a seventh sub-section (3332) and an eighth sub-section (3333), and the second liquid inlet (343) is located in the seventh sub-section (3332).

8. The electric motor (21) according to any one of claims 5 to 7, characterized in that: The first liquid collecting tube (310) and the second liquid collecting tube (330) are both arc-shaped tubes, and the two ends of the two arc-shaped tubes are connected to form an annular structure, and each of the heat dissipation flat tubes (320) is located in the annular structure.

9. The electric motor (21) according to any one of claims 4 to 7, characterized in that: It also includes a liquid supply pipe (500) and a liquid return pipe (600); The outlet end of the liquid cooling channel (110) is connected to the inlet end of the radiator (300) through the liquid return pipe (600), and the outlet end of the radiator (300) is connected to the inlet end of the liquid cooling channel (110) through 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; 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); or both the liquid supply pipe (500) and the liquid return pipe (600) are rigid pipes, and there are a plurality of the liquid supply pipes (500) and the liquid return pipe (600), and the radiator (300) is connected to the housing of the power motor (100) through a plurality of the liquid supply pipes (500) and a plurality of the liquid return pipes (600). The liquid pipe (600) is rigidly connected to the housing of the power motor (100); 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).

10. The electric engine (21) according to any one of claims 1 to 7, characterized in that: Also includes a driving motor (700) and a transmission shaft (710); The drive motor (700) is fixedly arranged on the housing of the power motor (100), 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).

11. The electric motor (21) according to any one of claims 1 to 7, 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°.

12. The electric motor (21) according to claim 11, characterized in that The fan blade (211) includes a first structural portion (2115) and a second structural portion (2116) which are connected to each other. 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. The thickness of the first structural portion (2115) is smaller than the thickness of the second structural portion (2116). In the direction from the first structural portion (2115) to the second structural portion (2116), the thickness of the first structural portion (2115) gradually increases.

13. The electric motor (21) according to claim 12, characterized in that 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).

14. The electric motor (21) according to claim 11, characterized in that The fan (200) further comprises a hub (212), and the fan blades (211) are arranged on the hub (212); The fan blade (211) comprises a leading edge (2111) and an outer peripheral edge (2114), wherein the leading edge (2111) is close to the wind 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 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).

15. An electric propulsion device (20), characterized in that: comprising a propeller (22) and an electric motor (21) according to any one of claims 1 to 14; The propeller (22) is drivingly connected to the power motor (100) of the electric engine (21), and the power motor (100) is used to drive the propeller (22) to rotate.

16. An aircraft, characterized in that: It comprises a fuselage (11), wings (12), a tail wing (13) and an electric propulsion device (20) as claimed in claim 15; 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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