Electric engine, electric propulsion device and aircraft

Abstract

The embodiments of the present application provide an electric engine, an electric propulsion device and an aircraft, and relate to the field of aircraft technology. The electric engine includes a power motor, a radiator, a fan and a wind protection structure. Among them, the radiator has an air duct. Along the axial direction of the fan, the fan has an air inlet side and an air outlet side, the power motor is located on the air outlet side of the fan, and the radiator is located on the air inlet side of the fan. The wind protection structure is arranged around the outer periphery of the fan, and the wind protection structure, the radiator and the fan form an air inlet channel, and the air inlet channel is connected to the air duct of the radiator. The fan is used to suck in the air on the side of the radiator facing away from the fan through the air duct and the air inlet channel and blow it out from the air outlet side. In this way, the internal temperature of the power motor can be controlled within the allowable range to ensure 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 in a transmission manner and is used to drive the propeller to rotate. During the operation of the power motor, a radiator and a fan are usually used to dissipate the heat of the power motor so that the temperature of the power motor is within a reasonable range. In related technologies, in order to improve the heat dissipation performance of the radiator, the distance between the power motor and the fan is increased or the volume of the radiator and the fan is increased.

[0003] However, the electric engine is small in size, and the space for arranging the radiator and the fan is often small. It is impossible to arrange the large-volume radiator and fan in the related technology, and it is impossible to increase the distance between the power motor and the fan. Therefore, how to ensure heat dissipation without increasing the size of the electric engine has become a problem that needs to be solved urgently. Summary of the invention

[0004] The present application aims to provide an electric engine, an electric propulsion device and an aircraft, which achieve good heat dissipation effect on the power motor and realize a small-volume design of the 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, the radiator having air channels;

[0008] The fan has an air inlet side and an air outlet side along the axial direction of the fan, the power motor is located on the air outlet side of the fan, and the radiator is located on the air inlet side of the fan;

[0009] The wind protection structure is arranged around the outer periphery of the fan, and the wind protection structure, the radiator and the fan form an air inlet channel, the air inlet channel is communicated with the air hole of the radiator, and the fan is used to suck the air on the side of the radiator facing away from the fan through the air hole and the air inlet channel and blow it out from the air outlet side.

[0010] The heat generated during the operation of the power motor will be transferred to the radiator to prevent the heat from continuously accumulating inside the power motor, control the temperature inside the power motor within the allowable range, and ensure the working performance of the power motor. The fan blows air to the radiator, and the radiator exchanges heat with the air, transferring the heat to the air, so that the air takes away the heat from the radiator, cools the radiator, and ensures that the heat generated by the power motor is continuously transferred to the radiator.

[0011] The fan blows the air from the side of the radiator facing away from the fan through the air duct and the air inlet channel to between the fan and the power motor, forming an airflow path that enters from the bottom and exits from the top. The side of the radiator facing away from the fan is not blocked, which increases the air intake speed of the air entering the air duct, thereby improving the heat dissipation efficiency of the radiator. In addition, the middle area of ​​the radiator is not blocked, and air can also enter the middle area of ​​the radiator, further improving the heat dissipation efficiency of the radiator. In addition, the airflow path that enters from the bottom and exits from the top can reduce the axial spacing between the fan and the power motor, so that the axial length of the electric motor is smaller, and then the volume of the electric motor can be reduced, which is beneficial to the layout of the electric motor.

[0012] In some possible implementations, along the axial direction of the fan, the heat sink is located below the fan, and the power motor is located above the fan;

[0013] A first air outlet channel is formed between the fan and the power motor.

[0014] In some possible implementations, along the axial direction of the fan, part of the outer peripheral side of the fan is located in the space enclosed by the wind protection structure, and part of the outer peripheral side of the fan is located outside the wind protection structure, so that part of the outer peripheral side of the fan forms a second air outlet channel.

[0015] In some possible implementations, the fan includes a fan blade, and along the axial direction of the fan, part of the outer peripheral side of the fan blade is located in the space surrounded by the wind protection structure, and part of the outer peripheral side of the fan blade is located outside the wind protection structure;

[0016] The height of the fan blade in the wind protection structure is greater than or equal to a first height and less than or equal to a second height. The first height is one-third of the maximum height of the fan blade along the axial direction of the fan, and the second height is two-thirds of the maximum height of the fan blade along the axial direction of the fan.

[0017] In some possible implementations, the power motor has a liquid cooling channel;

[0018] The outlet end of the liquid cooling channel is communicated with the inlet end of the radiator, and the outlet end of the radiator is communicated with the inlet end of the liquid cooling channel. The liquid cooling channel and the radiator are used to form a cooling medium loop.

[0019] In some possible implementations, the electric engine further includes a liquid supply pipe and a liquid return pipe;

[0020] 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, liquid return pipe, radiator and liquid supply pipe are used to form a cooling medium loop.

[0021] In some possible implementations, the liquid return pipe is a rigid pipe, and both ends of the liquid return pipe are fixedly connected to the radiator and the housing of the power motor respectively; and / or,

[0022] The liquid supply pipe is a rigid pipe, and both ends of the liquid supply pipe are fixedly connected to the radiator and the housing of the power motor respectively.

[0023] In some possible implementations, the return pipe and the supply pipe are both rigid pipes, and there are two return pipes and two supply pipes, which are equally spaced and alternately arranged along the circumference of the radiator.

[0024] In some possible implementations, the electric engine also includes: a liquid pump, which is fixed to the housing of the power motor, the outlet end of the liquid pump is connected to the inlet end of the liquid cooling channel, the inlet end of the liquid pump is connected to the outlet end of the radiator, and the liquid pump is used to make the cooling medium flow in the cooling medium circuit.

[0025] In some possible implementations, the electric engine further includes a drive motor, the drive motor serves as a pump motor of the liquid pump, and the drive motor is drivingly connected to the fan, and the drive motor is also used to drive the fan to rotate; or,

[0026] The electric engine also includes a driving motor and a liquid pump motor. The driving motor is drivingly connected to the fan to drive the fan to rotate, and the liquid pump motor serves as a pump motor of the liquid pump.

[0027] 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 as described in any one of the first aspects, the propeller being arranged on a side of a power motor away from a radiator and being transmission-connected to the power motor, the power motor being used to drive the propeller to rotate;

[0028] The radiator, fan and wind shield are all located on the side of the power motor away from the propeller.

[0029] A third aspect of the present application provides an aircraft, the aircraft comprising a nacelle and an electric propulsion device as shown in the second aspect or an electric engine as shown in any one of the first aspects, the electric propulsion device or the electric engine being arranged on the nacelle;

[0030] The nacelle is arranged at intervals with the power motor of the electric engine, the nacelle comprises a first cavity and a second cavity separated from each other, the first cavity is located between the power motor and the second cavity, the first cavity has a first opening and a second opening, and the first opening and the second opening both communicate with the inside and the outside of the first cavity;

[0031] The air channel of the radiator of the electric engine is connected to the first cavity through the first opening, and the fan of the electric engine is used to suck the air entering the first cavity from the second opening through the air channel and blow it out from the air outlet side of the fan.

[0032] In some possible implementations, the power motor is located outside the nacelle and is arranged side by side with the nacelle along the axial direction of the fan.

[0033] In some possible implementations, the wind shielding structure and the heat sink of the electric engine are located inside the first cavity through the first opening; a portion of the fan blades are located inside the first cavity, and another portion of the fan blades are located outside the first cavity;

[0034] Along the axial direction of the fan, the minimum distance between the nacelle and the power motor is greater than the maximum distance between the fan blades and the power motor.

[0035] In some possible implementations, the nacelle also includes a third cavity, the first cavity is located between the second cavity and the third cavity, the first opening connects the first cavity and the third cavity, the third cavity has a third opening, the third opening connects the inside and the outside of the third cavity, and at least part of the power motor is located inside the third cavity through the third opening.

[0036] In some possible implementations, the nacelle includes a partition member, which divides the interior of the nacelle into a first cavity and a second cavity, and a distance between a side of the partition member close to the radiator and the radiator gradually decreases in a direction from the outside of the nacelle to the inside;

[0037] At least one second opening is adjacent to the partition member.

[0038] In some possible implementations, the first cavity includes multiple opening groups, and the multiple opening groups are arranged at intervals along the axial direction of the fan. The opening group closest to the second cavity among the multiple opening groups is close to the partition piece, and each opening group includes multiple second openings arranged at intervals along the circumference of the fan. 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 the three-dimensional structure of an aircraft provided in an embodiment of the present application;

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

[0042] Figure 3 A schematic top view of a radiator provided in an embodiment of the present application;

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

[0044] Figure 5 for Figure 4 A schematic diagram of the architecture of the electric engine shown;

[0045] Figure 6 for Figure 4 A schematic diagram of a three-dimensional structure in which a fan and a wind protection structure cooperate;

[0046] Figure 7 for Figure 4 A front view schematic diagram of the cooperation between the fan and the wind protection structure;

[0047] Figure 8 for Figure 4 A schematic diagram of the three-dimensional structure of the fan;

[0048] Fig. 9 for Figure 8 A schematic front view of the fan shown;

[0049] Fig.10 for Figure 4 The schematic diagram of the structure of the electric engine and the nacelle shown;

[0050] Fig.11 for Fig.10 Schematic diagram of the internal structure of the nacelle;

[0051] Fig.12 A schematic diagram of the structure of another nacelle provided in an embodiment of the present application;

[0052] Fig.13 for Fig.10 A schematic diagram of the electric engine and the nacelle shown;

[0053] Fig.14 A schematic diagram of the structure of another nacelle and electric engine provided in an embodiment of the present application.

[0054] Description of reference numerals:

[0055] 11. Fuselage; 12. Wings; 13. Tail; 14. Arms;

[0056] 15. Nacelle; 151. First cavity; 152. Second cavity; 153. Partition piece; 154. First opening; 155. Second opening; 156. Connecting opening; 157. Third cavity; 158. Third opening; 159. Fourth opening; 160. Annular partition piece;

[0057] 20. Electric propulsion device; 20a. Fixed electric propulsion device; 20b. Tilting electric propulsion device; 21. Electric engine; 22. Propeller;

[0058] 100, power motor; 110, stator; 111, stator bracket; 112, stator winding; 120, rotor; 121, rotor housing; 122, magnetic steel;

[0059] 200, radiator; 210, air duct;

[0060] 300, fan; 310, fan blade; 320, wheel hub;

[0061] 400, wind protection structure; 410, wind protection ring;

[0062] 500, driving motor;

[0063] 600, liquid supply pipe; 700, liquid return pipe; 800, motor controller. DETAILED DESCRIPTION

[0064] At present, when an aircraft is in operation, the power motor generates a large amount of heat. In related technologies, a radiator is used to dissipate the heat from the motor. For example, the heat generated by the power motor flows into the radiator, and then the heat of the radiator is taken away by the flow of external air, thereby forming a cooling effect. However, when the radiator uses external air flow to dissipate heat, the heat dissipation efficiency is low.

[0065] For this reason, a fan is often set to blow air to the radiator to achieve the purpose of dissipating heat from the radiator. Among them, when the fan and the radiator are arranged, the fan is arranged above the radiator, and the fan blows air downward to dissipate heat from the radiator. In the related field, in order to improve the heat dissipation performance of the radiator, the volume of the radiator and the fan is increased or the distance between the power motor and the fan is increased. However, the increase in the volume of the radiator and the fan and the increase in the distance between the power motor and the fan often lead to an increase in the volume of the equipment, but the electric engine of the aircraft is small in size, and the space for arranging the radiator and the fan is often small. It is impossible to arrange the large-volume radiator and fan in the related field, and it is impossible to increase the distance between the power motor and the fan.

[0066] It is understandable that 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 much research and development on the size of the radiator and the size of the fan, and usually the front end of the radiator will not be very tight and too much shielding. 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 of the radiator will be blocked by the motor and pump. 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.

[0067] Therefore, in an electric vertical take-off and landing aircraft, due to space and weight requirements, the volume of the radiator and the fan cannot be increased, and the distance between the power motor and the fan cannot be increased, resulting in poor heat dissipation performance of the radiator.

[0068] In response to the above technical problems, the embodiments of the present application provide an electric engine, an electric propulsion device, and an aircraft. Without increasing the volume of the radiator and the fan or increasing the distance between the power motor and the fan to improve the heat dissipation effect, the fan is arranged above the radiator. The fan can suck the air below the radiator into the inside of the radiator and discharge it from the top of the radiator, forming an airflow path from bottom to top. Since the bottom of the radiator is not blocked, air can enter each area of ​​the radiator, and the air intake meets the requirements to improve the heat dissipation performance of the radiator. In addition, the airflow path from bottom to top can reduce the axial spacing between the fan and the power motor, so that the axial length of the electric engine is smaller, and then the volume of the electric engine can be reduced, which is beneficial to the layout of the electric engine.

[0069] 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.

[0070] An embodiment of the present application provides an aircraft, which may be an electric vertical take-off and landing (eVTOL) aircraft or other types of aircraft.

[0071] Figure 1 A schematic diagram of the three-dimensional structure 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.

[0072] 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 fuselage structure of an existing aircraft. The wings 12 are fixedly connected to the fuselage 11, and the structure of the wings 12 can also refer to the fixed wing structure of an existing aircraft, which will not be repeated here. The tail 13 is arranged at the tail of the fuselage 11, and the tail 13 is integrally formed or mechanically connected with the fuselage 11, and is a symmetrical structure. The structure of the tail 13 can also refer to the tail structure of an existing aircraft, which will not be repeated here.

[0073] 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 .

[0074] 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 .

[0075] The electric propulsion device 20 is arranged on the fuselage 11 and / or the wing 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 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.

[0076] Continue to see Figure 1 As shown, the aircraft further includes an arm 14 and a nacelle 15, both of which are fixedly connected to the electric propulsion device 20, so that the electric propulsion device 20 is arranged 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.

[0077] In some embodiments, Figure 1As 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).

[0078] 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).

[0079] In some examples, the electric propulsion device 20 provided on the aircraft may include a fixed electric propulsion device 20 a (eg, a fixed rotor), and the fixed electric propulsion device 20 a is fixedly connected to any one of the fuselage 11 , the wing 12 , and the tail 13 .

[0080] In some examples, the electric propulsion device 20 provided on the aircraft may include a tilting electric propulsion device 20b (e.g., a tilting rotor), and a tilting mechanism is provided 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.

[0081] In some examples, all electric propulsion devices 20 provided on the aircraft are fixed electric propulsion devices 20a.

[0082] In other examples, all the electric propulsion devices 20 provided on the aircraft are tilting electric propulsion devices 20b.

[0083] 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.

[0084] In the embodiment of the present application, the electric propulsion device 20 is composed of a power battery (not shown in the figure), an electric engine 21, a propeller 22, etc. and their accessories. Among them, the electric engine 21 is a system composed of a power motor 100, a motor controller 800, cables, etc. and their accessories, which can convert electrical energy into mechanical energy. In actual implementation, the electric engine 21 can also be called an electric propulsion system.

[0085] Among them, Figure 1 As shown, the electric engine 21 is arranged on the machine arm 14 or the nacelle 15, 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.

[0086] Figure 2 A schematic diagram of the architecture of an electric propulsion device provided in an embodiment of the present application.

[0087] like Figure 2 As shown, the electric engine 21 includes a power motor 100 and a motor controller 800. The power motor 100 is transmission-connected to the propeller 22. The motor controller 800 is located inside the power motor 100. The motor controller 800 is electrically connected to the power motor 100. The motor controller 800 is used to control the power motor 100 to drive the propeller 22 to rotate.

[0088] like Figure 2 As shown, the power motor 100 includes a rotor 120 and a stator 110. The rotor 120 includes a rotor housing 121 and a magnet 122 connected to the inside of the rotor housing 121. The rotor housing 121 is used to be fixedly connected to the hub of the propeller 22. The stator 110 includes a stator winding 112 and a stator bracket 111. The stator winding 112 is connected to the outside of the stator bracket 111 and is located inside the rotor housing 121.

[0089] like Figure 2 As shown, the motor controller 800 is located inside the stator bracket 111. In addition, the motor controller 800 includes a power module, a bus capacitor, a drive board, a main control board, etc. It should be noted that the motor controller 800 can be used to control the drive motor 500 and / or the variable pitch motor and / or the liquid pump motor, etc. in addition to controlling the power motor 100 that drives the propeller 22 to rotate.

[0090] Figure 3 A schematic top view of a radiator provided in an embodiment of the present application.

[0091] During operation, the power motor 100 continuously accumulates heat inside, which will cause the temperature inside the power motor 100 to rise. In order to control the temperature inside the power motor 100 within the allowable range, Figure 2 As shown, the electric motor 21 further includes a radiator 200, which is located on a side of the power motor 100 away from the propeller 22, and the radiator 200 has an air duct 210 (such as Figure 3 As shown in the figure), the air channel 210 is used for allowing air to pass through, thereby increasing the heat exchange area between the radiator 200 and the air and improving the heat dissipation capacity of the radiator 200.

[0092] The specific structure of the heat sink 200 is not limited here. Exemplarily, the heat sink 200 includes an annular body and a plurality of heat dissipation fins, the plurality of heat dissipation fins are arranged at intervals along the radial direction of the annular body and are located inside the annular body, the two ends of each heat dissipation fin are respectively fixedly connected to the annular body, and the gap between two adjacent heat dissipation fins forms an air channel 210.

[0093] In order to take away the heat generated by the power motor 100, the power motor 100 has a liquid cooling channel (not shown in the figure), the inlet end of the liquid cooling channel is connected to the outlet end of the radiator 200, and the outlet end of the liquid cooling channel is connected to the inlet end of the radiator 200. The radiator 200 and the liquid cooling channel are used to form a cooling medium circuit for the flow of cooling medium.

[0094] The cooling medium may be a single coolant (eg, a water / ethylene glycol mixture, oil, etc.) or a mixture of multiple coolants.

[0095] After the cooling medium in the liquid cooling channel absorbs the heat generated by the power motor 100, it changes from a low-temperature cooling medium to a high-temperature cooling medium. After the high-temperature cooling medium enters the radiator 200, the high-temperature cooling medium exchanges heat with the air through the radiator 200 and changes to a low-temperature cooling medium again. The low-temperature cooling medium then enters the interior of the liquid cooling channel. In this cycle, the heat inside the power motor 100 can be taken away in time, so that the temperature inside the power motor 100 is within the allowable range, thereby ensuring the output power of the power motor 100.

[0096] It can be seen that the heat generated by the power motor 100 is transferred to the radiator 200 through the cooling medium, preventing the heat from continuously accumulating inside the power motor 100, controlling the temperature inside the power motor 100 within an allowable range, and ensuring the working performance of the power motor 100.

[0097] In order to make the cooling medium flow in the cooling medium circuit, the electric engine 21 also includes a liquid pump (not shown in the figure), the outlet end of the liquid pump is connected to the inlet end of the liquid cooling channel, and the inlet end of the liquid pump is connected to the outlet end of the radiator 200. The liquid pump is used to make the cooling medium flow in the cooling medium circuit.

[0098] Figure 4 A schematic front view of an electric engine provided in an embodiment of the present application, Figure 5 for Figure 4 Schematic diagram of the architecture of the electric motor shown.

[0099] In order to improve the heat dissipation efficiency of the radiator 200, the electric motor 21 further includes a fan 300 and a wind shielding structure 400. The radiator 200, the fan 300 and the wind shielding structure 400 are all located on the side of the power motor 100 away from the propeller 22. Figure 4 The fan 300 has an air inlet side and an air outlet side. The power motor 100 is located at the air outlet side of the fan 300, and the radiator 200 is located at the air inlet side of the fan 300. The wind shielding structure 400 is arranged around the outer periphery of the fan 300, and the wind shielding structure 400, the radiator 200 and the fan 300 form an air inlet channel. The air inlet channel is connected to the air channel 210 of the radiator 200. The fan 300 is used to transfer the air on the side of the radiator 200 facing away from the fan 300 (such as Figure 5 The air is sucked in through the air duct 210 and the air inlet passage (as indicated by the solid arrow in the middle) and blown out from the air outlet side of the fan 300.

[0100] The fan 300 first draws air from the side of the radiator 200 away from the fan 300 into the air channel 210, and the air in the air channel 210 exchanges heat with the radiator 200 to become high-temperature air. The high-temperature air then enters the air inlet channel and leaves the air inlet channel from the air outlet side of the fan 300 to take away the heat on the radiator 200, cool the radiator 200, and ensure that the heat generated by the power motor 100 is continuously transferred to the radiator 200.

[0101] In view of the fact that the fan 300 blows the air on the side of the radiator 200 facing away from the fan 300 through the air duct 210 and the air inlet channel to the air outlet side of the fan 300, forming an airflow path that enters from the bottom and exits from the top, the axial distance between the fan 300 and the power motor 100 can be reduced, so that the axial length of the electric engine 21 is smaller, and the volume of the electric engine 21 can be reduced, which is beneficial to the layout of the electric engine 21. In addition, the airflow path that enters from the bottom and exits from the top, and the fact that the side of the radiator 200 facing away from the fan 300 is not blocked, ensure that the middle area of ​​the radiator 200 can also enter the air, thereby increasing the air intake speed entering the air duct 210, thereby improving the heat dissipation efficiency of the radiator 200.

[0102] In order to exhaust the air in the air inlet duct, Figure 5 As shown, along the axial direction of the fan 300 (such as Figure 5 In the Z direction, the heat sink 200 is located below the fan 300, and the power motor 100 is located above the fan 300. A first air outlet channel (as shown in A1 in the figure) is formed between the fan 300 and the power motor 100. The airflow in the air inlet channel is thrown out from the fan 300 along the axial direction of the fan 300 toward the upper end surface of the power motor 100, and is discharged from the first air outlet channel (as shown in A2 in the figure). Figure 5 as shown).

[0103] Figure 6 for Figure 4 A schematic diagram of the three-dimensional structure of the fan and the wind protection structure. Figure 7 for Figure 4 A front view schematic diagram of the cooperation between the fan and the wind protection structure.

[0104] In order to further improve the exhaust efficiency of the airflow in the air inlet channel, in some possible implementations, Figure 6 and Figure 7 It can be seen that along the axial direction of the fan 300, part of the outer peripheral side of the fan 300 is located in the space surrounded by the wind protection structure 400, and part of the outer peripheral side of the fan 300 is located outside the wind protection structure 400, so that part of the outer peripheral side of the fan 300 forms a second air outlet channel (such as Figure 5 As shown in A2 in FIG. 1 , part of the air in the air inlet channel is thrown out from the side of the fan 300 and discharged from the second air outlet channel (as shown in FIG. Figure 5 as shown).

[0105] It should be noted that during the flight of the aircraft, the amount of air discharged from the first air outlet channel and the second air outlet channel is much smaller than the amount of air generated by the rotation of the propeller 22. In other words, the amount of air discharged from the first air outlet channel and the second air outlet channel is much smaller than the amount of air passing through the propeller 22. Therefore, the airflow discharged from the first air outlet channel and the second air outlet channel will not affect the flight of the aircraft.

[0106] For example, Figure 6 and Figure 7 As shown, the wind protection structure 400 includes a wind protection ring 410, which is arranged around the outer periphery of the fan 300 and is fixedly connected to the heat sink 200. Figure 5 As shown, along the radial direction of the fan 300 (such as Figure 5 In the Y direction), the wind protection ring 410 is spaced apart from the fan 300.

[0107] In order to prevent airflow from leaking from the installation gap between the wind shield and the radiator 200, the wind shield structure 400 also includes a seal (not shown in the figure), which is arranged between the wind shield ring 410 and the radiator 200 to seal the gap between the wind shield ring 410 and the radiator 200.

[0108] The sealing member is an annular structure and is disposed around the fan 300. In addition, the sealing member is made of a flexible material, such as sponge. When the sealing member is made of sponge, the weight of the electric motor 21 can be reduced.

[0109] Figure 8 for Figure 4 Schematic diagram of the three-dimensional structure of the fan, Fig. 9 for Figure 8 A schematic front view of the fan is shown.

[0110] like Figure 8 and Fig. 9As shown, the fan 300 includes a hub 320 and a plurality of blades 310. The plurality of blades 310 are arranged around the hub 320. The plurality of blades 310 are arranged at intervals along the circumference of the fan 300. One end of each blade 310 is fixedly connected to the hub 320, and the other end of each blade 310 is a free end.

[0111] There is no limitation on the blade shape of the fan blade 310. Figure 8 and Fig. 9 It can be seen that along the radial direction of the fan 300, the direction of the fan blade 310 is designed to be a straight line from the inside to the outside, and the deflection angle of the fan blade 310 is designed to be a torsion.

[0112] In some embodiments, Figure 8 As shown, the fan blade 310 and the wheel hub 320 are an integral structure formed in one piece, which can improve the manufacturing efficiency of the fan 300. In other embodiments, the fan blade 310 and the wheel hub 320 can also be fixedly connected by means of threaded connection or the like.

[0113] In order to make the air on the side of the heat sink 200 away from the fan 300 be sucked into the air duct 210 and the air inlet channel and discharged from the air outlet side, Figure 6 and Figure 7 It can be seen that along the axial direction of the fan 300 (such as Figure 7 In the Z direction, part of the outer peripheral side of the fan blade 310 is located in the space surrounded by the wind shielding structure 400, and part of the outer peripheral side of the fan blade 310 is located outside the wind shielding structure 400. That is, along the axial direction of the fan 300, part of the fan blade 310 extends into the space surrounded by the wind shielding structure 400, or in other words, part of the fan blade 310 is wrapped by the wind shielding structure 400.

[0114] Of course, along the axial direction of the fan 300, in addition to setting a portion of the outer peripheral side of the fan blade 310 in the space enclosed by the wind protection structure 400 and the other portion outside the wind protection structure 400, in some scenarios, along the axial direction of the fan 300, the outer peripheral side of the fan blade 310 may also be located in the space enclosed by the wind protection structure 400, that is, the fan blade 310 extends into the space enclosed by the wind protection structure 400.

[0115] There is no restriction on the height of the fan blade 310 in the wind protection structure 400. For example, the height of the fan blade 310 in the wind protection structure 400 is greater than or equal to the first height and less than or equal to the second height, the first height is one-third of the maximum height of the fan blade 310 along the axial direction of the fan 300, and the second height is two-thirds of the maximum height of the fan blade 310 along the axial direction of the fan 300. Setting the height of the fan blade 310 in the wind protection structure 400 between the first height and the second height can increase the airflow discharged from the second air outlet channel and make the airflow speed within the allowable range, thereby further improving the discharge efficiency of the airflow.

[0116] In order to make the cooling medium flow into the interior of the liquid cooling channel, in some possible implementations, such as Figure 4 As shown, the electric engine 21 further includes a liquid supply pipe 600 and a liquid return pipe 700. The outlet end of the liquid cooling channel is connected to the inlet end of the radiator 200 through the liquid return pipe 700, and the outlet end of the radiator 200 is connected to the inlet end of the liquid cooling channel through the liquid supply pipe 600. The liquid cooling channel, the liquid return pipe 700, the radiator 200 and the liquid supply pipe 600 are used to form a cooling medium loop.

[0117] The liquid return pipe 700 may be directly or indirectly connected to the outlet end of the liquid cooling channel, and the liquid supply pipe 600 may be directly or indirectly connected to the inlet end of the liquid cooling channel.

[0118] In order to simplify the structure of the electric motor 21, in some possible implementations, the liquid return pipe 700 is a rigid pipe, and the two ends of the liquid return pipe 700 are respectively fixedly connected to the housing of the radiator 200 and the power motor 100. For example, the housing of the power motor 100 includes a motor back cover fixedly connected to the stator bracket 111, and the liquid return pipe 700 is fixedly connected to the motor back cover. The liquid supply pipe 600 is a rigid pipe, and the two ends of the liquid supply pipe 600 are respectively fixedly connected to the housing of the radiator 200 and the power motor 100. For example, the liquid supply pipe 600 is fixedly connected to the motor back cover.

[0119] It can be seen that the material of the return pipe 700 and the supply pipe 600 is a rigid material, and the return pipe 700 and the supply pipe 600 also play a supporting role in function, so that the radiator 200 is fixed to the power motor 100, so there is no need to set a fixed structure connecting the radiator 200 and the power motor 100, thereby increasing the use of the return pipe 700 and the supply pipe 600 and reducing the number of parts of the electric engine 21, thereby achieving the purpose of simplifying the structure of the electric engine 21.

[0120] Exemplarily, the electric engine 21 may include a plurality of liquid supply pipes 600 and a plurality of liquid return pipes 700, and the radiator 200 is fixedly connected to the power motor 100 through the plurality of liquid supply pipes 600 and the plurality of liquid return pipes 700, so that the radiator 200 and the power motor 100 are fixedly fixed relatively firmly. At this time, the radiator 200 may include a plurality of outlet ends corresponding to the liquid supply pipes 600 one by one, and a plurality of inlet ends corresponding to the liquid return pipes 700 one by one, and each inlet end of the radiator 200 is connected to the outlet end of the liquid cooling channel through a corresponding liquid return pipe 700, and each outlet end of the radiator 200 is connected to the inlet end of the liquid pump through a corresponding liquid inlet pipe. For example, the electric engine 21 may include two liquid supply pipes 600 and two liquid return pipes 700, and the two liquid supply pipes 600 and the two liquid return pipes 700 are evenly spaced along the circumference of the radiator 200, so that the radiator 200 is fixed more firmly. The liquid supply pipes 600 and the liquid return pipes 700 can be alternately arranged along the circumference of the radiator 200, so that the cooling medium can flow into the radiator 200 from two opposite positions on the radiator 200 and flow out of the radiator 200 from two opposite positions on the radiator 200, which is beneficial to uniform heat dissipation of the radiator 200.

[0121] It should be noted that, in some embodiments, one of the liquid return pipe 700 and the liquid supply pipe 600 is a rigid pipe. In this case, one of the liquid return pipe 700 and the liquid supply pipe 600 serves as a supporting structure for fixing the radiator 200 to the power motor 100 .

[0122] In some possible implementations, such as Figure 4 As shown, the electric engine 21 also includes a drive motor 500, which is transmission-connected to the fan 300, and the drive motor 500 serves as a pump motor of the liquid pump, and the drive motor 500 is used to drive the fan 300 to rotate. In other words, the drive motor 500 includes an output shaft, one end of which is transmission-connected to the fan 300, and the other end of which is transmission-connected to the pump rotor of the liquid pump. It can be seen that the liquid pump and the fan 300 share a motor, and the drive motor 500 serves as a power source for the fan 300 and also as a power source for the liquid pump, so there is no need to set up a fan motor for driving the fan 300 separately, thereby simplifying the structure of the electric engine 21.

[0123] Of course, in addition to using the pump motor of the liquid pump, in some other possible implementations, the electric engine 21 includes a liquid pump motor (not shown in the figure) and a drive motor 500. The liquid pump motor is used as the pump motor of the liquid pump, and the drive motor 500 is connected to the fan 300 in a transmission manner, and the drive motor 500 is used to drive the fan 300 to rotate. In this case, the liquid pump and the fan 300 are driven by a motor respectively.

[0124] Fig.10 For Figure 4The schematic diagram of the structure of the electric engine and the nacelle shown in FIG. Fig.11 for Fig.10 Schematic diagram of the internal structure of the nacelle.

[0125] like Fig.10 As shown, when the electric engine 21 is installed in the nacelle 15, the power motor 100 is located outside the nacelle 15 and arranged side by side with the nacelle 15 along the axial direction of the fan 300. At this time, the rotor 120 of the power motor 100 is located in front of the leading edge of the nacelle 15 and is rotatably connected to the stator 110. The power motor 100 is located outside the nacelle 15 and arranged side by side with the nacelle 15 along the axial direction of the fan 300. At this time, the rotor 120 of the power motor 100 is located in front of the leading edge of the nacelle 15 and is rotatably connected to the stator 110. The radiator 200 is close to the nacelle 15.

[0126] In order to ensure that the side of the heat sink 200 away from the fan 300 has air, Fig.11 As shown, the nacelle 15 includes a first cavity 151 and a second cavity 152 separated from each other. The first cavity 151 is located between the power motor 100 and the second cavity 152. The first cavity 151 has a first opening 154 and a second opening 155. The first opening 154 and the second opening 155 both connect the inside and the outside of the first cavity 151. Fig.10 As shown, the air duct 210 of the radiator 200 of the electric engine 21 is connected to the first cavity 151 through the first opening 154, and the fan 300 of the electric engine 21 is used to suck the air entering the first cavity 151 from the second opening 155 through the air duct 210 and blow it to the air outlet side of the fan 300, that is, blow it between the nacelle 15 and the power motor 100.

[0127] It can be seen that the second opening 155 is functionally equivalent to the air inlet of the first cavity 151. The air outside the nacelle 15 enters the first cavity 151 through the second opening 155, so that the side of the radiator 200 away from the fan 300 has the air outside the nacelle 15. Under the action of the fan 300, the air in the first cavity 151 first enters the inside of the air channel 210, then enters the air inlet channel, and is discharged from the air outlet side of the fan 300. The temperature of the air outside the nacelle 15 is relatively low, and the air outside the nacelle 15 is used to dissipate the air, further improving the heat dissipation efficiency of the radiator 200. In addition, the air outside the nacelle 15 is used to dissipate the heat of the radiator 200 in a bottom-in-top-out manner, which prevents the hot air that absorbs the heat of the radiator 200 from blowing on the components arranged in the second cavity 152, and avoids secondary thermal damage to the components in the second cavity 152.

[0128] The devices in the second cavity 152 include batteries, sensors, controllers, etc. In addition, in order to dissipate heat for the devices in the second cavity 152, such as Fig.11 As shown, the second cavity 152 also includes a connecting opening 156, which connects the inside and outside of the second cavity 152. The air outside the nacelle 15 enters the second cavity 152 through the connecting opening 156 to cool the device and keep the device in the second cavity 152 unobstructed.

[0129] In some embodiments, along the axial direction of the fan 300, the communication opening 156 is located on a side of the second cavity 152 away from the power motor 100, or in other words, the communication opening 156 is located at an end of the nacelle 15 away from the power motor 100. Of course, the communication opening 156 can also be set at other positions on the nacelle 15.

[0130] Fig.12 A schematic diagram of the structure of another nacelle provided in an embodiment of the present application.

[0131] In order to drain the water in the first cavity 151, in some embodiments, as Fig.11 As shown, the nacelle 15 includes a partition 153, and the partition 153 divides the interior of the nacelle 15 into a first cavity 151 and a second cavity 152, that is, the partition 153 separates the first cavity 151 and the second cavity 152. Fig.11 and Fig.12 It can be seen that the distance between the side of the partition 153 close to the radiator 200 and the radiator 200 gradually decreases from the outside of the nacelle 15 to the inside, so that the surface of the partition 153 along the axial direction of the fan 300 facing the power motor 100 is a tapered surface. At least one second opening 155 is close to the partition 153. In this way, the water in the first cavity 151 flows from the inside to the outside along the tapered surface, and flows out of the first cavity 151 from the second opening 155 close to the partition 153.

[0132] In order to increase the outflow speed of water from the second opening 155 near the partition 153, as shown in the figure, the distance between the inner wall of the second opening 155 near the partition 153 and the edge of the partition 153 in the axial direction of the fan 300 is a preset distance, for example, the preset distance is zero. In other words, the second opening 155 near the partition 153 is also used as a water outlet of the first cavity 151 in terms of function.

[0133] In order to improve the air intake efficiency of the first cavity 151, in some possible implementations, the first cavity 151 includes a plurality of opening groups, such as Fig.11As shown, the number of opening groups is five, and of course, the number of opening groups may be less than or more than five. Each opening group includes a plurality of second openings 155 arranged at intervals along the circumferential direction of the fan 300. The plurality of opening groups are arranged at intervals along the axial direction of the fan 300, and the opening group closest to the second cavity 152 among the plurality of opening groups is close to the partition 153, and the second openings 155 of the opening group closest to the second cavity 152 are also used to discharge water in the first cavity 151.

[0134] In order to reduce the axial distance between the nacelle 15 and the power motor 100, in some possible implementations, such as Fig.11 As shown, the wind shielding structure 400 and the radiator 200 of the electric engine 21 are located inside the first cavity 151 through the first opening 154 .

[0135] Of course, in addition to the wind shielding structure 400 and the radiator 200 being located in the first cavity 151 through the first opening 154, in some embodiments, a portion of the wind shielding structure 400 is located outside the first cavity 151, and another portion of the wind shielding structure 400 and the radiator 200 are located inside the first cavity 151 through the first opening 154. In other embodiments, the wind shielding structure 400 is located outside the first cavity 151, and the radiator 200 is located inside the first cavity 151 through the first opening 154. In still other embodiments, a portion of the wind shielding structure 400 and the radiator 200 are located outside the first cavity 151, and a portion of the radiator 200 is located inside the first cavity 151 through the first opening 154.

[0136] Fig.13 for Fig.10 A schematic diagram of the electric engine and nacelle shown.

[0137] In order to increase the airflow discharge speed, in some possible implementations, such as Fig.13 As shown, a portion of the fan blade 310 of the fan 300 is located inside the first cavity 151, and another portion of the fan blade 310 is located outside the first cavity 151. Along the axial direction of the fan 300, the minimum distance between the nacelle 15 and the power motor 100 is greater than the maximum distance between the fan blade 310 and the power motor 100. In this way, a first air outlet channel is formed between the fan 300 and the power motor 100, and a portion of the outer peripheral side of the fan 300 forms a second air outlet channel.

[0138] like Fig.13As shown, when the fan 300 rotates, under the rotation of the fan 300, the air outside the nacelle 15 enters the interior of the first cavity 151 through the second opening 155, then enters the interior of the air duct 210 of the radiator 200, then enters the interior of the air inlet channel, and finally is discharged from the air outlet side of the fan 300. The exhaust airflow includes a first airflow and a second airflow, the first airflow is discharged from the second air outlet channel, and the second airflow is discharged from the first air outlet channel. The two-way discharge of the first airflow and the second airflow improves the smoothness of the airflow during the entire flow process, improves the flow rate, and increases the heat dissipation efficiency of the radiator 200.

[0139] Of course, in addition to locating a portion of the fan blade 310 inside the first cavity 151 and another portion outside the first cavity 151 , in some scenarios, the fan blade 310 may also be disposed inside the first cavity 151 .

[0140] In the above content, the power motor 100 is located inside the nacelle 15 . However, in some scenarios, at least a portion of the power motor 100 may also be located inside the nacelle 15 .

[0141] Fig.14 A schematic diagram of the structure of another nacelle and electric engine provided in an embodiment of the present application.

[0142] Fig.14 and Fig.13 The difference is that part of the power motor 100 is located inside the nacelle 15. Specifically, Fig.14 As shown, the nacelle 15 further includes a third cavity 157, the first cavity 151 is located between the second cavity 152 and the third cavity 157, the first opening 154 connects the first cavity 151 and the third cavity 157, and the third cavity 157 has a third opening 158, and the third opening 158 connects the inside and the outside of the third cavity 157. At least part of the power motor 100 is located inside the third cavity 157 through the third opening 158, for example Fig.14 As shown, a portion of the power motor 100 is located inside the third cavity 157 through the third opening 158 . Part of the rotor 120 of the power motor 100 is located inside the third cavity 157 through the third opening 158 .

[0143] The fan 300 is used to suck the air in the first cavity 151 through the air duct 210 and the air inlet channel and discharge it from the air outlet side of the fan 300 to the inside of the third cavity 157. The air in the air inlet channel can be discharged from the first air outlet channel and / or the second air outlet channel to the inside of the third cavity 157, for example Fig.14 As shown, the air in the air inlet channel is discharged from the first air outlet channel and the second air outlet channel to the inside of the third cavity 157.

[0144] In order to discharge the air in the third cavity 157 to the outside, in some embodiments, as Fig.14 As shown, the rotor 120 and the inner wall of the third cavity 157 form an exhaust passage (such as Fig.14 As shown in FIG. 1 , the exhaust passage connects the inside and outside of the third cavity 157 , and the exhaust passage is used to discharge the air in the third cavity 157 to the outside of the third cavity 157 .

[0145] In other embodiments, Fig.14 As shown, the third cavity 157 further has a fourth opening 159 , which is located between the third opening 158 and the first cavity 151 , and is used to discharge the air in the third cavity 157 to the outside of the third cavity 157 .

[0146] In order to further improve the efficiency of exhausting the air in the third cavity 157, the number of fourth openings 159 is multiple, and the multiple fourth openings 159 can be arranged at intervals along the circumference of the fan 300, or the multiple fourth openings 159 can be divided into multiple exhaust groups, and the multiple exhaust groups are arranged at intervals along the axial direction of the fan 300, and each exhaust group has multiple fourth openings 159 arranged at intervals along the circumference of the fan 300.

[0147] In summary, the air in the third cavity 157 can be discharged to the outside of the third cavity 157 through the fourth opening 159 and / or the exhaust passage.

[0148] There is no limitation on how the third cavity 157 is formed. Fig.14 As shown, the nacelle 15 may include an annular partition 160 . The annular partition 160 is located inside the nacelle 15 . The annular partition 160 has a first opening 154 . The annular partition 160 separates the first cavity 151 from the third cavity 157 .

[0149] It should be noted that when the electric propulsion device 20 is installed on the arm 14, the arm 14 includes a first cavity 151 having a first opening 154 and a second opening 155. The relationship between the electric propulsion device 20 and the first cavity 151 refers to the above content and will not be repeated here.

[0150] In addition, in order to drain the water in the first cavity 151, the first cavity 151 includes a conical inner wall, and the distance between the side of the conical inner wall close to the radiator 200 and the radiator 200 gradually decreases along the direction from the outside of the arm 14 to the inside, and the function of the conical inner wall is the same as that of the partition 153 in the above content.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] 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.

[0155] 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 engine (21), characterized in that: include: Power Motor (100); A heat sink (200), wherein the heat sink (200) has an air channel (210); A fan (300), wherein along the axial direction of the fan (300), the fan (300) has an air inlet side and an air outlet side, the power motor (100) is located on the air outlet side of the fan (300), and the heat sink (200) is located on the air inlet side of the fan (300); a wind protection structure (400), the wind protection structure (400) being arranged around the outer periphery of the fan (300), and the wind protection structure (400), the radiator (200) and the fan (300) forming an air inlet channel, the air inlet channel being in communication with the air hole (210) of the radiator (200), and the fan (300) being used to suck air from a side of the radiator (200) facing away from the fan (300) through the air hole (210) and the air inlet channel and blow the air out from the air outlet side; A first air outlet channel is formed between the fan (300) and the power motor (100).

2. The electric motor (21) according to claim 1, characterized in that Along the axial direction of the fan (300), the heat sink (200) is located below the fan (300), and the power motor (100) is located above the fan (300).

3. The electric motor (21) according to claim 2, characterized in that Along the axial direction of the fan (300), part of the outer peripheral side of the fan (300) is located in the space surrounded by the wind protection structure (400), and part of the outer peripheral side of the fan (300) is located outside the wind protection structure (400), so that part of the outer peripheral side of the fan (300) forms a second air outlet channel.

4. The electric motor (21) according to claim 3, characterized in that The fan (300) comprises a fan blade (310), and along the axial direction of the fan (300), part of the outer peripheral side of the fan blade (310) is located in the space surrounded by the wind protection structure (400), and part of the outer peripheral side of the fan blade (310) is located outside the wind protection structure (400); The height of the fan blade (310) located in the wind protection structure (400) is greater than or equal to a first height and less than or equal to a second height, the first height being one third of the maximum height of the fan blade (310) along the axial direction of the fan (300), and the second height being two thirds of the maximum height of the fan blade (310) along the axial direction of the fan (300).

5. The electric engine (21) according to any one of claims 1 to 4, characterized in that: The power motor (100) has a liquid cooling channel; The outlet end of the liquid cooling channel is in communication with the inlet end of the radiator (200), and the outlet end of the radiator (200) is in communication with the inlet end of the liquid cooling channel; the liquid cooling channel and the radiator (200) are used to form a cooling medium circuit.

6. The electric motor (21) according to claim 5, characterized in that The electric engine (21) further comprises a liquid supply pipe (600) and a liquid return pipe (700); The outlet end of the liquid cooling channel is connected to the inlet end of the radiator (200) via the liquid return pipe (700), and the outlet end of the radiator (200) is connected to the inlet end of the liquid cooling channel via the liquid supply pipe (600). The liquid cooling channel, the liquid return pipe (700), the radiator (200) and the liquid supply pipe (600) are used to form the cooling medium circuit.

7. The electric motor (21) according to claim 6, characterized in that The liquid return pipe (700) is a rigid pipe, and both ends of the liquid return pipe (700) are respectively fixedly connected to the housing of the radiator (200) and the power motor (100); and / or, The liquid supply pipe (600) is a rigid pipe, and both ends of the liquid supply pipe (600) are fixedly connected to the radiator (200) and the housing of the power motor (100), respectively.

8. The electric motor (21) according to claim 7, characterized in that The liquid return pipe (700) and the liquid supply pipe (600) are both rigid pipes, and the number of the liquid return pipe (700) and the number of the liquid supply pipe (600) are both two, the two liquid return pipes (700) and the two liquid supply pipes (600) are both equally spaced along the circumference of the radiator (200), and the liquid return pipe (700) and the liquid supply pipe (600) are alternately arranged along the circumference of the radiator (200).

9. The electric motor (21) according to claim 5, characterized in that The electric engine (21) further comprises: a liquid pump, the liquid pump being fixed on the housing of the power motor (100), the outlet end of the liquid pump being connected to the inlet end of the liquid cooling channel, the inlet end of the liquid pump being connected to the outlet end of the radiator (200), and the liquid pump being used to allow the cooling medium to flow in the cooling medium circuit.

10. The electric motor (21) according to claim 9, characterized in that The electric engine (21) further comprises a drive motor (500), the drive motor (500) serving as a pump motor of the liquid pump, the drive motor (500) being transmission-connected to the fan (300), and the drive motor (500) being further used to drive the fan (300) to rotate; or, The electric engine (21) further comprises a drive motor (500) and a liquid pump motor; the drive motor (500) is drivingly connected to the fan (300) for driving the fan (300) to rotate; and the liquid pump motor serves as a pump motor of the liquid pump.

11. An electric propulsion device (20), characterized in that: Comprising a propeller (22) and an electric engine (21) according to any one of claims 1 to 10, wherein the propeller (22) is arranged on a side of the power motor (100) away from the radiator (200) and is transmission-connected to the power motor (100), and the power motor (100) is used to drive the propeller (22) to rotate; The radiator (200), the fan (300) and the wind shielding structure (400) are all located on a side of the power motor (100) away from the propeller (22).

12. An aircraft, characterized in that: Comprising a nacelle (15) and an electric propulsion device (20) according to claim 11 or an electric engine (21) according to any one of claims 1 to 10, wherein the electric propulsion device (20) or the electric engine (21) is arranged on the nacelle (15); The nacelle (15) comprises a first cavity (151) and a second cavity (152) which are separated from each other, the first cavity (151) being located between the power motor (100) and the second cavity (152), the first cavity (151) having a first opening (154) and a second opening (155), the first opening (154) and the second opening (155) both being connected to the inside and the outside of the first cavity (151); The air duct (210) of the radiator (200) of the electric engine (21) is connected to the first cavity (151) through the first opening (154), and the fan (300) of the electric engine (21) is used to suck in air entering the first cavity (151) from the second opening (155) through the air duct (210) and blow it out from the air outlet side of the fan (300).

13. The aircraft according to claim 12, characterized in that The power motor (100) is located outside the nacelle (15) and is arranged side by side with the nacelle (15) along the axial direction of the fan (300).

14. The aircraft according to claim 13, characterized in that The wind shielding structure (400) of the electric engine (21) and the radiator (200) are located inside the first cavity (151) through the first opening (154); a portion of the fan blade (310) of the fan (300) is located inside the first cavity (151), and another portion of the fan blade (310) is located outside the first cavity (151); Along the axial direction of the fan (300), the minimum distance between the top of the nacelle (15) and the bottom of the power motor (100) is greater than the maximum distance between the top of the fan blade (310) and the bottom of the power motor (100).

15. The aircraft according to claim 12, characterized in that The nacelle (15) further includes a third cavity (157), wherein the first cavity (151) is located between the second cavity (152) and the third cavity (157), the first opening (154) connects the first cavity (151) and the third cavity (157), the third cavity (157) has a third opening (158), and the third opening (158) connects the inside and the outside of the third cavity (157), and at least a portion of the power motor (100) is located inside the third cavity (157) through the third opening (158).

16. The aircraft according to claim 12, characterized in that: The nacelle (15) comprises a partition (153), wherein the partition (153) divides the interior of the nacelle (15) into the first cavity (151) and the second cavity (152), and the distance between a side of the partition (153) close to the radiator (200) and the radiator (200) gradually decreases in a direction from the outside of the nacelle (15) to the inside; At least one of the second openings (155) is located close to the partition member (153).

17. The aircraft according to claim 16, characterized in that The first cavity (151) comprises a plurality of opening groups, the plurality of opening groups are arranged at intervals along the axial direction of the fan (300), the opening group closest to the second cavity (152) among the plurality of opening groups is close to the partition (153), and each of the opening groups comprises a plurality of second openings (155) arranged at intervals along the circumferential direction of the fan (300).

Images