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 fan and a radiator. The power motor has a liquid cooling channel, and the liquid cooling channel and the radiator are used to form a cooling medium circulation loop. 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 inlet side of the fan, and the radiator is located on the air outlet side of the fan. Among them, the fan has an air guide assembly, and the air guide assembly is used to guide part of the airflow on the air inlet side of the fan to the middle area of ​​the fan, and blow from the middle area of ​​the fan to the radiator. In this way, the heat dissipation efficiency of the power motor is relatively 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] In a first aspect, an embodiment of the present application provides an electric engine, which includes a power motor, a fan and a radiator. The power motor has a liquid cooling channel, the outlet end of the liquid cooling channel is connected to the inlet end of the radiator, the outlet end of the radiator is connected to the inlet end of the liquid cooling channel, and the liquid cooling channel and the radiator are used to form a cooling medium circulation loop.

[0006] 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 inlet side of the fan, and the radiator is located on the air outlet side of the fan.

[0007] The fan has an air guide assembly, which is used to guide part of the airflow on the air inlet side of the fan to the middle area of ​​the fan and blow it from the middle area of ​​the fan to the radiator.

[0008] The electric engine provided in the embodiment of the present application can increase the wind speed and air supply in the middle area of ​​the fan through the air guide of the air guide component, and increase the air pressure between the middle area of ​​the fan and the radiator. The air outlet of the fan is relatively uniform in various places, and it is not easy for the air on the side of the radiator away from the fan to pass through the middle area of ​​the radiator and flow back to the side of the radiator close to the fan, thereby causing the problem of heating the radiator. This is beneficial to improving the heat dissipation effect of the fan on the radiator, and is convenient for achieving a good heat dissipation effect on the power motor in a smaller electric engine, so that the power motor is not prone to problems such as overheating.

[0009] In a possible implementation, the fan includes a plurality of blades arranged along a circumferential direction, one end of the air guide assembly is disposed around the outer periphery of the plurality of blades, and the other end of the air guide assembly extends along the blades toward the center of the fan.

[0010] In a possible implementation, the wind guide assembly includes a wind shielding ring and a wind guide structure. The wind shielding ring is arranged around the outer circumference of the plurality of fan blades, and the wind guide structure is arranged on the fan blades, and the wind guide structure is used to guide part of the airflow at one end of the fan blade close to the wind shielding ring to one end of the fan blade close to the center of the fan, and blow it toward the heat sink from the end of the fan blade close to the center of the fan.

[0011] In a possible implementation, the fan blade includes a pressure surface and a suction surface that are arranged opposite to each other, and the wind guiding structure is arranged on the pressure surface.

[0012] In a possible implementation, the air guide structure includes an air duct structure portion, and the air duct structure portion has an air guide air duct therein. Two ends of the air guide air duct extend toward the center of the fan and toward the wind protection ring respectively.

[0013] In one possible implementation, the air duct structure portion has an air inlet and an air outlet, which respectively connect the air guide duct to the outside of the air duct structure portion. The air inlet is located at one end of the air duct structure portion close to the wind protection ring and at a side of the air duct structure portion close to the power motor, and the air outlet is located at one end of the air duct structure portion close to the center of the fan and at a side of the air duct structure portion close to the radiator.

[0014] In a possible implementation, the air duct structure includes a guide wall, and the guide wall is used to guide the airflow flowing toward the center of the fan to the air outlet.

[0015] In a possible implementation, the guide wall and the air outlet are arranged opposite to each other in the axial direction of the fan, and the distance between the guide wall and the air outlet gradually increases from one end of the guide wall close to the center of the fan to the other end of the guide wall away from the center of the fan.

[0016] In a possible implementation, the air duct structure is located at an edge of the fan blade close to the heat sink.

[0017] In a possible implementation, one end of the air duct structure portion close to the center of the fan extends to one end of the fan blade close to the center of the fan.

[0018] In a possible implementation, one end of the air duct structure portion that is away from the center of the fan extends to the wind shielding ring and is fixedly connected to the wind shielding ring.

[0019] In a possible implementation, the fan blades are fixedly connected to the wind shielding ring.

[0020] In a possible implementation, the heat sink is tilted relative to the axial direction of the fan.

[0021] In a possible implementation, the electric engine further includes a liquid supply pipe and a liquid return pipe. The outlet end of the liquid cooling channel is connected to the inlet end of the radiator through the liquid return pipe, and the outlet end of the radiator is connected to the inlet end of the liquid cooling channel through the 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. 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.

[0022] In a possible implementation, the electric engine further includes a liquid pump, 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.

[0023] In a possible implementation, the electric engine includes a drive motor, and the liquid pump includes a pump rotor. A first output end of the drive motor is drivingly connected to the pump rotor, and the drive motor is used to drive the pump rotor to rotate to drive the cooling medium to flow. A second output end of the drive motor is drivingly connected to a fan, and the drive motor is also used to drive the fan.

[0024] In a possible implementation, the driving motor is a pump motor of a liquid pump, and the liquid pump is fixed on a housing of the power motor.

[0025] 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 the air flow channel is used to allow the air flow on the air outlet side of the fan to pass through the radiator and flow to the side of the radiator away from the fan when the fan blows air. Both ends of each heat dissipation flat tube are connected to the liquid cooling channel to form a cooling medium circulation loop.

[0026] In a possible implementation, the radiator further includes a first liquid collecting pipe and a second liquid collecting pipe connected to each other, wherein the first liquid collecting pipe is connected to one end of the plurality of heat dissipation flat tubes, and the second liquid collecting pipe is connected to the other end of the plurality of heat dissipation flat tubes. The first liquid collecting pipe and the second liquid collecting pipe are connected to the liquid cooling channel.

[0027] In a possible implementation, a first partition plate is provided in the first collecting pipe, and the first partition plate divides the first collecting pipe into a first section and a second section. And / or a second partition plate is provided in the second collecting pipe, and the second partition plate divides the second collecting pipe into a third section and a fourth section.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] In a possible implementation, the heat sink is a heat sink with a spiral disc structure.

[0033] The second aspect of the embodiment of the present application provides an electric propulsion device, which includes a propeller and an electric engine in any of the above embodiments. The propeller is connected to a power motor of the electric engine, and the power motor is used to drive the propeller to rotate.

[0034] A third aspect of the present application provides an aircraft, which includes a fuselage, wings, a tail, and an electric propulsion device in any of the above embodiments. The electric propulsion device is arranged on the wings, and / or the fuselage, and / or the tail. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0038] Figure 3 A schematic diagram of a fan provided in an embodiment of the present application;

[0039] Figure 4 A schematic diagram of airflow at a fan and a radiator of an electric engine provided in an embodiment of the present application;

[0040] Figure 5 A simplified structural diagram of a fan provided in an embodiment of the present application;

[0041] Figure 6 A schematic diagram of another fan provided in an embodiment of the present application;

[0042] Figure 7 A schematic diagram of airflow at a fan and a radiator of another electric engine provided in an embodiment of the present application;

[0043] Figure 8 A schematic diagram of another electric engine provided in an embodiment of the present application;

[0044] Fig. 9 A schematic diagram of another electric engine provided in an embodiment of the present application;

[0045] Fig.10 A schematic diagram of a radiator provided in an embodiment of the present application;

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

[0047] Description of reference numerals:

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

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

[0050] 100. power motor; 110. liquid cooling channel;

[0051] 200, fan; 210, wheel hub; 220, fan blade; 221, pressure surface; 222, suction surface; 230, wind shield; 240, wind guide structure; 241, wind duct structure; 2411, guide wall; 242, wind guide duct; 243, air inlet; 244, air outlet; 245, wind guide rib; 250, transmission shaft; 260, fan cover;

[0052] 300, radiator; 310, first manifold; 311, first partition plate; 312, third partition plate; 313, fifth partition plate; 314, first subsection; 315, second subsection; 316, fifth subsection; 317, sixth subsection; 320, heat dissipation flat tube; 330, second manifold; 331, second partition plate; 332, fourth partition plate; 333, sixth partition plate; 334, third subsection; 335, fourth subsection; 336, seventh subsection; 337, eighth subsection; 341, first liquid inlet; 342, first liquid outlet; 343, second liquid inlet; 344, second liquid outlet;

[0053] 400, liquid pump;

[0054] 500, liquid supply pipe;

[0055] 600, liquid return pipe;

[0056] 700. Driving motor. DETAILED DESCRIPTION

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] like Figure 1As shown, the aircraft includes a fuselage 11, wings 12 and a tail 13. Among them, the fuselage 11 is a symmetrical structure, and the remaining 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.

[0065] 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 .

[0066] 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 .

[0067] 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.

[0068] 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.

[0069] 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).

[0070] In some embodiments, Figure 1As 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).

[0071] 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 .

[0072] 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.

[0073] In some examples, all electric propulsion devices 20 provided on the aircraft are fixed electric propulsion devices 20a.

[0074] In other examples, all the electric propulsion devices 20 provided on the aircraft are tilting electric propulsion devices 20b.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] Figure 2 A schematic diagram of an electric motor provided in an embodiment of the present application.

[0079] like Figure 2As 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.

[0080] 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.

[0081] The electric engine 21 also includes a radiator 300, which is arranged on the side of the power motor 100 away from the propeller 22. The radiator 300 can be arranged on the housing of the power motor 100. The heat on the power motor 100 can be transferred to the radiator 300. The radiator 300 is used to dissipate heat for the power motor 100.

[0082] The electric engine 21 further includes a fan 200, which is disposed on a side of the power motor 100 away from the propeller 22. Along the axial direction of the fan 200, the fan 200 has an air inlet side and an air outlet side, the power motor 100 is located on the air inlet side of the fan 200, and the radiator 300 is located on the air outlet side of the fan 200. In other words, the radiator 300 and the power motor 100 are respectively disposed on both sides of the axial direction of the fan 200, the fan 200 is located between the radiator 300 and the power motor 100, and the fan 200 is used to blow air toward the radiator 300 to cool the radiator 300.

[0083] The axial direction of the fan 200 refers to the extending direction of the rotation axis of the fan 200 .

[0084] The electric engine 21 also includes a drive motor 700, which is disposed on a side of the power motor 100 away from the propeller 22. The drive motor 700 is connected to the housing of the power motor 100 (for example, it can be fixedly connected). The drive motor 700 is located on the air inlet side of the fan 200. The drive motor 700 is transmission-connected to the fan 200. The drive motor 700 is used to drive the fan 200 so that the fan blows air toward the radiator 300.

[0085] The fan 200 includes an impeller including a plurality of blades 220 arranged along the circumference of the fan 200 . The driving motor 700 is used to drive the blades 220 to rotate so as to generate an airflow flowing toward the radiator 300 .

[0086] Exemplarily, the impeller also includes a hub 210, and one end of the fan blade 220 facing the center of the fan 200 is fixedly connected to the hub 210. The drive motor 700 is transmission-connected to the hub 210, and the drive motor 700 is used to drive the hub 210 to rotate, so that the hub 210 drives the fan blade 220 to rotate.

[0087] In some examples, the fan 200 further includes a transmission shaft 250, and the drive motor 700 is connected to the hub 210 through the transmission shaft 250, so that the drive motor 700 and the impeller are arranged at an axial interval of the fan 200, thereby facilitating the fan 200 to absorb air through the gap between the impeller and the drive motor 700. In addition, it is also convenient to assemble the drive motor 700 on the housing of the power motor 100, and the drive motor 700 is easier to assemble.

[0088] Exemplarily, the hub 210 and the blades 220 rotate around the transmission shaft 250 , and the extension direction of the transmission shaft 250 is the axial direction of the fan 200 .

[0089] Illustratively, the transmission shaft 250 is coaxial with the output shaft of the driving motor 700 .

[0090] In other examples, the hub 210 may be directly connected to the output shaft of the drive motor 700 .

[0091] 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 heat dissipation 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 layout 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.

[0092] Specifically, due to the obstruction of the drive motor, the air intake of the middle area of ​​the fan (that is, the middle area of ​​the impeller) is small, resulting in a small air supply in the middle area of ​​the fan. In addition, due to the centrifugal force of the rotation of the impeller, the wind speed in the outer area of ​​the fan (that is, the outer area of ​​the impeller) is higher than the wind speed in the middle area of ​​the fan, and the wind blown out by the fan is blocked by the radiator, and the airflow between the fan and the radiator will be pressed toward the outer area of ​​the fan. In this way, the space between the fan and the radiator will have a phenomenon in which the air pressure in the middle area of ​​the fan is low and the air pressure in the outer area of ​​the fan is high. At this time, the wind blown out by the fan will pass through the part of the radiator close to the outside. On the side of the radiator facing away from the fan, 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, 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.

[0093] 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.

[0094] Based on this, in an embodiment of the present application, the fan 200 has an air guide assembly, which is used to guide part of the airflow on the air inlet side of the fan 200 to the middle area of ​​the fan 200 and blow it from the middle area of ​​the fan 200 to the radiator 300.

[0095] In this way, the wind speed and air supply volume in the middle area of ​​the fan 200 can be increased through the wind guiding of the wind guiding component, and the air pressure between the middle area of ​​the fan 200 and the radiator 300 is increased. The air outlet of the fan 200 is relatively uniform, and it is not easy for the air on the side of the radiator 300 away from the fan 200 to pass through the middle area of ​​the radiator 300 and flow back to the side of the radiator 300 close to the fan 200, thereby causing the radiator 300 to be heated. This is beneficial to improving the heat dissipation effect of the fan 200 on the radiator 300, and is convenient for achieving a good heat dissipation effect on the power motor 100 in a smaller electric engine 21, so that the power motor 100 is not prone to problems such as overheating.

[0096] Part of the air located on the side of the radiator 300 close to the fan 200 can pass through the radiator 300 through the middle area of ​​the radiator 300, so that the wind blown by the fan 200 can dissipate the heat in the middle area of ​​the radiator 300, and it is not easy for the air located on the side of the radiator 300 away from the fan 200 to pass through the middle area of ​​the radiator 300 and flow back to the side of the radiator 300 close to the fan 200.

[0097] The air guide assembly can be used to guide part of the airflow on the air inlet side of the fan 200 to the area near the hub 210 , and blow it from the area near the hub 210 to the heat sink 300 .

[0098] In some possible embodiments, one end of the air guide assembly is disposed around the outer periphery of multiple fan blades 220, and the other end of the air guide assembly extends along the fan blades 220 toward the center of the fan 200, so as to block at least part of the airflow from flowing toward the outer periphery of the fan blades 220 and to guide part of the airflow located on the outer periphery of the fan blades 220 to the middle area of ​​the fan 200.

[0099] Figure 3 A schematic diagram of a fan provided in an embodiment of the present application, Figure 4 A schematic diagram of airflow at a fan and a radiator of an electric engine provided in an embodiment of the present application. Figure 4 The arrow direction in the figure indicates the air flow direction of the air flowing through the fan and the heat sink.

[0100] like Figure 3 , Figure 4 As shown, in some possible implementations, the wind guide assembly includes a wind shielding ring 230 and a wind guide structure 240, and the wind shielding ring 230 is arranged around the outer peripheral side of the plurality of fan blades 220. The wind guide structure 240 is arranged on the fan blade 220. The wind guide structure 240 is used to guide part of the air at one end of the fan blade 220 close to the wind shielding ring 230 to one end of the fan blade 220 close to the center of the fan 200, and blow it toward the radiator 300 from the end of the fan blade 220 close to the center of the fan 200.

[0101] In this way, part of the air flowing toward the outside of the fan blade 220 will be blocked by the wind protection ring 230 and will be blocked by the wind guide structure 240. The wind guide structure 240 will guide this part of the air to the end of the fan blade 220 close to the center of the fan 200, and then blow it toward the radiator 300, so as to achieve the blocking of part of the airflow flowing toward the outer peripheral side of the fan blade 220 and guide part of the airflow located on the outer peripheral side of the fan blade 220 to the middle area of ​​the fan 200. The structure of the air guide component is relatively simple, and it is more convenient to set it on the fan 200.

[0102] Exemplarily, the wind shield 230 may be a circular ring structure.

[0103] In the example where the fan 200 includes the hub 210 , the wind guide structure 240 is used to guide part of the air at one end of the fan blade 220 close to the wind shield 230 to one end of the fan blade 220 close to the hub 210 , and blow it toward the radiator 300 from the end of the fan blade 220 close to the hub 210 .

[0104] like Figure 3 As shown, in some possible implementations, the fan blade 220 can be fixedly connected to the wind shielding ring 230. Specifically, one end of the fan blade 220 away from the hub 210 can be fixedly connected to the wind shielding ring 230.

[0105] In this way, the wind shield 230 is convenient to assemble. In addition, the wind shield 230 has a better blocking effect on the air flowing outside the fan blade 220, which is conducive to blocking more air to the wind guide structure 240, thereby facilitating the improvement of the wind speed and air supply volume in the middle area of ​​the fan 200.

[0106] In some other possible implementations, the wind shield 230 may be fixedly connected to the radiator 300 or the housing of the power motor 100 via a connecting mechanism.

[0107] like Figure 3 As shown, in some possible implementations, the fan blade 220 includes a pressure surface 221 and a suction surface 222 that are arranged opposite to each other, and the wind guiding structure 240 is arranged on the pressure surface 221 .

[0108] In this way, the air guiding structure 240 can exert force on the air, and the air guiding structure 240 has a better air guiding effect, which is conducive to guiding more air from the end of the fan blade 220 close to the wind protection ring 230 to the end of the fan blade 220 close to the center of the fan 200.

[0109] The pressure surface 221 is a blade surface for pushing air when the fan blade 220 rotates, and the suction surface 222 is a blade surface for sucking air when the fan blade 220 rotates. The pressure surface 221 and the suction surface 222 are located on both sides of the fan blade 220 in the thickness direction.

[0110] In some other possible implementations, the suction surface 222 of the fan blade 220 may also be provided with a wind guiding structure 240 .

[0111] Figure 5 A simplified structural diagram of a fan provided in an embodiment of the present application. Figure 5 The direction of the arrow in FIG. 1 is the airflow direction of the air flowing through the air guide duct.

[0112] like Figure 5 As shown, and see Figure 3In some possible embodiments, the air guide structure 240 includes an air duct structure portion 241, the air duct structure portion 241 has an air guide duct 242, the air duct structure portion 241 has an air inlet 243 and an air outlet 244, the air inlet 243 and the air outlet 244 respectively connect the air guide duct 242 to the outside of the air duct structure portion 241, and the air duct wall of the air guide duct 242 is a closed structure except for the air inlet 243 and the air outlet 244. The airflow flowing into the air guide structure 240 can enter the air guide duct 242 through the air inlet 243. The duct wall of the air guide duct 242 can limit the direction of the airflow in the air guide duct 242, so that this part of the airflow will not flow randomly. The airflow flowing from the air inlet 243 to the air outlet 244 is more efficient. After the airflow in the air guide duct 242 flows to the air outlet 244, it flows out from the air outlet 244 and blows toward the radiator 300. The air guide structure 240 has a better air guiding effect, which is conducive to guiding more air from the end of the fan blade 220 close to the wind protection ring 230 to the end of the fan blade 220 close to the hub 210.

[0113] Both ends of the air guide duct 242 extend toward the center of the fan 200 and toward the wind shield 230 respectively, so that the air flow in the air guide duct 242 has a higher flow efficiency from a position close to the wind shield 230 to a position close to the center of the fan 200, and the wind pressure and wind speed losses are small.

[0114] The air inlet 243 is located at one end of the air duct structure 241 close to the wind shield 230 and at one side of the air duct structure 241 close to the power motor 100, which is conducive to the airflow at the wind shield 230 to enter the air guide duct 242 more efficiently. The air outlet 244 is located at one end of the air duct structure 241 close to the center of the fan 200 and at one side of the air duct structure 241 close to the radiator 300, which is conducive to the airflow in the air guide duct 242 to blow from the middle area of ​​the fan 200 to the radiator 300 more efficiently.

[0115] In some possible implementations, the air duct structure 241 includes a guide wall 2411 , and the guide wall 2411 is used to guide the airflow flowing toward the center of the fan 200 to the air outlet 244 .

[0116] In this way, the turbulence in the air guide duct 242 can be reduced, so that the airflow in the air guide duct 242 can efficiently flow out from the air outlet 244, and the efficiency of guiding the air from the end of the fan blade 220 close to the wind protection ring 230 to the end of the fan blade 220 close to the center of the fan 200 is higher. The air guide structure 240 has a better guiding effect on the airflow, which is conducive to guiding more airflow from the end of the fan blade 220 close to the wind protection ring 230 to the end of the fan blade 220 close to the center of the fan 200.

[0117] In the axial direction of the fan 200, the guide wall 2411 is arranged opposite to the air outlet 244, and the distance between the guide wall 2411 and the air outlet 244 gradually increases from the end of the guide wall 2411 close to the center of the fan 200 to the end of the guide wall 2411 away from the center of the fan 200, so that the guide wall 2411 can guide the airflow flowing in the air guide duct 242 toward the center of the fan 200 to the air outlet 244.

[0118] In some possible implementations, the air duct structure portion 241 is located at an edge of the fan blade 220 close to the heat sink 300 .

[0119] In this way, more airflow blocked by the wind shield 230 can flow into the air guide duct 242 through the air inlet 243, and more airflow can be guided from the end of the fan blade 220 close to the wind shield 230 to the end of the fan blade 220 close to the center of the fan 200.

[0120] In some possible implementations, one end of the air duct structure portion 241 close to the center of the fan 200 extends to one end of the fan blade 220 close to the center of the fan 200 .

[0121] In this way, it is convenient to guide the airflow in the air guide duct 242 to a position close to the center of the fan 200 , so as to increase the wind speed and air supply volume in the middle area of ​​the fan 200 .

[0122] Exemplarily, one end of the air duct structure portion 241 close to the center of the fan 200 extends to the hub 210 and is fixedly connected to the hub 210 .

[0123] In some possible implementations, one end of the air duct structure portion 241 away from the center of the fan 200 extends to the wind shielding ring 230 and is fixedly connected to the wind shielding ring 230 .

[0124] In this way, the airflow at the wind shielding ring 230 can be efficiently flowed into the wind guide duct 242, which is beneficial to increase the air intake of the wind guide duct 242. In addition, the fan blade 220 and the wind shielding ring 230 can be fixedly connected through the wind duct structure 241.

[0125] Figure 6 A schematic diagram of another fan provided in an embodiment of the present application.

[0126] like Figure 6As shown, in some other possible embodiments, the air guide structure 240 includes an air guide rib 245, which is arranged on the pressure surface 221 of the fan blade 220. The air guide rib 245 can extend from the side edge of the fan blade 220 away from the radiator 300 to the side edge of the fan blade 220 close to the radiator 300. The distance between the end of the air guide rib 245 located at the side edge of the fan blade 220 away from the radiator 300 and the center of the fan 200 is greater than the distance between the end of the air guide rib 245 located at the side edge of the fan blade 220 close to the radiator 300 and the center of the fan 200, so that part of the airflow at the end of the fan blade 220 close to the wind protection ring 230 is guided to the end of the fan blade 220 close to the center of the fan 200 through the air guide rib 245, and blown to the radiator 300 from the end of the fan blade 220 close to the center of the fan 200. In addition, it is more convenient to arrange a solid air guide rib 245 on the fan blade 220.

[0127] Exemplarily, a plurality of wind guiding ribs 245 may be provided on each fan blade 220 .

[0128] like Figure 4 As shown, in some possible implementations, the heat sink 300 is disposed perpendicularly relative to the axial direction of the fan 200 .

[0129] Figure 7 A schematic diagram of airflow at a fan and a radiator of another electric engine provided in an embodiment of the present application.

[0130] like Figure 7 As shown, in some other possible implementations, the heat sink 300 is tilted relative to the axial direction of the fan 200 .

[0131] In this way, when there is insufficient space for arranging part of the fan 200 on the side away from the power motor 100, the distance between part of the radiator 300 and the fan 200 can be increased by arranging the radiator 300 at an axial tilt relative to the fan 200. The increased distance between part of the radiator 300 and the fan 200 is beneficial to diffusing high-speed airflow in the local area between the radiator 300 and the fan 200, thereby helping to increase the speed of the airflow blown onto the radiator 300, and also making the airflow blown to various locations on the radiator 300 more uniform, which is beneficial to improving the heat dissipation efficiency of the radiator 300.

[0132] Figure 8 A schematic diagram of another electric motor provided in an embodiment of the present application.

[0133] like Figure 8As shown, in some 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.

[0134] In this way, the power motor 100 is convenient to transfer heat 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.

[0135] In some examples, the electric engine 21 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.

[0136] In this way, it is easy to achieve communication between the radiator 300 spaced apart from the power motor 100 and the liquid cooling channel 110 of the power motor 100 .

[0137] In some examples, the electric engine 21 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.

[0138] In this way, it is easy to drive the cooling medium to flow in the cooling medium circulation loop.

[0139] 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 .

[0140] 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.

[0141] Fig. 9 A schematic diagram of another electric motor provided in an embodiment of the present application.

[0142] like Fig. 9 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.

[0143] In this way, the radiator 300 and the housing of the power motor 100 do not need to be fixed 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 improve the heat dissipation efficiency of the radiator 300.

[0144] 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.

[0145] Exemplarily, the electric engine 21 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 electric engine 21 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.

[0146] In some possible implementations, the electric engine 21 includes a drive motor 700, and the liquid pump 400 includes a pump rotor. A first output end of the drive motor 700 is in transmission connection with the pump rotor, and the drive motor 700 is used to drive the pump rotor to rotate to drive the cooling medium to flow, and a second output end of the drive motor 700 is in transmission connection with the fan 200.

[0147] 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.

[0148] In some examples, the driving motor 700 is a pump motor of the liquid pump 400, that is, the liquid pump 400 includes the driving motor 700. 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.

[0149] In this way, the fan 200, the pump rotor and the drive motor 700 are connected more easily, and it is also convenient to set the drive motor 700 on the power motor 100, and the arrangement of the components of the electric motor 21 is easier.

[0150] In some other possible examples, the fan 200 and the pump rotor of the liquid pump 400 may be driven by different motors, respectively. For example, the drive motor 700 is not the pump motor of the liquid pump 400, the fan 200 is driven by the drive motor 700, and the pump rotor of the liquid pump 400 is driven by the pump motor.

[0151] In some possible embodiments, the fan 200 further includes a fan cover 260, which is disposed on the outside of the wind shield 230, and the fan cover 260 can be fixedly disposed on the housing of the radiator 300 or the power motor 100. Exemplarily, when the wind shield 230 is fixedly connected to the housing of the radiator 300 or the power motor 100 through a connecting mechanism, the wind shield 230 can be fixedly connected to the fan cover 260, and the fan cover 260 is fixedly connected to the housing of the radiator 300 or the power motor 100 through a connecting mechanism. When the wind shield 230 is fixedly connected to the fan blades 220, the fan cover 260 can be fixedly connected to the housing of the radiator 300 or the power motor 100 through a connecting mechanism, and the wind shield 230 can rotate relative to the fan cover 260, for example, the fan cover 260 can be fixedly connected to the radiator 300 through a fastener.

[0152] In other examples, the heat from the power motor 100 may be transferred to the heat sink 300 in other ways. For example, the heat from the power motor 100 may be transferred to the heat sink 300 through a heat conducting member.

[0153] Fig.10 A schematic diagram of a heat sink provided by an embodiment of the present application. In the figure, the x direction is a first direction, the y direction is a second direction, and the first direction is perpendicular to the second direction.

[0154] like Fig.10As shown, in some possible implementations, the radiator 300 may include 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, and the air flow channel is used to allow the air flow on the air outlet side of the fan 200 to pass through the radiator 300 and flow to the side of the radiator 300 away from the fan 200 when the fan 200 blows air. 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.

[0155] 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.

[0156] 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 .

[0157] 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 .

[0158] Exemplarily, the heat dissipation flat tube 320 is a straight tube extending along the first direction.

[0159] 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.

[0160] The inner arc surface of the first header 310 is opposite to the inner arc surface of the second header 330 .

[0161] 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 .

[0162] 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 .

[0163] In some examples, 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 blown 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.

[0164] Fig.11 A schematic diagram of another radiator provided in an embodiment of the present application.

[0165] like Fig.11 As shown, in some examples, 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 and a second section, so that the flow of the cooling medium in the first section is not affected by the second section, and the flow of the cooling medium in the second section is not affected by the first section, 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.

[0166] 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 and a fourth section, so that the flow of the cooling medium in the third section is not affected by the fourth section, and the flow of the cooling medium in the fourth section is not affected by the third section, 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.

[0167] In some examples where the first partition plate 311 is provided in the first liquid collecting pipe 310 and the second partition plate 331 is provided in the second liquid collecting pipe 330, one of the first section and the third section is provided with a first liquid inlet 341, and the other of the first section and the third section is provided with a first liquid outlet 342. A heat dissipation flat tube 320 is provided between the first section and the third section, and the first section and the third section are connected through the heat dissipation flat tube 320 provided therebetween.

[0168] The first section, the third section, and the heat dissipation flat tube 320 connecting the first section and the third section form a heat dissipation channel, the first liquid inlet 341 is the inlet end of the heat dissipation channel formed by the first section, the third section, and the heat dissipation flat tube 320 connecting the first section and the third section, and the first liquid outlet 342 is the outlet end of the heat dissipation channel formed by the first section, the third section, and the heat dissipation flat tube 320 connecting the first section and the third section. 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, and the cooling medium flowing into the radiator 300 through the first liquid inlet 341 flows through the first section, the third section, and the heat dissipation flat tube 320 connecting the first section and the third section, and after heat is dissipated in the heat dissipation flat tube 320 connecting the first section and the third section, it flows out of the radiator 300 through the first liquid outlet 342.

[0169] One of the second section and the fourth section is provided with a second liquid inlet 343, and the other of the second section and the fourth section is provided with a second liquid outlet 344. A heat dissipation flat tube 320 is provided between the second section and the fourth section, and the second section and the fourth section are connected through the heat dissipation flat tube 320 provided therebetween.

[0170] The second section, the fourth section, and the heat dissipation flat tube 320 connecting the second section and the fourth section form a heat dissipation channel, the second liquid inlet 343 is the inlet end of the heat dissipation channel formed by the second section, the fourth section, and the heat dissipation flat tube 320 connecting the second section and the fourth section, and the second liquid outlet 344 is the outlet end of the heat dissipation channel formed by the second section, the fourth section, and the heat dissipation flat tube 320 connecting the second section and the fourth section. 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, and the cooling medium flowing into the radiator 300 through the second liquid inlet 343 flows through the second section, the fourth section, and the heat dissipation flat tube 320 connecting the second section and the fourth section, and after heat is dissipated in the heat dissipation flat tube 320 connecting the second section and the fourth section, it flows out of the radiator 300 through the second liquid outlet 344.

[0171] 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.

[0172] 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.

[0173] Exemplarily, the first partition plate 311 and the second partition plate 331 are opposite to each other in the first direction, the first section and the third section are opposite to each other in the first direction, and the second section and the fourth section are opposite to each other in the first direction. The cooling medium flowing in the heat dissipation channel formed by the first section, the third section, and the heat dissipation flat tubes 320 connecting the first section and the third section is more uniform than the cooling medium flowing in the heat dissipation channel formed by the second section, the fourth section, and the heat dissipation flat tubes 320 connecting the second section and the fourth section.

[0174] In some examples, a third partition plate 312 is provided in the first section, the third partition plate 312 divides the first section into a first sub-section 314 and a second sub-section 315, the first liquid inlet 341 is located in the first sub-section 314, a fourth partition plate 332 is provided in the third section, the fourth partition plate 332 divides the third section into a third sub-section 334 and a fourth sub-section 335, and the first liquid outlet 342 is located in the fourth sub-section 335.

[0175] A heat dissipation flat tube 320 is provided between the first sub-segment 314 and the third sub-segment 334, and the first sub-segment 314 and the third sub-segment 334 are connected via the heat dissipation flat tube 320 provided therebetween; a heat dissipation flat tube 320 is provided between the third sub-segment 334 and the second sub-segment 315, and the third sub-segment 334 and the second sub-segment 315 are connected via the heat dissipation flat tube 320 provided therebetween; a heat dissipation flat tube 320 is provided between the second sub-segment 315 and the fourth sub-segment 335, and the second sub-segment 315 and the fourth sub-segment 335 are connected via the heat dissipation flat tube 320 provided therebetween.

[0176] After the cooling medium flows into the first sub-segment 314 from the first liquid inlet 341, it flows to the third sub-segment 334 through the heat dissipation flat tubes 320 between the first sub-segment 314 and the third sub-segment 334, then flows to the second sub-segment 315 through the heat dissipation flat tubes 320 between the third sub-segment 334 and the second sub-segment 315, then flows to the fourth sub-segment 335 through the heat dissipation flat tubes 320 between the second sub-segment 315 and the fourth sub-segment 335, and finally flows out of the radiator 300 from the first liquid outlet 342.

[0177] In this way, the heat dissipation path of the heat dissipation channel formed by the first section, the third section and the heat dissipation flat tube 320 connecting the first section and the third section can be made longer on the basis of the relatively compact structure of the radiator 300, so as to achieve a better heat dissipation effect on the cooling medium.

[0178] The second subsection 315 is located between the first partition plate 311 and the first subsection 314, the first liquid inlet 341 is located at one end of the first subsection 314 away from the second partition plate 331, the fourth subsection 335 is located between the second partition plate 331 and the third subsection 334, and the first liquid outlet 342 is located at one end of the fourth subsection 335 close to the fourth partition plate 332. In the second direction, the third partition plate 312 is located between the fourth partition plate 332 and the first liquid inlet 341.

[0179] In some examples, a fifth partition plate 313 is provided in the second section, the fifth partition plate 313 divides the second section into a fifth sub-segment 316 and a sixth sub-segment 317, the second liquid outlet 344 is located in the sixth sub-segment 317, a sixth partition plate 333 is provided in the fourth section, the sixth partition plate 333 divides the fourth section into a seventh sub-segment 336 and an eighth sub-segment 337, and the second liquid inlet 343 is located in the seventh sub-segment 336.

[0180] A heat dissipation flat tube 320 is provided between the seventh sub-segment 336 and the fifth sub-segment 316, and the seventh sub-segment 336 is connected to the fifth sub-segment 316 via the heat dissipation flat tube 320 provided therebetween; a heat dissipation flat tube 320 is provided between the fifth sub-segment 316 and the eighth sub-segment 337, and the fifth sub-segment 316 and the eighth sub-segment 337 are connected via the heat dissipation flat tube 320 provided therebetween; a heat dissipation flat tube 320 is provided between the eighth sub-segment 337 and the sixth sub-segment 317, and the eighth sub-segment 337 is connected to the sixth sub-segment 317 via the heat dissipation flat tube 320 provided therebetween.

[0181] After the cooling medium flows in from the second liquid inlet 343 and enters the seventh sub-segment 336, it flows to the fifth sub-segment 316 through the heat dissipation flat tubes 320 between the seventh sub-segment 336 and the fifth sub-segment 316, then flows to the eighth sub-segment 337 through the heat dissipation flat tubes 320 between the fifth sub-segment 316 and the eighth sub-segment 337, then flows to the sixth sub-segment 317 through the heat dissipation flat tubes 320 between the eighth sub-segment 337 and the sixth sub-segment 317, and finally flows out of the radiator 300 from the second liquid outlet 344.

[0182] In this way, the heat dissipation path of the heat dissipation channel formed by the second section, the fourth section and the heat dissipation flat tube 320 connecting the second section and the fourth section 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.

[0183] The sixth subsection 317 is located between the first partition plate 311 and the fifth subsection 316, and the second liquid outlet 344 is located at one end of the sixth subsection 317 close to the fifth partition plate 313. The eighth subsection 337 is located between the second partition plate 331 and the seventh subsection 336, and the second liquid inlet 343 is located at one end of the seventh subsection 336 away from the sixth partition plate 333. In the second direction, the sixth partition plate 333 is located between the fifth partition plate 313 and the second liquid inlet 343.

[0184] In some examples where 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 and the second section is provided with a first liquid inlet 341, and the other of the first section and the second section 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.

[0185] 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 and the fourth section is provided with a second liquid inlet 343, and the other of the third section and the fourth section 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.

[0186] In some other examples, the heat sink 300 may also be a heat sink with a spiral disk structure.

[0187] In this way, the heat dissipation path of the radiator 300 can be made longer on the basis of a relatively compact structure of the radiator 300, thereby achieving a better heat dissipation effect on the cooling medium.

[0188] 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: It comprises a power motor (100), a fan (200) and a radiator (300); 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), the outlet end of the radiator (300) is connected to the inlet end of the liquid cooling channel (110), and the liquid cooling channel (110) and the radiator (300) are used to form a cooling medium circulation loop; Along the axial direction of the fan (200), the fan (200) has an air inlet side and an air outlet side, the power motor (100) is located on the air inlet side of the fan (200), and the heat sink (300) is located on the air outlet side of the fan (200); The fan (200) has an air guide assembly, and the air guide assembly is used to guide part of the airflow on the air inlet side of the fan (200) to the middle area of ​​the fan (200), and blow it from the middle area of ​​the fan (200) to the heat sink (300); The fan (200) comprises a plurality of fan blades (220) arranged in a circumferential direction, and the wind guide assembly comprises a wind protection ring (230) and a wind guide structure (240); The fan blade (220) comprises a pressure surface (221) and a suction surface (222) that are arranged opposite to each other, and the wind guide structure (240) is arranged on the pressure surface (221); The wind guide structure (240) comprises a wind duct structure portion (241), and the wind duct structure portion (241) has a wind guide duct (242) therein; Two ends of the air guide duct (242) extend towards the center of the fan (200) and towards the wind protection ring (230), respectively; and / or, The air duct structure part (241) has an air inlet (243) and an air outlet (244), wherein the air inlet (243) and the air outlet (244) respectively connect the air guide duct (242) and the outside of the air duct structure part (241); the air inlet (243) is located at one end of the air duct structure part (241) close to the wind protection ring (230) and at a side of the air duct structure part (241) close to the power motor (100); and the air outlet (244) is located at one end of the air duct structure part (241) close to the center of the fan (200) and at a side of the air duct structure part (241) close to the radiator (300).

2. The electric motor (21) according to claim 1, characterized in that One end of the wind guide component is arranged around the outer periphery of the plurality of fan blades (220), and the other end of the wind guide component extends along the fan blades (220) toward the center of the fan (200).

3. The electric motor (21) according to claim 2, characterized in that The wind protection ring (230) is arranged around the outer peripheral side of the plurality of fan blades (220), and the wind guide structure (240) is arranged on the fan blade (220). The wind guide structure (240) is used to guide part of the airflow at one end of the fan blade (220) close to the wind protection ring (230) to one end of the fan blade (220) close to the center of the fan (200), and blow it from the end of the fan blade (220) close to the center of the fan (200) to the radiator (300).

4. The electric motor (21) according to claim 3, characterized in that The air duct structure portion (241) comprises a guide wall (2411), and the guide wall (2411) is used to guide the airflow flowing in the direction toward the center of the fan (200) to the air outlet (244); In the axial direction of the fan (200), the guide wall (2411) and the air outlet (244) are arranged opposite to each other, and the distance between the guide wall (2411) and the air outlet (244) gradually increases from an end of the guide wall (2411) close to the center of the fan (200) to an end of the guide wall (2411) away from the center of the fan (200).

5. The electric motor (21) according to claim 3, characterized in that The air duct structure portion (241) is located at an edge of the fan blade (220) on a side close to the heat sink (300); An end of the air duct structure portion (241) close to the center of the fan (200) extends to an end of the fan blade (220) close to the center of the fan (200); and / or, One end of the air duct structure portion (241) that is away from the center of the fan (200) extends to the wind protection ring (230) and is fixedly connected to the wind protection ring (230).

6. The electric motor (21) according to claim 3, characterized in that The fan blade (220) is fixedly connected to the wind protection ring (230).

7. The electric motor (21) according to any one of claims 1 to 6, characterized in that: The heat sink (300) is arranged to be inclined relative to the axial direction of the fan (200).

8. The electric motor (21) according to any one of claims 1 to 6, 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) via 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) via the liquid supply pipe (500); the liquid cooling channel (110), the liquid return pipe (600), the radiator (300) and the liquid supply pipe (500) are used to form a cooling medium circulation loop; 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) via at least one of the liquid supply pipe (500) and the liquid return pipe (600).

9. The electric motor (21) according to any one of claims 1 to 6, characterized in that: It also includes a liquid pump (400), which is arranged on the cooling medium circulation loop and is used to drive the cooling medium to flow in the cooling medium circulation loop.

10. The electric motor (21) according to claim 9, characterized in that The electric engine (21) comprises a drive motor (700), and the liquid pump (400) comprises a pump rotor; The first output end of the drive motor (700) is transmission-connected to the pump rotor, and the drive motor (700) is used to drive the pump rotor to rotate so as to drive the cooling medium to flow; the second output end of the drive motor (700) is transmission-connected to the fan (200), and the drive motor (700) is also used to drive the fan (200); or the drive motor (700) is the pump motor of the liquid pump (400), and the liquid pump (400) is fixed on the housing of the power motor (100).

11. The electric motor (21) according to any one of claims 1 to 6, characterized in that: The radiator (300) comprises a plurality of heat dissipation flat tubes (320), the plurality of heat dissipation flat tubes (320) being arranged at intervals and forming an air flow channel between two adjacent heat dissipation flat tubes (320), the air flow channel being used for allowing the air flow on the air outlet side of the fan (200) to pass through the radiator (300) and flow to a side of the radiator (300) away from the fan (200) when the fan (200) is blowing air; Both ends of each of the heat dissipation flat tubes (320) are connected to the liquid cooling channel (110) to form the cooling medium circulation loop.

12. The electric motor (21) according to claim 11, characterized in that The radiator (300) further comprises a first liquid collecting pipe (310) and a second liquid collecting pipe (330) which are connected to each other, 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); 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 and a second section; 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 and a fourth section; One of the first section and the second section is provided with a first liquid inlet (341), and the other of the first section and the second section is provided with a first liquid outlet (342); Alternatively, one of the third section and the fourth section is provided with a second liquid inlet (343), and the other of the third section and the fourth section is provided with a second liquid outlet (344); Alternatively, one of the first section and the third section is provided with a first liquid inlet (341), the other of the first section and the third section is provided with a first liquid outlet (342), one of the second section and the fourth section is provided with a second liquid inlet (343), and the other of the second section and the fourth section is provided with a second liquid outlet (344).

13. The electric motor (21) according to claim 12, 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 (312) is provided in the first section, the third partition plate (312) divides the first section into a first subsection (314) and a second subsection (315), the first liquid inlet (341) is located in the first subsection (314), a fourth partition plate (332) is provided in the third section, the fourth partition plate (332) divides the third section into a third subsection (334) and a fourth subsection (335), and the first liquid outlet (342) is located in the fourth subsection (335); And / or, a fifth partition plate (313) is provided in the second section, the fifth partition plate (313) divides the second section into a fifth sub-section (316) and a sixth sub-section (317), the second liquid outlet (344) is located in the sixth sub-section (317), a sixth partition plate (333) is provided in the fourth section, the sixth partition plate (333) divides the fourth section into a seventh sub-section (336) and an eighth sub-section (337), and the second liquid inlet (343) is located in the seventh sub-section (336).

14. The electric motor (21) according to claim 12, 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.

15. The electric motor (21) according to any one of claims 1 to 6, characterized in that The radiator (300) is a radiator with a spiral disc structure.

16. An electric propulsion device (20), characterized in that: comprising a propeller (22) and an electric motor (21) as claimed in any one of claims 1 to 15; The propeller (22) is in transmission connection with the power motor (100) of the electric engine (21), and the power motor (100) is used to drive the propeller (22) to rotate.

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