Ducted fan structure

Abstract

The invention discloses a ducted fan structure and aims to provide a ducted fan structure beneficial to noise reduction, the ducted fan structure comprises a motor base and an annular outer cover, the motor base is located in the outer cover and located in the center of the bottom of the outer cover, a motor and a plurality of guide vanes are arranged on the motor base, one end of the motor is detachably connected with the motor base, and the other end of the motor is detachably connected with the guide vanes. The other end of the motor is an output end and is provided with a fan, the fan is located in the top of the outer cover and detachably connected with the output end of the motor, the multiple guide blades are evenly distributed in the circumferential direction of the motor base, the motor base is detachably connected with the inner side wall of the outer cover through the guide blades, the outer cover is provided with multiple hanging lugs, and the hanging lugs are fixedly connected with the outer side wall of the outer cover. The plurality of hanging lugs form a rectangular force unloading area corresponding to the motor, the left-right width of the force unloading area is larger than the diameter of the motor, and the up-down height of the force unloading area is larger than the height of the motor. The beneficial effects of the invention are that the motor vibration is reduced, and the purpose of reducing noise is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field related to ducted fans, and in particular to a ducted fan structure. Background Art

[0002] Ducted fans are a common propulsion method that helps improve the propulsion efficiency of aircraft and reduce carbon emissions and energy loss.

[0003] The ducted fan power system relies on a lithium power supply or a DC power supply to drive a high-power brushless motor, which drives the fan to rotate at high speed. The fan inhales air and performs work on it, increasing the total pressure and speed of the airflow. After the air enters the stator, the linear velocity of the airflow is cut off. The airflow is discharged at high speed from the tail to obtain thrust. The ducted fan power system has the characteristics of high efficiency, high thrust-to-weight ratio and low cost. As a power system, it has been widely used in fields such as drones and helicopters, and has an important impact on the performance of aircraft.

[0004] Existing brushless motor ducted fans are usually not designed to reduce noise, especially the noise caused by motor vibration is particularly loud. Therefore, they cannot meet the requirements of larger take-off weight and high-quality UAV design. Summary of the invention

[0005] The present invention aims to overcome the drawback of the prior art that the ducted fan has high noise, and provides a ducted fan structure that is beneficial to reducing noise.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A ducted fan structure comprises a motor base and an annular outer cover, wherein the motor base is located inside the outer cover and at the bottom center of the outer cover, the motor base is provided with a motor and a plurality of guide vanes, one end of the motor is detachably connected to the motor base, the other end of the motor is an output end and is provided with a fan, the fan is located inside the top of the outer cover and is detachably connected to the output end of the motor, a plurality of guide vanes are evenly distributed along the circumference of the motor base, the motor base is detachably connected to the inner side wall of the outer cover through the guide vanes, a plurality of hanging ears are provided on the outer cover, the hanging ears are fixedly connected to the outer side wall of the outer cover, the plurality of hanging ears form a rectangular unloading area and correspond to the motor, the left and right widths of the unloading area are greater than the diameter of the motor, and the upper and lower heights of the unloading area are greater than the height of the motor.

[0007] The motor seat is located in the outer cover and at the bottom center of the outer cover. The motor seat is provided with a motor and a plurality of guide vanes. One end of the motor is detachably connected to the motor seat. The other end of the motor is an output end and is provided with a fan. The fan is located in the top of the outer cover and is detachably connected to the output end of the motor. The plurality of guide vanes are evenly distributed along the circumference of the motor seat. The motor seat is detachably connected to the inner side wall of the outer cover through the guide vanes. The outer cover is provided with a plurality of hanging ears, which are fixedly connected to the outer side wall of the outer cover. The plurality of hanging ears form a rectangular unloading area and correspond to the motor. The left and right widths of the unloading area are greater than the diameter of the motor, and the upper and lower heights of the unloading area are greater than the height of the motor. The fan, as a rotating component, provides lift for the ducted fan, and the guide vane's function is to guide the flow to improve the aerodynamic efficiency of the ducted fan and reduce unnecessary kinetic energy loss. The guide vane also serves as a fan support structure. The main consideration for selecting a larger number of guide vanes is to improve the overall stiffness of the ducted fan and ensure the coaxiality and blade tip clearance between the duct body and the fan. The ears on the outer cover facilitate the installation and fixation of the ducted fan to the corresponding beams. The number of ears is generally preferably 4, and a rectangular unloading area is formed by a number of ears, which is convenient for limiting the vibration generated by the motor within the unloading area and transmitting it outward through the ears, respectively unloading the left and right directions and the up and down directions, thereby reducing the vibration of the motor and achieving the purpose of reducing noise.

[0008] Preferably, the left and right sides of the outer cover are provided with hanging holes corresponding to the center of the motor, and the line connecting the center of the unloading zone to the center of the motor and the line connecting the hanging holes to the center of the motor are perpendicular to each other. The hanging holes facilitate the installation and fixation of the ducted fan to the corresponding crossbeam, thereby facilitating the unloading of the vibration of the motor in the front and rear directions, further achieving the effect of reducing noise.

[0009] Preferably, the outer cover and the fan are formed in one piece after being coated with carbon fiber composite materials, which is beneficial to effectively control the structural weight while ensuring the structural strength.

[0010] Preferably, the inner side wall of the top opening of the outer cover forms an arc surface 1 open to the outside, the top of the arc surface 1 is far away from the fan, the bottom of the arc surface 1 is close to the fan, and the radius of the arc surface 1 gradually decreases from the top to the bottom. The arc surface design at the top opening of the outer cover is conducive to reducing air resistance, reducing noise, and facilitating the improvement of the lifting force of the aircraft.

[0011] Preferably, the outer wall of the bottom opening of the outer cover forms an inwardly contracted arc surface 2, the top of the arc surface 2 is close to the fan, the bottom of the arc surface 2 is far away from the fan, and the radius of the arc surface 2 gradually increases from the top to the bottom. The arc surface design at the bottom opening of the outer cover is conducive to reducing air resistance, reducing noise, and facilitating the improvement of the lifting force of the aircraft.

[0012] Preferably, the shape of the motor seat is circular, the motor can be detachably mounted on the end plane of the motor seat, the two ends of the guide vane are respectively fixedly connected with flange piece 1 and flange piece 2, one end of the guide vane can be detachably fixedly connected after being completely fitted with the outer circumference of the motor seat through flange piece 1, and the flange pieces 1 on a plurality of guide vanes together form a circular ring structure that completely covers the outer circumference of the motor seat, the inner side wall of the outer cover is provided with a plurality of mounting grooves matching flange piece 2, the other end of the guide vane can be detachably connected with the inner side wall of the outer cover after being embedded in the corresponding mounting groove through flange piece 2, and the flange piece 2 and the inner side wall of the outer cover are on the same arc surface. The connection position and structural design of the motor and the guide vane with the motor seat respectively ensure that the gap between the fan and the guide vane is as small as possible, improve the aerodynamic efficiency, and at the same time reduce the axial length of the entire duct as a whole, and reduce the weight; the structural design and matching method of flange piece 1 and flange piece 2 facilitate the installation and removal of the guide vane on the one hand, and on the other hand, help reduce air resistance and reduce noise.

[0013] Preferably, the guide vane is a solid structure, which is beneficial to improving the supporting strength.

[0014] As another preferred embodiment, the motor is located at one end of the motor base, a groove is provided at the other end of the motor base, a water channel is provided in the guide vane, a water hole 1 connected to one end of the water channel is provided on the side wall of the groove, and a water hole 2 connected to the other end of the water channel is provided on the outer cover. The guide vanes are grouped in pairs to form a water cooling circuit. The present invention integrates the cooling system with the guide vanes, and uses the guide vanes to take away the heat generated by the motor through cooling water, which is beneficial to the heat dissipation of the motor and is convenient for reducing the system weight of the aircraft; the ducted fan can select 4 of the guide vanes for cooling, and the remaining guide vanes can be solid or hollow.

[0015] Preferably, the motor includes an outer shell and a rotor mounting shell, a stator is provided in the outer shell, one end of the stator is detachably connected to the motor seat, the rotor mounting shell is located at the other end of the stator, a rotating shaft is provided at the center of the stator, one end of the rotating shaft is rotatably connected to the stator, the other end of the rotating shaft is detachably fixedly connected to the center of the rotor mounting shell, one side edge of the rotor mounting shell is detachably fixedly connected to the outer shell, and the fan is detachably mounted on the other side corresponding to the rotor mounting shell.

[0016] Preferably, the rotor mounting shell includes an annular shell and a circular rotor body, the rotor body is located in the shell, the center of the rotor body is fixedly connected to the rotating shaft, a plurality of guide vanes evenly distributed along the circumference of the rotor body are provided on the circumferential surface of the rotor body, the rotor body is fixedly connected to the inner wall of the shell through the guide vanes, one side of the rotor body is close to the stator, and the other side of the rotor body corresponding to the rotor body is far away from the stator, the fan is detachably mounted on the side of the rotor body away from the stator and is located outside the shell, one end of the shell is detachably fixedly connected to the outer shell, and the guide vane is located inside the other end of the shell. The design of the guide vane facilitates the diversion of gas, thereby facilitating the heat dissipation of the motor and extending the service life of the motor.

[0017] Preferably, the fan includes a circular pressure cover and a plurality of blades, the plurality of blades are evenly distributed along the circumference of the rotor body, the blades include a connecting portion, a rotating blade portion and a torsion portion, the connecting portion is fixedly connected to the rotating blade portion through the torsion portion and forms an integral body, the connecting portion is flat, the torsion portion and the connecting portion are not on the same plane, the connecting portion is located between the pressure cover and the rotor body and is detachably connected to the rotor body through the pressure cover. The blades of the ducted fan adopt a modular design, and the number of blades can be adjusted according to the parameters of the prototype. At the same time, the weight of the system can be further reduced by controlling the number of installed blades; the connecting part is flat, which is convenient for the connecting part to be installed between the gland and the rotor body, and is fixed by tightening the gland bolts. The torsion part and the connecting part are not on the same plane, so that the torsion part can play a certain limiting role, which is beneficial to ensure that the connecting part can be completely located between the gland and the rotor body, thereby ensuring the connection strength of the blades and ensuring the coaxiality of the entire fan and the motor; the present invention has a plurality of blades that are detachably connected to the rotor body directly through the gland. On the basis of ensuring the coaxiality, the structure is simple, which is beneficial to saving costs and facilitating the installation and disassembly of the fan. At the same time, it is beneficial to reduce the axial length of the entire duct as a whole and reduce the weight.

[0018] Preferably, one end surface of the connecting portion is an arc-shaped structure cocentric with the gland and flush with the inner circumference of the gland, and the other end of the connecting portion is fixedly connected to the rotating blade portion through the torsion portion and forms an integral body. One end surface of the connecting portion is flush with the inner circumference of the gland, which is conducive to further improving the coaxiality of the fan and the motor.

[0019] Preferably, the torsion part is twisted at the same angle along the front-rear direction on both sides to form a curved surface structure with uniform surface transition, one end of the torsion part is connected with the connection part and corresponds to the outer circumference of the gland, and the rotating blade part is located at the extension of the other end of the torsion part and is inclined. The structural design of the torsion part is conducive to ensuring the smoothness of the blade surface and improving the lift of the ducted fan on the one hand; on the other hand, it is conducive to reducing air resistance, reducing noise, and improving lifting pulling force.

[0020] Preferably, the thickness of the rotating blade portion gradually decreases from the middle to both sides to form a cutting edge, which is beneficial for the blade to cut into the air well, improves aerodynamic efficiency and helps reduce noise.

[0021] The beneficial effects of the present invention are as follows: the guide vane serves to guide the flow and improve the aerodynamic efficiency of the ducted fan, and reduce unnecessary kinetic energy loss, while the guide vane also serves as a fan support structure; the main consideration for selecting a larger number of guide vanes is to improve the overall rigidity of the ducted fan and ensure the coaxiality and blade tip clearance between the duct body and the moving blades; this is beneficial to reducing motor vibration and achieving the purpose of reducing noise; the outer cover and the fan are both integrally formed after being coated with carbon fiber composite materials, which is beneficial to effectively control the structural weight while ensuring structural strength; the curved surface design at the top opening and the bottom opening of the outer cover is beneficial to reducing air resistance, reducing noise and facilitating the improvement of the lift pull of the aircraft; the connection position and The structural design ensures that the gap between the fan and the guide vane is as small as possible, improves aerodynamic efficiency, and at the same time reduces the axial length of the entire duct as a whole, reducing weight; the structural design and matching method of flange one and flange two, on the one hand, facilitate the installation and removal of the guide vane, and on the other hand, help reduce air resistance and reduce noise; the guide vane is a solid structure, which is conducive to improving the supporting strength; the guide vanes are grouped in pairs to form a water-cooling circuit. The present invention integrates the cooling system with the guide vane, and uses the guide vane to take away the heat generated by the motor through cooling water, which is conducive to the heat dissipation of the motor and is convenient for reducing the system weight of the aircraft; the structure is simple, which is conducive to cost saving and convenient for fan installation and removal; it is conducive to ensuring the coaxiality of the entire fan and the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 and Figure 2 It is a schematic diagram of the structure of the present invention; Figure 3 It is a front view of the present invention; Figure 4 yes Figure 3 Cross-sectional view of the middle BB; Figure 5 yes Figure 4 A magnified view of the structure at C in the middle; Figure 6 yes Figure 4 A magnified view of the structure at center A; Figure 7 It is a schematic diagram of the structure of the fan blade.

[0023] In the figure: 1. motor base, 2. outer cover, 3. motor, 4. guide vane, 5. fan, 6. hanging ear, 7. unloading area, 8. hanging hole, 9. arc surface one, 10. arc surface two, 11. flange one, 12. flange two, 13. mounting groove, 14. groove, 15. water channel, 16. water hole one, 17. water hole two, 18. outer shell, 19. rotor mounting shell, 20. stator, 21. rotating shaft, 22. shell, 23. rotor body, 24. guide vane, 25. gland, 26. fan blade, 27. cutting edge, 28. rotating blade part, 29. torsion part, 30. connecting part. DETAILED DESCRIPTION

[0024] The technical solutions 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 only part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. 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.

[0025] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] Unless otherwise specified, the relative arrangement of the components, numerical expressions and numerical values ​​described in these embodiments do not limit the scope of the present application. For ease of explanation, spatial relative terms such as "upper", "lower", "left", "right" are used in the embodiments to illustrate the relationship between an element or feature shown in the figure and another element or feature. It should be understood that, in addition to the orientation shown in the figure, the spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be fixed "on" other elements or features. Therefore, the exemplary term "lower" can include both upper and lower orientations. The device can be fixed in other ways (rotated 90 degrees or located in other orientations), and the spatial relative description used here can be interpreted accordingly. At the same time, it should be understood that for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, process and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, process and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.It should be noted that similar reference numerals and letters denote similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0027] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0028] like Figure 1 and Figure 2 In the described embodiment, a ducted fan structure includes a motor base 1 and an annular outer cover 2, the motor base 1 is located in the outer cover 2 and at the bottom center of the outer cover 2, a motor 3 and a plurality of guide vanes 4 are provided on the motor base 1, one end of the motor 3 is detachably connected to the motor base 1, the other end of the motor 3 is an output end and is provided with a fan 5, the fan 5 is located in the top of the outer cover 2 and is detachably connected to the output end of the motor 3, a plurality of guide vanes 4 are evenly distributed along the circumference of the motor base 1, the motor base 1 is detachably connected to the inner side wall of the outer cover 2 through the guide vanes 4, a plurality of hanging ears 6 are provided on the outer cover 2, the hanging ears 6 are fixedly connected to the outer side wall of the outer cover 2, the plurality of hanging ears 6 form a rectangular unloading area 7 and correspond to the motor 3, the left and right widths of the unloading area 7 are greater than the diameter of the motor 3, and the upper and lower heights of the unloading area 7 are greater than the height of the motor 3.

[0029] The left and right sides of the outer cover 2 are both provided with hanging holes 8 corresponding to the center of the motor 3, and the line connecting the center of the unloading area 7 to the center of the motor 3 and the line connecting the hanging holes 8 to the center of the motor 3 are perpendicular to each other.

[0030] The outer cover 2 and the fan 5 are both integrally formed after being covered with carbon fiber composite materials.

[0031] like Figure 4 As shown, the inner wall of the top opening of the outer cover 2 forms an arc surface 9 open to the outside, the top of the arc surface 9 is far away from the fan 5, the bottom of the arc surface 9 is close to the fan 5, and the radius of the arc surface 9 gradually decreases from its top to its bottom.

[0032] like Figure 4 and Figure 5 As shown, the outer wall of the bottom opening of the outer cover 2 forms an inwardly contracted arc surface 10, the top of the arc surface 10 is close to the fan 5, the bottom of the arc surface 10 is away from the fan 5, and the radius of the arc surface 10 gradually increases from its top to its bottom.

[0033] like Figure 1 , Figure 4 and Figure 5 As shown, the shape of the motor base 1 is circular, and the motor 3 can be detachably mounted on the end plane of the motor base 1. The two ends of the guide vane 4 are respectively fixedly connected with a flange piece 11 and a flange piece 2 12. One end of the guide vane 4 can be detachably fixedly connected with the outer circumferential surface of the motor base 1 after the flange piece 11 is completely fitted, and the flange pieces 11 on several guide vanes 4 together form a circular ring structure that completely covers the outer circumferential surface of the motor base 1. The inner wall of the outer cover 2 is provided with several mounting grooves 13 that match the flange piece 2 12. The other end of the guide vane 4 is detachably connected with the inner wall of the outer cover 2 after being embedded in the corresponding mounting groove 13 through the flange piece 2 12. The flange piece 2 12 and the inner wall of the outer cover 2 are on the same arc surface.

[0034] According to actual needs, in order to ensure strength, the guide vane 4 can be a solid structure.

[0035] At the same time, according to actual needs, in order to facilitate the cooling of the motor 3, as Figure 4 , Figure 5 and Figure 6 As shown, the motor 3 is located at one end of the motor base 1, a groove 14 is provided at the other end of the motor base 1, a water channel 15 is provided in the guide vane 4, a water hole 16 connected to one end of the water channel 15 is provided on the side wall of the groove 14, and a water hole 2 17 connected to the other end of the water channel 15 is provided on the outer cover 2.

[0036] like Figure 1 , Figure 2 and Figure 4As shown, the motor 3 includes a shell 18 and a rotor mounting shell 19, a stator 20 is provided in the shell 18, one end of the stator 20 is detachably connected to the motor base 1, the rotor mounting shell 19 is located at the other end of the stator 20, a rotating shaft 21 is provided at the center of the stator 20, one end of the rotating shaft 21 is rotatably connected to the stator 20, the other end of the rotating shaft 21 is detachably fixedly connected to the center of the rotor mounting shell 19, one side edge of the rotor mounting shell 19 is detachably fixedly connected to the shell 18, and the fan 5 is detachably installed on the other side corresponding to the rotor mounting shell 19.

[0037] like Figure 4 As shown, the rotor mounting shell 19 includes a ring-shaped shell 22 and a circular rotor body 23, the rotor body 23 is located in the shell 22, the center of the rotor body 23 is fixedly connected to the rotating shaft 21, a plurality of guide vanes 24 are provided on the circumferential surface of the rotor body 23 and are evenly distributed along its circumference, the rotor body 23 is fixedly connected to the inner wall of the shell 22 through the guide vanes 24, one side of the rotor body is close to the stator 20, and the other side of the rotor body 23 corresponding to the rotor body 23 is far away from the stator 20, the fan 5 is detachably mounted on the side of the rotor body 23 away from the stator 20 and is located outside the shell 22, one end of the shell 22 is detachably fixedly connected to the outer shell 18, and the guide vane 24 is located in the other end of the shell 22.

[0038] like Figure 2 , Figure 3 , Figure 4 and Figure 7 As shown, the fan 5 includes a circular pressure cover 25 and a plurality of blades 26, and the plurality of blades 26 are evenly distributed along the circumference of the rotor body 23. The blades 26 include a connecting portion 30, a rotating blade portion 28 and a torsion portion 29. The connecting portion 30 is fixedly connected to the rotating blade portion 28 through the torsion portion 29 and forms a whole. The connecting portion 30 is flat, and the torsion portion 29 and the connecting portion 30 are not on the same plane. The connecting portion 30 is located between the pressure cover 25 and the rotor body 23 and is detachably connected to the rotor body 23 through the pressure cover 25.

[0039] like Figure 7 As shown, one end face of the connecting portion 30 is an arc-shaped structure cocentric with the gland 25 and flush with the inner circumference of the gland 25. The other end of the connecting portion 30 is fixedly connected to the rotary blade portion 28 through the twisting portion 29 and forms an integral body. The twisting portion 29 is twisted at the same angle along the front-back direction on both sides to form a curved surface structure with a uniform surface transition. One end of the twisting portion 29 is connected to the connecting portion 30 and corresponds to the outer circumference of the gland 25. The rotary blade portion 28 is located at the extension of the other end of the twisting portion 29 and is inclined. The thickness of the rotary blade portion 28 gradually decreases from the middle to both sides to form a cut edge 27.

[0040] In the present invention, the blades 26 of the ducted fan adopt a modular design, and the number of blades 26 can be adjusted according to the parameters of the prototype. At the same time, the weight of the system can be further reduced by controlling the number of installed blades 26. The final number of installed blades 26 in this scheme is expected to be 7. The support structure of the ducted fan is composed of 11 guide vanes 4. The fan 5 is a rotating component that provides lift for the ducted fan. The function of the guide vanes 4 is to guide the flow to improve the aerodynamic efficiency of the ducted fan and reduce unnecessary kinetic energy loss. At the same time, the guide vanes 4 also serve as the support structure of the fan 5. The main consideration for selecting a larger number of guide vanes 4 is to improve the overall stiffness of the ducted fan and ensure the coaxiality and clearance between the duct body and the blades 26.

[0041] According to actual needs, in order to improve the support strength, the guide vane 4 can adopt a solid structure. If the motor 3 needs to be water-cooled, the guide vanes 4 can be grouped in pairs to form a water cooling circuit. The present invention integrates the cooling system with the guide vanes 4, and uses the guide vanes 4 to take away the heat generated by the motor 3 through cooling water, which is beneficial to the heat dissipation of the motor 3 and convenient for reducing the system weight of the aircraft; the ducted fan can also be selected as one in which 4 guide vanes 4 are grouped in pairs to form two water cooling circuits for cooling, and the remaining guide vanes 4 can be solid or hollow.

[0042] The ears 6 on the outer cover 2 facilitate the installation and fixation of the ducted fan with the corresponding crossbeam; the number of ears 6 is generally preferably 4, and a rectangular unloading area 7 is formed by the four ears 6, which is convenient for limiting the vibration generated by the motor 3 within the unloading area 7, and transmitting it outward through the ears 6, respectively unloading the force in the left and right directions and the up and down directions, thereby facilitating the reduction of the vibration of the motor 3 and achieving the purpose of reducing noise. The hanging holes 8 on the left and right sides of the outer cover 2 facilitate the installation and fixation of the ducted fan with the corresponding crossbeam, thereby facilitating the unloading of the vibration of the motor 3 in the front and back directions, further achieving the effect of reducing noise.

[0043] In order to reduce the structural weight of the aerial module, the outer cover 2 and the fan 5 are both integrally formed after being covered with carbon fiber composite materials, which effectively controls the structural weight while ensuring the structural strength.

[0044] The curved surface design at the top opening of the outer cover 2 and the curved surface design at the bottom opening of the outer cover 2 are conducive to reducing air resistance, reducing noise and facilitating the improvement of the lifting force of the aircraft.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A ducted fan structure, characterized in that: The invention comprises a motor base (1) and a circular outer cover (2), wherein the motor base (1) is located inside the outer cover (2) and at the bottom center of the outer cover (2), and a motor (3) and a plurality of guide vanes (4) are provided on the motor base (1), one end of the motor (3) is detachably connected to the motor base (1), and the other end of the motor (3) is an output end and is provided with a fan (5), wherein the fan (5) is located inside the top of the outer cover (2) and is detachably connected to the output end of the motor (3), and the plurality of guide vanes (4) are provided on the motor base (1). The motor base (1) is evenly distributed along the circumference of the motor base (1), the motor base (1) is detachably connected to the inner wall of the outer cover (2) through the guide vane (4), the outer cover (2) is provided with a plurality of hanging ears (6), the hanging ears (6) are fixedly connected to the outer wall of the outer cover (2), the plurality of hanging ears (6) form a rectangular unloading area (7) and correspond to the motor (3), the left and right width of the unloading area (7) is greater than the diameter of the motor (3), and the upper and lower heights of the unloading area (7) are greater than the height of the motor (3).

2. A ducted fan structure according to claim 1, characterized in that: The left and right sides of the outer cover (2) are both provided with hanging holes (8) corresponding to the center of the motor (3), and the line connecting the center of the unloading area (7) to the center of the motor (3) and the line connecting the hanging hole (8) to the center of the motor (3) are perpendicular to each other.

3. A ducted fan structure according to claim 1, characterized in that: The outer cover (2) and the fan (5) are both formed in one piece after being covered with carbon fiber composite material.

4. A ducted fan structure according to claim 1, characterized in that: The inner side wall at the top opening of the outer cover (2) forms an outwardly open arc surface 1 (9), the top end of the arc surface 1 (9) is away from the fan (5), the bottom end of the arc surface 1 (9) is close to the fan (5), and the radius of the arc surface 1 (9) gradually decreases from its top end to its bottom end.

5. A ducted fan structure according to claim 1 or 2 or 3 or 4, characterized in that: The outer wall of the bottom opening of the outer cover (2) forms an inwardly contracted arc surface 2 (10), the top end of the arc surface 2 (10) is close to the fan (5), the bottom end of the arc surface 2 (10) is away from the fan (5), and the radius of the arc surface 2 (10) gradually increases from its top end to its bottom end.

6. A ducted fan structure according to claim 1, characterized in that: The motor seat (1) is circular in shape, the motor (3) is detachably mounted on the end plane of the motor seat (1), the two ends of the guide vane (4) are respectively fixedly connected with a flange piece 1 (11) and a flange piece 2 (12), one end of the guide vane (4) is detachably fixedly connected to the outer circumferential surface of the motor seat (1) through the flange piece 1 (11), and the flange pieces 1 (11) on a plurality of guide vanes (4) together form a circular ring structure that completely covers the outer circumferential surface of the motor seat (1), the inner side wall of the outer cover (2) is provided with a plurality of mounting grooves (13) that match the flange piece 2 (12), the other end of the guide vane (4) is detachably connected to the inner side wall of the outer cover (2) after being embedded in the corresponding mounting groove (13) through the flange piece 2 (12), and the flange piece 2 (12) and the inner side wall of the outer cover (2) are on the same arc surface.

7. A ducted fan structure according to claim 1 or 2 or 3 or 4 or 6, characterized in that: The guide vane (4) is a solid structure.

8. A ducted fan structure according to claim 1 or 2 or 3 or 4 or 6, characterized in that: The motor (3) is located at one end of the motor base (1), the other end of the motor base (1) is provided with a groove (14), a water channel (15) is provided in the guide vane (4), a water hole (16) connected to one end of the water channel (15) is provided on the side wall of the groove (14), and a water hole (17) connected to the other end of the water channel (15) is provided on the outer cover (2).

9. The ducted fan structure according to claim 1, characterized in that: The motor (3) comprises an outer shell (18) and a rotor mounting shell (19), wherein a stator (20) is arranged in the outer shell (18), one end of the stator (20) is detachably connected to the motor base (1), and the rotor mounting shell (19) is located at the other end of the stator (20), a rotating shaft (21) is arranged at the center of the stator (20), one end of the rotating shaft (21) is rotatably connected to the stator (20), and the other end of the rotating shaft (21) is detachably fixedly connected to the center of the rotor mounting shell (19), one side edge of the rotor mounting shell (19) is detachably fixedly connected to the outer shell (18), and the fan (5) is detachably mounted on the other side corresponding to the rotor mounting shell (19).

10. A ducted fan structure according to claim 9, characterized in that: The rotor mounting shell (19) comprises a ring-shaped shell (22) and a circular rotor body (23); the rotor body (23) is located in the shell (22); the center of the rotor body (23) is fixedly connected to the rotating shaft (21); a plurality of guide vanes (24) are provided on the circumferential surface of the rotor body (23) and are evenly distributed along the circumference thereof; the rotor body (23) is fixedly connected to the inner side wall of the shell (22) via the guide vanes (24); one side of the rotor body is close to the stator (20); the other side of the rotor body (23) is away from the stator (20); the fan (5) is detachably mounted on the side of the rotor body (23) away from the stator (20) and is located outside the shell (22); one end of the shell (22) is detachably fixedly connected to the outer shell (18); and the guide vanes (24) are located in the other end of the shell (22).

11. A ducted fan structure according to claim 10, characterized in that: The fan (5) comprises a circular gland (25) and a plurality of blades (26), wherein the plurality of blades (26) are evenly distributed along the circumference of the rotor body (23), and the blades (26) comprise a connecting portion (30), a rotating blade portion (28) and a torsion portion (29), wherein the connecting portion (30) is fixedly connected to the rotating blade portion (28) via the torsion portion (29) and forms an integral body, the connecting portion (30) is flat, the torsion portion (29) and the connecting portion (30) are not on the same plane, and the connecting portion (30) is located between the gland (25) and the rotor body (23) and is detachably connected to the rotor body (23) via the gland (25).

12. A ducted fan structure according to claim 11, characterized in that: One end surface of the connecting portion (30) is an arc-shaped structure cocentric with the gland (25) and flush with the inner circumferential surface of the gland (25); the other end of the connecting portion (30) is fixedly connected to the rotary blade portion (28) via a torsion portion (29) to form an integral body.

13. A ducted fan structure according to claim 11 or 12, characterized in that: The twisting portion (29) is twisted at the same angle on both sides along the front-rear direction to form a curved surface structure with a uniform transition on the surface. One end of the twisting portion (29) is connected to the connecting portion (30) and corresponds to the outer circumferential surface of the gland (25). The rotary blade portion (28) is located at the extension of the other end of the twisting portion (29) and is inclined.

14. A ducted fan structure according to claim 11 or 12, characterized in that: The thickness of the spiral blade portion (28) gradually decreases from the middle to both sides thereof to form a cutting edge (27).

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