Ducted fan system and electric propulsion device

Abstract

The application discloses a ducted fan system and an electric propulsion device. The ducted fan system comprises a duct and a fan assembly. The fan assembly comprises a motor and a plurality of fan blades. The motor comprises a motor shell, a rotor core, a rotating shaft and a stator assembly. The rotor core, the rotating shaft and the stator assembly are arranged in the motor shell. An axial through hole is arranged in the rotor core. The stator assembly is arranged in the axial through hole. The stator assembly is in clearance fit with the inner wall surface of the axial through hole. The motor shell is connected to the side of the rotor core away from the axial through hole. The plurality of fan blades are integrally formed with at least one of the motor shell and the rotor core. The plurality of fan blades are arranged along the outer periphery of the motor shell and rotate around the axis of the motor under the drive of the motor. The first side of the rotating shaft is fixedly connected with the motor shell. The second side of the rotating shaft is arranged in the stator assembly and rotationally connected with the stator assembly. The application solves the problem of large vibration of the motor of the ducted fan system.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aviation technology, in particular to a ducted fan system and an electric propulsion device. BACKGROUND

[0002] The ducted fan system has the advantages of high efficiency, energy saving, compact structure, etc., and is often used in flight equipment such as unmanned aerial vehicles, short take-off and landing aircraft, etc. Among them, the core components of the ducted fan system include a motor and a fan, the motor drives the fan to rotate at high speed to accelerate the airflow movement to generate thrust. However, the motor and the fan require more assembly parts, which will increase the weight of the ducted fan system and the flight equipment, which is not conducive to the lightweight development of the flight equipment. At the same time, more assembly parts will increase the assembly difficulty of the motor, and it is easy to produce larger assembly error, which will increase the eccentricity of the motor and the vibration of the motor. SUMMARY

[0003] The main purpose of the present application is to provide a ducted fan system and an electric propulsion device to solve the problem of large vibration of the motor of the existing ducted fan system.

[0004] According to one aspect of the present application, a ducted fan system is provided, comprising:

[0005] a duct;

[0006] a fan assembly arranged in the duct, the fan assembly comprising a motor and a plurality of fan blades, the motor comprising a motor housing, a rotor core, a rotating shaft and a stator assembly, the rotor core, the rotating shaft and the stator assembly are arranged in the motor housing, a first channel is arranged through the rotor core in the axial direction, the stator assembly is arranged in the first channel, and the stator assembly is in clearance fit with the inner wall surface of the first channel along the radial direction of the rotor core, the motor housing is connected to the side of the rotor core away from the first channel, a plurality of the fan blades are integrally formed with at least one of the motor housing and the rotor core, a plurality of the fan blades are arranged in intervals along the outer periphery of the motor housing and rotate around the axis of the motor under the drive of the motor, along the length direction of the rotating shaft, the first side of the rotating shaft is fixedly connected with the motor housing, and the second side of the rotating shaft penetrates the stator assembly and is rotatably connected with the stator assembly.

[0007] Further, the motor housing comprises a cylinder body and a first end cover, the first end cover is arranged at one end of the cylinder body along the axial direction of the cylinder body, an annular groove is arranged on one side of the first end cover close to the cylinder body, the rotating shaft is located in the annular groove close to the end of the motor housing and is fixedly connected with the first end cover, and the rotating shaft, the cylinder body and the first channel are coaxially arranged, and the rotor core is arranged on the inner wall surface of the cylinder body.

[0008] Further, the stator assembly comprises:

[0009] a stator base arranged in the first channel, a second channel passing through the stator base is arranged along the axial direction of the rotor core, and the second channel is coaxially arranged with the first channel;

[0010] a stator component arranged on the outer side wall of the stator base and located in the first channel, and the stator component is in clearance fit with the first channel;

[0011] wherein the rotating shaft is arranged in the second channel along the axial direction of the rotor core and is rotatably connected with the inner wall surface of the second channel through a rotating component.

[0012] Further, the rotating component comprises at least two rolling bearings, the at least two rolling bearings are arranged on the rotating shaft and are fixedly connected with the inner wall surface of the second channel, and the at least two rolling bearings are arranged in a spaced manner along the length direction of the rotating shaft.

[0013] Further, the rolling bearing comprises a first bearing and a second bearing, the first bearing and the second bearing are arranged on the rotating shaft and are arranged in a spaced manner along the length direction of the rotating shaft, and the first bearing is arranged on the first side of the second bearing close to the rotating shaft;

[0014] wherein the motor housing and the duct are provided with a support assembly, the support assembly is rotatably connected with the motor housing through a third bearing, and the third bearing is located on the side of the second bearing away from the first bearing;

[0015] The distance between the first bearing and the second bearing is a, the distance between the second bearing and the third bearing is b, and a and b satisfy the following relationship: 1:3.1≤a:b≤1:1.

[0016] Further, the motor housing further comprises a second end cover, the second end cover is detachably buckled on the end of the cylinder body away from the first end cover;

[0017] The bypass fan system further comprises at least two groups of support assemblies, at least one group of the support assemblies being connected between the first end cover and the bypass and being rotationally connected with the first end cover, and at least another group of the support assemblies being connected between the second end cover and the bypass and being rotationally connected with the second end cover.

[0018] Further, a side of the first end cover away from the stator assembly is provided with an annular flange, a center of a groove bottom of the annular flange being coaxially arranged with a center of a groove bottom of the annular groove, and a third passage is provided through the second end cover, the third passage being coaxially arranged with the first passage.

[0019] The support assembly comprises:

[0020] A first vane fan is arranged in the bypass, the first vane fan comprising a first ring, a second ring and first vanes, the first ring being arranged coaxially with the second ring and being located in the second ring, and along a radial direction of the first ring, opposite ends of the first vanes are connected to an outer side wall of the first ring and an inner side wall of the second ring respectively, the first ring is sleeved on an outer periphery of the annular flange and is rotationally connected with the annular flange through a fourth bearing, and an outer side wall of the second ring is connected with an inner wall surface of the bypass.

[0021] A second vane fan comprises a fixed sleeve and second vanes, along a radial direction of the rotor core, opposite ends of the second vanes are connected to an outer side wall of the fixed sleeve and an inner wall surface of the bypass respectively, the fixed sleeve at least partially passes through the third passage and is connected with the stator assembly, and an inner wall surface of the third passage is rotationally connected with the fixed sleeve through a third bearing.

[0022] Further, a cooling pipeline is arranged in the stator base, along an axial direction of the rotor core, an end of the stator base is provided with a water inlet passage and a water outlet passage, two ends of the cooling pipeline are respectively communicated with the water inlet passage and the water outlet passage, and along the axial direction of the rotor core, the water inlet passage and the water outlet passage are respectively arranged opposite to the second passage at least partially.

[0023] In another aspect, the application further provides an electric propulsion device, the electric propulsion device comprising the bypass fan system.

[0024] In this application, the rotor core and motor housing, as well as at least one of the multiple fan blades and the motor housing, are integrally formed. This significantly reduces the number of parts required during the assembly of the fan and motor, lowers the weight of the fan assembly, and consequently reduces the weight of the ducted fan system and electric propulsion device. This is beneficial for the lightweight development of flight equipment and improves its load-bearing capacity and range. The reduced number of parts required during the assembly of the fan and motor also improves the assembly and production efficiency of the fan assembly, reduces errors during motor assembly, ensures high coaxiality of the motor, effectively reduces vibration during motor operation, lowers noise generated during motor operation, and ensures higher motor stability. Furthermore, the integral formation of the rotor core and motor housing, as well as at least one of the multiple fan blades and the motor housing, enhances the structural strength of the integral structure and improves the stability of the fan assembly. In addition, the rotation of the multiple fan blades accelerates the airflow within the duct. The heat generated by the rotor core can be directly dissipated through the motor housing into the duct and quickly carried away by the airflow within the duct. The rotor core can achieve heat dissipation by utilizing the airflow within the duct, fully utilizing the airflow for heat exchange and cooling. This application eliminates the need for additional heat dissipation structures for the rotor core, reducing the weight of the motor and improving its continuous operating capacity and output stability. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0026] Figure 1 This is a schematic diagram of the ducted fan system disclosed in this application (I);

[0027] Figure 2 This is a schematic diagram (II) of the ducted fan system disclosed in this application.

[0028] Figure 3 This is a schematic diagram of the structure of the fan assembly disclosed in this application;

[0029] Figure 4 This is a cross-sectional view of the fan assembly disclosed in this application;

[0030] Figure 5 This is an exploded view of the ducted fan system disclosed in this application;

[0031] Figure 6 This is a schematic diagram of the structure of the rotating shaft disclosed in this application;

[0032] Figure 7 for Figure 4 Enlarged view of point P in the middle;

[0033] Figure 8 Fig. 1 is a structural schematic diagram of a cylinder and a first end cover (I) ;

[0034] Figure 9 Fig. 2 is a structural schematic diagram of a cylinder and a first end cover (II) ;

[0035] Figure 10 Fig. 3 is a structural schematic diagram of a motor housing.

[0036] In the above drawings, the following reference signs are used:

[0037] 10, duct; 20, motor; 21, motor housing; 211, cylinder; 212, first end cover; 2121, annular groove; 2122, flow guide slope; 2123, annular flange; 213, second end cover; 2131, third channel; 22, rotor assembly; 221, rotor core; 222, first channel; 223, rotating shaft; 23, stator assembly; 231, stator base; 2311, second channel; 2312, water inlet channel; 2313, water outlet channel; 232, stator component; 233, first bearing; 234, second bearing; 30, fan blade; 40, support assembly; 41, first stationary blade fan; 411, first circular ring; 412, second circular ring; 413, first fan blade; 414, fourth bearing; 42, second stationary blade fan; 421, fixed sleeve; 422, second fan blade; 423, third bearing. DETAILED DESCRIPTION

[0038] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0039] It should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that the terms "comprise" and / or "include" as used herein indicate the presence of a feature, step, operation, device, component and / or a combination thereof.

[0040] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples herein are not intended to limit the scope of the present application unless specifically so stated. It is to be understood that the drawings are not necessarily to scale as the dimensions of the parts shown are for the purpose of illustration and description only and not to limit the scope of the application. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail but should be considered part of the specification as appropriate. In all examples shown and discussed herein, any specific values should be interpreted as merely illustrative and not as a limitation. Thus, other examples of exemplary embodiments can have different values. It is noted that like numbers and letters on opposing pages refer to like elements on both pages, thus, further discussion of like elements is not necessary.

[0041] As shown in Figures 1 to 10 The present application provides a ducted fan system. The ducted fan system includes a duct 10 and a fan assembly. The fan assembly is disposed within the duct 10. The fan assembly includes a motor 20 and a plurality of fan blades 30. The plurality of fan blades 30 are spaced apart along an outer periphery of a motor housing 21 and rotate about an axis of the motor 20 under a driving of the motor 20. The motor 20 includes the motor housing 21, a rotor assembly 22, and a stator assembly 23. The rotor assembly 22 and the stator assembly 23 are both disposed within the motor housing 21. The rotor assembly 22 includes a rotor core 221 and a rotating shaft 223. The rotor core 221 is integrally formed with at least one of the motor housing 21 and the plurality of fan blades 30.

[0042] In the embodiment, the rotor core 221 and the motor housing 21, and at least one of the plurality of fan blades 30 and the motor housing 21 are integrally formed, which significantly reduces the number of parts required in the assembly process of the fan and the motor 20, reduces the weight of the fan assembly, thereby reducing the weight of the ducted fan system and the electric propulsion device, which is conducive to the lightweight development of the flight equipment and improves the load capacity and endurance of the flight equipment. The application reduces the number of parts required in the assembly process of the fan and the motor 20, and can also improve the assembly and production efficiency of the fan assembly, reduce the error in the assembly process of the motor 20, ensure that the motor 20 has high coaxiality, effectively reduce the vibration of the motor 20 in operation, reduce the noise generated in the operation process of the motor 20, and ensure that the stability of the motor 20 is higher. At the same time, the rotor core 221 and the motor housing 21, and at least one of the plurality of fan blades 30 and the motor housing 21 are integrally formed, which can also enhance the structural strength of the integrally formed structure, and can improve the stability of the fan assembly. In addition, the rotation of the plurality of fan blades 30 can accelerate the airflow movement in the duct 10. The heat generated by the rotor core 221 can be directly dissipated to the duct 10 through the motor housing 21 and quickly taken away by the airflow in the duct 10. The rotor core 221 can dissipate heat by utilizing the airflow in the duct 10, which fully utilizes the airflow in the duct 10 to exchange heat. The application does not need to set an additional heat dissipation structure for the rotor core 221, which reduces the weight of the motor 20 and improves the continuous working capacity and output stability of the motor 20.

[0043] In one embodiment, the rotor core 221 is integrally formed with the motor housing 21. The stator assembly 23 can drive the rotor core 221 to rotate around the axis of the motor 20, and the rotor core 221 rotates synchronously with the motor housing 21, so that the motor 20 drives the plurality of fan blades 30 to rotate. Part of the heat of the rotor core 221 can be dissipated through the motor housing 21. In the assembly process of the rotor core 221, no additional parts are required between the rotor core 221 and the motor housing 21, which can reduce the weight and assembly error of the motor 20, improve the coaxiality of the motor 20, and reduce the vibration and noise in the operation process of the motor 20. In another embodiment, the motor housing 21 is integrally formed with the plurality of fan blades 30. In the assembly process of the plurality of fan blades 30, no additional parts are required between the plurality of fan blades 30 and the motor housing 21, which improves the assembly efficiency of the fan assembly.

[0044] In another embodiment, the plurality of fan blades 30, the motor housing 21 and the rotor core 221 are integrally formed. The rotor assembly 22 includes the rotor core 221. The axial direction of the rotor core 221 is parallel to the axis of the motor 20, and the radial direction of the rotor core 221 is perpendicular to the axis of the motor 20. Figure 3The first channel 222 is provided through the direction indicated by the middle arrow X. The stator assembly 23 is arranged in the first channel 222. In the radial direction of the rotor core 221, the stator assembly 23 is in clearance fit with the inner wall surface of the first channel 222. The motor housing 21 is connected to the side of the rotor core 221 away from the first channel 222. Under the action of the stator assembly 23, the rotor core 221, the motor 20 and the plurality of fan blades 30 are integrally formed and synchronously rotated. The rotation of the plurality of fan blades 30 can accelerate the airflow movement in the duct 10 to generate thrust. Specifically, no additional components are required between the rotor assembly 22 and the motor housing 21, and between the plurality of fan blades 30 and the motor housing 21, greatly reducing the weight of the fan assembly. Compared with the prior art duct fan system in which the plurality of fan blades 30, the motor housing 21 and the rotor core 221 are separately arranged, the weight of the duct fan system provided in the embodiment can be reduced by 5% to 12%, which is more conducive to the lightweight development of the flight equipment. Since the number of components required by the fan assembly is reduced, the assembly difficulty of the fan assembly is reduced, and therefore, the assembly error between the motor 20 and the fan blades 30 can be more effectively reduced, the coaxiality of the motor 20 is improved, and the vibration of the motor 20 is reduced. Compared with the prior art, the coaxiality of the fan assembly provided in the embodiment can be improved by at least 47%. The heat dissipation capacity of the rotor core 221 can also be improved, and the heat generated by the rotor core 221 can be directly dissipated to the duct 10 through the motor housing 21 and quickly taken away by the airflow in the duct 10. Compared with the prior art, the heat dissipation efficiency of the rotor core 221 provided in the embodiment can be improved by at least 60%. The rotor core 221 and the stator assembly 23 have a gap therebetween, and in the radial direction of the rotor core 221, the width of the gap can be 0.0003D±20% (the rotor core 221 is arranged in a circular ring structure, and D is the outer diameter of the rotor core 221).

[0045] wherein, as Figures 2 to 6As shown, the rotor assembly 22 also includes a rotating shaft 223. Along the length of the rotating shaft 223, a first side of the rotating shaft 223 is fixedly connected to the motor housing 21, and a second side of the rotating shaft 223 passes through the stator assembly 23 and is rotatably connected to the stator assembly 23. The stator assembly 23 can drive the integrally formed rotor core 221, the motor housing 21, and the multiple fan blades 30 to rotate around the axis of the motor 20. The fixed connection of the first side of the rotating shaft 223 to the motor housing 21 allows the motor housing 21 to drive the rotating shaft 223 to rotate synchronously. The rotatable connection of the second side of the rotating shaft 223 to the stator assembly 23 ensures the smooth rotation of the rotating shaft 223 and provides support to the stator assembly 23, ensuring that the stator assembly 23 can be stably connected to the rotating shaft 223. The two ends of the rotating shaft 223 are connected to the motor housing 21 and the stator assembly 23 respectively, so that the gap between the rotor core 221 and the stator assembly 23 is kept uniform, which can improve the uniformity of the air gap of the motor 20 and reduce the vibration and noise of the motor 20.

[0046] Among them, such as Figures 7 to 10 As shown, the motor housing 21 includes a cylindrical body 211 and a first end cover 212. Along the axial direction of the cylindrical body 211, the first end cover 212 is disposed at one end of the cylindrical body 211. An annular groove 2121 is provided on the side of the first end cover 212 near the cylindrical body 211. The end of the rotating shaft 223 near the motor housing 21 is located within the annular groove 2121 and is fixedly connected to the first end cover 212. The rotating shaft 223, the cylindrical body 211, and the first channel 222 are arranged coaxially. The rotor core 221 is disposed on the inner wall surface of the cylindrical body 211. The end of the rotating shaft 223 near the motor housing 21 is fixedly connected to the first end cover 212, ensuring the stability of the rotor assembly 22 in the axial direction of the cylindrical body 211, allowing the rotating shaft 223 to rotate synchronously with the motor housing 21, and effectively preventing axial movement of the rotating shaft 223. The inner wall of the annular groove 2121 can also be configured to be interference-fitted with the rotating shaft 223, thereby increasing the connection area between the rotating shaft 223 and the first end cover 212, enhancing the stability of the rotating shaft 223, and ensuring high coaxiality of the rotating shaft 223, the motor housing 21, and the rotor core 221. When assembling the rotating shaft 223, the end of the rotating shaft 223 can be quickly aligned with the annular groove 2121, improving the assembly efficiency of the motor 20. The rotating shaft 223 can also quickly transfer heat from the stator assembly 23 to the first end cover 212, improving the heat dissipation efficiency of the stator assembly 23.

[0047] In addition, a guide slope 2122 can be provided between the outer wall of the annular groove 2121 and the first end cover 212. The guide slope 2122 can guide the airflow in the motor housing 21 to form turbulence when it flows through the surface of the first end cover 212, thereby improving the heat dissipation efficiency of the motor 20.

[0048] Specifically, the end of the rotating shaft 223 and the bottom of the annular groove 2121 can be fixedly connected by screws.

[0049] As Figures 2 to 4 shown, in one embodiment, the motor housing 21 further comprises a second end cover 213. The second end cover 213 is detachably capped on the end of the barrel 211 away from the first end cover 212. The second end cover 213 is detachable to realize the disassembly of the rotor assembly 22 and the stator assembly 23 in the motor housing 21. The ducted fan system further comprises at least two sets of support assemblies 40. At least one set of support assemblies 40 is connected between the first end cover 212 and the duct 10 and is rotationally connected with the first end cover 212. At least another set of support assemblies 40 is connected between the second end cover 213 and the duct 10 and is rotationally connected with the second end cover 213. The at least two sets of support assemblies 40 are respectively connected with the first end cover 212 and the second end cover 213. The at least two sets of support assemblies 40 can install the motor 20 in the duct 10 so that the motor 20 can stably rotate relative to the duct 10.

[0050] The first end cover 212 is provided with an annular flange 2123 on the side away from the stator assembly 23. The center of the groove bottom of the annular flange 2123 is coaxially arranged with the center of the groove bottom of the annular groove 2121. The second end cover 213 is provided with a third passage 2131 therethrough, which is coaxially arranged with the first passage 222.

[0051] The support assembly 40 comprises a first vane fan 41 and a second vane fan 42. The first vane fan 41 is arranged in the duct 10. The first vane fan 41 comprises a first circular ring 411, a second circular ring 412 and a first fan blade 413. The first circular ring 411 is located in the second circular ring 412 and is coaxially arranged with the first circular ring 411. Along the radial direction of the first circular ring 411, the opposite ends of the first fan blade 413 are respectively connected to the outer side wall of the first circular ring 411 and the inner side wall of the second circular ring 412. The first circular ring 411 is sleeved on the outer periphery of the annular flange 2123 and is rotationally connected with the annular flange 2123 through a fourth bearing 414. The outer side wall of the second circular ring 412 is connected with the inner wall surface of the duct 10. The second vane fan 42 comprises a fixed sleeve 421 and a second fan blade 422. Along the radial direction of the rotor core 221, the opposite ends of the second fan blade 422 are respectively connected to the outer side wall of the fixed sleeve 421 and the inner wall surface of the duct 10. The fixed sleeve 421 at least partially passes through the third passage 2131 and is connected with the stator assembly 23. The inner wall surface of the third passage 2131 is rotationally connected with the fixed sleeve 421 through a third bearing 423.

[0052] The first stationary vane fan 41 is rotatably connected with the annular flange 2123 through the fourth bearing 414, the second circular ring 412 is fixed to the inner wall of the duct 10, the first stationary vane fan 41 can provide stable support for the motor 20, can bear the radial load of the rotor assembly 22, ensures the stability of the rotor assembly 22 during rotation, is conducive to reducing the vibration of the motor 20. The fixing sleeve 421 of the second stationary vane fan 42 is connected with the inner wall of the third passage 2131 through the third bearing 423, and is fixed with the stator assembly 23 at the same time, ensures the position stability of the stator assembly 23 during the operation of the motor 20, avoids the winding abrasion or magnetic gap uneven caused by vibration. The first stationary vane fan 41 is located in the duct 10, converts the rotating airflow output by the plurality of fan blades 30 outside the motor shell 21 into axial airflow through the first fan blade 413, reduces the airflow vortex and kinetic energy loss, and improves the overall thrust efficiency of the duct 10. The second stationary vane fan 42 further straightens the airflow through the second fan blade 422, especially suppresses the turbulent flow in the outlet area of the duct 10, and at the same time can convert part of the airflow kinetic energy into pressure energy, improves the pressurization capacity of the fan. The annular flange 2123 is located outside the first end cover 212, the annular flange 2123 is coaxial with the axis of the motor 20, ensures that the first circular ring 411 and the second circular ring 412 of the first stationary vane fan 41 are strictly coaxial with the rotor assembly 22, avoids the radial disturbance of the airflow caused by eccentricity.

[0053] In one embodiment, the stator assembly 23 comprises a stator base 231 and a stator component 232. The stator base 231 is arranged in the first channel 222 along the axial direction of the rotor core 221, and the second channel 2311 is arranged through the stator base 231. The second channel 2311 is coaxially arranged with the first channel 222. The stator component 232 is sleeved on the outer side wall of the stator base 231 and located in the first channel 222, and the stator component 232 is in clearance fit with the first channel 222. The shaft 223 is arranged through the second channel 2311 along the axial direction of the rotor core 221 and is rotatably connected with the inner wall surface of the second channel 2311 through the rotating component. The stator base 231 serves as the support framework of the stator assembly 23 and is pre-installed in the first channel 222 of the rotor core 221 to provide an installation carrier for the stator component 232. During assembly of the stator assembly 23, the integration of the stator component 232 and the stator base 231 can be completed in advance, reducing the alignment difficulty during assembly of the whole machine and improving the production efficiency. The coaxial arrangement of the second channel 2311 and the first channel 222 ensures the concentricity of the shaft 223 after being arranged through the second channel 2311, reduces the risk of eccentric wear caused by assembly error, and prolongs the service life of the motor 20. The shaft 223 is connected with the inner wall surface of the second channel 2311 through the rotating component, which can effectively bear the radial load and axial load of the rotor assembly 22, suppress the bending deformation and vibration of the shaft 223 during operation, improve the stability of the motor 20, reduce the vibration of the motor 20 during high-speed operation, and ensure the stable operation of the motor 20 under high-speed working conditions, thereby greatly improving the reliability of the motor 20. The stator assembly 23 is integrated in the first channel 222 of the rotor core 221, which fully utilizes the axial space of the motor 20, reduces the size of the motor 20, and is beneficial to the miniaturization development of the electric propulsion device.

[0054] Specifically, the stator component 232 comprises a stator core and a winding coil, the stator core is sleeved on the stator base 231, and the winding coil is arranged on the stator core.

[0055] The rotating component comprises at least two rolling bearings. The at least two rolling bearings are sleeved on the shaft 223 and fixedly connected with the inner wall surface of the second channel 2311, and are arranged in a spaced manner along the length direction of the shaft 223. The rolling bearings can simultaneously bear the radial load such as unbalanced force of the rotor core 221 and the axial load such as thrust of the fan 10, the at least two rolling bearings are arranged in a spaced manner to form more stable support points, which can guarantee the bending deflection of the shaft 223 during high-speed rotation, reduce the uneven air gap between the stator component 232 and the rotor core 221 caused by gravity and other reasons, and significantly reduce the dynamic eccentricity of the motor 20, thereby reducing the vibration of the motor 20 during high-speed operation.

[0056] For example, the rotating component comprises at least two rolling bearings. Figure 7As shown, the rolling bearings include a first bearing 233 and a second bearing 234. Along the length direction of the rotating shaft 223, the first bearing 233 and the second bearing 234 are sleeved on the rotating shaft 223 and arranged at intervals, and the first bearing 233 is arranged on the first side of the second bearing 234 close to the rotating shaft 223. The motor housing 21 and the duct 10 are provided with a support assembly 40, the support assembly 40 is rotatably connected with the motor housing 21 through a third bearing 423, and the third bearing 423 is located on the side of the second bearing 234 away from the first bearing 233. The distance between the first bearing 233 and the second bearing 234 is a, the distance between the second bearing 234 and the third bearing 423 is b, and a and b satisfy the following relationship: 1:3.1≤a:b≤1:1. a:b can be set to one of 1:3.1, 1:3, 1:2.5, 1:2, 1:1.5, 1:1, etc. The first bearing 233 and the second bearing 234 can effectively disperse the radial load of the rotor core 221, the fan and other rotating parts, reduce the risk of bending deformation of the rotating shaft 223, ensure the air gap uniformity of the motor 20, effectively offset the influence of gravity deformation, can reduce the dynamic eccentricity of the motor 20, and reduce the vibration of the motor 20 during high-speed operation. Specifically, the eccentricity of the motor 20 can be less than 0.02mm. By dynamically simulating and optimizing the spacing between the first bearing 233, the second bearing 234 and the third bearing 423, the critical speed of the motor 20 can be increased by 30%-40%.

[0057] If a:b<1:3.1, the spacing between the first bearing 233 and the second bearing 234 is too small, and the spacing between the second bearing 234 and the third bearing 423 is too large, which causes the support points of the first bearing 233 and the second bearing 234 on the rotating shaft 223 to be too close to the first end cover 212, resulting in too small support of the motor 20 on the shaft section away from the rotor. At this time, the radial load transmitted by the second stationary vane fan 42 (through the third bearing 423) will be concentrated on the shaft section of the motor 20 away from the rotor, which may cause the rotating shaft 223 to bend and deform or the vibration to intensify. At the same time, the small spacing between the first bearing 233 and the second bearing 234 will shorten the effective support span of the rotating shaft 223, which may cause the critical speed of the motor 20 to decrease, and the motor 20 is more likely to cause resonance during high-speed operation.

[0058] If a:b>1:1, the spacing between the first bearing 233 and the second bearing 234 is large, and the spacing between the second bearing 234 and the third bearing 423 is small, the radial load of the third bearing 423 will be directly transmitted to the second bearing 234, causing the second bearing 234 to bear excessive local load. Especially under high load working condition of the fan, the second bearing 234 may appear fatigue spalling or fracture due to stress concentration. The first bearing 233 away from the third bearing 423 may be insufficiently loaded, and may cause dry friction due to uneven distribution of lubricating grease during low speed or start-stop stage.

[0059] In one embodiment, the stator base 231 is provided with a cooling pipe, the ends of the stator base 231 are provided with an inlet water channel 2312 and an outlet water channel 2313, and the two ends of the cooling pipe are communicated with the inlet water channel 2312 and the outlet water channel 2313 respectively, and the inlet water channel 2312 and the outlet water channel 2313 are arranged opposite to the second channel 2311 at least partially along the axial direction of the rotor core 221. The cooling pipe is embedded in the stator base 231 and close to the stator component 232, which shortens the heat conduction distance and improves the heat exchange efficiency. The inlet water channel 2312 and the outlet water channel 2313 are arranged opposite to the second channel 2311 at least partially, and the projection of the inlet water channel 2312 and the projection of the outlet water channel 2313 at least partially coincide with the projection of the second channel 2311 along the axial direction of the rotor core 221, which facilitates the connection of the external refrigeration equipment with the inlet water channel and the outlet water channel.

[0060] On the other hand, the present application also provides an electric propulsion device. The electric propulsion device comprises the above-mentioned bypass fan system, and therefore, the electric propulsion device comprises all the technical effects of the above-mentioned bypass fan system. Since the technical effects of the electrode assembly have been described in detail above, they will not be described here again.

[0061] In the present application, the plurality of fan blades 30, the motor 20 housing and the rotor assembly 22 are integrally formed, which effectively reduces the assembly error, reduces the vibration of the motor 20 and reduces the weight of the bypass fan system and the electric propulsion device. The first bearing 233, the second bearing 234, the third bearing 423 and the fourth bearing 414 are supported and arranged, which significantly reduces the dynamic eccentricity of the motor 20. At the same time, the axial spacing between the first bearing 233, the second bearing 234, the third bearing 423 and the fourth bearing 414 is optimized, which improves the critical speed of the rotor assembly 22 and effectively suppresses the vibration problem of the motor 20 during high-speed operation. The present application ensures the stable operation of the motor 20 under high-speed working conditions while maintaining compactness, greatly improves the reliability of the bypass fan system and the electric propulsion device, and meets the strict requirements of aviation products on reliability and light weight.

[0062] For purposes of the description hereinafter, the terms "upper", "lower", "right", "left", "rear", "front", "vertical", "horizontal", and derivatives thereof (e.g., "vertical ly", "horizontal ly", etc.) can refer to the relative positions of an apparatus or feature as shown in the drawings, and shall not be construed as limiting the present application to any particular spatial orientation. Terms concerning attachments, coupling and the like, such as "connected", "attached", "supported", and the like, can have the ordinary and accustomed meanings as understood by those skilled in the art. For example, "connected" can mean directly connected or indirectly connected through one or more intervening elements or features. Such terminology does not exclude the introduction of intermediate elements or features. Such terminology does not exclude the inclusion of topological equivalents of a recited element or equivalent structural arrangements. Such terminology does not exclude the use of other elements in between recited elements or intervening elements. Such terminology does not exclude that multiple elements can be connected to a single element.

[0063] In addition, it should be pointed out that the use of "first", "second" and the like words to qualify parts, is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as limiting the scope of protection of the present application.

[0064] The preferred embodiments of the present application are shown and described above. However, the present application can be modified and changed in various ways by those skilled in the art without departing from the spirit and scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. A ducted fan system, characterized in that, The utility model relates to a fan system of a duct, comprising: a duct; a fan assembly arranged in the duct, the fan assembly comprising a motor and a plurality of fan blades, the motor comprising a motor housing, a rotor core, a rotating shaft and a stator assembly, the rotor core, the rotating shaft and the stator assembly are arranged in the motor housing, the rotor core is provided with a first channel in the axial direction, the stator assembly is arranged in the first channel, and the stator assembly is in clearance fit with the inner wall surface of the first channel along the radial direction of the rotor core, the motor housing is connected to the side of the rotor core away from the first channel, a plurality of the fan blades are integrally formed with at least one of the motor housing and the rotor core, and the plurality of fan blades are arranged in the outer periphery of the motor housing and rotate around the axis of the motor under the drive of the motor, along the length direction of the rotating shaft, the first side of the rotating shaft is fixedly connected with the motor housing, and the second side of the rotating shaft penetrates the stator assembly and is rotatably connected with the stator assembly; the motor housing comprises a cylinder and a first end cover, the first end cover is arranged at one end of the cylinder along the axial direction of the cylinder, the side of the first end cover close to the cylinder is provided with an annular groove, the end of the rotating shaft close to the motor housing is located in the annular groove and is fixedly connected with the first end cover, and the rotating shaft, the cylinder and the first channel are coaxially arranged, and the rotor core is arranged on the inner wall surface of the cylinder; the duct fan system further comprises at least two groups of support assemblies, and at least one group of the support assemblies is connected between the first end cover and the duct and is rotatably connected with the first end cover.

2. The ducted fan system of claim 1, wherein, the stator assembly comprises: a stator base arranged in the first channel, a second channel is arranged in the stator base in the axial direction of the rotor core, and the second channel is coaxially arranged with the first channel; a stator component sleeved on the outer side wall of the stator base and located in the first channel, and the stator component is in clearance fit with the first channel; wherein the rotating shaft penetrates the second channel in the axial direction of the rotor core and is rotatably connected with the inner wall surface of the second channel through a rotating component.

3. The ducted fan system of claim 2, wherein, the rotating component comprises at least two rolling bearings, at least two rolling bearings are sleeved on the rotating shaft and fixedly connected with the inner wall surface of the second channel, and at least two rolling bearings are arranged in the length direction of the rotating shaft.

4. The ducted fan system of claim 3, wherein, the rolling bearing comprises a first bearing and a second bearing, the first bearing and the second bearing are sleeved on the rotating shaft and arranged in the length direction of the rotating shaft, and the first bearing is arranged on the first side of the second bearing close to the rotating shaft; wherein a support assembly is arranged between the motor housing and the duct, the support assembly is rotatably connected with the motor housing through a third bearing, and the third bearing is located on the side of the second bearing away from the first bearing. The distance between the first bearing and the second bearing is a, the distance between the second bearing and the third bearing is b, a and b satisfy the following relationship: 1:3.1≤a:b≤1:

1.

5. The ducted fan system of claim 2, wherein, The motor housing further comprises a second end cover which is detachably capped at an end of the barrel body away from the first end cover; At least another set of the support assembly is connected between the second end cover and the duct and rotatably connected with the second end cover.

6. The ducted fan system of claim 5, wherein, The side of the first end cover away from the stator assembly is provided with an annular flange, the center of the groove bottom of the annular flange is coaxially arranged with the center of the groove bottom of the annular groove, and a third channel is provided through the second end cover, and the third channel is coaxially arranged with the first channel; The support assembly comprises: A first stationary vane fan is arranged in the duct, the first stationary vane fan comprises a first circular ring, a second circular ring and a first fan blade, the first circular ring is arranged coaxially within the second circular ring, and along the radial direction of the first circular ring, the opposite ends of the first fan blade are respectively connected to the outer side wall of the first circular ring and the inner side wall of the second circular ring, and the first circular ring is sleeved on the outer periphery of the annular flange and rotatably connected with the annular flange through a fourth bearing, and the outer side wall of the second circular ring is connected with the inner wall surface of the duct; A second stationary vane fan comprises a fixed sleeve and a second fan blade, along the radial direction of the rotor core, the opposite ends of the second fan blade are respectively connected to the outer side wall of the fixed sleeve and the inner wall surface of the duct, the fixed sleeve at least partially passes through the third channel and is connected with the stator assembly, and the inner wall surface of the third channel is rotatably connected with the fixed sleeve through a third bearing.

7. The ducted fan system according to any one of claims 2 to 4, wherein, A cooling pipeline is arranged in the stator base, along the axial direction of the rotor core, the end of the stator base is provided with a water inlet channel and a water outlet channel, the two ends of the cooling pipeline are respectively communicated with the water inlet channel and the water outlet channel, and along the axial direction of the rotor core, the water inlet channel and the water outlet channel are respectively arranged opposite to the second channel.

8. An electric propulsion device, characterized by The electric propulsion device comprises the ducted fan system according to any one of claims 1 to 7.

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