Fan blade assembly for ducted fan

Abstract

The utility model discloses a fan blade assembly for a ducted fan, and aims to provide a fan blade assembly for a ducted fan, which is favorable for saving cost and comprises an outer rotor motor, a fan coaxial with the outer rotor motor is arranged at the output end of the outer rotor motor, and the fan comprises a gland and a plurality of fan blades. The multiple fan blades are evenly distributed in the circumferential direction of the outer rotor motor, each fan blade comprises a connecting part, a rotary blade part and a torsion part, the connecting parts are fixedly connected with the rotary blade parts through the torsion parts to form a whole, the connecting parts are flat, and the torsion parts and the connecting parts are not located on the same plane. The connecting part is located between the gland and the output end of the outer rotor motor and is detachably connected with the outer rotor motor through the gland. The beneficial effects of the utility model are that the connection strength of the fan blades is ensured, and the coaxiality of the whole fan and the external rotor motor is ensured; on the basis that the coaxiality is guaranteed, the structure is simple, and the purpose of saving cost is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field related to ducted fan blades, and in particular to a blade assembly for a ducted fan. 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] Ducted fan propulsion systems rely on a lithium-ion or DC power supply to drive a high-power brushless motor, which in turn drives the fan at high speed. The fan draws in air and applies work to it, increasing the total pressure and velocity of the airflow. Once the air enters the stator, its linear velocity is reduced. The air is then discharged at high speed from the tail, generating thrust. Ducted fan propulsion systems offer high efficiency, a high thrust-to-weight ratio, and low cost. As a power system, they are widely used in drones and helicopters, significantly impacting aircraft performance.

[0004] In order to ensure the coaxiality between the fan and the motor, the existing brushless motor ducted fan has a complex fan blade structure, which is cumbersome to install and disassemble, and is not conducive to cost saving. Utility Model Content

[0005] The utility model aims to overcome the disadvantage of the prior art that the ducted fan is not conducive to cost saving and provides a fan blade assembly for the ducted fan which is conducive to cost saving.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A fan blade assembly for a ducted fan, which includes an outer rotor motor, a fan coaxial with the outer rotor motor is provided on the output end of the outer rotor motor, the fan includes a pressure cover and a plurality of fan blades, the plurality of fan blades are evenly distributed along the circumference of the outer rotor motor, the fan 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 output end of the outer rotor motor and is detachably connected to the outer rotor motor through the pressure cover.

[0008] A fan coaxial with the output end of the outer rotor motor is provided, and the fan includes a pressure cover and a plurality of fan blades, and the plurality of fan blades are evenly distributed along the circumference of the outer rotor motor. The fan 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 a whole. The connecting portion is flat, and the torsion portion and the connecting portion are not on the same plane. The connecting portion is located between the pressure cover and the output end of the outer rotor motor and is detachably connected to the outer rotor motor through the pressure cover. The fan acts as a rotating component to provide lift for the ducted fan; the connecting portion is flat, making it easy for the connecting portion to be installed between the gland and the output end of the outer rotor motor, and to be fixed by tightening the gland bolts; the torsion portion and the connecting portion are not on the same plane, so that the torsion portion can play a certain limiting role, which is conducive to ensuring that the connecting portion can be completely located between the gland and the output end of the outer rotor motor, thereby ensuring the connection strength of the fan blades while ensuring the coaxiality of the entire fan and the outer rotor motor; the utility model has a plurality of fan blades that are directly detachably connected to the output end of the outer rotor motor through the gland. On the basis of ensuring coaxiality, the structure is simple, achieving the purpose of cost saving, facilitating the installation and disassembly of the fan, and at the same time helping to reduce the overall axial length of the entire duct and reduce weight. The blades of the ducted fan adopt a modular design, and the number of blades can be adjusted according to the prototype parameters. At the same time, the system weight can be further reduced by controlling the number of installed blades.

[0009] Preferably, the gland is annular in shape, one end surface of the connecting portion is an arc-shaped structure concentric with the gland and flush with the inner circumference of the gland. The other end of the connecting portion is fixedly connected to the rotating blade portion via a torsion portion to form an integral body. The one end surface of the connecting portion is flush with the inner circumference of the gland, thereby further improving the coaxiality between the fan and the outer rotor motor.

[0010] Preferably, the twisting portion is formed by twisting its left and right sides forward and backward by the same angle to form a curved structure with a uniform transition. One end of the twisting portion is connected to the connecting portion and corresponds to the outer circumference of the gland. The rotating blade portion is located at the other end of the twisting portion and is inclined. This structural design of the twisting portion not only helps ensure the smoothness of the blade surface and enhance the lift of the ducted fan, but also helps reduce air resistance, lower noise, and enhance lift.

[0011] Preferably, the thickness of the rotating blade portion gradually decreases from the middle to both sides thereof to form a cutting edge, which is beneficial for the fan blade to cut into the air well, improves aerodynamic efficiency and helps reduce noise.

[0012] Preferably, the connecting portion is fixedly connected to the rotor portion via the torsion portion and is integrally formed after being coated with carbon fiber composite material, thereby effectively controlling the structural weight while ensuring structural strength.

[0013] Preferably, the outer rotor motor includes a stator and a rotor mounting shell, one end of the stator is provided with a shell, and the rotor mounting shell is located at the other end of the stator. A rotating shaft is provided in the center of the stator, one end of the rotating shaft is rotatably connected to the stator, and 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 shell, and the fan blades are detachably mounted on the other side corresponding to the rotor mounting shell through a pressure cover.

[0014] Preferably, the rotor mounting shell includes an annular shell and a circular rotor body, the rotor body is located inside the shell, the center of the rotor body is fixedly connected to the rotating shaft, a plurality of guide vanes are provided on the circumferential surface of the rotor body and are evenly distributed along its circumference, the rotor body is fixedly connected to the inner side 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 is away from the stator, the fan blades are detachably mounted on the side of the rotor body away from the stator through a pressure cover and are located outside the shell, one end of the shell is detachably fixedly connected to the outer shell, and the guide vanes are located inside the other end of the shell. The design of the guide vanes facilitates the diversion of gas, thereby facilitating the heat dissipation of the motor and extending the service life of the motor.

[0015] The beneficial effects of the present invention are: while ensuring the connection strength of the fan blades, it is conducive to ensuring the coaxiality of the entire fan and the outer rotor motor; on the basis of ensuring the coaxiality, the structure is simple, which achieves the purpose of cost saving, facilitates the installation and disassembly of the fan, and at the same time helps to reduce the axial length of the entire duct as a whole and reduce the weight; the end face of one end of the connecting part is flush with the inner circumferential surface of the pressure cover, which helps to further improve the coaxiality of the fan and the outer rotor motor; the structural design of the torsion part, on the one hand, helps to ensure the smoothness of the fan blade surface and enhance the lift of the duct fan; on the other hand, it helps to reduce air resistance and reduce noise; the cutting edge helps the fan blade to cut into the air well, improves aerodynamic efficiency and helps to reduce noise; 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the utility model;

[0017] Figure 2 It is a schematic diagram of the structure of the fan blade;

[0018] Figure 3 It is the main view of the utility model;

[0019] Figure 4 yes Figure 3 Cross-sectional view of the BB.

[0020] In the figure: 1. Outer rotor motor, 2. Fan, 3. Gland, 4. Blades, 5. Connecting portion, 6. Rotating blade portion, 7. Torsional portion, 8. Cutting edge, 9. Stator, 10. Rotor mounting housing, 11. Outer casing, 12. Shaft, 13. Housing, 14. Rotor body, 15. Guide vanes. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way 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 making creative work are within the scope of protection of this application.

[0022] 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, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0023] Unless otherwise specified, the relative arrangement of components, numerical expressions, and values ​​described in these embodiments do not limit the scope of this application. For ease of description, spatially relative terms such as "upper," "lower," "left," and "right" are used in the embodiments to illustrate the relationship of one element or feature shown in the figures relative to another. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to encompass different orientations of the device during use or operation. For example, if the device in the figure is inverted, an element described as being "below" another element or feature would be fixed "above" the other element or feature. Therefore, the exemplary term "below" can include both upper and lower orientations. The device can be fixed in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein should be interpreted accordingly. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to scale. Technologies, processes, and equipment known to those skilled in the relevant art may not be discussed in detail, but, where appropriate, should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.It should be noted that like reference numerals and letters represent 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.

[0024] 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.

[0025] like Figure 1 、 Figure 2 and Figure 3 In the described embodiment, a fan blade assembly for a ducted fan includes an outer rotor motor 1, and a fan 2 coaxial with the outer rotor motor 1 is provided at the output end thereof. The fan 2 includes a pressure cover 3 and a plurality of fan blades 4, and the plurality of fan blades 4 are evenly distributed along the circumference of the outer rotor motor 1. The fan blades 4 include a connecting portion 5, a rotating blade portion 6 and a torsion portion 7. The connecting portion 5 is fixedly connected to the rotating blade portion 6 through the torsion portion 7 and forms an integral body. The connecting portion 5 is flat, and the torsion portion 7 and the connecting portion 5 are not on the same plane. The connecting portion 5 is located between the pressure cover 3 and the output end of the outer rotor motor 1 and is detachably connected to the outer rotor motor 1 through the pressure cover 3.

[0026] like Figure 1As shown, the shape of the gland 3 is annular, and one end face of the connecting portion 5 is an arc structure cocentric with the gland 3 and flush with the inner circumferential surface of the gland 3, and the other end of the connecting portion 5 is fixedly connected to the rotary blade portion 6 through the torsion portion 7 to form a whole.

[0027] like Figure 2 As shown, the twisting portion 7 is formed by twisting its left and right sides in the front-to-back direction at the same angle to form a curved surface structure with a uniform surface transition. One end of the twisting portion 7 is connected to the connecting portion 5 and corresponds to the outer circumference of the gland 3. The spiral blade portion 6 is located at the other end of the twisting portion 7 and is inclined. The thickness of the spiral blade portion 6 gradually decreases from the center to the sides, forming a cut edge 8.

[0028] The connecting portion 5 is fixedly connected to the rotating blade portion 6 via the torsion portion 7 and is integrally formed after being covered with carbon fiber composite material.

[0029] like Figure 4 As shown, the outer rotor motor 1 includes a stator 9 and a rotor mounting shell 10. A shell 11 is provided on one end of the stator 9. The rotor mounting shell 10 is located at the other end of the stator 9. A rotating shaft 12 is provided in the center of the stator 9. One end of the rotating shaft 12 is rotatably connected to the stator 9, and the other end of the rotating shaft 12 is detachably fixedly connected to the center of the rotor mounting shell 10. One side edge of the rotor mounting shell 10 is detachably fixedly connected to the shell 11. The fan blade 4 is detachably mounted on the other side corresponding to the rotor mounting shell 10 through the pressure cover 3.

[0030] The rotor mounting shell 10 includes a circular shell 13 and a circular rotor body 14. The rotor body 14 is located in the shell 13. The center of the rotor body 14 is fixedly connected to the rotating shaft 12. A number of guide vanes 15 are evenly distributed along the circumference of the rotor body 14. The rotor body 14 is fixedly connected to the inner wall of the shell 13 through the guide vanes 15. One side of the rotor body is close to the stator 9, and the other side of the rotor body 14 is away from the stator 9. The fan blades 4 are detachably mounted on the side of the rotor body 14 away from the stator 9 through the pressure cover 3 and are located outside the shell 13. One end of the shell 13 is detachably fixedly connected to the outer shell 11, and the guide vanes 15 are located inside the other end of the shell 13.

[0031] The fan 2 serves as a rotating component to provide lift for the ducted fan; the connecting portion 5 of the fan blade 4 is flat, which facilitates the installation of the connecting portion 5 between the end planes of the pressure cover 3 and the rotor body 14, and is fixed by tightening the bolts of the pressure cover 3; the torsion portion 7 is twisted by the same angle on its left and right sides along the front and rear directions to form a curved surface structure with a uniform transition on the surface, so that it is not on the same plane as the connecting portion 5, which is beneficial for the torsion portion 7 to play a certain limiting role, ensuring that the connecting portion 5 can be completely located between the end planes of the pressure cover 3 and the rotor body 14, thereby ensuring the connection strength of the fan blade 4 while ensuring the coaxiality of the entire fan 2 and the outer rotor motor 1; at the same time, one end face of the connecting portion 5 is flush with the inner circumferential surface of the pressure cover 3, which is beneficial to further improve the coaxiality of the fan 2 and the outer rotor motor 1. The utility model has a plurality of fan blades 4 that are directly and detachably connected to the end of the rotor body 14 through the pressure cover 3. On the basis of ensuring coaxiality, the structure is simple, which achieves the purpose of saving costs, facilitates the installation and disassembly of the fan 2, and helps to reduce the axial length of the entire duct as a whole and reduce the weight.

[0032] In the present invention, the blades 4 of the ducted fan adopt a modular design, and the number of blades 4 can be adjusted according to the prototype parameters. At the same time, the system weight can be further reduced by controlling the number of installed blades 4. The final number of installed blades 4 in this solution is expected to be 7.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention 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 make equivalent replacements for some of the technical features therein. 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 blade assembly for a ducted fan, characterized in that: The invention comprises an outer rotor motor (1), wherein a fan (2) coaxial with the outer rotor motor (1) is provided at the output end thereof, wherein the fan (2) comprises a pressure cover (3) and a plurality of fan blades (4), wherein the plurality of fan blades (4) are evenly distributed along the circumference of the outer rotor motor (1), and wherein the fan blades (4) comprise a connecting portion (5), a rotating blade portion (6) and a torsion portion (7), wherein the connecting portion (5) is fixedly connected to the rotating blade portion (6) through the torsion portion (7) and forms an integral body, wherein the connecting portion (5) is flat, and the torsion portion (7) and the connecting portion (5) are not on the same plane, and the connecting portion (5) is located between the pressure cover (3) and the output end of the outer rotor motor (1) and is detachably connected to the outer rotor motor (1) through the pressure cover (3).

2. A blade assembly for a ducted fan according to claim 1, characterized in that: The gland (3) is in the shape of a ring, one end surface of the connecting portion (5) is an arc-shaped structure cocentric with the gland (3) and flush with the inner circumferential surface of the gland (3), and the other end of the connecting portion (5) is fixedly connected to the rotary blade portion (6) via the torsion portion (7) to form a whole.

3. The blade assembly for a ducted fan according to claim 2, wherein: The twisting portion (7) is formed into a curved surface structure with a uniform transition on the surface by twisting the left and right sides thereof at the same angle in the front-back direction. One end of the twisting portion (7) is connected to the connecting portion (5) and corresponds to the outer circumferential surface of the pressure cover (3). The rotary blade portion (6) is located at the extension of the other end of the twisting portion (7) and is inclined.

4. A blade assembly for a ducted fan according to claim 1, 2 or 3, characterized in that: The thickness of the rotating blade portion (6) gradually decreases from the middle toward both sides thereof to form a cutting edge (8).

5. A blade assembly for a ducted fan according to claim 1, 2 or 3, characterized in that: The connecting portion (5) is fixedly connected to the rotating blade portion (6) via the torsion portion (7) and is integrally formed after being covered with carbon fiber composite material.

6. A blade assembly for a ducted fan according to claim 1, 2 or 3, characterized in that: The outer rotor motor (1) comprises a stator (9) and a rotor mounting shell (10), wherein one end of the stator (9) is provided with a housing (11), and the rotor mounting shell (10) is located at the other end of the stator (9). A rotating shaft (12) is provided at the center of the stator (9), one end of the rotating shaft (12) is rotatably connected to the stator (9), and the other end of the rotating shaft (12) is detachably fixedly connected to the center of the rotor mounting shell (10), one side edge of the rotor mounting shell (10) is detachably fixedly connected to the housing (11), and the fan blade (4) is detachably mounted on the other side corresponding to the rotor mounting shell (10) through a pressure cover (3).

7. The blade assembly for a ducted fan according to claim 6, wherein: The rotor mounting shell (10) includes a circular shell (13) and a circular rotor body (14), wherein the rotor body (14) is located in the shell (13), the center of the rotor body (14) is fixedly connected to the rotating shaft (12), a plurality of guide vanes (15) uniformly distributed along the circumference of the rotor body (14) are provided on the circumferential surface of the rotor body (14), and the rotor body (14) is fixedly connected to the inner side wall of the shell (13) through the guide vanes (15), one side of the rotor body (14) is close to the stator (9), and the other side of the rotor body (14) is away from the stator (9), the fan blade (4) is detachably mounted on the side of the rotor body (14) away from the stator (9) through the pressure cover (3) and is located outside the shell (13), one end of the shell (13) is detachably fixedly connected to the outer shell (11), and the guide vane (15) is located in the other end of the shell (13).

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