Contra-rotating ducted fan power device

Abstract

The utility model provides a contra-rotating ducted fan power device which comprises a ducted shell, a center body, a rotating mechanism, a supporting mechanism and a driving mechanism, the center body, the rotating mechanism, the supporting mechanism and the driving mechanism are arranged in the ducted shell, a ducted inner space is formed in the ducted shell, and the center body is arranged in the center of the ducted inner space. The rotating mechanism, the supporting mechanism and the driving mechanism are all connected to the center body, the supporting mechanism is connected to the middle position of the center body, the driving mechanism is in transmission connection with the rotating mechanism, and the rotating mechanism comprises a first rotating mechanism body and a second rotating mechanism body; according to the contra-rotating ducted fan power device, the rotating directions of the two rotating mechanisms are opposite, the contra-rotating rotating mode can balance torque generated by rotating blades, vibration is reduced, the stability of a system is improved, the service life of the system is prolonged, meanwhile, the contra-rotating blades neutralize the eddy current effect, tail flow kinetic energy loss is reduced, and the service life of the system is prolonged. Therefore, higher thrust efficiency is realized.

Description

Technical Field

[0001] This utility model relates to the field of low-altitude aircraft technology, specifically to a power unit for vertical take-off and landing aircraft. Background Technology

[0002] As is well known, with the rapid development of my country's economy and the resulting growth in economic benefits across various industries, the development trend of the low-altitude economy is becoming increasingly strong. Many regions in my country have successively issued policies to support the development of the low-altitude economy, while also researching and releasing application scenarios for it. Among the numerous application scenarios of the low-altitude economy, the technology of low-altitude aircraft is also advancing rapidly. Ducted fan electric propulsion systems are a core component of eVOTAL (vertical takeoff and landing) aircraft, used for both cruise propulsion and vertical takeoff and landing. Due to their compact structure, low aerodynamic noise, and good safety, ducted fan electric propulsion systems represent a technological trend in low-altitude aircraft propulsion as a thrust or lift device. In existing ducted fans, the propeller blades installed inside the duct suffer significant kinetic energy loss due to the wake kinetic energy, resulting in low thrust efficiency. Specifically, if two sets of propeller blades are installed and rotate in the same direction, the resulting vibration is also significant, which reduces system stability and overall structural reliability. Therefore, a power unit for vertical takeoff and landing aircraft is needed that can improve thrust efficiency, balance the torque generated by the rotating blades during rotation, reduce wake kinetic energy loss, and provide high system stability and reliability. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a counter-rotating ducted fan power unit that can improve thrust efficiency, system stability and reliability.

[0004] To achieve the purpose of this utility model, this utility model provides a counter-rotating ducted fan power device, including a duct housing and a central body, a rotating mechanism, a supporting mechanism, and a driving mechanism disposed within the duct housing. An inner space is formed within the duct housing, and the central body is located at the center of the inner space. The rotating mechanism, supporting mechanism, and driving mechanism are all connected to the central body. The supporting mechanism is connected to the middle of the central body. The driving mechanism is drively connected to the rotating mechanism. The rotating mechanism includes a first rotating mechanism and a second rotating mechanism. The driving mechanism includes a first driving connection mechanism and a second driving connection mechanism. After the first rotating mechanism is connected to the first driving connection mechanism, it rotates in a first direction. After the second rotating mechanism is connected to the second driving connection mechanism, it rotates in a second direction. The supporting mechanism forms a support between the middle of the central body and the inner space of the duct and guides air towards the tail of the duct housing.

[0005] Preferably, the driving mechanism further includes a driving motor, one end of which is connected to the first rotating mechanism and the other end of which is connected to the second rotating mechanism. The first rotating mechanism includes a first rotating blade group and a connecting shaft. One end of the connecting shaft is rotatably connected to one end of the driving motor and the other end is connected to the first rotating blade group. The driving motor is built into the installation space formed inside the central body.

[0006] Preferably, the second rotating mechanism includes a second rotating blade group and a gear assembly. The gear assembly is provided with a rotating connecting shaft, a driving gear and a driven connecting gear. One end of the rotating connecting shaft is connected to the driving gear. The driving gear is connected to the driven gear through a pinion. The other end of the rotating connecting shaft is connected to the other end of the drive motor. Both the first rotating blade group and the second rotating blade group are made of carbon fiber blades.

[0007] Preferably, the adapter pinion is meshed with the drive gear, the driven connecting gear is meshed with the adapter pinion, and the driven gear is connected to the second rotating blade assembly via a connecting bearing.

[0008] Preferably, after the drive gear is connected to the other end of the drive motor, the drive gear rotates in the first direction under the drive of the drive motor, and at the same time, it meshes with the adapter pinion and drives the adapter pinion to rotate in the second direction. When the driven gear meshes with the adapter pinion, the adapter pinion drives the driven gear to rotate synchronously in the second direction. After the driven gear is rotatably connected to the second rotating blade group, the rotation direction of the second rotating blade group is opposite to the direction of the first rotating blade group.

[0009] Preferably, the central body comprises a first central body portion, a middle body portion, and a second central body portion. The first central body portion is located at the upper part of the central body, the middle body portion is located at the middle part of the central body, and the second central body portion is located at the lower part of the central body. The first central body portion, the middle body portion, and the second central body portion are sequentially connected to form the central body. The support mechanism is connected to the middle body portion. The middle body portion is provided with a connecting outer shell portion. An accommodating space is formed within the connecting outer shell portion for accommodating the unit gear assembly and the drive motor.

[0010] Preferably, a first rotating blade group is connected below the first central body portion, and a second rotating blade group is connected above the second central body portion. The first central body portion is a solid cone-shaped body, and the second central body portion is a solid inverted cone-shaped body. The length of the second central body portion is greater than the length of the first central body portion.

[0011] Preferably, the support mechanism includes a first support member and a second support member, which are connected vertically to the middle body. The duct shell is an outer duct shell, and the two ends of the first support member and the second support member are respectively connected to the connecting outer shell on the inner wall of the outer duct shell and the middle body.

[0012] Preferably, the support mechanism includes a support member, the two ends of which are respectively connected to the inner wall surface of the outer duct shell. The support member includes a support blade unit, which is a rectangular blade unit connected at an angle. Multiple support blade units are provided, and each support blade unit is connected to the middle body at intervals.

[0013] Preferably, a first inner lining layer is provided on the inner wall of the duct shell corresponding to the first central body portion, and a second inner lining layer is provided on the inner wall of the duct shell corresponding to the first central body portion. The first inner lining layer and the second inner lining layer are used to absorb the noise generated when the rotating blade assembly is in operation. Alternatively, the inner wall surface of the duct shell is provided with a complete inner lining layer.

[0014] The beneficial effects of this utility model are as follows: This utility model provides a counter-rotating ducted fan power device, which is provided with a central body, a rotating mechanism, a supporting mechanism, and a driving mechanism. The central body is located at the center of the duct space. The rotating mechanism, the supporting mechanism, and the driving mechanism are all connected to the central body. The supporting mechanism is connected to the middle of the central body and is used to form a support between the middle of the central body and the duct space and to guide the air towards the tail of the duct shell. The first rotating mechanism rotates in a first direction after being connected to the first driving connection mechanism, and the second rotating mechanism rotates in a second direction after being connected to the second driving connection mechanism. The two rotating mechanisms provided in this utility model rotate in opposite directions. The counter-rotating rotation can balance the torque generated by the rotating blades, reduce vibration, improve the stability and service life of the system, and at the same time, the counter-rotating blades neutralize the eddy current effect, reduce the loss of wake kinetic energy, and thus achieve higher thrust efficiency. Attached Figure Description

[0015] The above and other objects, features, and advantages of this invention will become clearer through a more detailed description of the preferred embodiments shown in the accompanying drawings. The same reference numerals indicate the same parts throughout the drawings, and the drawings are not intentionally drawn to scale with actual dimensions; the focus is on illustrating the gist of this invention.

[0016] Figure 1 This is a plan view of the ducted fan power unit of this utility model;

[0017] Figure 2 This is a split diagram of the ducted fan power unit of this utility model;

[0018] Figure 3 This is another schematic diagram of the reverse ducted fan power unit of this utility model;

[0019] Figure 4 This is a schematic cross-sectional view of a utility model of a rotating duct fan power device;

[0020] Figure 5 for Figure 4 A magnified schematic diagram of part of the structure.

[0021] In the figure: 1. Duct shell; 2. Central body; 3. Drive motor; 4. First rotating blade group; 5. Second rotating blade group; 51. Rotating connecting shaft; 52. Drive gear; 53. Driven connecting gear; 54. Adapter pinion; 6. First central body; 7. Middle body; 11. Support blade unit; 12. First inner liner; 13. Second inner liner. Detailed Implementation

[0022] To facilitate understanding of this utility model, a more comprehensive description will be given below with reference to the accompanying drawings.

[0023] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to and integrated with the other component, or there may be an intervening component present. The terms "mounted," "one end," "the other end," and similar expressions used in this document are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this applies. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] like Figure 1-5As shown, a preferred embodiment of this utility model provides a counter-rotating ducted fan power device, including a duct housing 1 and a central body 2, a rotating mechanism, a supporting mechanism, and a driving mechanism disposed within the duct housing 1. A duct inner space is formed within the duct housing. The central body 2 is located at the center of the duct inner space. The rotating mechanism, supporting mechanism, and driving mechanism are all connected to the central body 2. The supporting mechanism is connected to the middle of the central body 2. The driving mechanism is connected to the rotating mechanism via a transmission connection. The rotating mechanism includes a first rotating mechanism and a second rotating mechanism. The driving mechanism includes a first driving connection mechanism and a second driving connection mechanism. The two driving connection mechanisms can be connecting shafts located at both ends of a drive motor. After the first rotating mechanism is connected to the first driving connection mechanism, it rotates in a first direction. After the second rotating mechanism is connected to the second driving connection mechanism, it rotates in a second direction. The supporting mechanism forms a support between the middle of the central body and the duct inner space and guides air toward the tail of the duct housing.

[0026] refer to Figure 1-5 As shown, in the preferred embodiment, the drive mechanism further includes a drive motor 3. In this embodiment, in order to reduce the weight and structural complexity of the power device, the drive mechanism is set as a single-motor drive mechanism, but it can also be set as a dual-motor drive mechanism. In another more optimized dual-motor drive mechanism, when the single motor is driven, one end of the drive motor 3 is connected to the first rotating mechanism and the other end is connected to the second rotating mechanism. That is, a first drive connection mechanism is provided at one end of the drive motor 3 and a second drive connection mechanism is provided at the other end. In this embodiment, the two drive connection mechanisms are both power output extension shafts for extended connection with the power output shaft of the drive motor. The first rotating mechanism includes a first rotating blade group 4 and a connecting shaft. One end of the connecting shaft is rotatably connected to the drive connection mechanism at one end of the drive motor, and the other end is connected to the first rotating blade group 4. The drive motor 3 is built into the installation space formed inside the central body. Specifically, it is set on the central body 2 at the center position in the installation space.

[0027] refer to Figure 1-5As shown, in a preferred embodiment, the second rotating mechanism includes a second rotating blade group 5 and a gear assembly. The gear assembly is provided with a rotating connecting shaft 51, a driving gear 52, and a driven connecting gear 53. One end of the rotating connecting shaft 51 is connected to the driving gear. The driving gear 52 is connected to the driven connecting gear 53 via a pinion 54. The other end of the rotating connecting shaft 51 is connected to the other end of the drive motor 3, which is the second drive connection mechanism, and a power output extension shaft is connected to the other end of the drive motor 3. Both the first rotating blade group 4 and the second rotating blade group 5 are made of carbon fiber blades. Specifically, the following configuration is provided: Both sets of rotating blades are made of carbon fiber. This is to ensure that the rotating blades of the fan, that is, the rotor blades, have high torsional stiffness and strong blade consistency (blade consistency generally refers to the requirement that multiple blades in rotating machinery maintain a high degree of consistency in geometry, weight distribution, material properties, or dynamic performance. The importance of blade consistency is reflected in: reducing vibration and noise, ensuring uniform energy transfer, avoiding the overall efficiency decrease due to individual blade performance differences, such as in the power generation efficiency of wind turbines, and consistent dynamic characteristics can avoid local stress concentration, reduce the risk of blade breakage, and extend equipment life).

[0028] refer to Figure 1-5 As shown, in the preferred embodiment, the adapter pinion 54 meshes with the drive gear 52, and the driven connecting gear 53 meshes with the adapter pinion 54. The driven connecting gear 53 is connected to the second rotating blade group 5 via a connecting bearing 55. Specifically, the adapter pinion 54 meshes with the drive gear on the top and with the driven connecting gear 53 on the bottom. The rotation principle is equivalent to achieving coaxial reversal through a face gear set. The connection method is a gear combination connection. The drive gear 52 rotates under the drive of the motor power output extension shaft, which drives the adapter pinion to rotate. The rotation of the adapter pinion 54 is simultaneously transmitted to the driven connecting gear 53. A connecting bearing 55 is provided at the connection between the driven connecting gear 53 and the second rotating blade group 5 to stabilize the connection between the driven connecting gear 53 and the second rotating blade group 5. In this embodiment, the set unit gear assembly can not only transmit power but also change the rotation direction of the second rotating blade group 5.

[0029] refer to Figure 1-4As shown, in a further preferred embodiment, after the drive gear 52 is connected to the other end of the drive motor 3, the drive gear 52 rotates in the first direction under the drive of the drive motor 3. Simultaneously, it meshes perpendicularly with the adapter pinion 54, driving the adapter pinion to rotate in the second direction. While transmitting power to the driven gear, the adapter pinion 54 also changes the rotation direction of the driven gear. When the driven connecting gear 53 meshes perpendicularly with the adapter pinion 54, the adapter pinion 54 drives the driven connecting gear 53 to rotate synchronously in the second direction. The connection method for changing the rotation direction is that the adapter pinion 54 and the driven connecting gear... 53. The drive gear 52 is connected vertically. After the driven gear 53 is rotatably connected to the second rotating blade group 5, the rotation direction of the second rotating blade group 5 is opposite to that of the first rotating blade group 4. The two sets of rotating blade groups are set to rotate in opposite directions with the same speed. Since the blades rotating in opposite directions neutralize the eddy current effect, the loss of wake kinetic energy is reduced, thereby achieving higher thrust efficiency (one rotating blade group in one direction is equivalent to two efficiencies in doing work on the gas). The two sets of fan blades rotating in opposite directions can also balance the torque generated by the rotating blades, reduce vibration, and thus improve the stability and service life of the system.

[0030] refer to Figure 1-5 As shown, in a further preferred embodiment, the central body 2 comprises a first central body portion 6, a middle body 7, and a second central body portion 8. The first central body portion 6 is the upper part of the central body, the middle body is the middle part of the central body, and the second central body portion 8 is the lower part of the central body. The first central body portion 6, the middle body 7, and the second central body portion 8 are sequentially connected to form the central body. A support mechanism is connected to the middle body. A connecting outer shell 71 is provided on the middle body, and an accommodating space is formed within the connecting outer shell 71 to accommodate the unit gear assembly and drive motor. Arranging the several central body parts as integrally as possible is also to further simplify the structure of the central body, reduce the weight of the power unit, and reduce structural complexity.

[0031] refer to Figure 1-5 As shown, in a further preferred embodiment, the first rotating blade group 4 is connected below the first central body 6, and the second rotating blade group 5 is connected above the second central body 8. The first central body 6 is a solid cone-shaped body, and the second central body 8 is a solid inverted cone-shaped body. The length of the second central body 8 is greater than the length of the first central body. It has a compact structure, low aerodynamic noise, and good safety in use.

[0032] refer to Figure 1-5As shown, in a further preferred embodiment, the support mechanism includes a first support member 9 and a second support member 10. The first support member 9 and the second support member 10 are connected to the middle body in an upward and downward position. The duct shell is an outer duct shell. The two ends of the first support member 9 and the second support member 10 are respectively connected to the connecting outer shell on the inner wall of the outer duct shell and the middle body. The provided support members can strengthen the connection structure of the entire central body in the duct.

[0033] refer to Figure 1-5 As shown, in a further preferred embodiment, the support mechanism includes a support member, the two ends of which are respectively connected to the inner wall surface of the outer duct casing. The support member includes a support blade unit 11, which is a rectangular blade unit connected at an angle. Multiple support blade units 11 are provided, and each support blade unit is connected at intervals on the central body. The support blade units are connected to the central body and the duct casing. The support member can also be made without blades, but the flow loss will increase. Air is introduced from the front rotor, and the middle support member is set with a blade-shaped structure. The blades can quickly guide the air to the tail. When the rotor rotates, the air flows to the tail and flows in one direction.

[0034] refer to Figure 1-5 As shown, in a further preferred embodiment, a first inner lining layer 12 is provided on the inner wall of the duct shell corresponding to the first central body portion, and a second inner lining layer 13 is provided on the inner wall of the duct shell corresponding to the first central body portion. The first inner lining layer 12 and the second inner lining layer 13 are used to absorb the noise generated when the rotating blade assembly is running. Alternatively, a full inner lining layer is provided on the inner wall of the duct shell. The provided inner lining layer is an acoustic lining, which can effectively absorb the noise generated when the fan blades are running, especially high-frequency noise, and reduce the overall acoustic radiation of the system, thereby achieving quieter operation (the inner lining is mostly a cavity structure or a metamaterial structure, which ensures structural strength while making the structure lighter, smaller, and more lightweight).

[0035] The beneficial effects of this utility model are as follows: This utility model provides a counter-rotating ducted fan power device, which is provided with a central body, a rotating mechanism, a supporting mechanism, and a driving mechanism. The central body is located at the center of the duct space. The rotating mechanism, the supporting mechanism, and the driving mechanism are all connected to the central body. The supporting mechanism is connected to the middle of the central body and is used to form a support between the middle of the central body and the duct space and to guide the air towards the tail of the duct shell. The first rotating mechanism rotates in a first direction after being connected to the first driving connection mechanism, and the second rotating mechanism rotates in a second direction after being connected to the second driving connection mechanism. The two rotating mechanisms provided in this utility model rotate in opposite directions. The counter-rotating rotation mode can balance the torque generated by the rotating blades, reduce vibration, improve the stability and service life of the system, and at the same time, the counter-rotating blades neutralize the eddy current effect, reduce the loss of wake kinetic energy, and thus achieve higher thrust efficiency.

[0036] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this specification, the references to terms such as "preferred embodiment," "another embodiment," "other embodiment," or "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0038] The above embodiments only illustrate several implementation methods of the utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A power unit for a counter-rotating ducted fan, characterized in that: The device includes a duct shell and a central body, a rotating mechanism, a supporting mechanism, and a driving mechanism disposed within the duct shell. An internal space is formed within the duct shell. The central body is located at the center of the internal space. The rotating mechanism, supporting mechanism, and driving mechanism are all connected to the central body. The supporting mechanism is connected to the middle portion of the central body. The driving mechanism is drively connected to the rotating mechanism. The rotating mechanism includes a first rotating mechanism and a second rotating mechanism. The driving mechanism includes a first driving connection mechanism and a second driving connection mechanism. The first rotating mechanism rotates in a first direction after being connected to the first driving connection mechanism, and the second rotating mechanism rotates in a second direction after being connected to the second driving connection mechanism. The supporting mechanism provides support between the middle portion of the central body and the internal space of the duct, and guides air flow towards the rear of the duct shell.

2. The counter-rotating ducted fan power unit according to claim 1, characterized in that, The driving mechanism further includes a drive motor, one end of which is connected to the first rotating mechanism and the other end of which is connected to the second rotating mechanism. The first rotating mechanism includes a first rotating blade group and a connecting shaft. One end of the connecting shaft is rotatably connected to one end of the drive motor and the other end is connected to the first rotating blade group. The drive motor is built into the installation space formed inside the central body.

3. The counter-rotating ducted fan power unit according to claim 1, characterized in that, The second rotating mechanism includes a second rotating blade group and a gear assembly. The gear assembly is provided with a rotating connecting shaft, a driving gear and a driven connecting gear. One end of the rotating connecting shaft is connected to the driving gear. The driving gear is connected to the driven gear through a pinion. The other end of the rotating connecting shaft is connected to the other end of the drive motor. Both the first rotating blade group and the second rotating blade group are made of carbon fiber blades.

4. The counter-rotating ducted fan power unit according to claim 3, characterized in that, The adapter pinion meshes with the drive gear, the driven connecting gear meshes with the adapter pinion, and the driven gear is connected to the second rotating blade assembly via a connecting bearing.

5. The counter-rotating ducted fan power unit according to claim 3, characterized in that, After the drive gear is connected to the other end of the drive motor, the drive gear rotates in the first direction under the drive of the drive motor. At the same time, it meshes with the adapter pinion and drives the adapter pinion to rotate in the second direction. When the driven gear meshes with the adapter pinion, the adapter pinion drives the driven gear to rotate synchronously in the second direction. After the driven gear is rotatably connected to the second rotating blade group, the rotation direction of the second rotating blade group is opposite to the direction of the first rotating blade group.

6. The counter-rotating ducted fan power unit according to claim 1, characterized in that, The central body comprises a first central body section, a middle body section, and a second central body section. The first central body section is located at the upper part of the central body, the middle body section is located at the middle part of the central body, and the second central body section is located at the lower part of the central body. The first central body section, the middle body section, and the second central body section are sequentially connected to form the central body. The support mechanism is connected to the middle body. The middle body is provided with a connecting outer shell. An accommodating space is formed within the connecting outer shell for accommodating the unit gear assembly and the drive motor.

7. The counter-rotating ducted fan power unit according to claim 6, characterized in that, The first central body is connected to a first rotating blade group below, and the second central body is connected to a second rotating blade group above. The first central body is a solid cone-shaped body, and the second central body is a solid inverted cone-shaped body. The length of the second central body is greater than the length of the first central body.

8. The counter-rotating ducted fan power unit according to claim 1, characterized in that, The support mechanism includes a first support member and a second support member, which are connected to the middle body in an upward and downward orientation. The duct shell is an outer duct shell, and the two ends of the first support member and the second support member are respectively connected to the connecting outer shell on the inner wall of the outer duct shell and the middle body.

9. The counter-rotating ducted fan power unit according to claim 1, characterized in that, The support mechanism includes a support member, the two ends of which are respectively connected to the inner wall surface of the outer duct shell. The support member includes a support blade unit, which is a rectangular blade unit connected at an angle. There are multiple support blade units, and each support blade unit is connected to the middle body at intervals.

10. The counter-rotating ducted fan power unit according to claim 1, characterized in that, The duct shell has a first inner lining layer at the inner wall of the duct shell corresponding to the first central body portion, and a second inner lining layer at the inner wall of the duct shell corresponding to the first central body portion. The first and second inner lining layers are used to absorb the noise generated when the rotating blade assembly is in operation, or the inner wall of the duct shell is provided with a complete inner lining layer.

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