Duct structure, duct fan, and aircraft

Abstract

To provide a duct structure, a duct fan, and an aircraft adaptable to requirements of the aircraft under different operating conditions to improve overall efficiency.SOLUTION: A telescopic air duct, a fixed air duct, and an air duct driving device, wherein the telescopic air duct is slidably connected to the fixed air duct, the fixed air duct is configured to be fixedly connected to an aircraft body, each air duct driving device is fixedly connected to the fixed air duct, each air duct driving device is connected to the telescopic air duct, and the air duct driving device is configured to drive the telescopic air duct to reciprocate along a direction of a center line of the telescopic air duct. The present invention further provides a ducted fan including a blade device and a duct structure. The blade device is installed in the duct cavity of the fixed duct. The present invention further provides an aircraft comprising an aircraft body and a duct structure. The fixed duct is fixedly connected to the aircraft body. The present invention can adapt to the requirements of the aircraft under different working conditions and improve the overall efficiency.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the technical field of flight devices, and more particularly to duct structures, ducted fans and aircraft. [Background technology]

[0002] A ducted fan is a new type of rotor structure used to provide lift and thrust for aircraft such as helicopters and drones. Ducted fans consist of a duct structure and rotors, with the rotors housed within a cylindrical duct structure. In recent years, the low-altitude economy has rapidly developed, resulting in a large number of flying cars on the market. Flying cars are a new type of transportation that can be used both on the ground and in the air. The duct structure is particularly important for ensuring the overall flight efficiency and rotor safety of flying cars. Compared to a single open rotor, ducted fans have higher overall aerodynamic efficiency and lower rotor noise due to their duct structure. Furthermore, the duct structure provides better rotor protection.

[0003] However, if a duct fan provides a large upward pulling force to achieve hovering, the duct length must be long enough, and the presence of the duct increases the frontal area of ​​the flying car when it is flying forward. If the duct is too long, the frontal area becomes too large during forward flight, increasing flight resistance and affecting overall efficiency. Existing duct structures are cylindrical and do not allow for adjustment of the duct length. For example, the duct fan provided in Patent Document 1 does not allow for adjustment of the duct length according to the flight state (hovering state or forward flight state), resulting in low overall flight efficiency. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Chinese Utility Model Patent No. 206943008 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention aims to solve the problems existing in the prior art as described above, and to provide a duct structure, ducted fan and aircraft that adapts to the requirements of the aircraft under different operating conditions and improves overall efficiency. [Means for solving the problem]

[0006] To achieve the above objectives, the present invention provides the following solutions:

[0007] The present invention provides a duct structure comprising a telescoping duct, a fixed duct, and at least one duct drive device, wherein the telescoping duct is slidably connected to the fixed duct, the fixed duct is arranged to be fixedly connected to an aircraft body, each of the duct drive devices is fixedly connected to the fixed duct, each of the duct drive devices is connected to the telescoping duct, and the duct drive devices are arranged to drive the telescoping duct to reciprocate along the center line direction of the telescoping duct.

[0008] Preferably, a mounting groove is provided at one end of the fixed duct, all of the duct drive devices are installed in the mounting groove, and the outer wall of the telescopic duct is arranged to slidably connect to the inner wall of the mounting groove.

[0009] Preferably, the telescopic duct comprises a duct body and at least one protrusion, each of the protrusions is fixedly connected to the duct body, each of the protrusions protrudes from the outer wall of the duct body, at least one sliding groove is provided on the inner wall of the mounting groove, each of the protrusions fits into one of the sliding grooves, and each of the protrusions is slidably connected to the corresponding sliding groove.

[0010] Preferably, each of the protrusions includes a first protrusion and a second protrusion, both ends of each of the first protrusions are fixedly connected to the duct body and one of the second protrusions, at least one end of each of the second protrusions protrudes from the outer wall of the corresponding one of the first protrusions, each of the slide grooves includes a first slide groove and a second slide groove that are connected to each other, each of the first slide grooves communicates with the mounting groove, each of the first protrusions fits into one of the slide grooves and each of the first protrusions is slidably connected to each of the corresponding one of the first slide grooves, each of the second protrusions fits into one of the second slide grooves and each of the second protrusions is slidably connected to each of the corresponding one of the second slide grooves.

[0011] Preferably, each said duct driver is a linear motor.

[0012] The present invention also provides a duct fan comprising a blade device and the duct structure, the blade device being installed in the duct cavity of the fixed duct.

[0013] Preferably, the turbine further includes a central body, the central body including a first central body and a second central body, the blade device including a blade drive device and a rotor blade assembly, the central body being at least partially installed within the duct cavity, the first central body being fixedly connected to the fixed duct, the second central body being rotatably connected to the first central body, the rotor blade assembly being fixedly connected to the second central body, the blade drive device being fixedly connected to the first central body, the blade drive device being connected to the second central body, and the blade drive device being arranged to drive the second central body to rotate around the centerline of the duct cavity.

[0014] The present invention further provides an aircraft, the aircraft comprising the aircraft body and the duct structure, wherein the fixed duct is fixedly connected to the aircraft body. [Effects of the Invention]

[0015] Compared with the prior art, the present invention achieves the following technical advantages: The present invention provides a duct structure, a ducted fan, and an aircraft. This embodiment provides a duct structure including a telescoping duct, a fixed duct, and at least one duct drive device. The telescoping duct is slidably connected to the fixed duct, and each duct drive device is connected to the telescoping duct, and the duct drive devices are arranged to drive the telescoping duct to move back and forth along the centerline of the telescoping duct. The telescoping duct is driven by the duct drive device to extend and retract along the centerline of the telescoping duct depending on the flight state of the aircraft, allowing the duct length to be changed to meet the requirements of the aircraft under different operating conditions. Specifically, when the aircraft is hovering, the duct drive device drives the telescoping duct to extend outward, increasing the length of the duct structure, preferably to its maximum length, allowing the ducted fan to normally lift the entire aircraft. When the aircraft is flying forward, the duct drive device drives the telescoping duct to retract inward, shortening the length of the duct structure, preferably to its minimum length, thereby reducing the frontal area of ​​the aircraft, thereby reducing overall resistance and improving overall efficiency. [Brief explanation of the drawings]

[0016] In order to more clearly describe the embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings that need to be used in the embodiments. Obviously, the drawings in the following description are only several embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative efforts.

[0017] [Figure 1] FIG. 1 is a structural schematic diagram of a duct structure provided by Example 1. [Figure 2] FIG. 1 is a structural schematic diagram of a fixed duct provided by Example 1. [Figure 3] FIG. 2 is a cross-sectional view of a mounting groove provided by Example 1. [Figure 4] FIG. 1 is a structural schematic diagram of a duct fan provided in Example 2. [Figure 5]FIG. 10 is a front view of a duct fan provided in accordance with a second embodiment. [Figure 6] FIG. 6 is a bottom view of FIG. 5. [Figure 7] FIG. 7 is a top view of FIG. [Figure 8] FIG. 10 is a structural schematic diagram of a duct fan provided in accordance with a second embodiment without a telescopic duct. [Figure 9] FIG. 9 is an enlarged view of A in FIG. 8. [Figure 10] FIG. 10 is a structural schematic diagram of a duct fan provided in Example 2 without a fixed duct. [Figure 11] FIG. 11 is an enlarged view of B in FIG. [Figure 12] FIG. 10 is a schematic diagram of the inward retraction of the expansion duct provided by Example 2. DETAILED DESCRIPTION OF THE INVENTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, any other embodiments obtained by those skilled in the art without any creative efforts fall within the scope of protection of the present invention.

[0019] The present invention aims to solve the problems existing in the prior art as described above, and to provide a duct structure, a ducted fan and an aircraft that can adapt to the requirements of the aircraft under different operating conditions and improve overall efficiency.

[0020] In order to make the above objects, features and advantages of the present invention more apparent and comprehensible, the present invention will be described in more detail below with reference to the drawings and detailed description of the invention.

[0021] Example 1 1 to 12, this embodiment provides a duct structure 100 including a telescopic duct 1, a fixed duct 2, and at least one duct drive device 3. The telescopic duct 1 is slidably connected to the fixed duct 2, which is arranged to be fixedly connected to the aircraft body, and each duct drive device 3 is fixedly connected to the fixed duct 2 and connected to the telescopic duct 1, and the duct drive devices 3 are arranged to drive the telescopic duct 1 to move back and forth along the center line of the telescopic duct 1. Depending on the flight state of the aircraft, the duct drive device 3 drives the telescopic duct 1 to extend and retract along the center line of the telescopic duct 1, allowing the length of the duct to be changed to meet the requirements of the aircraft under different operating conditions. Specifically, when the aircraft is in a hovering state, the duct drive device 3 drives the telescopic duct 1 to extend outward, increasing the length of the duct structure 100 preferably to its maximum length, allowing the duct fan 200 to normally lift the entire aircraft; when the aircraft is flying forward, the duct drive device 3 drives the telescopic duct 1 to retract inward, shortening the length of the duct structure 100 preferably to its minimum length, thereby reducing the frontal area of ​​the aircraft, thereby reducing overall resistance and improving overall efficiency.

[0022] In a preferred embodiment, the aircraft further comprises a controller that is connected to the duct drive device 3 by a signal; during hovering, the controller sends a duct outward extension signal to the duct drive device 3, which drives the telescopic duct 1 to extend outward; during forward flight, the controller sends a duct inward retraction signal to the duct drive device 3, which drives the duct drive device 3 to retract the telescopic duct 1 inward, thereby making it possible to freely change the length of the duct.

[0023] In this embodiment, a mounting groove 201 is installed at one end of the fixed duct 2, and all duct drive devices 3 are installed within the mounting groove 201, and the outer wall of the telescopic duct 1 is arranged to slidably connect to the inner wall of the mounting groove 201.

[0024] 8 to 11, in this embodiment, the telescopic duct 1 comprises a duct body and at least one protrusion, each protrusion is fixedly connected to the duct body and protrudes from the outer wall of the duct body, and at least one slide groove is provided on the inner wall of the mounting groove 201, each protrusion fits into one of the slide grooves and is slidably connected to a corresponding slide groove, which can restrict the circumferential movement of the corresponding protrusion along the fixed duct 2. The slidable fit between the protrusion and the slide groove allows the telescopic duct 1 to reciprocate more smoothly along the center line of the telescopic duct 1.

[0025] As shown in FIGS. 8 to 11, in this embodiment, each protrusion includes a first protrusion 4 and a second protrusion 5, both ends of each first protrusion 4 are fixedly connected to the duct body and one second protrusion 5, at least one end of each second protrusion 5 protrudes from the outer wall of the corresponding first protrusion 4, each slide groove includes a first slide groove 6 and a second slide groove 7 that are connected to each other, each first slide groove 6 is connected to the mounting groove 201, each first protrusion 4 fits into one first slide groove 6 and is slidably connected to the corresponding first slide groove 6, each second protrusion 5 fits into one second slide groove 7 and is slidably connected to the corresponding second slide groove 7. In a preferred embodiment, both the protrusions and slide grooves are T-shaped.

[0026] In this embodiment, each duct driver 3 is a linear motor, and the output end of the duct driver 3 is fixedly connected to the telescopic duct 1, and the other end of the duct driver 3 is fixedly connected to the fixed duct 2. There are preferably multiple duct drivers 3, and more preferably 30 duct drivers 3. The mounting groove 201 is an annular groove, and all the duct drivers 3 are uniformly installed along the circumferential direction of the annular groove.

[0027] Example 2 As shown in FIGS. 3 to 12, in this embodiment, a duct fan 200 is provided, which includes a blade device and the duct structure 100 of the first embodiment, and the blade device is installed in the duct cavity 202 of the fixed duct 2.

[0028] As shown in Figures 4 to 7, this embodiment further includes a central body, which includes a first central body 8 and a second central body 9, and the blade device includes a blade drive device and a rotor blade assembly, the central body is at least partially installed within the duct cavity 202, the first central body 8 is fixedly connected to the fixed duct 2, the second central body 9 is rotatably connected to the first central body 8, the rotor blade assembly is fixedly connected to the second central body 9, the blade drive device is fixedly connected to the first central body 8, the blade drive device is connected to the first central body 9, and the blade drive device is arranged to drive the second central body 9 to rotate around the center line of the duct cavity 202, thereby causing the rotor blade assembly to rotate around the center line of the duct cavity 202. The central body can provide a fixed support for the rotor blade assembly and the blade drive device, etc., and the blade drive device can drive the rotor blade assembly to rotate at high speed during the aircraft's flight, and the rotor blade assembly was the main power source of the duct fan 200.

[0029] In a preferred embodiment, the rotor blade assembly also includes at least one duct stator 10, both ends of which are fixedly connected to the outer wall of the first central body 8 and the inner wall of the fixed duct 2, respectively; the rotor blade assembly includes at least two rotor blades 11, one end of each rotor blade 11 being fixedly connected to the outer wall of the second central body 9 and the other end of each rotor blade 11 extending in a direction away from the second central body 9. There are multiple duct stators 10 and rotor blades 11, with multiple duct stators 10 arranged around the first central body 8 in the circumferential direction and multiple rotor blades 11 arranged around the second central body 9 in the circumferential direction.

[0030] Example 3 This embodiment provides an aircraft including an aircraft body and the duct structure 100 of embodiment 1. The fixed duct 2 is fixedly connected to the aircraft body.

[0031] The aircraft in this embodiment is preferably a flying car, but is not limited to this and may be other aircraft such as a drone.

[0032] The present invention uses specific examples to explain the principles and embodiments of the present invention, and the above description of the examples is only used to help understand the method and core idea of ​​the present invention, and at the same time, for those skilled in the art, there are changes in the form and application scope for implementing the invention according to the idea of ​​the present invention. In summary, the contents of this specification should not be understood as limiting the present invention. [Explanation of symbols]

[0033] 100 Duct structure 200 duct fan 1. Expansion duct 2 Fixed duct 201 Mounting groove 202 Duct cavity 3 Duct drive unit 4 1st protrusion 5 2nd protrusion 6 First slide groove 7 Second slide groove 8 First centrosome 9 Second centrosome 10 Duct Stator 11 Rotor blades

Claims

1. A duct structure including a telescopic duct, a fixed duct, and at least one duct drive device, wherein the telescopic duct is slidably connected to the fixed duct, the fixed duct is arranged to be fixedly connected to an aircraft body, each of the duct drive devices is fixedly connected to the fixed duct, and each of the duct drive devices is connected to the telescopic duct, and the duct drive device drives the telescopic duct to reciprocate along a center line direction of the telescopic duct, A mounting groove is provided at one end of the fixed duct, and all of the duct driving devices are installed in the mounting groove, and the outer wall of the telescopic duct is arranged to slidably connect to the inner wall of the mounting groove; The telescopic duct comprises a duct body and at least one protrusion, each of the protrusions is fixedly connected to the duct body, each of the protrusions protrudes from an outer wall of the duct body, and at least one sliding groove is provided on an inner wall of the mounting groove, each of the protrusions fits into one of the sliding grooves, and each of the protrusions is slidably connected to a corresponding one of the sliding grooves; each of the protrusions includes a first protrusion and a second protrusion, both ends of each of the first protrusions are fixedly connected to the duct body and one of the second protrusions, at least one end of each of the second protrusions protrudes from the outer wall of the corresponding one of the first protrusions, each of the slide grooves includes a first slide groove and a second slide groove that are connected to each other, each of the first slide grooves communicates with the mounting groove, each of the first protrusions fits into one of the slide grooves and is slidably connected to the corresponding one of the first slide grooves, each of the second protrusions fits into one of the second slide grooves and is slidably connected to the corresponding one of the second slide grooves.

2. 2. The duct structure according to claim 1, wherein each of the duct drivers is a linear motor.

3. A duct fan comprising a blade device and the duct structure according to any one of claims 1 to 2, wherein the blade device is installed within a duct cavity of the fixed duct.

4. 4. The duct fan of claim 3, further comprising a central body, the central body including a first central body and a second central body, the blade device comprising a blade drive device and a rotor blade assembly, the central body being at least partially disposed within the duct cavity, the first central body being fixedly connected to the stationary duct, the second central body being rotatably connected to the first central body, the rotor blade assembly being fixedly connected to the second central body, the blade drive device being fixedly connected to the first central body and the blade drive device being connected to the second central body, and the blade drive device being arranged to drive the second central body to rotate about a centerline of the duct cavity.

5. An aircraft comprising the aircraft body and the duct structure according to any one of claims 1 to 2, wherein the fixed duct is fixedly connected to the aircraft body.

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