Duct and unmanned aerial vehicle

Abstract

The invention relates to a duct and an unmanned aerial vehicle. The duct is applied to the unmanned aerial vehicle and comprises a shell, the shell is annular and defines a containing cavity, and an air inlet and an air outlet communicating with the outside are formed in the two ends of the containing cavity correspondingly; the mounting base is arranged close to the air outlet, the orthographic projection of the mounting base in the axial direction of the containing cavity falls in the containing cavity, the connecting pieces are connected between the shell and the mounting base, the connecting pieces are arranged in the circumferential direction of the shell at intervals, and the connecting pieces are arranged in the containing cavity. And the connecting piece is connected with the shell and the mounting seat through an integral forming process. And the connecting piece is connected with the shell and the mounting seat through an integral forming process. Therefore, on one hand, the connecting strength between the connecting piece and the shell and between the connecting piece and the mounting base can be improved, and the structural strength of the whole duct is improved. And on the other hand, the assembly process and manufacturing difficulty among the connecting piece, the shell and the mounting seat can be reduced, so that the manufacturing cost of the duct is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of unmanned aerial vehicles, in particular to a duct and an unmanned aerial vehicle. BACKGROUND

[0002] With the continuous progress of science and technology, unmanned aerial vehicles have made great progress in military and civilian fields. Unmanned aerial vehicles usually use free propellers to provide power, but free propellers produce a lot of noise and have low efficiency and safety. Improved unmanned aerial vehicles use a duct to surround the propeller, so that the noise of the propeller can be blocked to reduce the impact of noise, and the duct can block the impact and wind force on the propeller, thereby improving the safety and stability of the propeller, and the propeller can generate more thrust under the same input power. However, the traditional duct usually has the defects of low structural strength and high manufacturing cost. SUMMARY

[0003] One of the technical problems solved by the present application is how to reduce the manufacturing cost of the duct while ensuring the structural strength.

[0004] A duct applied to an unmanned aerial vehicle, the duct comprising:

[0005] a housing, the housing being annular and surrounding a receiving cavity, two ends of the receiving cavity forming an air inlet and an air outlet respectively, which communicate with the outside world;

[0006] a mounting seat, the mounting seat being arranged close to the air outlet, and an axial projection of the mounting seat along the receiving cavity falling within the receiving cavity; and

[0007] a plurality of connecting pieces, the plurality of connecting pieces being connected between the housing and the mounting seat, the plurality of connecting pieces being arranged at intervals along the circumference of the housing, and the connecting pieces being connected with the housing and the mounting seat by an integral molding process.

[0008] In one of the embodiments, from one end of the connecting piece connected with the mounting seat to the other end of the connecting piece connected with the housing, the distance of the connecting piece to the air inlet first increases or decreases.

[0009] In one of the embodiments, the mounting seat is annular, the mounting seat surrounds an open cavity with open ends, and a plurality of through holes are arranged on the mounting seat, the plurality of through holes penetrating the mounting seat along the axial direction of the mounting seat, and the plurality of through holes being arranged at intervals along the circumference of the mounting seat.

[0010] In one of the embodiments, the accommodating cavity comprises an air inlet section and an air outlet section which are coaxially arranged and in communication with each other, the air inlet section forms the air inlet at one end away from the air outlet section, and the air outlet section forms the air outlet at one end away from the air inlet section, and the diameter of the air inlet section increases from the end of the air inlet section close to the air outlet section.

[0011] In one of the embodiments, the diameter of the air outlet section remains constant along the axial direction of the accommodating cavity.

[0012] In one of the embodiments, the diameter of the air outlet section is less than or equal to the diameter of the air inlet section.

[0013] In one of the embodiments, the shell comprises an inner shell and an outer shell which are connected to each other, the inner shell forms the accommodating cavity, and the outer shell is sleeved on the inner shell.

[0014] In one of the embodiments, the outer surface of the outer shell is a side surface of a spherical platform, and the diameter of the outer surface of the outer shell decreases first and then increases from one end of the outer surface of the outer shell to the other end of the outer surface of the outer shell along the axial direction of the accommodating cavity.

[0015] In one of the embodiments, the mounting seat is at least partially located outside the accommodating cavity.

[0016] A UAV comprises a fuselage and the duct of any one of the above embodiments, and the mounting seat is connected to the fuselage.

[0017] One of the technical effects of one of the embodiments is that the connecting piece, the shell and the mounting seat are connected through an integral forming process. On the one hand, this can improve the connection strength between the connecting piece, the shell and the mounting seat, thereby improving the structural strength of the entire duct. On the other hand, this can reduce the assembly process and manufacturing difficulty between the connecting piece, the shell and the mounting seat, thereby reducing the manufacturing cost of the duct. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A perspective structural schematic view of the duct provided by one of the embodiments.

[0019] Figure 2 A Figure 1 A planar structural schematic view of the duct shown.

[0020] Figure 3 A Figure 1 A perspective structural schematic view of the duct shown from another perspective.

[0021] Figure 4 A Figure 1 An exploded structural schematic view of the duct shown.

[0022] Figure 5 AFigure 1 The diagram shows a planar cross-sectional view of the culvert.

[0023] Figure 6 for Figure 1 The diagram shows a three-dimensional sectional view of the duct.

[0024] Figure 7 A schematic diagram of the three-dimensional structure of the tooling, the first blank, and the second blank after assembly, provided in one embodiment.

[0025] Figure 8 for Figure 7 A schematic diagram of its decomposed structure.

[0026] Figure 9 for Figure 7 A schematic diagram of the three-dimensional structure from another perspective.

[0027] Figure 10 for Figure 7 A three-dimensional sectional view of the structure.

[0028] Figure 11 for Figure 7 A schematic diagram of the planar structure of the second blank.

[0029] Figure 12 for Figure 7 A perspective view of the structure when strips of composite material are wound around it.

[0030] Figure 13 A process flow diagram of a composite material structural component manufacturing process provided in one embodiment.

[0031] Reference numerals: duct 10, shell 100, accommodating cavity 110, air inlet section 111, air inlet 1111, air outlet section 112, air outlet 1121, inner shell 120, outer shell 130, outer surface 131, mounting base 200, open cavity 210, through hole 220, connector 300, tooling 400, cavity 410, side cylinder 420, base 430, first cavity 431, second cavity 432, stepped surface 433, reinforcing rib 440, groove 441, first blank 500, main body 510, protrusion 520, second blank 600, first mounting ring 610, inner circle 611, outer circle 612, second mounting ring 620, limiting surface 621, orthographic projection 622, winding column 630, strip composite material 800. Detailed Implementation

[0032] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described herein and by one of ordinary skill in the art without departing from the spirit and scope of the present application, and it is therefore intended that all such variations be considered as falling within the scope of the present application. It should be understood that the use of the terms "include", "comprise" or "contain" herein should not be understood as limiting the present application to the features or steps described herein, but rather the use of these terms is intended to cover the presence of the features or steps described herein as well as the presence of other features or steps not described herein.

[0033] In the description of the present application, it should be understood that, if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0034] In addition, if these terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features referred to. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "a plurality of" appears, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0035] In the present application, unless otherwise specifically defined and limited, if the terms "mount", "connect", "connect", "fix" and the like appear, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise specifically limited. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] In the present application, unless specifically defined and limited otherwise, if there is a description of a first feature on or above or below a second feature, it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature can be above or above and above the second feature, or it can only mean that the first feature is higher in horizontal height than the second feature. The first feature can be below or below and below the second feature, or it can only mean that the first feature is lower in horizontal height than the second feature.

[0037] It should be noted that if an element is referred to as being "fixed to" or "set to" another element, it can be directly on the other element or there can be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be an intermediate element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are only for the purpose of illustration and do not mean the only implementation.

[0038] Referring to Figure 1 , Figure 2 and Figure 3 , an embodiment of the present application provides a duct 10 applied to a UAV, the duct 10 can be a composite material structure, the duct 10 includes a shell 100, a mounting seat 200 and a connecting piece 300, the shell 100 is annular and surrounds a receiving cavity 110, two ends of the receiving cavity 110 form an air inlet 1111 and an air outlet 1121 respectively, the air inlet 1111 and the air outlet 1121 are both communicated with the outside. The mounting seat 200 is arranged close to the air outlet 1121, the orthographic projection of the mounting seat 200 along the axis of the receiving cavity 110 falls within the receiving cavity 110, for example, the mounting seat 200 and the shell 100 can be coaxially arranged. The mounting seat 200 can be mounted with a propeller, the propeller can be accommodated in the receiving cavity 110, when the propeller rotates, the gas enters the receiving cavity 110 from the air inlet 1111, and flows out of the receiving cavity 110 from the air outlet 1121, so as to provide driving force for the movement of the entire UAV. The number of the connecting pieces 300 is multiple, the connecting pieces 300 can be made of composite material with carbon fiber, the connecting pieces 300 are connected between the shell 100 and the mounting seat 200, that is, one end of the connecting pieces 300 is connected with the shell 100, the other end of the connecting pieces 300 is connected with the mounting seat 200, the multiple connecting pieces 300 are arranged in a circumferential direction of the shell 100, and the connecting pieces 300 are connected with the shell 100 and the mounting seat 200 through an integral molding process.

[0039] If the connecting piece 300 is physically connected with the shell 100 and the mounting base 200 through the intermediate connecting piece 300, for example, the connecting piece 300 is bolted or glued with the shell 100 and the mounting base 200, which will affect the connection strength between the connecting piece 300 and the shell 100 and the mounting base 200, and also make the assembly between the connecting piece 300 and the shell 100 and the mounting base 200 more complicated.

[0040] For the duct 10 in the above embodiment, the connecting piece 300 is connected with the shell 100 and the mounting base 200 through an integral molding process. On the one hand, this can improve the connection strength between the connecting piece 300 and the shell 100 and the mounting base 200, thereby improving the structural strength of the entire duct 10. On the other hand, it can reduce the assembly process and manufacturing difficulty between the connecting piece 300 and the shell 100 and the mounting base 200, thereby reducing the manufacturing cost of the duct 10.

[0041] Referring to Figure 4 , Figure 5 and Figure 6 , in some embodiments, the distance from the end of the connecting piece 300 connected with the mounting base 200 to the other end of the connecting piece 300 connected with the shell 100 to the air inlet 1111 first increases or decreases, so that the connecting piece 300 is roughly arc-shaped. Since there is a certain spacing between the shell 100 and the mounting base 200, when the shell 100 and the mounting base 200 are connected through the arc-shaped connecting piece 300, the connection strength between the connecting piece 300 and the shell 100 and the mounting base 200 can be improved to some extent, thereby further improving the structural strength of the entire duct 10.

[0042] Referring to Figure 4 , Figure 5 and Figure 6 , in some embodiments, the mounting base 200 can be annular, the mounting base 200 surrounds an open cavity 210 with open ends, and the mounting base 200 is provided with through holes 220, the number of the through holes 220 is multiple, and the through holes 220 penetrate the mounting base 200 along the axial direction of the mounting base 200, so that both ends of the through holes 220 are open, and the multiple through holes 220 are arranged in the circumferential direction of the mounting base 200. Obviously, the multiple through holes 220 will also be arranged around the open cavity 210. By arranging the through holes 220, the motor and the propeller and other components can be conveniently mounted on the mounting base 200 through the through holes 220.

[0043] Referring to Figure 4 , Figure 5 and Figure 6In some embodiments, the accommodating cavity 110 comprises an air inlet section 111 and an air outlet section 112, which are in communication with each other and can be coaxially arranged, the air inlet section 111 is formed with an air inlet 1111 at an end away from the air outlet section 112, and the air outlet section 112 is formed with an air outlet 1121 at an end away from the air inlet section 111. The caliber of the air inlet section 111 increases from an end close to the air outlet section 112 to the air inlet 1111, so that the air inlet section 111 is substantially in the shape of a horn. Since the gas enters the accommodating cavity 110 from the horn-shaped air inlet section 111, the air inlet resistance can be reduced to some extent, so that the air inlet amount is increased, and thus the conversion rate of the propeller to energy is reasonably improved.

[0044] In some embodiments, the caliber of the air outlet section 112 is less than or equal to that of the air inlet section 111, and the length of the air outlet section 112 can be greater than that of the air inlet section 111 along the axial direction of the accommodating cavity 110, so that the air outlet section 112 has a reasonable length, and the air inlet section 111 has a reasonable space for accommodating the propeller and other components such as the motor for driving the propeller to move. The caliber of the air outlet section 112 remains constant along the axial direction of the accommodating cavity 110, which can be understood as that the air outlet section 112 is substantially in the shape of a cylinder, so that the manufacturing difficulty of the air outlet section 112 can be reasonably reduced, thereby reducing the manufacturing cost of the mounting seat 200 and the entire duct 10.

[0045] Referring to Figure 4 , Figure 5 and Figure 6 In some embodiments, the shell 100 comprises an inner shell 120 and an outer shell 130, which are connected to each other, the inner shell 120 surrounds the accommodating cavity 110, and the outer shell 130 is sleeved on the inner shell 120. By connecting the separately arranged inner shell 120 and outer shell 130 to form the shell 100, the manufacturing difficulty of the shell 100 can be reduced to some extent, thereby reducing the manufacturing cost of the entire duct 10.

[0046] Referring to Figure 4 , Figure 5 and Figure 6 In some embodiments, the outer surface 131 of the outer shell 130 is in the shape of a side surface of a spherical platform, and the diameter of the outer surface 131 of the outer shell 130 decreases first and then increases from one end of the outer surface 131 of the outer shell 130 to the other end of the outer surface 131 of the outer shell 130 along the axial direction of the accommodating cavity 110. Since the outer surface 131 of the outer shell 130 is in the shape of a side surface of a spherical platform, which can be understood as that the outer surface 131 of the outer shell 130 is part of a spherical surface, the resistance generated between the outer surface 131 of the outer shell 130 and the air can be reduced during the flight of the unmanned aerial vehicle, thereby reducing the flight resistance of the entire unmanned aerial vehicle.

[0047] Referring to Figure 4 ,Figure 5 And Figure 6 In some embodiments, the mounting base 200 is at least partially located outside the accommodating cavity 110, for example, the entire mounting base 200 can also be located outside the accommodating cavity 110, since the mounting base 200 will serve as a bearing carrier for the motor and propeller, so as to reduce or eliminate the mounting base 200 to the accommodating cavity 110 of the occupation space, so that the accommodating cavity 110 can be left with enough space for accommodating other components such as the motor and the propeller.

[0048] The present application also provides a UAV, which comprises a fuselage and the above-mentioned duct 10, and the mounting base 200 is connected to the fuselage, so that the center of the entire duct 10 is connected to the fuselage. During the movement of the propeller, the vibration generated by the duct 10 relative to the fuselage can be reduced, thereby improving the stability of the duct 10 during the flight of the UAV, and further reducing the resistance generated by the UAV during the flight.

[0049] Referring to Figure 7 , Figure 8 , Figure 12 And Figure 13 The present application also provides a composite material structure manufacturing process, which can be used to manufacture the above-mentioned duct 10 as a representative of the composite material structure. The manufacturing process mainly comprises the following steps:

[0050] S710, the first blank 500 is sleeved on the tooling 400, and the second blank 600 is installed on the tooling 400, and the tooling 400 is provided with a cavity 410.

[0051] S720, one end of the strip-shaped composite material 800 is wound on the first blank 500 and the other end is wound on the second blank 600, and the strip-shaped composite material 800 is accommodated in the cavity 410.

[0052] S730, the strip-shaped composite material 800 is heated and solidified, the strip-shaped composite material 800 located in the cavity 410 is converted into the connecting piece 300, the first blank 500 wound with the strip-shaped composite material 800 is converted into the inner shell 120, and the second blank 600 wound with the strip-shaped composite material 800 is converted into the mounting base 200.

[0053] S740, the tooling 400 is unloaded from the inner shell 120, the mounting base 200 and the connecting piece 300.

[0054] In some embodiments, the strip-shaped composite material 800 can be a material with carbon fibers, so that the strip-shaped composite material 800 can be conveniently formed into the connecting piece 300 through a winding forming process, so that the connecting piece 300 is connected with the mounting seat 200 and the shell 100 through the winding forming process, so that the connection strength between the connecting piece 300 and the mounting seat 200 and the shell 100 can be improved, and the assembly process between the connecting piece 300 and the mounting seat 200 and the shell 100 is simplified, and finally the manufacturing cost of the composite structure of the duct 10 and the like is reduced on the basis of ensuring the structural strength.

[0055] Referring to Figure 7 , Figure 8 and Figure 9 , in some embodiments, the tooling 400 includes a side cylinder 420, a base 430, and a plurality of reinforcing ribs 440. The side cylinder 420 can be substantially cylindrical, and the base 430 can be coaxially arranged with the side cylinder 420, and the axial projection of the base 430 falls within the cavity surrounded by the side cylinder 420. The plurality of reinforcing ribs 440 are arranged in a circumferential direction of the side cylinder 420, and the reinforcing ribs 440 are connected between the base 430 and the side cylinder 420, that is, one end of the reinforcing rib 440 is connected with the base 430, and the other end of the reinforcing rib 440 is connected with the side cylinder 420. The reinforcing rib 440 is provided with a groove 441, and the groove 441 is configured as part of the cavity 410. The groove 441 is a blind groove, so that the groove 441 can accommodate the strip-shaped composite material 800 to better form the connecting piece 300 of the duct 10.

[0056] Referring to Figure 8 , Figure 9 and Figure 10 , in some embodiments, with the end of the cavity of the side cylinder 420 away from the base 430 as a reference end, the distance from the end of the groove 441 close to the base 430 to the reference end increases first and then decreases, so that the groove 441 is substantially arc-shaped. Therefore, after the strip-shaped composite material 800 in the groove 441 is cured to form the connecting piece 300, the shape of the connecting piece 300 is adapted to the shape of the groove 441, so that the connecting piece 300 after forming is also arc-shaped, so that the connection strength between the connecting piece 300 and the shell 100 and the mounting seat 200 can be improved, thereby improving the structural strength of the entire duct 10.

[0057] Referring to Figure 8 , Figure 9 and Figure 10In some embodiments, the base 430 is provided with a first cavity 431 and a second cavity 432, both of which are coaxially arranged, the first cavity 431 has a larger caliber than the second cavity 432, and the groove 441 penetrates the inner sidewall surface of the first cavity 431, so that the groove 441 and the first cavity 431 are in communication with each other. The first cavity 431 is also configured as part of the cavity 410, and it can be understood that the strip-shaped composite material 800 located in the groove 441 can extend into the first cavity 431 to be wound on the second blank 600. The base 430 is also provided with a stepped surface 433, which is located at the communication position of the first cavity 431 and the second cavity 432, and is arranged around the second cavity 432. It can be understood that the middle region of the bottom wall surface of the first cavity 431 is recessed to form the second cavity 432, and the edge region of the bottom wall surface of the first cavity 431 that is not recessed will form the stepped surface 433, so that the first cavity 431 and the second cavity 432 can jointly form a stepped hole. The second blank 600 is matched with the second cavity 432, so as to realize the assembly of the second blank 600 and the base 430.

[0058] Referring to Figure 8 , Figure 9 and Figure 10 In some embodiments, the second blank 600 includes a first mounting ring 610, a second mounting ring 620, and a winding column 630. Both of the first mounting ring 610 and the second mounting ring 620 have a cross-sectional dimension larger than that of the winding column 630. The first mounting ring 610 surrounds the open cavity 210, which is in communication with the first cavity 431 and the second cavity 432. Both of the second mounting ring 620 and the winding column 630 are in plurality, and the number of the second mounting ring 620 is equal to that of the winding column 630. The plurality of winding columns 630 are protrusively arranged on the first mounting ring 610 and are spaced apart along the circumferential direction of the first mounting ring 610, and the second mounting ring 620 is arranged at the end of the winding column 630 away from the first mounting ring 610, so that each winding column 630 is provided with one second mounting ring 620, and the first mounting ring 610 and the second mounting ring 620 are spaced apart along the axial direction of the second blank 600. The second mounting ring 620 is provided with a limiting surface 621 around the winding column 630. Specifically, the winding column 630 is connected to the middle region of the surface of the second mounting ring 620 facing the first mounting ring 610, so that the middle region is covered by the winding column 630, and the edge region of the surface of the second mounting ring 620 facing the first mounting ring 610 is not covered by the winding column 630 to form the limiting surface 621. The strip-shaped composite material 800 is wound on the winding column 630, and is located between the limiting surface 621 and the first mounting ring 610.

[0059] Since the strip-shaped composite material 800 is wound on the winding column 630 and filled between the limiting surface 621 and the first mounting ring 610, after the strip-shaped composite material 800 is cured and formed, the second blank 600 and the strip-shaped composite material 800 wound on the winding column 630 will be collectively transformed into the above-mentioned annular mounting seat 200. Obviously, the strip-shaped composite material 800 located in the groove 441 and the first cavity 431 will be cured to form the connecting piece 300 of the duct 10.

[0060] Referring to Figure 8 , Figure 9 and Figure 10 , in some embodiments, the surface of the first mounting ring 610 towards the second mounting ring 620 is flush with the step surface 433. In this way, the strip-shaped composite material 800 can smoothly enter the first cavity 431 and be wound on the winding column 630, and the strip-shaped composite material 800 can also be filled between the limiting surface 621 of the first mounting ring 610 and the second mounting ring 620, thereby ensuring effective formation of the mounting seat 200.

[0061] Referring to Figure 11 , in some embodiments, the orthographic projection 622 of the second mounting ring 620 on the first mounting ring 610 is circular, the orthographic projection 622 of the second mounting ring 620 is circumscribed with the inner circle 611 of the first mounting ring 610, and the orthographic projection 622 of the second mounting ring 620 is inscribed with the outer circle 612 of the first mounting ring 610. Therefore, when the strip-shaped composite material 800 is filled between the limiting surface 621 of the first mounting ring 610 and the second mounting ring 620, the second blank 600 wound with the strip-shaped composite material 800 can be smoothly transformed into the annular mounting seat 200, thereby facilitating effective formation of the mounting seat 200.

[0062] In some embodiments, before the strip-shaped composite material 800 is wound on the winding column 630, a through hole 220 is provided on the second blank 600, which penetrates the first mounting ring 610, the second mounting ring 620 and the winding column 630. Therefore, after the second blank 600 wound with the strip-shaped composite material 800 is transformed into the annular mounting seat 200, the through hole 220 is actually the through hole 220 of the mounting seat 200, and obviously, the open cavity 210 of the first mounting ring 610 is also actually the open cavity 210 of the mounting seat 200. Therefore, the through hole 220 is provided on the second blank 600 before the strip-shaped composite material 800 is wound, which can reduce the difficulty of forming the through hole 220, thereby reducing the manufacturing cost of the duct 10.

[0063] Referring to Figure 8 , Figure 9 and Figure 10In some embodiments, along the radial direction of the first mounting ring 610, the orthographic projection of the winding column 630 at least partially falls on the opening where the groove 441 communicates with the first cavity 431, in other words, so that the winding column 630 corresponds to the recess, the number of the winding column 630 and the groove 441 can be equal to form a one-to-one correspondence. Therefore, after the strip-shaped composite material 800 extends out of the groove 441, the strip-shaped composite material 800 can be extended along a straight line to the winding column 630, so that the strip-shaped composite material 800 is smoothly wound on the winding column 630, thereby reducing the winding difficulty of the strip-shaped composite material 800 on the second blank 600, thereby reducing the manufacturing cost of the duct 10.

[0064] Referring to Figure 8 , Figure 9 and Figure 10 In some embodiments, the first blank 500 includes a body portion 510 and a plurality of protrusions 520, the body portion 510 is sleeved on the tooling 400, and the protrusions 520 are protrudingly arranged on the body portion 510 and used for winding the strip-shaped composite material 800. The plurality of protrusions 520 are arranged at intervals along the circumferential direction of the body portion 510, one end of the protrusion 520 is a fixed end fixedly connected with the body portion 510, and the other end of the protrusion 520 is a free end arranged away from the body portion 510. Along the axial direction of the tooling 400, the free end of the protrusion 520 is farther away from the second blank 600 than the fixed end of the protrusion 520, and it can be understood that the protrusion 520 is arranged obliquely. Therefore, by arranging the protrusion 520 obliquely, when the strip-shaped composite material 800 is wound on the protrusion 520, the strip-shaped composite material 800 can be tightly attached to the body portion 510, and after the first blank 500 wound with the strip-shaped composite material 800 is transformed into the inner shell 120 of the duct 10, the connection strength between the connecting piece 300 and the inner shell 120 can be improved.

[0065] Referring to Figure 12 In some embodiments, the same strip-shaped composite material 800 wound on the winding column 630 of the second blank 600 can be wound with one or more protrusions 520, for example, Figure 12 The same strip-shaped composite material 800 can be wound with three protrusions 520. When the strip-shaped composite material 800 is wound with a plurality of protrusions 520 arranged adjacent to each other, the stress generated in the winding process of the strip-shaped composite material 800 can be effectively dispersed or even eliminated, thereby improving the connection strength between the connecting piece 300 and the inner shell 120 and the mounting seat 200.

[0066] The technical features of the above-described embodiments can be combined in any manner. In order to make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present disclosure.

[0067] The above-described embodiments are merely illustrative of several embodiments of the present application, which are described in more detail and in a more specific manner, but should not be construed as limiting the scope of the patent application. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A duct for use in unmanned aerial vehicles (UAVs), characterized in that, The duct includes: The housing is annular and forms a cavity, with an air inlet and an air outlet at both ends of the cavity respectively communicating with the outside. The mounting base is disposed near the air outlet, and the orthographic projection of the mounting base along the axial direction of the receiving cavity falls within the receiving cavity: and The connectors are multiple in number, and the multiple connectors are connected between the housing and the mounting base. The multiple connectors are spaced apart along the circumference of the housing, and the connectors are connected to the housing and the mounting base by an integral molding process.

2. The culvert according to claim 1, characterized in that, From the end of the connector connected to the mounting base to the other end of the connector connected to the housing, the distance from the connector to the air inlet first increases or decreases.

3. The culvert according to claim 1, characterized in that, The mounting base is annular, forming an open cavity with openings at both ends. The mounting base has multiple through holes that extend through the mounting base along its axial direction, and the multiple through holes are spaced apart along the circumference of the mounting base.

4. The culvert according to claim 1, characterized in that, The accommodating cavity includes an air inlet section and an air outlet section that are interconnected and coaxially arranged. The end of the air inlet section away from the air outlet section forms the air inlet, and the end of the air outlet section away from the air inlet section forms the air outlet. From the end of the air inlet section near the air outlet section to the air inlet, the diameter of the air inlet section increases.

5. The culvert according to claim 4, characterized in that, The diameter of the outlet section remains constant along the axial direction of the accommodating cavity.

6. The culvert according to claim 4, characterized in that, The diameter of the outlet section is less than or equal to the diameter of the inlet section.

7. The culvert according to claim 1, characterized in that, The housing includes an inner shell and an outer shell that are connected to each other. The inner shell surrounds the accommodating cavity, and the outer shell is fitted onto the inner shell.

8. The culvert according to claim 7, characterized in that, The outer surface of the housing is the side of the table tennis table. Along the axial direction of the accommodating cavity, from one end of the outer surface of the housing to the other end, the diameter of the outer surface of the housing first decreases and then increases.

9. The culvert according to claim 1, characterized in that, The mounting base is at least partially located outside the accommodating cavity.

10. A drone, characterized in that, It includes a fuselage and a duct as described in any one of claims 1 to 9, wherein the mounting base is connected to the fuselage.

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