CN107521708B - Retractable air inlet channel mechanism - Google Patents
Retractable air inlet channel mechanism Download PDFInfo
- Publication number
- CN107521708B CN107521708B CN201710697023.6A CN201710697023A CN107521708B CN 107521708 B CN107521708 B CN 107521708B CN 201710697023 A CN201710697023 A CN 201710697023A CN 107521708 B CN107521708 B CN 107521708B
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- sliding
- air inlet
- inlet channel
- scissor
- ball screw
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- 230000007246 mechanism Effects 0.000 title claims abstract description 69
- 230000007704 transition Effects 0.000 claims abstract description 16
- 238000010008 shearing Methods 0.000 claims description 29
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims 1
- 230000033001 locomotion Effects 0.000 abstract description 8
- 230000003028 elevating effect Effects 0.000 abstract description 3
- 238000010030 laminating Methods 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000002356 single layer Substances 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D33/00—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for
- B64D33/02—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for of combustion air intakes
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Aviation & Aerospace Engineering (AREA)
- Ship Loading And Unloading (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
The invention discloses a retractable air inlet mechanism, and relates to the field of aircrafts. The air inlet channel adopts an S-shaped curve structure, is in smooth transition design with the machine body, is attached to the machine body to the greatest extent, and is in smooth transition between each cross section of the inlet of the air inlet channel and the air inlet of the engine. The lifting mechanism adopts a scissor type mechanism, the motor drives the ball screw to rotate, the ball screw drives the sliding shaft through threaded connection, so that the ball screw horizontally moves in a sliding groove on the sliding hinged support, the scissor type mechanism converts the horizontal movement into relative rotation between the fixed scissor rod and the sliding scissor rod, and lifting movement of the air inlet channel in the vertical direction is realized. The air inlet channel structure can be applied to the unmanned aerial vehicle, and when the unmanned aerial vehicle is in a transportation state, the air inlet channel is retracted in the machine body; when unmanned aerial vehicle is in operating condition, the intake duct rises to laminating with the fuselage through elevating system is parallel, and the engine starts, begins normal work.
Description
Technical Field
The invention relates to the field of aircrafts, in particular to a retractable air inlet channel mechanism of an unmanned aerial vehicle.
Background
Unmanned aerial vehicles play an increasingly important role, the medium and small unmanned aerial vehicles have limited loading capacity, limited speed and range, and often cannot execute remote tasks; in order to effectively exert the advantage of small-size unmanned aerial vehicle, utilize guided missile or large-scale conveyer etc. to carry out long-range throwing, on the one hand make up the disadvantage that small-size unmanned aerial vehicle navigation journey is not enough, on the other hand utilize guided missile or conveyer's sudden and prevent ability effectively to transport unmanned aerial vehicle cluster to enemy area, reduce by the discovery and hit down probability greatly. In order to improve the transportation efficiency of the remote throwing process, the space occupied by the unmanned aerial vehicle in the transportation process is reduced by carrying out folding and unfolding design on the wing tail fin and the air inlet channel of the single unmanned aerial vehicle. The current prior art about unmanned aerial vehicle wing retraction devices is quite large, such as patent application nos. 201410303976.6 and 201610137072.X, but no air inlet retraction device exists, so that it is necessary to provide a retractable air inlet mechanism.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and realizes lifting operation of an air inlet channel by designing a retractable air inlet channel mechanism.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the retractable air inlet channel mechanism comprises a scissor mechanism base, a sliding hinged support, a lifting slide block, a slide rod, a fixed scissor rod, a sliding scissor rod, a motor, a ball screw, a push-lifting platform, a hoop, a transition baffle, an air inlet channel, a limiting hole and a sliding shaft; the fixed fork rod and the sliding fork rod are hinged to form a fork mechanism, a lifting platform is fixed at the top of the fork mechanism, and the lifting platform is connected with the air inlet channel through a hoop and transmits force; the air inlet is of an S-shaped curve structure, one end of the transition baffle with a smooth surface is fixedly connected with the air inlet at the inlet of the air inlet, and when the air inlet is ejected, the other end of the transition baffle is lapped on the machine body, so that smooth transition with the machine body is realized; the base of the shearing fork mechanism is fixedly connected with a sliding hinged support and a vertical sliding rod, the sliding hinged support is provided with a horizontal sliding groove, the tail end of the fixed shearing fork rod is hinged with the sliding hinged support, the tail end of the sliding shearing fork rod is penetrated with a sliding shaft, and the sliding shaft penetrates through the sliding groove; the sliding shaft is provided with a threaded hole, one end of the ball screw is connected with the motor and driven by the motor, and the other end of the ball screw penetrates through the limiting hole and then is connected with the threaded hole, so that the sliding shaft is driven to horizontally slide in the sliding groove, and the lifting of the scissor mechanism is realized; the lifting slide block and the slide bar form a moving pair, and the lifting slide block is fixedly connected with the pushing platform so that the lifting slide block and the pushing platform are synchronously displaced in the vertical direction.
Preferably, the two shearing fork mechanisms and the sliding hinge support are symmetrically distributed on two sides of the ball screw, and the tail ends of the sliding shearing fork rods at the bottoms of the two shearing fork mechanisms synchronously move under the drive of the same sliding shaft.
Preferably, the hoop is hooped around the air inlet channel, and the lower part of the hoop is connected with the lifting platform in a hinged mode for transmission.
Preferably, the sliding hinged support and the base are fixed by at least two groups of bolts.
Preferably, the limiting hole is fixed on the base of the scissor mechanism and used for ensuring that the ball screw is always positioned at the axis of the motor.
Preferably, the top of the shearing fork mechanism is also connected with the pushing platform through a sliding hinged support with a sliding chute.
The retractable air inlet channel mechanism provided by the invention adopts a scissor fork type lifting mechanism, is driven by a motor, has controllable process, and solves the problem that wing retraction and air inlet channel interference can occur. When the unmanned aerial vehicle is in a transportation state, the retractable air inlet channel provided by the invention is retracted in the engine body; when unmanned aerial vehicle is in operating condition, the intake duct rises to laminating with the fuselage through elevating system is parallel, and the engine starts, begins normal work. Through the design, the transportation capacity of the unmanned aerial vehicle cluster can be effectively improved.
Drawings
FIG. 1 is a schematic view of an air intake mechanism (retracted state);
FIG. 2 is a right side view of the air intake mechanism (retracted state);
FIG. 3 is a schematic view of the scissor mechanism in an extended state;
FIG. 4 is a schematic diagram of an inlet pop-up condition;
FIG. 5 is a schematic view of the intake duct in a retracted state;
fig. 6 is a diagram of the geometry of a single layer scissor mechanism.
In the figure: the shearing fork mechanism comprises a shearing fork mechanism base 1, a sliding hinged support 2, a lifting sliding block 3, a sliding rod 4, a fixed shearing fork rod 5, a sliding shearing fork rod 6, a motor 7, a ball screw 8, a push-lifting platform 9, a hoop 10, a transition baffle 11, an air inlet channel 12, a limiting hole 13 and a sliding shaft 14.
Detailed Description
The invention is further illustrated and described below with reference to the drawings and examples. The technical features of the embodiments of the invention can be combined correspondingly on the premise of no mutual conflict.
As shown in fig. 1 to 3, the retractable air inlet channel mechanism comprises a scissor mechanism base 1, a sliding hinged support 2, a lifting sliding block 3, a sliding rod 4, a fixed scissor rod 5, a sliding scissor rod 6, a motor 7, a ball screw 8, a lifting platform 9, a hoop 10, a transition baffle 11, an air inlet channel 12, a limiting hole 13 and a sliding shaft 14.
The air inlet 12 adopts an S-shaped curve structure, the air inlet mechanism is divided into a retraction state and a ejection state, and the state conversion is switched by a scissors mechanism.
The shearing fork mechanism is formed by hinging 3 groups of fixed shearing fork rods 5 and sliding shearing fork rods 6, and the two groups are two in total and synchronously lifted to improve the overall stability.
The top of the scissor mechanism is connected with the lifting platform 9 through a sliding hinged support 2 with a sliding chute, a hoop 10 is tightly hooped on the periphery of an air inlet channel 12, and the lower end part of the hoop is connected with the lifting platform 9 in a hinged mode for transmission. The air inlet channel 12 is pushed by the pushing platform 9 to realize up-and-down lifting. The air inlet 12 is covered with a transition baffle 11 with a smooth surface, and when the air inlet pops up, the baffle can realize smooth transition with the airframe, so that excessive differential pressure resistance is avoided. One end of the transition baffle 11 is fixedly connected with the air inlet 12 at the inlet of the air inlet, the other end extends towards the machine body with a downward gradient, and when the air inlet 12 is popped up, the other end of the transition baffle 11 is lapped on the machine body. The air inlet channel structure can be smoothly transited with the machine body in a pop-up state, is attached to the machine body to the greatest extent, and is smoothly transited from each cross section between the inlet of the air inlet channel 12 to the air inlet of the engine, and each cross section area of the vertical center line is continuously changed, so that the radar scattering intensity of the air inlet channel is effectively reduced.
The shearing fork mechanism base 1 is used as a supporting component of the whole mechanism, two sliding hinged supports 2 and two vertical sliding rods 4 are fixedly connected on the shearing fork mechanism base through a plurality of groups of bolts, a horizontal sliding groove is formed in the sliding hinged support 2, the tail end of a fixed shearing fork rod 5 is hinged with the sliding hinged support 2, a sliding shaft 14 penetrates through the tail end of a sliding shearing fork rod 6, and two ends of the sliding shaft 14 are respectively positioned in the sliding grooves on the sliding hinged supports 2 on two sides. The sliding shaft 14 is provided with a threaded hole, and the limiting hole 13 is fixed on the base 1 of the scissor mechanism and used for ensuring that the ball screw 8 is always positioned at the axis position of the motor 7. The ball screw 8 is positioned between the two sliding hinge supports 2, one end of the ball screw 8 is connected with the motor 7 and driven by the motor 7, and the other end of the ball screw 8 passes through the limiting hole 13 and then is matched and connected with the threaded hole. The rotation of the motor can drive the ball screw 8 to rotate, and then drive the sliding shaft 14 to horizontally slide in the sliding groove, so that the lifting of the scissor mechanism is realized. The lifting slide block 3 and the slide bar 4 form a moving pair, and the lifting slide block 3 and the lifting platform 9 are fixedly connected through bolts or through a sleeve rod coaxially nested with the slide bar 4, so that the two are synchronously displaced in the vertical direction. The lifting slide block 3 ensures that the vertical movement of the scissor mechanism is on the same straight line.
As shown in fig. 1 and fig. 2, in the retracted state, the motor 7 drives the ball screw 8 to rotate, the ball screw 8 drives the sliding shaft 14 through threaded connection, so that the ball screw 8 horizontally moves in the sliding groove on the sliding hinged support 2, the shearing fork mechanism converts the horizontal movement into relative rotation between the fixed shearing fork 5 and the sliding shearing fork 6, the rotation pushes the lifting platform 9 upwards, and the lifting slide block 3 is driven to synchronously move upwards, finally, the lifting platform 9 pushes the hoop 10 through the hinging device, lifting movement of the air inlet channel 12 in the vertical direction is realized, and the extending state of the shearing fork mechanism is shown in fig. 3.
Fig. 4 is a three-dimensional schematic diagram of the retracted state, after the motor performs work and the scissor mechanism drives, the air inlet channel moves upwards integrally, exposes the machine body, and shows a pop-up state, as shown in fig. 5.
In this embodiment, a three-layer scissor-fork mechanism is preferably adopted, and a single-layer scissor-fork mechanism is taken as an example to describe the operation mechanism of the mechanism. As shown in fig. 6, l is the arm length of the scissor arm, a is the distance between the first hinge point and the last hinge point, and α is the acute angle between the scissor arm and the horizontal direction. The value of the mechanism l is 48.5mm, and the change range of the included angle alpha in the movement process of the mechanism is as follows: alpha is more than or equal to 20.5 degrees and less than or equal to 60 degrees. When alpha=20.5 degrees, the mechanism is reduced to the lowest in the vertical direction, when alpha=60 degrees, the mechanism is lifted to the highest position in the vertical direction, so that lifting motion in the vertical direction is realized, and the maximum vertical distance of lifting can be obtained from the geometric relationship:
Δh＝h1-h2＝lsinα1-lsinα2
Where l=48.5 mm, α 1＝60°,α2 =20.5°, and thus the lifting height of the one-layer scissor mechanism is 25mm, the lifting height of the three-layer mechanism is 3 Δh=75 mm.
The horizontal displacement during the movement of the mechanism can be obtained by the following relation:
Δa= lcos α 2-lcosα1 =21.18 mm, and the ratio of the horizontal displacement to the vertical displacement of the three-layer scissor mechanism is 1:3.54.
Of course, the above transmission parameters can be modified as desired by a person skilled in the art.
The air inlet channel structure can be applied to the unmanned aerial vehicle, and when the unmanned aerial vehicle is in a transportation state, the air inlet channel is retracted in the machine body; when unmanned aerial vehicle is in operating condition, the intake duct rises to laminating with the fuselage through elevating system is parallel, and the engine starts, begins normal work.
The above embodiment is only a preferred embodiment of the present invention, but it is not intended to limit the present invention, and all embodiments obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.
Claims (6)
1. The retractable air inlet channel mechanism is characterized by comprising a scissor mechanism base (1), a sliding hinged support (2), a lifting sliding block (3), a sliding rod (4), a fixed scissor rod (5), a sliding scissor rod (6), a motor (7), a ball screw (8), a pushing platform (9), a hoop (10), a transition baffle (11), an air inlet channel (12), a limiting hole (13) and a sliding shaft (14); a shearing fork mechanism is formed by hinging the fixed shearing fork rod (5) and the sliding shearing fork rod (6), a pushing platform (9) is fixed at the top of the shearing fork mechanism, and the pushing platform (9) is connected with the air inlet channel (12) through a hoop (10) and transmits force; the air inlet channel (12) adopts an S-shaped curve structure, one end of the transition baffle (11) with a smooth surface is fixedly connected with the air inlet channel (12) at the inlet of the air inlet channel, and when the air inlet channel (12) is ejected, the other end of the transition baffle (11) is lapped on the machine body to realize smooth transition with the machine body; the shearing fork mechanism base (1) is fixedly connected with a sliding hinged support (2) and a vertical sliding rod (4), the sliding hinged support (2) is provided with a horizontal sliding groove, the tail end of a fixed shearing fork rod (5) is hinged with the sliding hinged support (2), the tail end of a sliding shearing fork rod (6) is penetrated with a sliding shaft (14), and the sliding shaft (14) penetrates through the sliding groove; a threaded hole is formed in the sliding shaft (14), one end of the ball screw (8) is connected with the motor (7) and driven by the motor, and the other end of the ball screw passes through the limiting hole (13) and then is connected with the threaded hole, so that the sliding shaft (14) is driven to horizontally slide in the sliding groove to realize lifting of the scissor mechanism; the lifting slide block (3) and the slide bar (4) form a moving pair, and the lifting slide block (3) is fixedly connected with the pushing platform (9) so as to enable the two to be synchronous in displacement in the vertical direction.
2. The retractable air inlet mechanism according to claim 1, wherein the two scissor mechanisms and the sliding hinge support (2) are symmetrically distributed on two sides of the ball screw (8), and the tail ends of the sliding scissor rods (6) at the bottoms of the two scissor mechanisms synchronously move under the drive of the same sliding shaft (14).
3. The retractable air inlet mechanism according to claim 1, wherein the hoop (10) is tightly hooped on the periphery of the air inlet (12), and the lower part of the hoop is connected with the lifting platform (9) in a hinged manner for transmission.
4. A retractable air intake mechanism according to claim 1, wherein the sliding hinged support (2) is fixed to the base by at least two sets of bolts.
5. A retractable air intake mechanism according to claim 1, wherein the limiting hole (13) is fixed on the base (1) of the scissor mechanism, so as to ensure that the ball screw (8) is always positioned at the axis of the motor (7).
6. A retractable air intake mechanism according to claim 1, wherein the top of the scissor mechanism is also connected to the jack platform (9) by a sliding hinged support (2) with a chute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710697023.6A CN107521708B (en) | 2017-08-15 | 2017-08-15 | Retractable air inlet channel mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710697023.6A CN107521708B (en) | 2017-08-15 | 2017-08-15 | Retractable air inlet channel mechanism |
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| CN107521708A CN107521708A (en) | 2017-12-29 |
| CN107521708B true CN107521708B (en) | 2024-05-03 |
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| CN201710697023.6A Active CN107521708B (en) | 2017-08-15 | 2017-08-15 | Retractable air inlet channel mechanism |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107685868B (en) * | 2017-08-15 | 2023-12-12 | 浙江大学 | High subsonic stealth unmanned aerial vehicle |
| CN108284963B (en) * | 2018-03-28 | 2024-05-24 | 浙江华云清洁能源有限公司 | Unmanned aerial vehicle double lens mechanism and unmanned aerial vehicle |
| CN108263630B (en) * | 2018-03-28 | 2024-05-24 | 浙江华云清洁能源有限公司 | Unmanned aerial vehicle oblique photography cloud platform and unmanned aerial vehicle |
| CN109204848B (en) * | 2018-07-24 | 2022-03-22 | 中国商用飞机有限责任公司 | Telescopic auxiliary air inlet device |
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| CN106043716A (en) * | 2015-03-16 | 2016-10-26 | 波音公司 | Supersonic caret inlet system leading edge slat for improved inlet performance at off-design flight conditions |
| CN207242053U (en) * | 2017-08-15 | 2018-04-17 | 浙江大学 | One kind can folding and unfolding air intake duct mechanism |
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2017
- 2017-08-15 CN CN201710697023.6A patent/CN107521708B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10212963A (en) * | 1997-01-29 | 1998-08-11 | Yamaha Motor Co Ltd | Exhaust passage switching device of engine |
| US8371324B1 (en) * | 2009-06-19 | 2013-02-12 | The Boeing Company | Collapsible supersonic inlet centerbody |
| CN202071988U (en) * | 2011-03-15 | 2011-12-14 | 成都飞机设计研究所 | Expansible intake door for air vehicle |
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| CN107521708A (en) | 2017-12-29 |
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