CN114715376B - Maintenance flap suitable for flexible skin wing - Google Patents
Maintenance flap suitable for flexible skin wing Download PDFInfo
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- CN114715376B CN114715376B CN202210565866.1A CN202210565866A CN114715376B CN 114715376 B CN114715376 B CN 114715376B CN 202210565866 A CN202210565866 A CN 202210565866A CN 114715376 B CN114715376 B CN 114715376B
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- sheet
- cover
- rectangular
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- layer sheet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C1/00—Fuselages; Constructional features common to fuselages, wings, stabilising surfaces or the like
- B64C1/14—Windows; Doors; Hatch covers or access panels; Surrounding frame structures; Canopies; Windscreens accessories therefor, e.g. pressure sensors, water deflectors, hinges, seals, handles, latches, windscreen wipers
- B64C1/1407—Doors; surrounding frames
- B64C1/1446—Inspection hatches
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C3/00—Wings
- B64C3/26—Construction, shape, or attachment of separate skins, e.g. panels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/40—Weight reduction
Abstract
The invention belongs to the field of aircraft design and discloses an access cover suitable for a flexible skin wing. The access cover is provided with an inner layer of thin sheet, a middle layer of thin sheet and an outer layer of thin sheet, and the thin sheets are fixed by adhesion; a rectangular hole is formed in the middle of each sheet, and the hole of the middle sheet is larger, so that a mounting gap is formed between the inner sheet and the outer sheet; the cover is designed corresponding to the sizes of the three layers of sheets, and can be quickly assembled and disassembled between the inner layer sheet and the outer layer sheet through pushing and pulling operations; after the installation is finished, the periphery of the cover is positioned below the outer layer thin sheet, and the cover cannot fall off when the force is applied along the incoming flow direction; the outside of the cover is provided with a sheet-shaped operating handle along the incoming flow direction, which not only can facilitate the disassembly and the assembly, but also can reduce the wind resistance. The invention can provide a square maintenance covering cap which is light, reliable and convenient to disassemble and assemble for flexible skin wings of various aircrafts.
Description
Technical Field
The invention belongs to the field of aircraft design, and relates to an access cover suitable for a flexible skin wing.
Background
For a conventional rigid skin aircraft, to meet the requirements of internal equipment disassembly and structural maintenance, flap structures are usually installed on the wings, and these flaps are generally rigid structures and are connected with the skin through bolts. However, the high aspect ratio, low wing load aircraft represented by the solar unmanned aerial vehicle cannot meet the requirements of rigidity and weight at the same time if the conventional rigid skin is adopted, so that the aircraft usually adopts a flexible film material to maintain the wing shape, and if the conventional rigid flap is still adopted, the assembly difficulty between the flexible skin and the conventional rigid flap is high, and an additional weight cost is also paid. Thus, conventional rigid flaps have not been suitable for use with flexible skin wings.
The Chinese utility model patent with publication number CN204775984U discloses a light aircraft wing skin sheet metal covering cap, which is used for maintaining a large number of systems and structural members in the light aircraft wing, and comprises a cap body which is an oblong sheet metal structural member, and the edge of the cap body is bent to form a bent edge; the cover body is lapped with the aircraft wing skin to form a step-shaped structure, the height of the step-shaped structure is equal to the thickness of the aircraft wing skin, and the cover body penetrates through the cover fixing hole through the supporting plate nut group to be fixedly connected with the aircraft wing skin. In addition, a circular composite flap structure suitable for a flexible skin wing has also been proposed, which has two disadvantages: on one hand, when the mounting space on the skin is small, the maximum diameter of the skin is limited, so that the actual effective working space is limited; on the other hand, for parts such as the steering engine, the assembly and disassembly of the parts depend on the expansion of the assembly and disassembly spaces on the left side and the right side, and if the circular opening cover is adopted, the waste of the opening spaces on the upper side and the lower side can be caused.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the access cover suitable for the flexible skin wing, the access cover can be quickly assembled and disassembled through simple push-pull operation, and the access cover is large in effective operation space, light in weight and high in reliability.
The technical scheme of the invention is as follows:
an access cover suitable for a flexible skin wing comprises an inner layer sheet 1, a middle layer sheet 2, an outer layer sheet 3 and a detachable cover 4 which are sequentially stacked and arranged on the flexible skin from bottom to top;
the outer contours of the inner layer sheet 1, the middle layer sheet 2 and the outer layer sheet 3 are all rectangular and are assembled in an aligned mode;
rectangular holes are formed in the middle of the inner layer sheet 1, the middle layer sheet 2 and the outer layer sheet 3, and the length of the long edge of the rectangular hole of the inner layer sheet 1 isa 1 The length of the short side isb 1 (ii) a The length of the long side of the rectangular hole of the middle layer sheet 2 isa 2 The length of the short side isb 2 (ii) a The length of the long side of the rectangular hole of the outer layer sheet 3 isa 3 The length of the short side isb 3 ；
Wherein the content of the first and second substances,a 1 <a 2 and is anda 3 <a 2 ；b 1 <b 2 and is andb 3 <b 2 ；
the cover 4 is rectangular and has a long side of lengtha 4 The length of the short side isb 4 And is anda 4 > a 3 +(a 2 -a 3 )/2，b 4 >b 3 。
preferably, all the frames of the middle layer sheet 2 are equal in width.
Preferably, the first and second liquid crystal materials are,a 1 <a 3 ，b 1 <b 3 。
preferably, the long frame width of the inner layer sheet 1 and the outer layer sheet 3 is smaller than the short frame width.
Preferably, rectangular grooves 301 are symmetrically arranged at two ends of the short side of the rectangular hole of the outer layer sheet 3 away from the incoming flow, and the distance between the two rectangular grooves 301 isl，b 3 < b 4 <l。
Preferably, a sheet-shaped handle 401 is arranged in the middle of the cover 4, and the installation direction of the sheet-shaped handle 401 is the same as the incoming flow direction.
Preferably, the inner layer sheet 1, the middle layer sheet 2 and the outer layer sheet 3 are all made of carbon fiber-resin composite materials, and the number of the layers of the middle layer sheet 2 is the same as that of the cover 4; the material of the cover 4 is carbon fiber.
Preferably, four corners of the inner layer sheet 1, the middle layer sheet 2, the outer layer sheet 3 and the cover 4 are rounded.
Preferably, four corners of the rectangular holes of the inner layer sheet 1, the middle layer sheet 2 and the outer layer sheet 3 are rounded.
Compared with the prior art, the invention has the beneficial effects that:
1. the access cover suitable for the flexible skin wing provided by the invention omits connecting pieces such as bolts and the like, can be quickly assembled and disassembled by simple push-pull operation, is light in weight and can be attached to the appearance of the skin.
2. The access cover suitable for the flexible skin wing provided by the invention can flexibly design the length and width of the cover according to the actual access requirement, is particularly suitable for a narrow installation space, and can maximize the actual operation space.
3. The access cover suitable for the flexible skin wing provided by the invention has good stability. When the incoming flow causes external force to the covering cap, the covering cap is installed more firmly, so that falling off in the flying process is avoided.
4. The access cover suitable for the flexible skin wing provided by the invention can be widely applied to the flexible skin wing, and has important significance for the maintenance of aircraft equipment and structures with strict weight requirements.
Drawings
In order to illustrate embodiments of the present invention or technical solutions in the prior art more clearly, the drawings which are needed in the embodiments will be briefly described below, so that the features and advantages of the present invention can be understood more clearly by referring to the drawings, which are schematic and should not be construed as limiting the present invention in any way, and for a person skilled in the art, other drawings can be obtained on the basis of these drawings without any inventive effort. Wherein:
FIG. 1 is a schematic overall view of an access panel suitable for use with a flexible skin wing according to the present invention;
FIG. 2 is an exploded view of an access cover suitable for use with a flexible skin wing of the present invention;
FIG. 3 is a drawing showing the dimensions of an access cover component suitable for use with a flexible skin wing according to the present invention;
FIG. 4 is a graph showing the dimensional relationship between the parts of the inspection lid in example 1;
FIG. 5 is a schematic view showing the procedure of installing the service flaps in example 1;
FIG. 6 is a schematic view showing the cover entering the rectangular groove area in example 1;
fig. 7 is a schematic view showing a disassembly sequence of the service flap in embodiment 1.
Description of reference numerals:
1-inner layer sheet, 2-middle layer sheet, 3-outer layer sheet, 4-cover, 301-rectangular groove, 401-circular handle.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
As shown in fig. 1-2, the access door suitable for a flexible skin wing of the present invention has a rectangular structure as a whole, and includes an inner sheet 1, a middle sheet 2, an outer sheet 3, and a cover 4. The outer contours of the inner layer sheet 1, the middle layer sheet 2 and the outer layer sheet 3 are all rectangular, and the inner layer sheet, the middle layer sheet and the outer layer sheet are sequentially stacked and mounted on the flexible skin from bottom to top and can be connected with each other in a bonding mode. In order to disperse local stress, rounded corners may be provided at four corners of the inner sheet 1, the middle sheet 2, and the outer sheet 3. The materials of the inner layer sheet 1, the middle layer sheet 2 and the outer layer sheet 3 can be carbon fiber-resin composite materials, the layering direction is 0 degree/90 degrees, and the layering quantity of the middle layer sheet 2 is the same as that of the cover 4.
Fig. 3 is a drawing showing the dimensions of the access cover component suitable for the flexible skin wing.
Rectangular holes are formed in the middle of the inner layer sheet 1, the middle layer sheet 2 and the outer layer sheet 3, and four corners of each hole are rounded corners. The opening size of the middle layer sheet 2 is the largest, namely the reserved frame is the narrowest, the widths of the peripheral frames are the same, and the projection of the frame in the overlooking direction is the area where the inner, middle and outer layers of sheets are bonded with each other. Compared with the holes of the middle layer thin sheet 2, the holes of the inner layer thin sheet 1 and the outer layer thin sheet 3 are smaller and similar in size, but the upper, lower, left and right side lines of the rectangular holes of the inner layer thin sheet 1 and the outer layer thin sheet 3 are not completely overlapped, and a certain gap is reserved, so that the cover 4 can conveniently enter the rectangular holes; the upper and lower frames of the inner sheet 1 and the outer sheet 3 are relatively wide, and the left and right frames are relatively narrow, so that the cover 4 has a space for moving up and down.
The two ends of one short edge of the rectangular hole of the outer layer sheet 3 are symmetrically provided with rectangular grooves 301, the distance between the two rectangular grooves 301 is longer than the short edge, but is shorter than the short edge of the rectangular hole of the middle layer sheet 2, and the bottom corners of the rectangular grooves 301 are fillets for dispersing local stress.
Example 1
The cover 4 is rectangular in shape, and four corners are rounded. The size of the access cover is corresponding to the size of each part of the access cover. As shown in fig. 4, the width of the cover 4 is 91mm, which is close to but smaller than the width 92mm between the two rectangular grooves of the outer sheet 3, and is larger than the width 76mm of the rectangular hole of the outer sheet 3. The length of the cover 4 is 107mm, which is smaller than the length 108mm from the inner edge of the upper outer frame of the middle sheet 2 to the inner edge of the lower outer frame of the outer sheet 3, and is larger than the width 102mm from the inner edge of the upper outer frame of the outer sheet 3 to the inner edge of the lower outer frame of the middle sheet 2.
The middle of the cover 4 is provided with an arc-shaped handle 401 which is convenient for manual operation and disassembly; the installation direction of the circular arc handle 401 is consistent with the incoming flow direction, so that the resistance brought by flight is reduced.
When the access cover structure is assembled with the flexible skin, the inner layer thin sheet 1 is firstly bonded to an area needing an opening outside the flexible skin by using an adhesive, then the middle layer thin sheet 2 is bonded with the inner layer thin sheet 1 by using the adhesive, finally the outer layer thin sheet 3 is bonded with the middle layer thin sheet 2, and after the adhesive is cured, the flexible skin is cut off along the edge of the middle rectangular hole.
In use, the sequence of lid 4 installation is as shown in figure 5:
(1) firstly, one end of the cover 4 is inserted into a rectangular groove 301 at the back of the outer layer sheet 3 (see figure 6), so that the front part of the cover 4 is positioned in a gap between the inner layer sheet 1 and the outer layer sheet 3;
(2) holding the circular arc handle 401 by hand, pushing the cover 4 forward, so that the front part of the cover 4 enters the gap between the inner layer sheet 1 and the outer layer sheet 3 until the rear edge of the cover 4 enters the rectangular hole area of the outer layer sheet 3;
(3) the cover 4 is pulled back so that its rear portion enters the space between the inner sheet 1 and the outer sheet 3 and the leading edge of the cover 4 remains located in the space between the inner sheet 1 and the outer sheet 3.
In use, the sequence of removal of the cover 4 is shown in figure 7:
(1) holding the circular handle 401 by hand, pushing the cover 4 forward, so that the rear edge of the cover 4 enters the rectangular hole area of the outer sheet 3;
(2) pressing the rear region of the outer sheet 3 appropriately, so that the rear edge of the cover 4 protrudes from the plane of the outer sheet 3;
(3) the cover 4 is pulled back until it is completely detached from the outer sheet 3.
Furthermore, the foregoing describes only some embodiments and alterations, modifications, additions and/or changes may be made without departing from the scope and spirit of the disclosed embodiments, which are intended to be illustrative rather than limiting. Furthermore, the described embodiments are directed to embodiments presently contemplated to be the most practical and preferred, it being understood that the embodiments should not be limited to the disclosed embodiments, but on the contrary, are intended to cover various modifications and equivalent arrangements included within the spirit and scope of the embodiments. Moreover, the various embodiments described above can be used in conjunction with other embodiments, e.g., aspects of one embodiment can be combined with aspects of another embodiment to realize yet another embodiment. In addition, each individual feature or element of any given assembly may constitute additional embodiments.
The foregoing description of the embodiments has been presented for purposes of illustration and description and is not intended to be exhaustive or to limit the disclosure. The various elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.
Accordingly, it is to be understood that the drawings and description are proffered by way of example to facilitate comprehension of the invention and should not be construed to limit the scope thereof.
Claims (7)
1. An access opening cover suitable for a flexible skin wing is characterized by comprising an inner layer thin sheet (1), a middle layer thin sheet (2), an outer layer thin sheet (3) and a detachable cover (4), wherein the inner layer thin sheet, the middle layer thin sheet and the outer layer thin sheet are sequentially stacked and installed on the flexible skin from bottom to top;
the outer contours of the inner layer sheet (1), the middle layer sheet (2) and the outer layer sheet (3) are all rectangular and are assembled in an aligned mode;
rectangular holes are formed in the middle of the inner layer sheet (1), the middle layer sheet (2) and the outer layer sheet (3), and the length of the long edge of the rectangular hole of the inner layer sheet (1) isa 1 The length of the short side isb 1 (ii) a The length of the long side of the rectangular hole of the middle layer sheet (2) isa 2 The length of the short side isb 2 (ii) a The length of the long side of the rectangular hole of the outer layer sheet (3) isa 3 The length of the short side isb 3 ；
Wherein the content of the first and second substances,a 1 <a 2 and is anda 3 <a 2 ；b 1 <b 2 and is made ofb 3 <b 2 ；
The cover (4) is rectangular, and the length of the long edge isa 4 The length of the short side isb 4 And is made ofa 4 > a 3 +(a 2 -a 3 )/2，b 4 >b 3 ；
a 1 <a 3 ，b 1 <b 3 ；
The two ends of the short edge of the rectangular hole of the outer layer sheet (3) far away from the incoming flow are symmetrically provided with rectangular grooves (301), and the distance between the two rectangular grooves (301) isl，b 3 < b 4 <l。
2. Access flap according to claim 1, characterized in that all the borders of the middle sheet (2) are of equal width.
3. Access opening cover according to claim 1, characterized in that the long border width of both the inner sheet (1) and the outer sheet (3) is smaller than the short border width.
4. Access door according to claim 1, characterized in that a sheet-like handle (401) is provided in the middle of the cover (4), the sheet-like handle (401) being mounted in the same direction as the incoming flow.
5. Access cover according to claim 1, characterized in that the material of the inner sheet (1), the middle sheet (2) and the outer sheet (3) is a carbon fiber-resin composite material, the number of plies of the middle sheet (2) being the same as the cover (4); the cover (4) is made of carbon fiber.
6. Access opening cover according to claim 1, characterized in that the four corners of the inner sheet (1), the middle sheet (2), the outer sheet (3) and the cover (4) are rounded.
7. Access opening cover according to claim 1, characterized in that the four corners of the rectangular holes of the inner (1), middle (2) and outer (3) sheets are rounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210565866.1A CN114715376B (en) | 2022-05-24 | 2022-05-24 | Maintenance flap suitable for flexible skin wing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210565866.1A CN114715376B (en) | 2022-05-24 | 2022-05-24 | Maintenance flap suitable for flexible skin wing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114715376A CN114715376A (en) | 2022-07-08 |
| CN114715376B true CN114715376B (en) | 2022-09-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210565866.1A Active CN114715376B (en) | 2022-05-24 | 2022-05-24 | Maintenance flap suitable for flexible skin wing |
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| CN (1) | CN114715376B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4579248A (en) * | 1983-11-10 | 1986-04-01 | The Boeing Company | Access panel assembly for aircraft fuel tank |
| CN204775984U (en) * | 2015-06-19 | 2015-11-18 | 中国航空工业集团公司西安飞机设计研究所 | Light aerocraft wing covering panel beating flap |
| CN110481754A (en) * | 2019-08-22 | 2019-11-22 | 北京航空航天大学 | A kind of simple port cover structure for solar energy unmanned plane flexible covering opening |
| CN212313890U (en) * | 2020-09-15 | 2021-01-08 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | Structure of fuel tank opening cover and peripheral area of opening cover of airplane wing |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2347507B1 (en) * | 2007-12-27 | 2011-08-17 | Airbus Operations, S.L. | OPTIMIZED AIRCRAFT ACCESS MOUTH. |
-
2022
- 2022-05-24 CN CN202210565866.1A patent/CN114715376B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4579248A (en) * | 1983-11-10 | 1986-04-01 | The Boeing Company | Access panel assembly for aircraft fuel tank |
| CN204775984U (en) * | 2015-06-19 | 2015-11-18 | 中国航空工业集团公司西安飞机设计研究所 | Light aerocraft wing covering panel beating flap |
| CN110481754A (en) * | 2019-08-22 | 2019-11-22 | 北京航空航天大学 | A kind of simple port cover structure for solar energy unmanned plane flexible covering opening |
| CN212313890U (en) * | 2020-09-15 | 2021-01-08 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | Structure of fuel tank opening cover and peripheral area of opening cover of airplane wing |
Non-Patent Citations (1)
| Title |
|---|
| 民用飞机复合材料机翼检修口盖设计;魏士礼;《科技创新导报》;20170401(第10期);全文 * |
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| CN114715376A (en) | 2022-07-08 |
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