Anti-backflow drainage structure for aircraft turnarounds

Abstract

The application discloses a backflow prevention drainage structure for an aircraft turnover cabin, which comprises a turnover cabin arranged on an aircraft in a hanging mode, a cabin body of the turnover cabin is provided with a drainage hole in a lowest position, and the backflow prevention structure is arranged at the drainage hole and covers the drainage hole, wherein a water blocking part and a drainage part are arranged on the backflow prevention structure; the drainage part is communicated with the drainage hole, and the water blocking part is located below the drainage hole after the cabin body is turned over. The application can provide the drainage function of the drainage hole on the aircraft turnover cabin in different position states of the cabin body by adding the backflow prevention structure, and can also prevent rain. The application has the advantages of simple structure, convenient processing and molding, low production cost, and adaptability to the turnover action of the aircraft turnover cabin, so that the normal drainage function of the drainage hole is ensured when the drainage hole is in a low position, and the good rainwater backflow prevention effect is provided when the drainage hole is in a high position.

Description

Technical Field

[0001] This invention relates to the field of aircraft component technology, and in particular to an anti-backflow drainage structure for aircraft tilting cabins. Background Technology

[0002] As aircraft increasingly demand higher levels of aerodynamic and stealth technology, the requirements for aircraft external stores have also shifted from fixed sling-mounted to flip-down and retractable designs. Consequently, the cabin structure of aircraft external stores also faces new design requirements.

[0003] In the design of the external pod's cabin structure, considering rainwater received due to rain and condensation caused by temperature differences in the equipment, a drainage structure needs to be added to the cabin structure to prevent water accumulation inside the cabin. The drainage structure of a traditional fixed pod cabin is usually a drain hole located at the lowest point of the cabin; however, in a flip-type cabin structure, such as... Figure 4 As shown, due to the flipping action of the cabin 100, the lowest position of the cabin 100 is not fixed. After the cabin 100 flips, the drain hole 200, which was originally in the lowest position, will also be moved to a higher position as the cabin 100 rotates. At this time, it is not only difficult to drain the water inside the cabin 100, but the drain hole 200 may also become a new water inlet, thereby aggravating the water accumulation inside the cabin. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a backflow prevention and drainage structure for aircraft rollover cabins with good drainage and water ingress prevention effects.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an anti-backflow drainage structure for an aircraft tilting cabin, including a tilting cabin externally mounted on the aircraft, a drainage hole provided at the lowest position of the tilting cabin body, and an anti-backflow structure provided at and covering the drainage hole, wherein the anti-backflow structure is provided with a water-blocking part and a drainage part; the drainage part is connected to the drainage hole, and the water-blocking part is located below the drainage hole after the cabin body is tilted. This invention adds an anti-backflow structure to the aircraft tilting cabin to assist the drainage holes in achieving a drainage function adapted to the tilting action of the tilting cabin. When the aircraft tilting cabin is not tilting, the drainage part in the anti-backflow structure can cooperate with the drainage holes to guide the water accumulated inside the cabin to the drainage holes for normal drainage. When the aircraft tilting cabin is tilting, the water-blocking part on the anti-backflow structure can block water from below the drainage holes after the aircraft tilting cabin is tilted. Rainwater that flows back into the cabin from the drainage holes is blocked by the water-blocking part and cannot flow into the cabin, thereby preventing the water accumulated inside the cabin from flowing back into the cabin from the drainage holes. Therefore, this invention can provide drainage function for the drainage holes on the aircraft tilting cabin when the cabin is in different positions by adding an anti-backflow structure, and can also prevent rain from falling.

[0006] As an improvement to the above solution: the anti-backflow structure is an anti-backflow cover plate, the edge of which is bent and fixed to the hull to form a raised structure that blocks the drainage hole. The side of the anti-backflow cover plate below the drainage hole after the hull is flipped over is a water-blocking part; it also includes a drainage channel that communicates with the drainage hole and extends from the inside of the anti-backflow cover plate to other bent edges of the anti-backflow cover plate, the drainage channel being a drainage part. In this invention, a simple anti-backflow cover plate is used as the anti-backflow structure. The anti-backflow cover plate can be directly formed from a metal plate by stamping or machining, which can effectively simplify the structure of the anti-backflow structure and save production costs; the raised structure formed by the anti-backflow cover plate covering the drainage hole can effectively block backflowing rainwater.

[0007] As an improvement to the above solution: the anti-backflow cover is a rectangular cover, and each of the bent edges of the anti-backflow cover, excluding the water-blocking part, is provided with a through hole communicating with the drainage channel; the drainage channel is a three-way channel communicating with each through hole. The shape of the anti-backflow cover in this invention has multiple implementation options, such as a circular cover, a triangular cover, or a polygonal cover; in this invention, a rectangular cover is the optimal solution for the anti-backflow cover, as the four bent edges of the rectangular cover can better adapt to the tilting action of the tilting cabin and the flow direction of accumulated water, thus covering more drainage paths while minimizing the number of through holes.

[0008] As an improvement to the above solution: the through holes on the bent edges of the anti-backflow cover plate, which communicate with the drainage channel, are respectively located at the middle of their respective bent edges. The drainage holes are offset from the center of the anti-backflow cover plate and are located close to the water-blocking part of the anti-backflow cover plate. The bent edges of the anti-backflow cover plate, which serve as the water-blocking part, protrude outwards so that the middle of the drainage channel forms an arc-shaped transition part that protrudes towards the drainage hole. The edge of the drainage hole is flush with the arc-shaped transition part of the drainage channel. In this invention, by optimizing the structure of the anti-backflow cover plate, a downwardly recessed arc-shaped transition part is formed on the lowermost bent edge of the anti-backflow cover plate after the cabin is flipped, which cooperates with the drainage hole. Rainwater that flows back in through the drainage hole will first collect at the arc-shaped transition part. Due to the concave structure of the arc-shaped transition part, the backflowing rainwater is prevented from flowing to both sides and cannot flow into the cabin, but can only be discharged to the outside of the cabin through the drainage hole, which can effectively improve the rainproof effect of this invention.

[0009] As an improvement to the above solution: the bent edge of the anti-backflow cover, which serves as the water-blocking part, is inclined to form a slope with an angle ≥15°. By setting the bent edge of the anti-backflow cover, which serves as the water-blocking part and is located at the bottom after the cabin is flipped, as a slope, this invention allows rainwater that has flowed back into the drainage holes to quickly flow out of the cabin, preventing overflow due to excessive accumulation of backflowing rainwater.

[0010] As an improvement to the above solution: the minimum edge distance between the drainage hole and the through hole located on the bent edges of both sides of the anti-backflow cover plate is ≥5mm. This invention further optimizes the position of the branch channels on the drainage channel, so that the branch channels on both sides of the drainage channel are located above the drainage hole after the anti-backflow cover plate flips with the cabin, and the minimum edge distance between them is not less than 5mm. Therefore, even if rainwater backflows at the drainage hole, due to the height difference between the outlet of the drainage channel and the drainage hole, the accumulated water will not backflow into the cabin through the outlet of the drainage channel.

[0011] As an improvement to the above solution: the diameter of the drainage hole is ≥8mm; the drainage channel is a rectangular channel with a channel size ≥6mm×10mm.

[0012] As an improvement to the above solution: the anti-backflow structure is fixed to the cabin body by multiple rivets, and a sealing layer is provided at the joint between the anti-backflow structure and the cabin body. This invention improves the sealing effect between the anti-backflow structure and the cabin body by adding a sealing layer between them, preventing rainwater entering through the drainage holes from seeping into the cabin interior via capillary action, thus further enhancing the anti-backflow effect of this invention.

[0013] The beneficial effects of this invention are as follows: This invention assists the drainage holes in achieving a drainage function adapted to the tilting action of the aircraft tilting cabin by adding an anti-backflow structure to the cabin body. When the aircraft tilting cabin body is not tilting, the drainage part in the anti-backflow structure can cooperate with the drainage holes to guide the water accumulated inside the cabin to the drainage holes for normal drainage. When the aircraft tilting cabin body tilts, the water-blocking part on the anti-backflow structure can block water from below the drainage holes after the aircraft tilting cabin body tilts, preventing rainwater from backflowing into the cabin body through the drainage holes from entering. The water-blocking structure prevents water from flowing into the cabin, thus avoiding backflow of water into the cabin through the drainage holes. Therefore, this invention can provide drainage for the drainage holes on the aircraft's tilting cabin in different cabin positions by adding an anti-backflow structure, while also providing rain protection. The invention has a simple structure, is easy to process and form, and has low production costs. It can be adapted to the tilting action of the aircraft's tilting cabin, ensuring normal drainage when the drainage hole is in a low position, and providing good rainwater backflow prevention when the drainage hole is in a high position. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention;

[0015] Figure 2 This is a side sectional view of the present invention;

[0016] Figure 3 This is a side view of the present invention;

[0017] Figure 4 This is a schematic diagram showing the position of the anti-backflow structure in this invention as the cabin flips to different positions.

[0018] The markings in the diagram are: 100-hull, 200-drain hole, 300-anti-backflow cover, 400-drainage channel, 500-rivet, 600-sealing layer. Detailed Implementation

[0019] To facilitate understanding of the present invention, the invention will be further described below with reference to the accompanying drawings.

[0020] In the description of this invention, it should be noted that the terms "front", "rear", "left", "right", "up", "down", "inner", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0021] like Figures 1 to 3As shown, the anti-backflow drainage structure for aircraft tilting cabin disclosed in this invention adds an anti-backflow structure to the original drainage hole 200 on the cabin body 100 of the aircraft tilting cabin to enhance its anti-rain backflow function, while ensuring that it can perform normal drainage function when the height and orientation of the drainage hole 200 changes due to the tilting action of the cabin body 100. In the anti-backflow structure of the present invention, the part that ensures the normal drainage function of the drainage hole 200 is the drainage part, and the part that ensures that rainwater will not backflow into the drainage hole 200 is the water-blocking part. The drainage part is connected to the drainage hole 200 to allow the water inside the cabin 100 to flow through the drainage hole 200. The drainage part guides the water inside the cabin 100 so that the water inside the cabin 100 can flow quickly to the drainage hole 200 and be discharged to the outside of the cabin 100. After the cabin 100 is flipped, the water-blocking part is located below the drainage hole 200. The water-blocking part blocks the rainwater that backflows into the cabin 100 through the drainage hole 200, preventing the rainwater from entering the cabin 100.

[0022] Specifically, the anti-backflow structure used in this invention is an anti-backflow cover 300 made of lightweight aerospace aluminum alloy sheet material through edge bending and drilling. It can be manufactured using simple stamping or machining processes. The surface of the anti-backflow cover 300 can be treated with conventional anti-corrosion processes used in the production of aerospace structural components. Figures 1 to 3 As shown, the edge of the anti-backflow cover 300 is bent and connected and fixed to the inner side of the cabin 100 to form a raised cover structure above the drain hole 200, which covers the drain hole 200. The interior of the anti-backflow cover 300 is a hollow cavity, forming a drainage channel 400 communicating with the drain hole 200 as the drainage part of the anti-backflow structure; Figures 1 to 3 Taking the case where the inner side of the shown compartment 100 is a vertical plane as a reference, the bottommost bent edge of the anti-backflow cover 300 serves as a water-blocking part of the anti-backflow structure. This bent edge, serving as a water-blocking part, is a closed edge. Through holes are opened on the other bent edges of the anti-backflow cover 300, connecting to the drainage channel 400 as drainage inlets for water accumulating inside the compartment 100. Figure 4 As shown, when the cabin 100 is not overturned, the anti-backflow cover 300 and the drain hole 200 are located at the lowest position of the cabin 100. At this time, the side of the cabin 100 with the anti-backflow cover 300 and the drain hole 200 is a horizontal plane. Water inside the cabin 100 collects on the inner side at the lowest point. The water enters the drain channel 400 through the through hole on the bent edge of the anti-backflow cover 300, and then, guided by the drain channel 400, enters the drain hole 200 and is discharged to the outside of the cabin 100. Figure 4As shown, when the cabin 100 is flipped, the anti-backflow cover 300 and the drainage hole 200 are no longer located at the lowest position of the cabin 100 but rotate to a higher position. At the same time, the side of the cabin 100 where the anti-backflow cover 300 and the drainage hole 200 are located flips from a plane to a vertical plane. At this time, if rainwater backflows into the cabin 100 through the drainage hole 200, the rainwater is blocked by the bent edge of the anti-backflow cover 300 located below the drainage hole 200 as a water-blocking part and cannot fall into the cabin 100. It can only collect here and then be discharged to the outside of the cabin 100 through the drainage hole 200.

[0023] The anti-backflow cover 300 used in this invention has various shapes, such as triangular, circular, rectangular, polygonal, or even other irregular shapes, as long as they satisfy the above-mentioned structures of the water-blocking and drainage parts. However, this invention uses a rectangular cover as the most preferred solution because the number of sides and their corresponding orientations are more compatible with the tilting motion of the aircraft's tilting cabin. Figure 1 As shown, the drainage channel 400 in the anti-backflow cover 300, which adopts a rectangular cover plate structure, is a three-way channel. Each of the bent edges of the anti-backflow cover 300, excluding the water-blocking portion, is provided with a through hole communicating with the drainage channel 400. Furthermore, to improve drainage efficiency, the diameter of the drainage hole 200 is limited to ≥8mm, and the drainage channel 400 is limited to a rectangular channel with a channel size ≥6mm × 10mm.

[0024] Furthermore, the structure of the anti-backflow cover 300 is optimized in this invention, such that the through holes communicating with the drainage channel 400 on the bent edge of the anti-backflow cover 300 are respectively located at the middle part of their respective bent edges, while the drainage holes 200 are offset from the center of the anti-backflow cover 300 and set close to the water-blocking part of the anti-backflow cover 300, that is, with Figure 1 With the vertical plane of the shown compartment 100 as a reference, the drain hole 200 is located below the branch channels on both sides of the drainage channel 400, resulting in a certain height difference between the drain hole 200 and the branch channels on both sides of the drainage channel 400. This height difference prevents rainwater flowing back into the compartment 100 from entering through the branch channels on both sides of the drainage channel 400. Considering the possibility of overflow due to excessive accumulation of backflowing rainwater, the specific value of the aforementioned height difference is limited in this invention, such as... Figure 2 As shown, the minimum edge distance between the drain hole 200 and the through hole located on both sides of the backflow prevention cover 300 is ≥5mm. The size limit of this height difference ensures that no overflow will occur.

[0025] Furthermore, based on the structural improvements of the anti-backflow cover 300 described above, the present invention optimizes the structure of the bent edge of the anti-backflow cover 300 as a water-blocking part, making the bent edge of the anti-backflow cover 300 as a water-blocking part protrude outward so that the middle part of the drainage channel 400 forms an arc-shaped transition part protruding towards the drainage hole 200, and limiting the edge of the drainage hole 200 to be flush with the arc-shaped transition part of the drainage channel 400. The arc-shaped transition part formed on the water-blocking part collects the rainwater that backflows into the drainage hole 200. The rainwater that backflows into the drainage hole first collects at the arc-shaped transition part. Due to the concave structure of the arc-shaped transition part, the backflowing rainwater is prevented from flowing to both sides and cannot flow into the interior of the compartment 100, but can only be discharged to the outside of the compartment 100 through the drainage hole 200, which can effectively improve the anti-rain backflow effect of the present invention. Furthermore, the bent edge of the anti-backflow cover 300 as a water-blocking part can be further set as a slope, such as... Figure 2 As shown, by making the bent edge of the anti-backflow cover 300, which serves as a water-blocking part, form an inclined surface with an angle of ≥15° between it and the position perpendicular to the inner side of the cabin 100, the rainwater collected at the arc-shaped transition part can be discharged to the outside of the cabin 100 more quickly.

[0026] In this invention, the anti-backflow cover 300 is made of aerospace-grade aluminum alloy and can therefore be fixed using riveting techniques commonly used in aircraft manufacturing. Multiple rivets 500 are used to fix the anti-backflow cover 300 to the inner side of the cabin 100. To improve the sealing effect at the connection between the anti-backflow cover 300 and the cabin 100, and to prevent rainwater from backflowing through the drain hole 200 from seeping into the cabin 100 through capillary action and causing water accumulation or structural corrosion due to prolonged immersion, such as... Figure 2 As shown, a sealing layer 600 can be added between the anti-backflow cover 300 and the cabin 100. The sealing layer 600 can be formed by applying XM-22B or other aviation sealant to the joint.

Claims

1. A backflow prevention and drainage structure for an aircraft tilting cabin, comprising a tilting cabin externally mounted on the aircraft, wherein a drainage hole (200) is provided at the lowest position of the cabin body (100), characterized in that: It also includes an anti-backflow structure provided at and covering the drain hole (200), the anti-backflow structure having a water-blocking part and a drainage part; the drainage part is connected to the drain hole (200), and the water-blocking part is located below the drain hole (200) after the cabin (100) is flipped over; The anti-backflow structure is an anti-backflow cover plate (300). The edge of the anti-backflow cover plate (300) is bent and connected and fixed to the inner side of the cabin (100) to form a protruding structure that blocks the drain hole (200). The side of the anti-backflow cover plate (300) below the drain hole (200) after the cabin (100) is flipped is a water-blocking part. The drain part is a drain channel (400) that communicates with the drain hole (200) and extends from the inside of the anti-backflow cover plate (300) to other bent edges of the anti-backflow cover plate (300). The drain channel (400) communicates with the drain hole (200) to guide the water accumulated inside the cabin (100) to flow from the drain part to the drain hole (200).

2. The anti-backflow drainage structure for aircraft tilting cabins as described in claim 1, characterized in that: The anti-backflow cover (300) is a rectangular cover, and each of the other bent edges of the anti-backflow cover (300) except for the water-blocking part is provided with a through hole that communicates with the drainage channel (400); the drainage channel (400) is a three-way channel that communicates with each through hole.

3. The anti-backflow drainage structure for aircraft tilting cabins as described in claim 2, characterized in that: The through holes on the bent edge of the anti-backflow cover (300) that communicate with the drainage channel (400) are located at the middle part of their respective bent edges. The drainage hole (200) is offset from the center of the anti-backflow cover (300) and is set close to the water-blocking part of the anti-backflow cover (300). The bent edge of the anti-backflow cover (300) as the water-blocking part protrudes outward so that the middle part of the drainage channel (400) forms an arc-shaped transition part that protrudes towards the drainage hole (200). The edge of the drainage hole (200) is flush with the arc-shaped transition part of the drainage channel (400).

4. The anti-backflow drainage structure for aircraft tilting cabins as described in claim 3, characterized in that: The anti-backflow cover (300) is inclined at the bent edge of the water-blocking part and forms an inclined surface with an angle of ≥15° with respect to the orientation perpendicular to the inner side of the cabin (100).

5. The anti-backflow drainage structure for aircraft tilting cabins as described in claim 3, characterized in that: The minimum edge distance between the drainage hole (200) and the through hole located on the bent edge on both sides of the anti-backflow cover plate (300) is ≥5mm.

6. The anti-backflow drainage structure for aircraft tilting cabins as described in claim 1, characterized in that: The diameter of the drainage hole (200) is ≥8mm; the drainage channel (400) is a rectangular channel with a channel size of 6mm×10mm.

7. The anti-backflow drainage structure for aircraft tilting cabins as described in claim 1, characterized in that: The anti-backflow structure is fixed to the cabin (100) by multiple rivets (500), and a sealing layer (600) is provided at the joint between the anti-backflow structure and the cabin (100).

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