Detachable gap fireproof structure

Abstract

The invention relates to the technical field of aircraft structure design, in particular to a detachable gap fireproof structure. The sealing rubber strip is of a herringbone structure, a connecting handle is arranged on the lower portion of the sealing rubber strip, the lower surface of the connecting handle is attached to the inner surface of the sealing plate, the bottom edge A of the fireproof plate is attached to the outer surface of the sealing plate, meanwhile, the vertical edge A of the fireproof plate is attached to the outer surface, close to the outer side sealing edge, of the sealing rubber strip, and the bottom edge B of the rubber pressing strip is attached to the upper surface of the connecting handle. The vertical edge B of the rubber pressing strip is attached to the outer surface, close to the inner side sealing edge, of the sealing rubber strip. The bolts sequentially penetrate through the bottom edge A, the sealing plate, the connecting handle and the bottom edge B and are fixed through the nuts to form a detachable sealing structure, the two sides of the skin are fixed to the connecting ribs through the high-locking bolts respectively, and the two edges, in the heading direction, of the sealing plate are fixed to the two connecting ribs through the bolts and the supporting plate nuts. The sealing plate is detachable through the bolts and the nuts; and through the sealing rubber piece, the rubber pressing strip and the fireproof plate, sealing and fire prevention of the gap are achieved.

Description

Technical Field

[0001] This invention relates to the field of aircraft structural design technology, and to a detachable gap fireproof structure. Background Technology

[0002] With the development of the civil aviation industry, aircraft safety and reliability have become a common focus for aircraft manufacturers, operators, and airworthiness authorities. Fire, as one of the potential safety threats to civil aircraft, makes its preventative design crucial.

[0003] Fire protection design of aircraft structures is a core aspect of aviation safety. It requires a combination of material selection, system isolation, active fire suppression, and passive fire protection to ensure that the spread of fire is slowed, critical system functions are protected, and time is gained for personnel evacuation in the event of a fire. Summary of the Invention

[0004] Purpose of the invention This invention belongs to the field of aircraft structural design technology, specifically relating to a detachable fireproof structure design for gaps. The main structure includes sealing rubber components, rubber strips, fire-resistant plates, blocks, connecting ribs on both sides, a skin, and a sealing plate. This structure achieves fireproofing of the gaps in the detachable sealing plate through sealing with rubber components and sealing with fire-resistant plates and blocks, meeting fire resistance requirements (fire resistance time 5 minutes).

[0005] Technical solution A detachable fireproof structure with gaps includes a sealing rubber strip, a rubber pressure strip, a fire baffle, a stop block, connecting ribs, a skin, and a sealing plate. The sealing rubber strip has a herringbone structure with a connecting handle at the bottom. The lower surface of the connecting handle is in contact with the inner surface of the sealing plate. The bottom edge A of the fire baffle is in contact with the outer surface of the sealing plate, while the vertical edge A of the fire baffle is in contact with the outer surface of the outer sealing edge of the sealing rubber strip. The bottom edge B of the rubber pressure strip is in contact with the upper surface of the connecting handle, and the vertical edge B of the rubber pressure strip is in contact with the outer surface of the inner sealing edge of the sealing rubber strip. Bolts pass through the bottom edge A, the sealing plate, the connecting handle, and the bottom edge B in sequence and are fixed with nuts to form a detachable sealing structure. The two sides of the skin are fixed to the connecting ribs with high-strength bolts. The two edges of the sealing plate along the flight direction are fixed to the two connecting ribs with bolts and support plate nuts.

[0006] Furthermore, the sealing rubber component is made of fire-retardant rubber. The outer layer of the sealing rubber component is wrapped with a layer of glass fabric, and an inner layer of glass fabric is embedded, forming a 3-layer fabric. The inner and outer sealing edges and the mounting handle are all made of 3 layers of glass fabric, and the thickness of a single rubber layer is at least 2mm.

[0007] Furthermore, the sealing rubber strip has extension edges on both the outer and inner sealing edges. The function of the extension edges is to seal the gap between the honeycomb slope area on both sides of the skin and the sealing plate.

[0008] Furthermore, it also includes a stop block, which is a machined corner box that is fastened to the connecting rib and forms a labyrinthine loop with the sealing edge of the sealing rubber strip to seal the gaps in the sloping areas on both sides of the skin.

[0009] Furthermore, the stop block is made of aluminum alloy.

[0010] Furthermore, the skin adopts a composite honeycomb structure, with a honeycomb area in the middle and a laminated area around it. The laminated areas on both sides are connected to the connecting ribs on both sides with fasteners.

[0011] Furthermore, the sealing plate is made of composite material with a honeycomb structure. The middle part is a honeycomb area, and the surrounding part is a laminated area. The laminated areas on both sides are connected to the connecting ribs on both sides with bolts. The rear laminated area is connected to the sealing rubber parts, rubber pressure strips, and fire baffle with bolts. The bolt heads are on one side of the sealing plate and the bolt heads are sealed with fireproof sealant.

[0012] Furthermore, the fire baffle is made of titanium alloy and is a sheet metal part with a minimum thickness of 0.4mm. The fire baffle extends along the sloping areas of the skin on both sides and the sealing rubber parts to cover and protect the gaps between the skin and the sealing plate and the sealing rubber strip.

[0013] Furthermore, the rubber pressure strip is made of aluminum alloy and is a sheet metal part. It is installed inside the sealing rubber part and extends with the sealing rubber part in the sloping area of ​​the skin on both sides.

[0014] Technical effect This structure uses fireproof sealing rubber parts (1) to seal the gap between the upper skin (6) and the sealing plate (7). On the outside, titanium alloy fireproof plates (3) are used to shield and protect the gap and the fireproof sealing rubber parts (1). At the same time, the sealing edge of the fireproof sealing rubber parts (1) is extended in the sloping area of ​​the upper skin on both sides. On the fixed connecting ribs (5) on both sides, metal blocks (4) are added between the outer and inner sealing edges of the fireproof sealing rubber parts (1) to form a maze-shaped loop, thereby achieving the fireproof effect and meeting the fire resistance requirements of the entire structure.

[0015] 1. Detachable structure: The sealing plate is detachable via bolts and nuts; 2. Sealing of gaps: Fireproofing and sealing of gaps are achieved through sealing rubber parts, rubber strips, and fire baffles; Fireproof sealing rubber parts (1) The base material is fireproof rubber. The structure is herringbone. The lower part is a connecting handle and the upper part has two sealing edges. The connecting handle and sealing edges are covered with a layer of glass fiber and embedded with a layer of glass fabric. The minimum thickness is greater than 2mm. Both sealing edges have 3 layers of fabric and the minimum thickness is greater than 2mm. They all meet the fireproof requirements. The two sealing edges can ensure fire resistance.

[0016] The fire baffle (3) connected to the outside is made of titanium alloy. The thickness of the titanium alloy material is greater than 0.4mm, which meets the fire resistance requirements. The thickness of this fire baffle (3) is greater than 0.4mm, which meets the fire resistance requirements. The outside of the fire baffle is coated with fireproof paint to delay the conduction of heat.

[0017] At both ends, the slope area of ​​the skin (6), the vertical edges of the sealing rubber component (1), the fire baffle (3) and the rubber pressure plate (2) are extended to seal the gaps in the slope area and the laminated area. At the same time, on the connecting ribs (5) on both sides, between the outer and inner sealing edges of the sealing rubber component (1), aluminum alloy blocks are added to form a maze-shaped loop with the sealing edge of the sealing rubber strip (1) to seal the gaps.

[0018] To prevent heat from being conducted to the interior through the bolts connecting the sealing rubber part (1) and the sealing plate (7), which could cause the internal sealant to ignite, the connecting bolts are not wet-assembled, the inner support plate nut is not sealed, the mating surface (including between the support plate nut and the rubber strip) is not sealed, and the outer bolt head is sealed. Attached Figure Description

[0019] Figure 1 : Overall structural diagram of the detachable gap fireproof structure; Figure 2 : Structural diagram of the sealing rubber component; Figure 3 : Structural diagram of rubber component pressure strip; Figure 4 : Structural diagram of the fire baffle; Figure 5 : Structural diagram of the stop block; Figure 6 : Structural diagram of the connecting ribs on both sides; Figure 7 : Structural diagram of the skin; Figure 8 : Structural diagram of the sealing plate; Figure 9 The overall structure of the detachable gap fireproof structure (assembled state); Figure 10 Cross-sectional view of the sealing rubber component; Figure 11 : Schematic diagram of the connection between the skin and the connecting ribs and blocks on both sides; Figure 12 : Diagram showing the connection between the sealing plate, sealing rubber components, pressure strip, and fire baffle. Figure 13 :Installation diagram of sealing plate; Figure 14 : Cross-sectional view; Figure 15 : Schematic diagram of the skin slope area.

[0020] Explanation of reference numerals in the attached diagram: Sealing rubber strip (1), rubber pressure strip (2), fire baffle (3), baffle (4), connecting ribs on both sides (5), skin (6), sealing plate (7). Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setup and method set forth below, but covers any improvements, substitutions, and modifications to the structures, methods, and devices without departing from the spirit of the invention. In the following description, well-known structures and techniques are not shown to avoid unnecessarily obscuring the invention.

[0023] In the description of this invention, it should be noted that the directions or positional relationships indicated by terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are based on the stated directions or positional relationships and are only for the convenience of describing and simplifying the invention, and should not be construed as limiting the invention. Furthermore, the use of ordinal numbers (e.g., "first and second," etc.) is for distinguishing objects and is not limited to this order, and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly, encompassing both direct connection and indirect connection via an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0025] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to and in conjunction with the embodiments.

[0026] Example A detachable gap fireproof structure includes a sealing rubber strip (1), a rubber pressure strip (2), a fire baffle (3), a stop block (4), a connecting rib (5), a skin (6), and a sealing plate (7). The sealing rubber strip (1) has a herringbone structure with a connecting handle at the bottom. The lower surface of the connecting handle is in contact with the inner surface of the sealing plate (7). The bottom edge A of the fire baffle (3) is in contact with the outer surface of the sealing plate (7), while the vertical edge A of the fire baffle (3) is in contact with the outer surface of the outer sealing edge of the sealing rubber strip (1). The bottom edge B of the rubber pressure strip (2) is in contact with the upper surface of the connecting handle, and the vertical edge B of the rubber pressure strip (2) is in contact with the outer surface of the inner sealing edge of the sealing rubber strip (1). The bolts pass through the bottom edge A, the sealing plate (7), the connecting handle, and the bottom edge B in sequence, and are fixed with nuts to form a detachable sealing structure. The two sides of the skin (6) are fixed to the connecting ribs (5) by high-locking bolts. The two sides of the sealing plate (7) along the flight direction are fixed to the two connecting ribs (5) by bolts and support plate nuts.

[0027] Furthermore, the sealing rubber component (1) is made of fire-resistant rubber. The outer surface of the sealing rubber component (1) is wrapped with a layer of glass fabric, and an inner layer of glass fabric is embedded, forming three layers of fabric. The inner and outer sealing edges and the mounting handle are all made of three layers of glass fabric, and the minimum thickness of a single rubber layer is 2mm. The reason for the three-layer design of the sealing rubber component (1) is to maintain hardness and meet fire protection requirements. Pure rubber has poor hardness. Adding fabric as a skeleton can improve the overall hardness. At the same time, as a skeleton, it can maintain the integrity of the structure after the rubber burns. The minimum thickness of the rubber component reaches 2mm, and the three layers of fabric can meet the fire protection requirements. The gap here uses two sealing edges, an inner one and an outer one. Each sealing edge meets the requirement of a minimum thickness of 2mm and three layers of fabric to ensure that it can meet the fire protection requirements.

[0028] In one embodiment of the present invention, preferably, the sealing rubber strip (1) has an extension edge on both the outer sealing edge and the inner sealing edge. The function of the extension edge is to seal the gap between the honeycomb slope area on both sides of the skin and the sealing plate. Since the two sides of the skin need to be connected with the connecting ribs on both sides by the laminated area, and the honeycomb area in the middle needs to be transitioned by the oblique cut, the sealing edge of the sealing rubber strip needs to be extended accordingly in order to seal the gap in the slope area.

[0029] In one embodiment of the present invention, preferably, a stop block (4) is also included. The stop block (4) is a machined corner box, which is set on the connecting rib (5) by fasteners and forms a maze-shaped loop with the sealing edge of the sealing rubber strip (1) to seal the gaps in the sloping areas on both sides of the skin (6).

[0030] In one embodiment of the present invention, preferably, the stop block (4) is made of aluminum alloy.

[0031] In one embodiment of the present invention, preferably, the skin (6) is made of composite material, honeycomb structure, 3 cores 3, with the middle being a honeycomb area and the surrounding area being a laminated area, and the laminated areas on both sides being connected to the connecting ribs on both sides by fasteners.

[0032] In one embodiment of the present invention, preferably, the sealing plate (7) is made of composite material, honeycomb structure, 3 cores and 2, with the middle being the honeycomb area and the surrounding area being the laminated area. The laminated areas on both sides are connected to the connecting ribs on both sides by bolts. The rear laminated area is connected to the sealing rubber parts, rubber strips and fire baffle by bolts. The bolt heads are on one side of the sealing plate and the bolt heads are sealed with fireproof sealant.

[0033] In one embodiment of the present invention, preferably, the fire baffle (3) is made of titanium alloy, is a sheet metal part, and has a minimum thickness of 0.4 mm to meet fire resistance requirements. The fire baffle extends in a similar manner to the sealing rubber part (1) in the sloping area of ​​the skin (6) on both sides, to shield and protect the gap between the skin (6) and the sealing plate (7) and the sealing rubber strip (1). Furthermore, the outer side of the fire baffle is coated with fire-retardant paint to delay heat conduction.

[0034] In one embodiment of the present invention, preferably, the rubber strip (2) is made of aluminum alloy and is a sheet metal part. It is installed on the inside of the sealing rubber part and extends in the sloping area of ​​the skin (6) on both sides in a similar manner to the sealing rubber part (1).

[0035] In one embodiment of the present invention, preferably, in order to prevent heat from being conducted to the interior through the bolts connecting the sealing rubber part (1) and the sealing plate (7) and causing the internal sealant to ignite, the connecting bolts are not wet-assembled, the inner support plate nut is not sealed, the mating surface (including the mating surface between the support plate nut and the rubber strip) is not sealed, and the outer bolt head is sealed.

[0036] The disassembled fireproof structure with gaps forms a structure like Figure 1 As shown, it includes a sealing rubber component (1), a rubber strip (2), a fire baffle (3), a stop block (4), connecting ribs on both sides (5), a skin (6), and a sealing plate (7).

[0037] The sealing rubber component (1) is made of fireproof rubber with a herringbone cross-section. The lower part is a connecting handle that is connected to the detachable sealing plate. The upper inner and outer vertical edges are sealing edges used to seal the gap between the skin and the sealing plate. Both sealing edges and the connecting handle are wrapped with a layer of glass fabric on the outside and a layer of glass fabric embedded inside, with a minimum thickness of more than 2mm.

[0038] The rubber pressure strip (2) is made of aluminum alloy, sheet metal, L-shaped, with the bottom edge connected to the rubber part, and a width of 13~16mm. The width and length of the vertical edge are adjusted according to the size of the rubber part. The edge of the vertical edge is pressed against the vertical edge of the inner side of the sealing rubber part.

[0039] The fire baffle (3) is made of titanium alloy, sheet metal, L-shaped, with its bottom edge connected to the sealing plate and connected to the rubber parts and rubber strips. Its vertical edge is on the outside of the sealing rubber parts to shield and protect them.

[0040] Rubber parts (1), rubber strips (2), and fire baffles (3) are connected to the sealing plate by bolts, nuts, and washers. The bolts are convex head bolts made of titanium alloy or steel. The bolt heads are on the outside of the fire baffles and are sealed with fireproof sealant.

[0041] The stop block (4) is an aluminum alloy machined corner box, which is connected to the connecting ribs on both sides by fasteners to seal the gaps in the sloping areas on both sides of the skin.

[0042] The connecting ribs on both sides (5) are machined aluminum alloy ribs, machined on one side. The connecting ribs on both sides are the internal skeleton, connecting the skin and sealing plate.

[0043] The skin (6) is made of composite material with a honeycomb structure, 3 cores and 3 cells. The middle part is a honeycomb area, and the surrounding area is a laminated area. The laminated areas on both sides are connected to the connecting ribs on both sides with fasteners.

[0044] The sealing plate (7) is made of composite material with a honeycomb structure, 3 cores and 2 panels. The middle part is a honeycomb area, and the surrounding area is a laminated area. The laminated areas on both sides are connected to the connecting ribs on both sides with bolts. The laminated area on the back side is connected to the sealing rubber parts, rubber strips, and fire baffle with bolts. The bolt heads are on one side of the sealing plate and the bolt heads are sealed with fireproof sealant.

[0045] The structural connection device provided by this invention includes the following key components: 1. Sealing Rubber Components: Used to seal the gap between the skin and the sealing plate. Their design must meet the following requirements: The sealing rubber components are made of fire-retardant rubber material to ensure fire resistance; the cross-section of the sealing rubber components is herringbone-shaped, with a connecting handle at the bottom for easy connection to the sealing plate using fasteners. The vertical edges are two herringbone-shaped sealing edges, which seal the gap through the inner and outer edges to achieve fire resistance. The sealing rubber components are wrapped with a layer of glass fabric on the outside and a layer of glass fabric on the inside.

[0046] 2. Rubber Pressure Strip: Used to connect sealing rubber components. Its design features include: the rubber pressure strip is made of aluminum alloy, is a sheet metal part, and is L-shaped; the bottom edge is the connection area, pressing against the connecting handle of the sealing rubber component and installed onto the sealing plate; the vertical edge is inside the sealing rubber component, and its length and angle ensure that the edge of the vertical edge presses against the inner vertical edge of the sealing rubber component. The length extends accordingly in the sloping areas of the side skins.

[0047] 3. Fire Baffle: Used to connect and protect the sealing rubber components. Its design features include: the fire baffle is made of titanium alloy, is a sheet metal component, and is L-shaped. The bottom edge is the connection area, connecting to the sealing plate along with the sealing rubber component and rubber pressure plate; the vertical edge is on the outside of the sealing rubber component, protecting the inner sealing rubber. The length extends accordingly in the sloping areas of the side skins. 4. Stop block: Used to seal the gaps in the transition area of ​​the slope on both sides of the skin. Its design features include: the stop block is made of aluminum alloy and is a machined part; it is installed in the middle of the two vertical edges of the sealing rubber part in the slope area of ​​the skin on both sides to seal the gaps in the slope area. 5. Side connecting ribs: Used to connect the skin and sealing plate. Its design features include: the side connecting ribs are made of aluminum alloy and are single-sided machined ribs; the upper vertical edge is used to connect the skin, and the lower vertical edge is used to connect the sealing plate.

[0048] 6. Skin: Its design features include: the material is a composite material, honeycomb structure, with a honeycomb area in the middle and a laminated area around it, and a sloping transition area around the honeycomb area; the laminated areas on both sides are connected to the connecting ribs on both sides.

[0049] 7. Sealing plate: Its design features include: the material is a composite material with a honeycomb structure, the middle is a honeycomb area, the surrounding area is a laminated area, and the surrounding area of ​​the honeycomb area is a sloping transition area; the laminated areas on both sides are connected to the connecting ribs on both sides, and the laminated area on the rear side is connected to the sealing rubber parts, rubber pressure strips, and fire baffle.

[0050] The above detailed embodiments are a description of the present invention. It should not be considered that the specific embodiments of the present invention are limited to these descriptions. For those skilled in the art, several simple deductions and substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the protection scope of the present invention.

Claims

1. A detachable gap fireproof structure, characterized in that, It includes a sealing rubber strip, a rubber pressure strip, a fire baffle, a stop block, a connecting rib, a skin, and a sealing plate. The sealing rubber strip has a herringbone structure with a connecting handle at the bottom. The lower surface of the connecting handle is in contact with the inner surface of the sealing plate. The bottom edge A of the fire baffle is in contact with the outer surface of the sealing plate, while the vertical edge A of the fire baffle is in contact with the outer surface of the outer sealing edge of the sealing rubber strip. The bottom edge B of the rubber pressure strip is in contact with the upper surface of the connecting handle, and the vertical edge B of the rubber pressure strip is in contact with the outer surface of the inner sealing edge of the sealing rubber strip. Bolts pass through the bottom edge A, the sealing plate, the connecting handle, and the bottom edge B in sequence, and are fixed with nuts to form a detachable sealing structure. The two sides of the skin are fixed to the connecting ribs with high-strength bolts. The two sides of the sealing plate along the flight direction are fixed to the two connecting ribs with bolts and support plate nuts.

2. The fireproof structure as described in claim 1, characterized in that, The sealing rubber parts are made of fire-retardant rubber. The outer layer of the sealing rubber parts is wrapped with a layer of glass fabric, and the inner layer is embedded with another layer of glass fabric, forming a 3-layer fabric. The inner and outer sealing edges and the mounting handle are all made of 3 layers of glass fabric. The thickness of a single rubber layer is at least 2mm.

3. The fireproof structure as described in claim 1, characterized in that, The sealing rubber strip has extension edges on both the outer and inner sealing edges. The function of the extension edges is to seal the gap between the honeycomb slope area on both sides of the skin and the sealing plate.

4. The fireproof structure as described in claim 1, characterized in that, It also includes a stop block, which is a machined corner box that is fastened to the connecting rib and forms a labyrinthine loop with the sealing edge of the sealing rubber strip to seal the gaps in the sloping areas on both sides of the skin.

5. The fireproof structure as described in claim 1, characterized in that, The stop block is made of aluminum alloy.

6. The fireproof structure as described in claim 1, characterized in that, The skin adopts a composite honeycomb structure, with a honeycomb area in the middle and a laminated area around it. The laminated areas on both sides are connected to the connecting ribs on both sides with fasteners.

7. The fireproof structure as described in claim 1, characterized in that, The sealing plate is made of composite material with a honeycomb structure. The middle part is a honeycomb area, and the surrounding parts are laminated areas. The laminated areas on both sides are connected to the connecting ribs on both sides with bolts. The laminated area on the back side is connected to the sealing rubber parts, rubber pressure strips, and fire baffle with bolts. The bolt heads are on one side of the sealing plate and are sealed with fireproof sealant.

8. The fireproof structure as described in claim 1, characterized in that, The fire baffle is made of titanium alloy and is a sheet metal part with a minimum thickness of 0.4mm. The fire baffle extends along the sloping areas of the skin on both sides and the sealing rubber parts to cover and protect the gaps between the skin and the sealing plate and the sealing rubber strip.

9. The fireproof structure as described in claim 1, characterized in that, The rubber pressure strip is made of aluminum alloy and is a sheet metal part. It is installed inside the sealing rubber part and extends with the sealing rubber part in the sloping area of ​​the skin on both sides.

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