Quick release fire wall for aircraft

Abstract

The application provides a detachable fireproof wall of an airplane, which comprises a movable fireproof wall (1) and a fixed part (2); the movable fireproof wall (1) comprises two side panels, a profile frame (5), a belt plate (6), a T-shaped profile frame (7) and a P-shaped adhesive tape (8); the fixed part (2) comprises an L-shaped fixed fireproof wall, a right side supporting frame (10) and a left side supporting frame (11). The body is a double-layer structure, the two layers are welded together through spot welding, and a sealing frame is arranged around the periphery, so that the rigidity is very good and deformation does not occur; through reasonable design of the cooperation surface structure of the movable fireproof wall and the fixed part, the connecting points of the movable fireproof wall are only three, and all are located in the reachable area of the maintenance personnel, so that the disassembly and assembly are time-saving and convenient.

Description

Technical Field

[0001] This invention belongs to the field of aircraft structural design, and in particular relates to a quick-release firewall for aircraft. Background Technology

[0002] The helicopter engine compartment is a fire zone and must be isolated from other equipment compartments by designing firewalls. The firewalls need to meet severe requirements such as fire resistance and high temperature resistance. Since the engine has components such as lubricating oil lines, fuel lines, and mounting joints, it needs to be maintained and inspected regularly. In order to obtain sufficient maintenance space, the firewalls usually need to be designed to be removable.

[0003] Currently, most detachable firewalls on aircraft are web-reinforced riveted structures that are then bolted to the fuselage. This type of firewall has several drawbacks: First, in order to meet fire protection requirements, the spacing between the bolts cannot be too large, which greatly increases the number of bolts and leads to a significant increase in disassembly and assembly time. In addition, many bolts are limited by maintenance space and are often difficult to access, making them impossible to disassemble or assemble. Second, the firewall itself has poor rigidity after disassembly and is prone to deformation after losing the constraints of its surroundings. Summary of the Invention

[0004] Purpose of the invention: This invention provides a quick-release firewall for aircraft. The main body has a double-layer structure, which is welded together by spot welding. The perimeter is also equipped with a sealing frame, which has excellent rigidity and will not deform. Through the reasonable design of the mating surface structure between the movable firewall and the fixed part, the connection point of the movable firewall is only 3, all of which are located in the area accessible to maintenance personnel, making disassembly and assembly time-saving and convenient.

[0005] The present invention provides a quick-release firewall for an aircraft, comprising: a movable firewall 1 and a fixed part 2; The movable firewall 1 includes: two side panels, profile frame 5, strip plate 6, T-profile frame 7, and P-type adhesive strip 8; the fixed part 2 includes: an L-shaped fixed firewall, a right support frame 10, and a left support frame 11; Multiple longitudinal or transverse reinforcing grooves protruding inward are arranged on both side panels, and the longitudinal and transverse reinforcing grooves are spot welded together at the contact point. The front, rear and lower edges of both side panels are provided with first flanges at preset angles, and profile frame 5 is welded to the first flanges on both sides. The cross section of profile frame 5 is Z-shaped. Profile frame 5 is used to clip the movable firewall 1 onto the limiting profile on the front movable fairing and the fixed firewall. A vertical second flange is provided at the upper edge of the two side panels; the strip plate 6 is riveted to the second flange on both sides, and the T-shaped frame 7 fixes two symmetrically arranged P-shaped adhesive strips 8 to the strip plate 6; the two P-shaped adhesive strips 8 are used to support the left and right movable fairing frame structures on both sides of the firewall. The upper part of the contact area between the active firewall 1 and the fixed firewall 9 is provided with an installation connector, which is connected by a quick-release pin. The movable firewall 1 has a slot 105 at the bottom and the fixed firewall 9 has a plate 93 for insertion into the slot 105. The plate 93 and the two side panels are provided with through holes for quick release pins to be inserted. The right support frame 10 and the left support frame 11 are fixed on the power platform and located on both sides of the movable firewall 1. The right support frame 10, the left support frame 11 and the top of the movable firewall 1 are all provided with through holes for quick release pins to be inserted.

[0006] Optionally, bosses are provided between both side panels and the right support frame 10 and the left support frame 11. The boss is provided with a through hole for inserting a quick-release pin; The diameter of the through holes on both side panels for inserting quick-release pins is larger than the diameter of the quick-release pins.

[0007] Optionally, a fireproof sealing cap 101 is provided at the through hole for quick-release pin insertion in the right support frame 10 or the left support frame 11. A fireproof sealing cap 101 is provided at the through hole for inserting the quick-release pin on one side panel.

[0008] Optionally, the outer surface of the strip plate 6 is fitted with the upper outer surface of the movable firewall 1, and is fixed to the upper flange of the side panels by countersunk rivets 17. The thickness of the strip plate 6 is greater than the countersunk depth of the countersunk rivets 17.

[0009] Optionally, the P-type rubber strip 8 is made of silicone rubber with added glass fiber and carbon fiber; Two P-type rubber strips 8 are respectively screwed to the two flanges on both sides of the movable firewall 1 by bolts 16; The height of bolt head 16 is less than the height of P-type rubber strip 8 after compression, to avoid interference between the fairing and bolt head 16. T-profile 7 is an aluminum alloy profile structure.

[0010] Optionally, the first flange has an inclination angle of 15°, and the outer surface of the profile frame 5 is fitted with the inner surface, which is a titanium alloy plate bending structure. The frame 5 of the profile and the two side flanges are connected by double-row staggered spot welding.

[0011] Optionally, the limiting profile includes a rear profile frame 91 and a lower profile frame 92 disposed on the fixed firewall 9; The lower profile frame 92 has a V-shaped cross section, and its outer surface fits into the outer surface of the profile frame 5. Through its cooperation with the profile frame 5, it restricts the downward movement of the movable firewall 1 in the Y and Z directions. The mating surfaces of the lower profile frame 92 and the profile frame 5 are two planes with a 30° angle between them, which achieves the effect of fireproof sealing. The rear profile frame 91 has a V-shaped cross section, and its outer surface fits into the outer surface of the profile frame 5. Through its cooperation with the profile frame 5, it restricts the rearward movement of the movable firewall 1 in the Y and X directions. The mating surfaces of the rear profile frame 91 and the profile frame 5 are two planes with a 30° angle between them, which achieves the effect of fireproof sealing.

[0012] Optionally, the right support frame 10 and the left support frame 11 are corner profiles composed of rectangular and triangular vertically connected members, with light-reducing holes.

[0013] In summary, the beneficial effects of the present invention are as follows: This invention provides a quick-release firewall for aircraft. The firewall body of this invention has a double-layer structure, which is welded together by spot welding. It is surrounded by a sealing frame, which has excellent rigidity and will not deform. Through the reasonable design of the mating surface structure between the movable firewall and the fixed part, the movable firewall has only 3 connection points, all of which are located in the area accessible to maintenance personnel, making disassembly and assembly time-saving and convenient.

[0014] 1. The connection points of the movable firewall are all designed in the upper and front open areas, making the movable firewall easy to disassemble and easy for maintenance personnel to access; 2. The active firewall has 3 fixed points, which ensures the reliability of the fixed points while minimizing the number of connection points; 3. The quick-release pin and quick-release lock connection method is more convenient than bolts for disassembly and assembly, greatly shortening the maintenance disassembly and assembly time; 4. The double-layer hollow firewall structure formed by double-layer panels has good rigidity, is not easily deformed, and has good integrity after multiple disassembly and assembly. 5. The W-shaped and T-shaped frame structure of the double-layer firewall ensures the continuity of the firewall's rigidity and avoids abrupt changes in rigidity. 6. The spot-welded structure of the firewall is lighter than the previous riveted structure; the special welding electrode can overcome the disadvantage that rivets cannot be riveted in narrow areas. 7. The lower and rear areas of the movable firewall have high temperatures. By using titanium alloy W-shaped profiles, both the high temperature resistance and fire prevention requirements can be met. 8. The W-shaped profile has two flat surfaces with a 30° angle between them, which better blocks the spread of fire and ensures the fire resistance of the firewall. 9. The compressibility of the P-type rubber strip satisfies both fireproofing requirements and compensates for manufacturing and installation errors; 10. The frame of the profile adopts double-row staggered spot welding connection, which can reduce the width of the frame connection area and reduce the weight of the connection area. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a quick-release firewall structure; Figure 2 This is a schematic diagram of the upper cross-section of the active firewall; Figure 3 This is a schematic diagram of the lower section of the active firewall; Figure 4 This is a schematic diagram of the left panel structure; Figure 5 This is a schematic diagram of the right panel structure; Figure 6 This is a schematic diagram of the fixed part of the structure; Figure 7 This is a schematic diagram of a fixed firewall structure; Figure 8 A diagram showing the installation points for the active firewall; Figure 9 This is a schematic diagram of the welding process for a double-layer panel. Figure 10 Diagram of the mating surface behind the active firewall; Figure 11 This is a connection diagram of the mating surface on the lower side of the active firewall; Figure 12 This is a schematic diagram of the connection at the top of the front end; Figure 13 This is a schematic diagram of the front-end and rear-end connection. Explanation of reference numerals in the attached figures: 1-Active Firewall; 2-Fixed part; 3-Left side panel; 4-Right side panel; 5- Profile frame; 6-With plate; 7-T profile frame; 8-P type adhesive strip; 9-Fixed firewall; 10-Right side support frame; 11-Left side support frame; 12-Quick unloading pin; 13-Quick release lock; 14-Plane; 15-Quick unloading pin; 16- Bolt; 17-Counterhead rivet; 31-Longitudinal reinforcing groove; 32-Flip-edge; 33-Flipping the edge; 41-Transverse reinforcing groove; 42-Flip-edge; 43-Flipping the edge; 51 - Solder joint; 91 - Rear profile frame; 92 - Lower profile frame; 93-Fixing pin; 101-Fireproof Sealing Cap; 102 - Boss; 103 - Boss; 104-Fireproof Sealing Cap; 105-slot. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0017] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description 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 setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0018] 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 directions or positional relationships shown in the accompanying drawings 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.

[0019] 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.

[0020] 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 the accompanying drawings and embodiments.

[0021] The quick-release firewall for aircraft provided by the present invention will be explained below with reference to the accompanying drawings.

[0022] like Figure 1-13 As shown, the present invention provides a quick-release firewall for aircraft.

[0023] The quick-release firewall consists of an active firewall 1 and a fixed part 2, such as Figure 1 The quick-release firewall is located between two engine compartments. Together with the left engine compartment's left fairing and the lower power platform, it forms the left engine compartment. Together with the right engine compartment's fairing and the lower power platform, it forms the left engine compartment. Each compartment is a sealed structure, and a fire in one compartment cannot cause a fire in the other.

[0024] The movable firewall 1 consists of a left side panel 3, a right side panel 4, a profile frame 5, a strip 6, a T-profile frame 7, and a P-type adhesive strip 8. Figure 2 , Figure 3 .

[0025] The left panel 3 is a single titanium alloy panel with longitudinal reinforcing grooves 31 and flanges 32 and 33. The reinforcing grooves 31 protrude inwards and are evenly distributed on the panel, with a height of 5mm. The flanges 32 are located on the top of the panel, turning outwards at a 90-degree angle to the panel plane. The flanges 33 are located at the front, rear, and bottom of the panel, forming a 15-degree angle with the panel plane. Figure 4 ; The right panel 4 is a single titanium alloy panel with transverse reinforcing grooves 41 and flanges 42 and 43. The reinforcing grooves 41 protrude inwards and are evenly distributed on the panel, with a height of 5mm. The flanges 42 are located on the top of the panel, turning outwards at a 90-degree angle to the panel plane. The flanges 43 are located at the front, rear, and bottom of the panel, forming a 15-degree angle with the panel plane. Figure 5 ; The left panel 3 and the right panel 4 are assembled together by spot welding. The spot welds are located at the intersection of the longitudinal and transverse reinforcing grooves, ensuring a 10mm distance between the flat surfaces of the left panel 3 and the right panel 4, forming a hollow box-shaped component; Figure 9 ; The outer surface of the strip plate 6 fits against the upper flange of the left panel 3 and right panel 4, and is connected to the upper flange of the left panel 3 and right panel 4. To avoid interference from the sealing strip, countersunk rivets 17 are used for fixing. The thickness of the strip plate 6 must be greater than the countersunk depth of the countersunk rivet 17. Figure 2 ; P-type rubber strip 8 is made of silicone rubber with added glass fiber and carbon fiber, which meets both high-temperature requirements and fire resistance requirements. The fire-resistant rubber strip has high hardness, requiring a well-designed diameter D to simultaneously meet the requirements of compression amount c and compression force F.

[0026] Two P-type rubber strips 8 are respectively screwed to the flanges 32 and 42 of the movable firewall 1 using bolts 16, as follows: Figure 2 The height of the 16-head bolt must be less than the height of the compressed P-type rubber strip to avoid interference between the fairing and the 16-head bolt. Figure 2 ; T-shaped profile 7 is an aluminum alloy profile structure, located above P-shaped adhesive strip 8, and is fixed together with the P-shaped adhesive strip. Figure 2 ; The profile frame 5 is shaped like a "Z" or W. The outer surface of the profile frame 5 fits snugly against the inner surfaces of the flanges 33 and 34, forming a titanium alloy plate bending structure. The profile's complex shape and high forming difficulty necessitate the use of TA material, which is easier to form. Due to the limited space, the profile frame 5 cannot be riveted to the flanges 33 and 34; instead, spot welding is used. To ensure connection strength and prevent weld cracking, double rows of staggered weld points 51 are employed with the flanges, guaranteeing connection strength. Figure 3 ; The left panel 3, right panel 4, profile frame 5, strip plate 6, and T-profile frame 7 are connected and fixed together by riveting and spot welding to form a hollow box-shaped firewall, which greatly improves rigidity while minimizing weight. The fixed part 2 consists of a fixed firewall 9, a right-side support frame 10, and a left-side support frame 11. The fixed firewall 9 is located at the lower and rear of the movable firewall 1, while the right-side support frame 10 and the left-side support frame 11 are distributed on both sides of the movable firewall 1. Figure 6 .

[0027] The fixed firewall 9 is designed with a rear profile frame 91, a lower profile frame 92, and a fixing pin 93, such as Figure 7 ; The lower profile frame 92 has a V-shaped section, and its outer surface fits into the outer surface of the profile frame 5. Through its cooperation with the profile frame 5, it constrains the downward movement of the movable firewall 1 in the Y and Z directions. Its mating surfaces are two planes 14 forming a 30° angle, which can effectively prevent the spread of flames and achieve a fireproof sealing effect. Figure 11 ; The rear profile frame 91 has a V-shaped cross-section, and its outer surface fits into the outer surface of the profile frame 5. Through this fit with the profile frame 5, it constrains the rearward movement of the movable firewall 1 in the Y and X directions. Its mating surfaces are two planes forming a 30° angle, effectively preventing the spread of flames and achieving a fireproof sealing effect. Figure 11 ; The right support frame 10 and the left support frame 11 are triangular structures with relief holes in the middle web and are riveted to the power platform at the bottom.

[0028] There are a total of 3 quick-uninstall links between Active Firewall 1 and Fixed Part 2: Front-end connection: Quick-release pin 12 passes through the through holes on the left support frame 11, left panel 3, right panel 4, and right support frame 10, fixing the movable firewall 1 to the left support frame 11 and right support frame 10, as shown. Figure 8 ; A fireproof sealing cap 101 is installed on the right support frame 10. A boss 102 is installed on the left panel 3, and a boss 103 is installed on the right panel 4. Bosses 102 and 103 respectively contact quick-release pins 12 to prevent the quick-release pins 12 from directly abrading the left panel 3 and right panel 4, thus avoiding damage due to the thinness of the panels. Figure 12 ; The boss 103, the right-side support frame 10, and the fireproof sealing cap 101 form a sealing structure, ensuring the fireproof sealing of the firewall to meet fire protection requirements. Figure 12 ; The quick-release pin 15 can be quickly pulled out of the firewall by pulling its upper ring, ensuring rapid disassembly of the firewall. Figure 12 ; Front-end connection: Quick-release pin 12 passes through the through holes on the left panel 3, insert plate 93, and right panel 4 to fix the movable firewall 1 to the fixed firewall 9, as shown. Figure 8 ; The insert plate 93 is fixed to the fixed firewall 9. The movable firewall 1 is designed with a slot 105, into which the insert plate 93 can be inserted. Figure 13 ; A fireproof sealing cap 104 is installed on the right panel 4 to ensure the fireproof seal of the firewall and meet fire protection requirements, such as... Figure 13 ; Backend connection: Four quick-release locks 13 connect the mounting connectors of the active firewall 1 and the fixed firewall 9, securing the active firewall 1 to the fixed firewall 9, as follows. Figure 8 .

[0029] 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 quick-release firewall for aircraft, characterized in that, include: Active firewall (1) and fixed component (2); The movable firewall (1) includes: two side panels, profile frame (5), strip plate (6), T-profile frame (7), and P-type adhesive strip (8); the fixed part (2) includes: an L-shaped fixed firewall, a right support frame (10), and a left support frame (11). On one side panel, there are multiple longitudinal reinforcing grooves protruding inward, and on the other side panel, there are multiple transverse reinforcing grooves protruding inward. The longitudinal and transverse reinforcing grooves are spot-welded together at their contact points. The front, rear and lower edges of both side panels are provided with a first flange at a preset angle, and the profile frame (5) is welded to the first flange on both sides. The cross section of the profile frame (5) is Z-shaped. The profile frame (5) is used to hold the movable firewall (1) on the limiting profile on the front movable fairing and the fixed firewall. A vertical second flange is provided at the upper edge of the two side panels; the strip plate (6) is riveted to the second flange on both sides, and the T-shaped frame (7) fixes two symmetrically arranged P-shaped rubber strips (8) on the strip plate (6); the two P-shaped rubber strips (8) are used to support the left and right movable fairing frame structures on both sides of the firewall. The contact points between the active firewall (1) and the fixed firewall (9) are provided with mounting connectors and are connected by quick-release pins; The movable firewall (1) has a slot (105) at the bottom and the fixed firewall (9) has a plate (93) for inserting into the slot (105). The plate (93) and the two side panels are provided with through holes for quick release pins to be inserted. The right support frame (10) and the left support frame (11) are fixed on the power platform and located on both sides of the movable firewall (1). The top of the right support frame (10), the left support frame (11) and the movable firewall (1) are all provided with through holes for quick release pins to be inserted.

2. The quick-release firewall for aircraft according to claim 1, characterized in that, Both side panels are provided with bosses between the right support frame (10) and the left support frame (11); The boss is provided with a through hole for inserting a quick-release pin; The diameter of the through holes on both side panels for inserting quick-release pins is larger than the diameter of the quick-release pins.

3. The quick-release firewall for aircraft according to claim 1, characterized in that, Fireproof sealing caps (101) are provided at the through holes for quick-release pins to be inserted in the right support frame (10) or the left support frame (11).

4. The quick-release firewall for aircraft according to claim 1, characterized in that, The outer surface of the strip plate (6) fits against the upper outer surface of the movable firewall (1) and is fixed together with the upper flange of the side panels by countersunk rivets (17). The thickness of the strip plate (6) is greater than the depth of the countersunk rivet (17).

5. The quick-release firewall for aircraft according to claim 1, characterized in that, P-type rubber strip (8) is silicone rubber with added glass fiber and carbon fiber inside; Two P-type rubber strips (8) are respectively screwed to the two side flanges of the movable firewall (1) by bolts (16); The height of the bolt (16) head is less than the height of the P-type rubber strip (8) after compression, to avoid interference between the fairing and the bolt (16) head; The T-shaped frame (7) is made of aluminum alloy.

6. The quick-release firewall for aircraft according to claim 1, characterized in that, The first flange has an inclination angle of 15°. The outer surface of the profile frame (5) is in contact with the inner surface, which is a titanium alloy plate bending structure. The profile frame (5) and the two side flanges are connected by double-row staggered spot welding.

7. The quick-release firewall for aircraft according to claim 1, characterized in that, The limiting profile includes a rear profile frame (91) and a lower profile frame (92) installed on the fixed firewall (9). The lower profile frame (92) has a V-shaped cross section, and its outer surface fits into the outer surface of the profile frame (5). Through its cooperation with the profile frame (5), it constrains the movement of the movable firewall (1) downward in the Y and Z directions. The mating surfaces of the lower profile frame (92) and the profile frame (5) are two planes with a 30° angle between them, which achieves the effect of fireproof sealing. The rear profile frame (91) has a V-shaped cross section, and its outer surface fits into the outer surface of the profile frame (5). Through its cooperation with the profile frame (5), it constrains the movement of the movable firewall (1) backward in the Y and X directions. The mating surfaces of the rear profile frame (91) and the profile frame (5) are two planes with a 30° angle between them, which achieves the effect of fireproof sealing.

8. The aircraft quick-release firewall according to claim 1, characterized in that, The right support frame (10) and the left support frame (11) are corner profiles composed of rectangular and triangular vertical connections, with relief holes on them.

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