Binding post fireproof structure for composite material firewall

Abstract

The binding post fireproof structure comprises the composite material firewall, a binding post, fireproof cotton and a stainless steel plate, the fireproof cotton and the stainless steel plate are located at one end of the composite material firewall, a metal coil is arranged at the other end of the composite material firewall, and a flange section is arranged on the outer side of the binding post. The binding post penetrates through the stainless steel plate, the fireproof cotton, the composite firewall and the metal coil, the flange section abuts against the stainless steel plate, the binding post is sleeved with a lining, a first lug plate and a second lug plate, the lining is located between the second lug plate and the metal coil, and the first lug plate is located on one side of the flange section. Fireproof sealants are arranged between the binding post and the lining, between the composite firewall, the fireproof cotton and the metal coil and between the metal coil and the composite firewall, and the fireproof structure can meet the fireproof requirement of the existing CCAR-23 airworthiness regulations on the firewall and can prevent smoke from entering a cabin.

Description

Technical Field

[0001] The utility model belongs to the technical field of fireproof structures, and in particular relates to a fireproof structure of a terminal post used for a composite material fire wall. Background Art

[0002] Aircraft with engines installed in front of the cockpit usually have a firewall between the engine compartment and the cockpit. Its purpose is to ensure that after a fire in the engine compartment, the fire will not penetrate within a specified time. For metal aircraft, the use of materials such as stainless steel plates and monel alloys can solve the fire prevention problem of the firewall. For composite aircraft, since composite firewalls cannot withstand the temperature of flames, the fire prevention design of composite firewalls is particularly important. The terminal posts that penetrate the composite firewall must not only consider fire resistance, but also its wall-penetrating sealing to ensure that after a fire in the engine compartment, smoke will not enter the cockpit through the wall-penetrating parts and affect the safety of the pilot. Utility Model Content

[0003] The purpose of the utility model is to solve the problems in the background technology and to provide a fireproof structure of a terminal post used in a composite fire wall.

[0004] To achieve the above-mentioned purpose, the utility model proposes a fireproof structure of a terminal post for a composite fire wall, comprising a composite fire wall, a terminal post, fireproof cotton and a stainless steel plate, wherein the fireproof cotton and the stainless steel plate are located at one end of the composite fire wall, and a metal coil is provided at the other end of the composite fire wall. A flange section is provided on the outside of the terminal post, and the terminal post passes through the stainless steel plate, the fireproof cotton, the composite fire wall and the metal coil, and the flange section abuts against the stainless steel plate. A bushing, a first terminal piece and a second terminal piece are sleeved on the outside of the terminal post, the bushing is located between the second terminal piece and the metal coil, and the first terminal piece is located on one side of the flange section. Fireproof sealant is provided between the terminal post and the bushing, the composite fire wall, the fireproof cotton and the metal coil, and between the metal coil and the composite fire wall.

[0005] Preferably, both ends of the terminal are provided with threads, the first terminal piece is sleeved on the outside of the terminal and pressed against the flange section with nuts and washers, and the second terminal piece is sleeved on the outside of the terminal and pressed against the bushing with nuts and washers.

[0006] Preferably, the outer side of the flange segment is coated with a heat-insulating sealant to seal the gap between the outer edge of the flange segment and the stainless steel plate.

[0007] Preferably, the terminal is made of stainless steel.

[0008] Preferably, the second terminal lug is used to overlap the negative ground, shielding ground and lightning protection ground of the equipment on the aircraft cabin side, and the overlapping resistance value of the terminal and the stainless steel plate after being connected does not exceed 2.5 milliohms.

[0009] Preferably, the stainless steel plate has a thickness of 0.015 inches to 0.017 inches.

[0010] Preferably, the thickness of the fireproof cotton is 0.120 inches to 0.130 inches.

[0011] The beneficial effects of the utility model are as follows: the terminal penetrates the composite firewall, and the gaps between the terminal and the composite firewall, fireproof cotton, and metal coil are sealed by fireproof sealant. The composite firewall is provided with fireproof cotton. The fireproof structure can meet the fireproof requirements of the existing CCAR-23 airworthiness regulations for firewalls and can prevent smoke from entering the cockpit.

[0012] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0014] Figure 2 It is a wiring diagram of a lap resistance value test according to an embodiment of the present utility model.

[0015] In the figure: 1-composite fire wall, 2-terminal, 3-fireproof cotton, 4-stainless steel plate, 5-metal coil, 6-bushing, 7-second terminal, 8-first terminal, 9-fireproof sealant, 10-microohmmeter, 21-flange section, 22-thermal insulation sealant. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical scheme and advantages of the embodiment of the present application clearer, the technical scheme in the embodiment of the present application will be clearly and completely described in conjunction with the drawings in the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, not all of the embodiments. The components of the embodiment of the present application described and shown in the drawings here can be arranged and designed in various different configurations. In the description of the present application, it should be noted that the orientation or position relationship indicated by the terms "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship usually placed when the application product is used, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0017] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0018] The utility model is described in detail below in conjunction with the accompanying drawings.

[0019] See also Figure 1 The present embodiment provides a terminal post fireproof structure for a composite fire wall, comprising a composite fire wall 1, a terminal post 2, fireproof cotton 3 and a stainless steel plate 4, wherein the fireproof cotton 4 and the stainless steel plate 4 are located at one end of the composite fire wall 1, and a metal coil 5 is provided at the other end of the composite fire wall 1. A flange section 21 is provided on the outside of the terminal post 2, and the terminal post 2 passes through the stainless steel plate 4, the fireproof cotton 3, the composite fire wall 1 and the metal coil 5, and the flange section 21 abuts against the stainless steel plate 4. A bushing 6, a first terminal piece 8 and a second terminal piece 7 are sleeved on the outside of the terminal post 2, the bushing 6 is located between the second terminal piece 7 and the metal coil 5, the first terminal piece 8 and the stainless steel plate 4 are respectively located on both sides of the flange section 21, and fireproof sealant 9 is provided between the terminal post 2 and the bushing 6, between the terminal post 2 and the composite fire wall 1, between the terminal post 2 and the fireproof cotton 3, between the terminal post 2 and the metal coil 5, and between the metal coil 5 and the composite fire wall 1.

[0020] Among them, the stainless steel plate 4 is close to the aircraft engine compartment side, the stainless steel plate 4 can withstand high temperatures and can withstand direct contact with flames; the composite firewall 1 is integrally formed with the aircraft fuselage; the fireproof sealant 9 can withstand high temperatures up to 1093 degrees Celsius, and is used to isolate the high temperature of the terminal 2, so that the high temperature of the terminal 2 will not damage the composite firewall 1; the terminal 2 is used to connect the negative ground, shielding ground and lightning protection ground of the equipment on the cockpit side with the engine ground and engine bracket on the engine compartment side, and the two sides of the composite firewall 1 are the cockpit and the engine compartment respectively; the fireproof sealant 9 located between the terminal 2 and the bushing 6 adopts a rounded corner sealing method to further prevent smoke from entering the aircraft cabin through the gap.

[0021] As an implementation method of the embodiment, both ends of the terminal 2 are provided with threads. After the first terminal plate 8 is mounted on the outside of the terminal 2, it is pressed against the flange section 21 with nuts and gaskets. After the second terminal plate 7 is mounted on the outside of the terminal 2, it is pressed against the bushing 6 with nuts and gaskets.

[0022] As an implementation method of the embodiment, the outer side of the flange section 21 is coated with an insulating sealant 22 to seal the gap between the outer edge of the end of the flange section 21 and the stainless steel plate 4. The insulating sealant 22 adopts a rounded corner sealing method to further prevent smoke from entering the aircraft cabin through the gap.

[0023] As an implementation of the embodiment, the terminal 2 is made of stainless steel.

[0024] As an implementation method of the embodiment, the second wiring plate 7 is used to overlap the negative ground, shielding ground and lightning protection ground of the equipment on the aircraft cabin side, so as to facilitate the common ground of the negative ground, shielding ground and lightning protection ground of the equipment on the cabin side with the engine and the engine bracket. The overlapping resistance value of the terminal 2 and the stainless steel plate 4 after being connected does not exceed 2.5 milliohms.

[0025] The lap resistance value between the stainless steel plate 4 and the terminal 2 is measured by the micro-ohmmeter 10 using a four-wire system. The lap resistance value between the second terminal piece 7 and the terminal 2 is measured by the micro-ohmmeter 10 using a four-wire system. The four-wire connection method of the micro-ohmmeter 10 during measurement is shown in FIG. Figure 2 , Figure 2 In the figure, Ⅰ and Ⅴ represent the wires connected to the micro-ohmmeter.

[0026] As an implementation of the embodiment, the thickness of the stainless steel plate 4 is 0.015 inches to 0.017 inches. Preferably, the thickness of the stainless steel plate 4 is 0.016 inches.

[0027] As an implementation of the embodiment, the thickness of the fireproof cotton 3 is 0.120 inches to 0.130 inches. Preferably, the thickness of the fireproof cotton 3 is 0.125 inches, and the fireproof cotton 3 can withstand a high temperature of up to 1793 degrees Celsius.

[0028] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the protection scope of the present invention.

Claims

1. A fireproof structure of a terminal post for a composite fire wall, characterized in that: It includes a composite fire wall, a terminal, fireproof cotton and a stainless steel plate, wherein the fireproof cotton and the stainless steel plate are located at one end of the composite fire wall, a metal coil is provided at the other end of the composite fire wall, a flange section is provided on the outside of the terminal, the terminal passes through the stainless steel plate, the fireproof cotton, the composite fire wall and the metal coil, the flange section abuts against the stainless steel plate, a bushing, a first terminal plate and a second terminal plate are sleeved on the outside of the terminal, the bushing is located between the second terminal plate and the metal coil, the first terminal plate is located on one side of the flange section, and fireproof sealant is provided between the terminal and the bushing, the composite fire wall, the fireproof cotton and the metal coil, and between the metal coil and the composite fire wall.

2. The fireproof structure of the terminal post for composite fire wall according to claim 1, characterized in that: Both ends of the terminal are provided with threads. After the first terminal piece is sleeved on the outside of the terminal piece, it is pressed against the flange section with nuts and washers. After the second terminal piece is sleeved on the outside of the terminal piece, it is pressed against the bushing with nuts and washers.

3. The fireproof structure of the terminal post for composite fire wall according to claim 1, characterized in that: The outer side of the flange section is coated with heat-insulating sealant to seal the gap between the outer edge of the flange section and the stainless steel plate.

4. The fireproof structure of the terminal post for composite fire wall according to claim 1, characterized in that: The terminal is made of stainless steel.

5. The terminal post fireproof structure for composite fire wall according to claim 1, characterized in that: The second connecting piece is used to connect the negative ground, shielding ground and lightning protection ground of the equipment on the aircraft cabin side together, and the connection resistance value of the connecting post and the stainless steel plate after connection does not exceed 2.5 milliohms.

6. The fireproof structure of the terminal post for composite fire wall according to claim 1, characterized in that: The thickness of the stainless steel plate is 0.015 inch to 0.017 inch.

7. The fireproof structure of the terminal post for composite fire wall according to claim 1, characterized in that: The thickness of the fireproof cotton is 0.120 inches to 0.130 inches.

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