Air supply buffer cavity device capable of preventing flame from burning through

Abstract

An air supply buffer cavity device capable of preventing flame burnthrough can prevent flame from invading the interior of a pipeline of an air distribution system through the air supply buffer cavity device when a main cargo hold of a cargo machine is on fire, and further prevent the interior of the main cargo hold from losing flame inclusiveness. The air supply buffer cavity device comprises a buffer cavity shell, an air supply outlet formed in the upper portion of the buffer cavity shell and an air outlet grid formed in the lower portion of the buffer cavity shell, and the connecting end of the pipeline connector penetrates through the air supply outlet to be connected with an air distribution system arranged in the buffer cavity shell in a split mode. The air outlet end enables air distributed by the air distribution system in the pipeline connector to enter a buffer cavity shell of the air supply buffer cavity device in a decelerated mode, and the air is sent out to the outside through an air outlet grille below the buffer cavity shell. According to the air supply buffer cavity device, a fire insulation piece for preventing flames from entering the air outlet end of the pipeline connector from the lower portion and the side face is arranged in a buffer cavity shell, and the side face of the fire insulation piece is fixedly installed on the inner side face of the buffer cavity shell through a fire insulation piece support.

Description

Technical Field

[0001] The utility model relates to an anti-flame burn-through air supply buffer cavity device used for preventing the main cargo hold interior from losing its tolerance to flames. Background Art

[0002] In the design change project of passenger-to-cargo conversion of civil aircraft, the main cargo compartment usually needs to verify whether the flame burn-through resistance of the main cargo compartment interior panels and their design features meet CCAR requirements in accordance with Part I II of Appendix F of CCAR-25-R4 "Test Method for Determining the Flame Burn-through Resistance of Cargo Compartment Lining".

[0003] The airworthiness requirements of Section 25.855(c).

[0004] The air vents on the ceiling of the main cargo hold interior are one of the typical design features of the ceiling. The ceiling air vents usually have a large opening area. When the flame is large, it may invade the air supply buffer cavity device and then burn through the pipeline of the air distribution system connected to the buffer cavity, causing the main cargo hold interior to lose its tolerance to flames, and eventually other key cables and systems are burned, which has a great impact on the flight safety of the aircraft. Therefore, fire protection design is the primary issue that must be faced.

[0005] In the prior art, there is known U.S. Patent No. 10252091B2, which relates to a fireproof container, including a first flame retardant layer and a second flame retardant layer connected to the first flame retardant layer, or including a reinforcing material as a flame retardant layer and a reinforcing flame retardant layer. However, the fireproof container is a flame containment structure and does not involve an aircraft ventilation system.

[0006] In addition, in the prior art, there is known Chinese invention patent application CN106477022A,

[0007] It relates to a method, system and device for installing a liner to an aircraft cargo compartment, the device including a liner having a fireproof composite layer to provide flame penetration resistance to the compartment, and having a first metal layer coupled to the fireproof composite layer to increase the structural rigidity of the fireproof composite layer so as to enhance the flame penetration resistance when the fireproof composite layer is exposed to a fire. However, the device improves the flame resistance of the cargo compartment itself and does not involve fire protection of the aircraft ventilation system.

[0008] In addition, in the prior art, there is a known Chinese invention patent CN106801980B, which relates to an air conditioning fire prevention control method and control system. When the air conditioner is running, the current power supply temperature is compared with the historical power supply temperature, and whether to execute the air conditioning fire prevention control process is determined according to the comparison result. However, the system also does not involve specific fire prevention of aircraft ventilation systems.

[0009] Finally, in the prior art, there is known Chinese utility model patent CN218348795U,

[0010] It involves the field of fire safety, and the device includes a box, a first axial flow fan, a second axial flow fan, a smoke sensor, a pressure sensor, a temperature sensor, a carbon dioxide sensor, a gas probe, an air inlet, an air outlet, a smoke inlet, a smoke exhaust outlet, a filter purifier, a main control board, a filter metal mesh and a buckle, etc. However, the device has a complex structure and is also not suitable for aircraft ventilation systems.

[0011] During the flame burn-through test of the interior decoration of a certain type of passenger-to-cargo conversion design change project, the connection section of the buffer chamber shell 110A and the pipeline of the air distribution system (see Figure 1(a)) was ignited and burned. As shown in Figure 1(b), there is no fire-blocking design inside the buffer chamber shell 110A, so that the buffer chamber shell 110A located at the air inlet 120A and the pipeline interface 140A of the air distribution system are directly exposed to the flame through the air outlet grille 130A.

[0012] However, most of the fire protection devices in the prior art have nothing to do with the fire protection of the aircraft ventilation system, and the air supply buffer cavity devices in the existing passenger aircraft cabins are all designed and improved based on the uniformity and comfort of air supply in the manned cabin, and have never involved technical content related to flame burn-through resistance.

[0013] As a result, the flame-burning resistance of the existing air supply buffer chamber device of cargo aircraft is still insufficient.

[0014] Therefore, how to design an anti-flame burn-through air supply buffer cavity device to prevent the flame from invading the air distribution system pipeline through the air supply buffer cavity device when a fire occurs in the main cargo hold of a civil cargo aircraft, causing the main cargo hold interior to lose its flame containment has become a technical problem that needs to be solved urgently. Utility Model Content

[0015] The utility model is developed to solve the defects of the above-mentioned prior art, and its purpose is to provide an air supply buffer chamber device that is flame-proof. When a fire occurs in the main cargo hold of a cargo plane, the flame can be prevented from invading the interior of the air distribution system through the air supply buffer chamber device, thereby preventing the interior of the main cargo hold from losing its tolerance to flames.

[0016] In order to achieve the above-mentioned purpose, the utility model provides an air supply buffer chamber device that is flame-proof, the air supply buffer chamber device comprising a buffer chamber shell, an air supply port formed above the buffer chamber shell and an air outlet grille formed below the buffer chamber shell, the connecting end of the pipeline interface passes through the air supply port and is connected to an air distribution system separately arranged in the buffer chamber shell, the air outlet end decelerates the air distributed by the air distribution system in the pipeline interface and enters the buffer chamber shell of the air supply buffer chamber device, and is sent to the outside through the air outlet grille below the buffer chamber shell, and is characterized in that the air supply buffer chamber device is provided with a fireproof member in the buffer chamber shell to block the flame from entering the air outlet end of the pipeline interface from the bottom and the side, and the fireproof member is fixedly installed on the inner side of the buffer chamber shell on its side by the fireproof member support.

[0017] According to the structure as described above, since the air supply buffer chamber device is provided with a fireproof member at the air outlet end of the pipeline interface inside the buffer chamber shell to block the flame from the bottom and the side, when a fire occurs in the main cargo hold of the cargo plane, the fireproof member can prevent the flame from directly invading the interior of the pipeline of the air distribution system through the air supply buffer chamber device, thereby preventing the main cargo hold interior from losing its tolerance to flames.

[0018] Preferably, the air outlet end of the pipeline interface is in the shape of a bell mouth.

[0019] According to the above-described configuration, the air in the pipe interface distributed by the air distribution system can be made to flow out to the inside of the buffer chamber housing more uniformly.

[0020] More preferably, the side surface of the fireproof member is arranged above the lowermost end of the air outlet end of the pipe interface and surrounds the air outlet end of the pipe interface. Furthermore, when a fire occurs below the buffer chamber shell, a flame propagation path from the outside of the fireproof member through the top of the fireproof member to the inside of the fireproof member avoids the air outlet end of the pipe interface.

[0021] According to the structure as described above, even if a fire occurs below the buffer chamber shell, the flame will avoid the air outlet end of the pipeline interface from both sides of the fire isolation component, forming a tortuous flame propagation path, avoiding the flame from directly entering the pipeline of the air distribution system, and playing a role in preventing flame burn-through.

[0022] In addition, preferably, both the fire insulation member support and the fire insulation member are made of fire insulation material.

[0023] According to the above-mentioned structure, it is possible to avoid the fire isolation member support being burned off by flames, which may cause the fire isolation member to become unstable or even fail to be fixed.

[0024] In addition, it is preferred that a guide plate is provided inside the buffer chamber shell below the fire isolation member.

[0025] According to the above structure, the air that becomes turbulent due to the setting of the fireproof member can be made uniform through the guide of the guide plate. In addition, by setting the guide plate, it is conducive to the uniform outflow of the air supply airflow at the outlet plane (air outlet grille) of the air supply buffer chamber device, so as to avoid the problem of excessive local flow velocity caused by airflow concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG. 1( a ) is a schematic diagram of a fire in a pipe connection section between a buffer chamber and an air distribution system.

[0027] FIG. 1( b ) shows a schematic diagram of the internal structure of the buffer cavity of FIG. 1( a ) (without fire-blocking design).

[0028] Figure 2 This is a schematic diagram showing the flame propagation when a fire occurs below the buffer chamber shell in a conventional air supply chamber buffer device.

[0029] Figure 3 It is a structural diagram showing the schematic structure of the air supply buffer chamber device for preventing flame burn-through of the utility model.

[0030] Figure 4 It is a schematic diagram showing the flame propagation when a fire occurs below the buffer chamber shell in the air supply chamber buffer device of the utility model.

[0031] Figure 5 It is a schematic diagram showing a screenshot of the buffer chamber flow field of the flame-burn-through-proof air supply buffer chamber device of the utility model.

[0032] (Explanation of symbols)

[0033] 100 (Flame-proof) air supply buffer chamber device;

[0034] 100A (previous) air supply buffer chamber device;

[0035] 110A buffer chamber housing;

[0036] 120, 120A air supply outlet;

[0037] 130, 130A air outlet grille;

[0038] 140, 140A pipeline interface;

[0039] 141 connection end;

[0040] 142 air outlet;

[0041] 150 Fireproofing;

[0042] 160 Fire barrier support;

[0043] 170 Deflector. DETAILED DESCRIPTION

[0044] Below, refer to Figures 3 to 5 , the flame-proof air supply buffer chamber device 100 of the utility model is described, wherein, Figure 3 It is a structural diagram showing the schematic structure of the air supply buffer chamber device 100 for preventing flame burn-through of the utility model. Figure 4 1 is a schematic diagram showing the flame propagation when a fire occurs below the buffer chamber housing 110 in the air supply chamber buffer device 100 of the present invention. Figure 5 It is a schematic diagram showing a screenshot of the buffer cavity flow field of the flame-burn-through-proof air supply buffer cavity device 100 of the present invention.

[0045] like Figure 3 As shown, the flame-proof air supply buffer chamber device 100 of the utility model includes a buffer chamber shell 110, an air supply port 120 formed above the buffer chamber shell 110, and an air outlet grille 130 formed below the buffer chamber shell 110. The connecting end 141 of the pipe interface 140 passes through the air supply port 120 and is connected to an air distribution system (not shown) separately arranged in the buffer chamber shell 110, and the other end is an air outlet end 142, so that the air distributed by the air distribution system in the pipe interface 140 is decelerated and enters the buffer chamber shell 110 of the air supply buffer chamber device 100, and then is sent to the outside through the air outlet grille 130 below the buffer chamber shell 110.

[0046] exist Figure 2 In the conventional air supply buffer chamber device 100A shown, when a fire occurs below the buffer chamber shell 110A, the pipe interface 140A between the buffer chamber shell 110A and the air distribution system (not shown) is directly exposed above the flame, and the flame can easily invade the pipe of the air distribution system and burn through it, thereby causing the main cargo compartment interior to lose its resistance to flames.

[0047] However, if Figure 3 As shown, the air supply buffer chamber device 100 of the utility model is provided with a fireproof member 150 in the buffer chamber shell 110 to block the flame from entering the air outlet end 142 of the pipeline interface 140 from the bottom and the side, and the fireproof member 150 is fixedly mounted on the inner side of the buffer chamber shell 110 through the fireproof member support 160 at its side, so that even if a fire occurs below the buffer chamber shell 110, the flame will not be as Figure 2 As shown, it penetrates into the pipes of the air distribution system and burns through them.

[0048] Preferably, the air outlet end 142 of the pipe interface 140 is, for example, a bell mouth, thereby

[0049] The air in the pipeline interface 140 distributed by the air distribution system can flow out to the inside of the buffer chamber housing 110 more evenly.

[0050] It is further preferred that the side of the fireproof member 150 is arranged above the lowermost end of the air outlet end 142 of the pipe interface 140 and surrounds the air outlet end 142 of the pipe interface 140, so that even if a fire occurs below the buffer chamber housing 110, Figure 4 As shown, the flame will also avoid the air outlet 142 of the pipe interface 140 from both sides of the fire isolation member 150, forming a tortuous flame propagation path, preventing the flame from directly entering the pipe of the air distribution system, and playing a role in preventing the flame from burning through.

[0051] In the present invention, it is preferred that both the fire isolation member support 160 and the fire isolation member 150 use fire isolation materials to prevent the fire isolation member support 160 from being burned by flames, which may cause the fire isolation member 150 to be unstable or even fail to be fixed.

[0052] The fire-blocking structure (fire-blocking member 150 and fire-blocking member support 160) design in the air supply buffer chamber device 100 of the utility model has little effect on the gas circulation inside the buffer chamber shell 110, and the flow resistance of the buffer chamber is reasonable, which does not affect the performance of the air distribution system.

[0053] To this end, the inventor of the present invention used CFD tools to evaluate the flow resistance inside the buffer chamber shell 110. When the inlet flow rate is given as 2.1 kg / min (the flow rate of the air distribution branch pipe of the ARJ21-700 passenger-to-cargo aircraft is used as an example for verification), the flow resistance is 2.25 mbar, which meets the requirement of the buffer chamber flow resistance of 1.6 mbar to 5.1 mbar in the technical specifications of the ventilation system of this type of aircraft. It can be judged that the buffer chamber flow resistance in the air supply buffer chamber device 100 with this type of fire barrier structure is moderate, and the design of the fire barrier structure will not affect the performance of the air distribution system.

[0054] In the air supply buffer chamber device 100 of the utility model, since the fireproof member 150 is arranged below and on the side of the air outlet end 142 of the pipeline interface 140, for example, in the form of a bell mouth, although it has a positive effect in forming a tortuous flame propagation path, preventing the flame from directly entering the pipeline of the air distribution system, and playing a role in preventing the flame from burning through, the arrangement of the fireproof member 150 has a negative impact on the uniformity of air supply. In order to eliminate or reduce the negative impact caused by the arrangement of the fireproof member 150, it is preferred that, as Figure 3 As shown, a guide plate 170 is disposed below the fire isolation member 150 inside the buffer chamber housing 110 so that the air that becomes turbulent due to the setting of the fire isolation member 150 can be made uniform through the guidance of the guide plate 170 .

[0055] The screenshot of the flow field of the buffer chamber of the air supply buffer chamber device 100 for preventing flame burn-through of the utility model is as follows: Figure 5 As shown, it can be seen that by providing the guide plate 170, it is beneficial for the supply air flow to flow evenly at the outlet plane (the air outlet grille 130) of the air supply buffer chamber device 100, so as to avoid the problem of excessive local flow velocity caused by concentrated airflow.

[0056] Those skilled in the art will readily appreciate other advantages and modifications. Therefore, in its broader sense, the utility model is not limited to the specific details and representative embodiments shown and described herein. Therefore, modifications may be made without departing from the spirit or scope of the overall inventive concept as defined by the appended claims and their equivalents.

Claims

1. An air supply buffer chamber device that is flame-proof, the air supply buffer chamber device (100) comprising a buffer chamber shell (110), an air supply port (120) formed above the buffer chamber shell (110), and an air outlet grille (130) formed below the buffer chamber shell (110); a connecting end (141) of a pipe interface (140) passes through the air supply port (120) and is connected to an air distribution system that is separately arranged in the buffer chamber shell (110); an air outlet end (142) decelerates the air in the pipe interface (140) distributed by the air distribution system and enters the buffer chamber shell (110) of the air supply buffer chamber device (100), and is then sent to the outside through the air outlet grille (130) below the buffer chamber shell (110); It is characterized in that The air supply buffer chamber device (100) is provided with a fireproof member (150) in the buffer chamber shell (110) for blocking flames from entering the air outlet end (142) of the pipe interface (140) from below and from the side, and the fireproof member (150) is fixedly mounted on the inner side surface of the buffer chamber shell (110) via a fireproof member support (160) on its side.

2. The flame-proof air supply buffer chamber device according to claim 1, characterized in that: The air outlet end (142) of the pipeline interface (140) is in the form of a bell mouth.

3. The flame-proof air supply buffer chamber device according to claim 2, characterized in that: The side surface of the fireproof member (150) is arranged above the lowermost end of the air outlet end (142) of the pipe interface (140), and surrounds the air outlet end (142) of the pipe interface (140).

4. The flame-proof air supply buffer chamber device according to claim 3, characterized in that: A fire starts below the buffer chamber shell (110), and a flame propagation path is formed from the outside of the fireproof member through the top of the fireproof member to the inside of the fireproof member, avoiding the air outlet end (142) of the pipe interface (140).

5. The flame-proof air supply buffer chamber device according to claim 1, characterized in that: The fireproofing member support (160) and the fireproofing member (150) are both made of fireproofing materials.

6. The flame-proof air supply buffer chamber device according to any one of claims 1 to 5, characterized in that: A guide plate (170) is arranged inside the buffer chamber housing (110) and below the fire isolation member (150).

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