Fuel tank flame suppressor of civil aircraft

Abstract

The utility model discloses a fuel tank flame suppressor of a civil aircraft, and relates to the technical field of flame suppressors. The fire-retardant valve comprises a shell, a positive pressure valve assembly, a negative pressure valve assembly and a fire-retardant core located in the shell. When external flames spread to the ventilation opening, the oil tank can effectively restrain the flames from spreading into the oil tank.

Description

Technical Field

[0001] The utility model relates to the technical field of flame arresters, and more specifically to a fuel tank flame arrester for civil aircraft. Background Art

[0002] The aircraft's ventilation tank is in contact with the outside air. When there is a combustion condition outside, the flame may enter the tank through the tank vent and cause the fuel to explode.

[0003] The fuel tank is a storage device for aircraft fuel. Once the fuel inside explodes, the safety of the entire aircraft will be affected.

[0004] Therefore, it is necessary to develop a fuel tank flame arrester that can suppress the flame from propagating into the fuel tank within a certain period of time and cannot affect the air intake and oil overflow functions of the fuel tank. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the above-mentioned background technology and to provide a fuel tank flame arrester for civil aircraft.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the utility model is: a fuel tank flame arrester for a civil aircraft, characterized in that it includes a shell, a positive pressure valve assembly located on one side of the shell, a negative pressure valve assembly located on the other side of the shell, and a flame arrester core located in the shell.

[0007] In the above technical solution, the positive pressure valve assembly is installed on the positive pressure valve plate positioner on the shell, the positive pressure valve plate is located in the shell, one end of the positive pressure valve plate is located outside the positive pressure valve plate positioner, and the other end passes through the positive pressure valve plate positioner, the positive pressure spring positioner connecting the shell and the positive pressure valve plate, and the positive pressure spring is mounted on the positive pressure spring positioner.

[0008] In the above technical solution, the negative pressure valve assembly includes a negative pressure valve plate positioner on the shell, a negative pressure valve plate with one end in contact with the shell and the other end passing through the negative pressure valve plate positioner, and a negative pressure spring mounted on the negative pressure valve plate.

[0009] In the above technical solution, the fire-blocking core is a metal block with a grid-like structure.

[0010] In the above technical solution, the positive pressure valve plate positioner is fixed to the housing by screws or rivets.

[0011] In the above technical solution, the negative pressure valve plate positioner is fixed to the housing by screws or rivets.

[0012] In the above technical solution, the bottom of the shell is a flange plate for installation and connection with the oil tank, and the shell is a hollow structure.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] 1) When the external flame propagates to the vent, the utility model can effectively suppress the flame from propagating into the fuel tank.

[0015] 2) In the case that the fire-blocking core of the utility model is blocked, the valve plates on both sides can open and close to ensure the air intake and oil overflow functions of the oil tank.

[0016] 3) The utility model can be conveniently installed and disassembled at the vent position of the oil tank.

[0017] 4) The fire-blocking core of the utility model is a metal block with a grid-like structure, which has the functions of dispersing heat and inhibiting the spread of flames, and allows air and fuel to flow smoothly.

[0018] 5) The utility model meets the airworthiness requirements, has a simple and reliable structure, strong practicality, complete functions, and is easy to use and promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model.

[0020] Figure 2 It is a top view of the utility model.

[0021] Among them, 1-shell, 11-flange, 2-positive pressure valve assembly, 21-positive pressure valve plate positioner, 22-positive pressure valve plate, 23-positive pressure spring positioner, 24-positive pressure spring, 3-negative pressure valve assembly, 31-negative pressure valve plate positioner, 32-negative pressure valve plate, 33-negative pressure spring, 4-fire arrester core. DETAILED DESCRIPTION

[0022] The following is a detailed description of the implementation of the utility model in conjunction with the accompanying drawings, but they do not constitute a limitation of the utility model and are only used as examples. At the same time, the advantages of the utility model will become clearer and easier to understand through the description.

[0023] Referring to the attached drawings, it can be seen that a fuel tank flame arrester for a civil aircraft is characterized by comprising a shell 1, a positive pressure valve assembly 2 located on one side of the shell 1, a negative pressure valve assembly 3 located on the other side of the shell 1, and a flame arrester core 4 located in the shell 1.

[0024] The positive pressure valve assembly 2 is installed on the positive pressure valve plate positioner 21 on the shell 1, and the positive pressure valve plate 22 is located in the shell 1, one end of which is located outside the positive pressure valve plate positioner 21, and the other end of which passes through the positive pressure valve plate positioner 21, the shell 1 and the positive pressure valve plate 22 to connect the positive pressure spring positioner 23, and the positive pressure spring 24 is sleeved on the positive pressure spring positioner 23.

[0025] The negative pressure valve assembly 3 includes a negative pressure valve plate positioner 31 on the shell 1, a negative pressure valve plate 32 whose one end contacts the shell 1 and the other end passes through the negative pressure valve plate positioner 31, and a negative pressure spring 33 mounted on the negative pressure valve plate 32; the negative pressure spring 33 is located between the negative pressure valve plate 32 and the negative pressure valve plate positioner 31.

[0026] The fire-blocking core 4 is a metal block with a grid-like structure.

[0027] The positive pressure valve plate positioner 21 is fixed to the housing 1 by screws or rivets.

[0028] The negative pressure valve plate positioner 31 is fixed to the housing 1 by screws or rivets.

[0029] The bottom of the housing 1 is a flange 11 for connection with the oil tank. The housing 1 is a hollow structure. The fire-blocking core 4 is fixed in the housing 1 by rivets.

[0030] In actual use, the functions of the positive pressure valve assembly 2 and the negative pressure valve assembly 3 are to open the positive pressure valve plate 22 to allow the oil tank to overflow when the fire arrester core 4 is blocked, and to open the negative pressure valve plate 32 to allow air to enter the oil tank. When the fire arrester core 4 is blocked, the device can ensure the air intake and oil overflow functions of the oil tank.

[0031] The flange 11 at the bottom of the shell 1 is convenient for installation and fixation on the oil tank vent; the interior of the shell 1 is hollow for installing the fire-blocking core 4 while ensuring the normal circulation of fuel and air; the holes on both sides of the shell 1 are used for installing and fixing the positive pressure valve assembly 2 and the negative pressure valve assembly 3.

[0032] The fire-blocking core 4 is a metal block with a grid-like structure, which has the functions of dispersing heat and inhibiting the spread of flames, and allows air and fuel to flow smoothly.

[0033] When the fuel pressure inside the fuel tank is greater than the external air pressure, the positive pressure valve plate 22 opens and the fuel overflows; when the fuel pressure inside the fuel tank is balanced with the external air pressure, the positive pressure valve plate 22 closes.

[0034] When the fuel pressure inside the fuel tank is lower than the external air pressure, the negative pressure valve plate 32 opens and air enters; when the fuel pressure inside the fuel tank is balanced with the external air pressure, the negative pressure valve plate 32 closes.

[0035] Other parts not described belong to the prior art.

Claims

1. A fuel tank flame arrester for a civil aircraft, characterized in that: It comprises a shell (1), a positive pressure valve assembly (2) located on one side of the shell (1), a negative pressure valve assembly (3) located on the other side of the shell (1), and a flame arrester core (4) located inside the shell (1).

2. The fuel tank flame arrester for a civil aircraft according to claim 1, characterized in that: The positive pressure valve assembly (2) is mounted on a positive pressure valve plate positioner (21) on a housing (1), a positive pressure valve plate (22) located in the housing (1), one end of which is located outside the positive pressure valve plate positioner (21) and the other end of which passes through the positive pressure valve plate positioner (21), the housing (1) and the positive pressure valve plate (22) and a positive pressure spring positioner (23) connected in sequence, and a positive pressure spring (24) mounted on the positive pressure spring positioner (23).

3. The fuel tank flame arrester for a civil aircraft according to claim 1, characterized in that: The negative pressure valve assembly (3) comprises a negative pressure valve plate positioner (31) on the housing (1), a negative pressure valve plate (32) with one end in contact with the housing (1) and the other end passing through the negative pressure valve plate positioner (31), and a negative pressure spring (33) mounted on the negative pressure valve plate (32).

4. The fuel tank flame arrester for a civil aircraft according to claim 1, characterized in that: The fire-blocking core (4) is a metal block with a grid-like structure.

5. The fuel tank flame arrester for a civil aircraft according to claim 2, characterized in that: The positive pressure valve plate positioner (21) is fixed to the housing (1) by means of screws or rivets.

6. The fuel tank flame arrester for a civil aircraft according to claim 3, characterized in that: The negative pressure valve plate positioner (31) is fixed to the housing (1) by means of screws or rivets.

7. The fuel tank flame arrester for a civil aircraft according to claim 1, characterized in that: The bottom of the housing (1) is a flange (11) for installation and connection with the oil tank, and the housing (1) is a hollow structure.

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