Airplane fuel tank vent system

Abstract

An aircraft fuel tank vent system is provided to simplify the system structure, reduce the system weight, and improve the system reliability. The aircraft fuel tank vent system includes a first left vent line and a first right vent line that communicate a center wing fuel tank with left and right wing vent fuel tanks. The center wing fuel tank is divided into a left side region, a center region, and a right side region by two semi-sealing ribs. The first left vent line has a first vent port at a left side in the center region, a third vent port at a rear side in the left side region, and a fifth vent port at a front side in the left side region and formed by an opening. The first right vent line is asymmetric relative to the first left vent line and has a second vent port at a right side in the center region, a fourth vent port at a rear side in the right side region, and a sixth vent port at a front side in the right side region and formed by an opening. The first vent port is at a rear side in the center region, and the second vent port is at a front side in the center region.

Description

Technical Field

[0001] This utility model relates to an aircraft fuel tank venting system. Background Technology

[0002] Currently, in civil mainline aircraft, the ventilation methods for the center wing fuel tank include cross ventilation layout, single-sided ventilation layout, and "π" shaped layout.

[0003] In the cross-ventilation layout, the vent is located on the left side of the interior of the central wing fuel tank and is connected to the right wing ventilation fuel tank via a ventilation path. The vent is located on the right side of the interior of the central fuel tank and is connected to the left wing ventilation fuel tank via a ventilation path. These two ventilation paths are not directly connected and are arranged in a cross pattern in the central fuel tank.

[0004] In a single-sided ventilation configuration, the central wing fuel tank is connected to the left wing ventilation fuel tank only via a ventilation pipe.

[0005] In the "π" shaped layout, the ventilation ducts of the center wing fuel tank are symmetrically arranged with the centerline of the aircraft as the boundary, and the main ventilation ducts span the left and right wings of the aircraft.

[0006] In the above-mentioned cross-ventilation layout, long duct ventilation is generally used, which makes the system layout somewhat difficult; on the other hand, if pipes are used instead of ventilation ducts, the system weight will be greater.

[0007] In the above-mentioned single-sided ventilation layout, in order to avoid single-point failure, it is necessary to use multiple pressure relief valves on the lower wall plate of the oil tank and the sealing rib plate, which can easily lead to system structure complexity.

[0008] In the aforementioned "π"-shaped layout, the left and right vent pipes in the central wing fuel tank extend from the front of the fuel tank, close to the centerline of the aircraft, to the left and right, and then to the rear. The overall length is very long, resulting in a large system weight. Utility Model Content

[0009] This invention was made in view of the above-mentioned problems, and its purpose is to provide an aircraft fuel tank venting system that helps to simplify the system structure, reduce the system weight, and improve the system reliability.

[0010] To achieve the above objectives, this utility model provides an aircraft fuel tank venting system. The aircraft fuel tank includes: a center wing fuel tank; and a left wing venting fuel tank and a right wing venting fuel tank located on the left and right sides of the center wing fuel tank. The system includes: a first left-side venting duct connecting the center wing fuel tank and the left wing venting fuel tank; and a first right-side venting duct independent of the first left-side venting duct and connecting the center wing fuel tank and the right wing venting fuel tank. The interior of the center wing fuel tank is divided into a left-side region, a central region, and a right-side region by two semi-sealed ribs. The first left-side venting duct has a position located on the left side of the central region and... The first right-side vent is asymmetrical relative to the first left-side vent and has the following features: a first vent located at the top; a third vent located at the rear and top of the left-side region; and a fifth vent located at the front and top of the left-side region, which is an open opening. The first right-side vent is located at the top and top of the right-side region; a fourth vent located at the rear and top of the right-side region; and a sixth vent located at the front and top of the right-side region, which is an open opening. One of the first vent and the second vent is located at the rear of the central region, and the other is located at the front of the central region.

[0011] According to the aircraft fuel tank venting system of this utility model, the first left-side venting pipe connecting the center wing fuel tank and the left wing venting fuel tank extends from the first vent on the left side of the central region of the center wing fuel tank towards the left, and the first right-side venting pipe connecting the center wing fuel tank and the right wing venting fuel tank extends from the second vent on the right side of the central region of the center wing fuel tank towards the right. There is no need for them to cross each other, and the first left-side and first right-side venting pipes are asymmetrical. Therefore, this helps to shorten the length of the first left-side and first right-side venting pipes, simplify the system structure, reduce the system weight, and also helps to reduce the installation work of the venting system, lower operating costs, and improve the maintainability of the venting system. Furthermore, multiple vents are provided at multiple positions in front, behind, left, and right of the center wing fuel tank, thus helping to achieve effective communication between the center wing fuel tank and the outside atmosphere under various aircraft attitudes, improving system reliability. Moreover, the fifth and sixth vents are open, i.e., open to the atmosphere, thus effectively preventing pressure buildup and fuel spillage, further improving system reliability.

[0012] Furthermore, in the aircraft fuel tank venting system of this utility model, the third vent and the fifth vent are preferably located on the left side of the left-side region, and the fourth vent and the sixth vent are located on the right side of the right-side region.

[0013] According to the aircraft fuel tank ventilation system of this utility model, the first vent, the second vent, the third vent, the fourth vent, the fifth vent, and the sixth vent are distributed near the boundary and corners of the center wing fuel tank, which helps to match with the aircraft's inerting system and achieve a better inerting effect for the center wing fuel tank.

[0014] Furthermore, in the aircraft fuel tank venting system of this utility model, the aircraft fuel tank preferably further includes: a left-wing fuel tank located between the center wing fuel tank and the left-wing venting fuel tank; and a right-wing fuel tank located between the center wing fuel tank and the right-wing venting fuel tank. The interior of the left-wing fuel tank is divided into a left-side region, a central region, and a right-side region by two semi-sealed ribs. It also includes: a second left-side venting duct, which is independent of the first left-side venting duct and connects the left-wing fuel tank to the left-wing venting fuel tank; and a second right-side venting duct, which is independent of the first right-side venting duct and connects the right-wing fuel tank to the right-wing venting fuel tank. The second left-side venting duct has: located between the center wing fuel tank and the right-wing venting fuel tank. The right wing fuel tank has a seventh vent located at the front and top of the central area of ​​the wing fuel tank and is open; and an eighth vent located at the front and top of the left side of the left wing fuel tank. The interior of the right wing fuel tank is divided into a left side area, a central area, and a right side area by two semi-sealed ribs. The second right-side vent pipe has a tenth vent located at the front and top of the central area of ​​the right wing fuel tank and is open; and an eleventh vent located at the front and top of the right side area. A ninth vent is provided through the partition wall between the left wing fuel tank and the left wing vent fuel tank, and a twelfth vent is provided through the partition wall between the right wing fuel tank and the right wing vent fuel tank.

[0015] According to the aircraft fuel tank ventilation system of this utility model, in addition to the first, second, third, fourth, fifth, and sixth ventilation ports located in the center wing fuel tank, a seventh, eighth, tenth, eleventh, ninth, and twelfth ventilation ports are also provided in the left wing fuel tank, the right wing fuel tank, the partition wall between the left wing fuel tank and the left wing ventilation fuel tank, and the partition wall between the right wing fuel tank and the right wing ventilation fuel tank. Therefore, it helps to achieve effective communication between the left wing fuel tank and the outside atmosphere in various aircraft attitudes, thereby improving system reliability. In particular, the seventh and tenth ventilation ports are open, thus reducing the damage caused by the failure of the float valve in the ninth and twelfth ventilation ports to the closed position when the float valve is installed (loss of ventilation capability of the left and right wing fuel tanks).

[0016] Furthermore, in the aircraft fuel tank ventilation system of this utility model, the central region is preferably divided into a front region and a rear region by a spanwise beam, the first vent is located in one of the front region and the rear region, and the second vent is located in the other of the front region and the rear region.

[0017] According to the aircraft fuel tank ventilation system of this utility model, by setting the first vent and the second vent in two areas separated by the spanwise beam, cross-flow of air in the left and right vent pipes can be avoided.

[0018] Furthermore, in the aircraft fuel tank venting system of this utility model, it is preferable to provide venting float valves at the first vent, the second vent, the third vent, and the fourth vent.

[0019] According to the aircraft fuel tank venting system of this utility model, by setting venting float valves at the first vent, second vent, third vent and fourth vent respectively, fuel spillage can be prevented when the aircraft is in a specific flight state.

[0020] Furthermore, in the aircraft fuel tank venting system of this utility model, it is preferable to provide venting float valves at the eighth vent, the ninth vent, the eleventh vent, and the twelfth vent.

[0021] According to the aircraft fuel tank venting system of this utility model, by setting venting float valves at the eighth, ninth, eleventh and twelfth vents respectively, fuel spillage can be prevented when the aircraft is in a specific flight state.

[0022] Furthermore, in the aircraft fuel tank venting system of this utility model, it is preferable that the second left venting pipe and the second right venting pipe are respectively equipped with float drain valves.

[0023] According to the aircraft fuel tank venting system of this utility model, after the fuel level in the left wing fuel tank and the right wing fuel tank drops, it can ensure that the fuel in the second left vent pipe and the second right vent pipe flows out.

[0024] Furthermore, in the aircraft fuel tank venting system of this utility model, the first left-side venting pipeline preferably includes: a left-side main pipeline extending from the first vent to the left-wing venting fuel tank; a first left-side branch pipeline branching from the left-side main pipeline and extending to the third vent; and a second left-side branch pipeline branching from the left-side main pipeline and extending to the fifth vent. The first right-side venting pipeline includes: a right-side main pipeline extending from the second vent to the right-wing venting fuel tank; a first right-side branch pipeline branching from the right-side main pipeline and extending to the fourth vent; and a second right-side branch pipeline branching from the right-side main pipeline and extending to the sixth vent.

[0025] According to the aircraft fuel tank venting system of this utility model, it is easy to ensure that no fuel will continuously flow into the venting pipe when the aircraft is performing figure-eight maneuvers on the ground or large sideslips in the air that exceed the flight envelope.

[0026] Furthermore, in the aircraft fuel tank ventilation system of this utility model, the first vent is preferably located at the rear side of the central area, the second vent is located at the front side of the central area, and the second left branch pipe extends forward from the left main pipe to the vicinity of the front wall of the central wing fuel tank, then bends to the left and extends along the front wall to the fifth vent.

[0027] The aircraft fuel tank venting system of this invention helps to ensure that fuel does not continuously flow into the second left branch line during figure-eight maneuvers on the ground and large sideslips in the air that exceed the flight envelope.

[0028] Furthermore, in the aircraft fuel tank ventilation system of this utility model, preferably, the left main pipeline, the second left branch pipeline, the right main pipeline and the second right branch pipeline are each equipped with a float drain valve.

[0029] According to the aircraft fuel tank venting system of this utility model, after the fuel level in the center wing fuel tank drops, it can ensure that the fuel in the left main pipeline, the second left branch pipeline, the right main pipeline and the second right branch pipeline flows out. Attached Figure Description

[0030] Figure 1 This is a top view schematic diagram illustrating an embodiment of the aircraft fuel tank ventilation system of this utility model.

[0031] Figure 2 This is a top view schematic diagram showing the central wing fuel tank portion of the aircraft fuel tank ventilation system according to an embodiment of the present invention.

[0032] Figure 3 This is a top view of the left wing fuel tank and the left wing ventilation fuel tank portion of the aircraft fuel tank ventilation system according to an embodiment of the present invention, wherein the illustration of the first left-side ventilation pipe is omitted.

[0033] Figure 4 This is a schematic diagram illustrating the ventilation status of the aircraft fuel tank ventilation system according to the present invention when the aircraft is on the ground and stopped.

[0034] Figure 5 This is a schematic diagram illustrating the ventilation status of the aircraft fuel tank ventilation system according to an embodiment of the present invention during aircraft climb.

[0035] Figure 6This is a schematic diagram illustrating the ventilation status of the aircraft fuel tank ventilation system according to an embodiment of the present invention during an emergency descent of the aircraft.

[0036] Figure 7 This is a schematic diagram illustrating the ventilation status of the aircraft fuel tank ventilation system according to an embodiment of the present invention during the sideslip of an aircraft.

[0037] (Symbol Explanation)

[0038] P1 First left-side ventilation line

[0039] P11 Left Main Road

[0040] P12 First left-side branch pipe

[0041] P13 Second left branch pipe

[0042] P2 First right-side ventilation line

[0043] P21 Right side main road

[0044] P22 First right-side branch pipe

[0045] P23 Second right-side branch pipe

[0046] P3 Second left-side ventilation line

[0047] P4 Second right-side ventilation line

[0048] 1 First vent

[0049] 2 Second vent

[0050] 3 Third ventilation port

[0051] 4. Fourth vent

[0052] 5. Fifth ventilation port

[0053] 6. Sixth vent

[0054] 7. Seventh vent

[0055] 8. Eighth vent

[0056] 9. Ninth vent

[0057] 10. Tenth vent

[0058] 11 Eleventh Vent

[0059] 12 Twelfth Vent

[0060] TC Central Wing Fuel Tank

[0061] TL left-wing fuel tank

[0062] TR right wing fuel tank

[0063] VTL Left-side vent tank

[0064] VTR right-side vent tank

[0065] PT1 partition wall

[0066] PT2 partition wall

[0067] PT3 partition wall

[0068] PT4 partition wall

[0069] R1 Semi-sealed rib

[0070] R2 Semi-sealed rib

[0071] R3 Semi-sealed Rib

[0072] R4 Semi-sealed Rib

[0073] R5 Semi-sealed Rib

[0074] R6 Semi-sealed Rib

[0075] A1 Left side area

[0076] A2 Central Area

[0077] A3 Right side area

[0078] A4 Left Wing Fuel Tank Left Side Area

[0079] A5 Left Wing Fuel Tank Central Area

[0080] A6 Left Wing Fuel Tank Right Side Area

[0081] A7 right wing fuel tank left side area

[0082] A8 right wing fuel tank central area

[0083] A9 right wing fuel tank right side area

[0084] V1 float valve

[0085] V2 float valve

[0086] V3 float valve

[0087] V4 float valve

[0088] V5 float valve

[0089] V6 float valve Detailed Implementation

[0090] Below, in conjunction with Figures 1 to 7The present invention describes the aircraft fuel tank ventilation system (aircraft fuel tank ventilation architecture) according to the embodiments of the present invention.

[0091] For ease of explanation, the directions "forward," "backward," "left," and "right" are defined based on the aircraft's centerline. That is, the direction in which the aircraft's centerline extends is defined as the forward / backward direction, the side where the aircraft's nose is located is defined as the forward side, the side where the tail and nose are located is defined as the rear side, the left side of the aircraft's centerline is defined as the left side, and the right side of the aircraft's centerline is defined as the right side.

[0092] like Figure 1 As shown, the aircraft fuel tanks include: a center wing fuel tank TC; a left wing fuel tank TL located to the left of the center wing fuel tank TC; and a right wing fuel tank TR located to the right of the center wing fuel tank TC. In other words, the aircraft has a three-tank layout. Furthermore, the interior of the center wing fuel tank TC is divided into a left-side region A1, a central region A2, and a right-side region A3 by two semi-sealed ribs R1 and R2. The interior of the left wing fuel tank TL is divided into a left-side region A4, a central region A5, and a right-side region A6 by two semi-sealed ribs R3 and R4. The interior of the right wing fuel tank TR is divided into a left-side region A7, a central region A8, and a right-side region A9 by two semi-sealed ribs R5 and R6.

[0093] (The overall structure of the aircraft fuel tank venting system)

[0094] like Figure 1As shown, the aircraft fuel tank venting system includes: a first left-side vent pipe P1, which connects the center wing fuel tank TC to the left wing venting fuel tank VTL; and a first right-side vent pipe P2, which is independent of the first left-side vent pipe P1 and connects the center wing fuel tank TC to the right wing venting fuel tank VTR. Furthermore, the first left-side vent pipe P1 has: a first vent 1 located on the left side and above (i.e., the upper part of the fuel tank's internal space, hereinafter the same) within the central region A2; a third vent 3 located on the rear side and above within the left-side region A1; and a fifth vent 5 located on the front side and above within the left-side region A1 and consisting of an open structure. Furthermore, the first right-side vent pipe P2 is asymmetrical relative to the first left-side vent pipe P1, and has: a second vent 2 located on the right side and above the central region A2; a fourth vent 4 located on the rear side and above the right side of the right region A3; and a sixth vent 6 located on the front side and above the right region A3, which is an open structure. Also, one of the first vent 1 and the second vent 2 is located on the rear side of the central region A2, and the other is located on the front side of the central region A2 (in the illustrated example, the first vent 1 is located on the rear side, and the second vent 2 is located on the front side). Furthermore, the third vent 3 and the fifth vent 5 are located on the left side of the left region A1; the fourth vent 4 and the sixth vent 6 are located on the right side of the right region A3.

[0095] Here, as Figure 1 As shown, the aircraft fuel tank venting system further includes: a second left-side vent pipe P3, which is independent of the first left-side vent pipe P1 and connects the left-wing fuel tank TL to the left-wing venting fuel tank VTL; and a second right-side vent pipe P4, which is independent of the first right-side vent pipe P2 and connects the right-wing fuel tank TR to the right-wing venting fuel tank VTR. Furthermore, the second left-side vent pipe P3 has: a seventh vent 7 located in the central region A5 of the left-wing fuel tank, positioned forward and upward, and consisting of an open structure; and an eighth vent 8 located in the left-side region A4 of the left-wing fuel tank, positioned forward and upward. Furthermore, the second right-side vent pipe P4 has: a tenth vent 10 located in the central region A8 of the right-wing fuel tank, positioned forward and upward, and consisting of an open structure; and an eleventh vent 11 located in the right-side region A9 of the right-wing fuel tank, positioned forward and upward. A ninth vent 9 is provided through the partition wall PT3 between the left wing fuel tank TL and the left wing vent fuel tank VTL; a twelfth vent 12 is provided through the partition wall PT4 between the right wing fuel tank TR and the right wing vent fuel tank VTR.

[0096] Furthermore, although not illustrated, the central area A2 is divided into a front area and a rear area by the aircraft's spanwise beam. The first vent 1 is located in one of the front area and the rear area, and the second vent 2 is located in the other of the front area and the rear area (in the illustrated example, the first vent 1 is located in the rear area and the second vent 2 is located in the front area).

[0097] Furthermore, although not shown in the diagram, venting float valves are respectively installed at the first vent 1, the second vent 2, the third vent 3, and the fourth vent 4. Similarly, although not shown in the diagram, venting float valves are respectively installed at the eighth vent 8, the ninth vent 9, the eleventh vent 11, and the twelfth vent 12.

[0098] (Structure of the first left-side ventilation pipe P1)

[0099] like Figure 1 and Figure 2 As shown, the first left-side vent line P1 includes: a left-side main line P11 extending from the first vent 1 to the left-wing vent tank VTL; a first left-side branch line P12 branching from the left-side main line P11 and extending to the third vent 3; and a second left-side branch line P13 branching from the left-side main line P11 and extending to the fifth vent 5.

[0100] Here, as Figure 1 As shown, the left main pipeline P11 extends from the first vent 1 to the left and passes through the semi-sealed rib R1, the partition wall PT1 between the central wing fuel tank TC and the left wing fuel tank TL, the semi-sealed rib R3 (corresponding to the semi-sealed rib of the fuel collection tank), the semi-sealed rib R4 (corresponding to the semi-sealed rib of the outer wing tank), and finally passes through the partition wall PT3 between the left wing fuel tank TL and the left wing vent fuel tank VTL.

[0101] In addition, such as Figure 1 and Figure 2 As shown, when viewed from above, the first left branch pipe P12 extends roughly in a straight line from the left main pipe P11 near the partition wall PT1 towards the rear, until it reaches the third vent 3 near the rear side wall of the central wing fuel tank TC.

[0102] In addition, such as Figure 1 and Figure 2 As shown, when viewed from above, the second left branch pipe P13 extends in a roughly straight line from the left main pipe P11 near the semi-sealed rib R1 towards the front side to the vicinity of the front wall of the central wing tank TC, and then extends to the left along the front wall of the central wing tank TC until it reaches the fifth vent 5 near the partition wall PT1.

[0103] In addition, such as Figure 1As shown, the left main pipeline P11 and the second left branch pipeline P13 are each equipped with at least one float drain valve V1 and V3.

[0104] (Structure of the first right-side ventilation pipe P2)

[0105] like Figure 1 and Figure 2 As shown, the first right-side vent line P2 includes: a right-side main line P21 extending from the second vent 2 to the right-wing vent tank VTR; a first right-side branch line P22 branching from the right-side main line P21 and extending to the fourth vent 4; and a second right-side branch line P23 branching from the right-side main line P21 and extending to the sixth vent 6.

[0106] Here, as Figure 1 As shown, the right main pipeline P21 extends from the second vent 2 to the right and passes through the semi-sealed rib R2, the partition wall PT2 between the central wing fuel tank TC and the right wing fuel tank TR, the semi-sealed rib R5 (corresponding to the semi-sealed rib of the fuel collection tank), the semi-sealed rib R6 (corresponding to the semi-sealed rib of the outer wing tank), and finally passes through the partition wall PT4 between the right wing fuel tank TR and the right wing vent fuel tank VTR.

[0107] In addition, such as Figure 1 and Figure 2 As shown, when viewed from above, the first right-side branch pipe P22 extends roughly in a straight line from the right-side main pipe P21 near the partition wall PT2 towards the rear, until it reaches the fourth vent 4 near the rear side wall of the central wing fuel tank TC.

[0108] In addition, such as Figure 1 and Figure 2 As shown, when viewed from above, the second right-side branch pipe P23 extends roughly in a straight line from the right-side main pipe P21 near the semi-sealed rib R2 towards the right, until it reaches the sixth vent 6 near the front side wall of the central wing fuel tank TC.

[0109] In addition, such as Figure 1 As shown, the right main pipeline P21 and the second right branch pipeline P23 are each equipped with at least one float drain valve V2 and V4.

[0110] (Second left-side ventilation line)

[0111] like Figure 1 and Figure 3 As shown, when viewed from above, the second left-side vent pipe P3 extends from the seventh vent 7 near the front side wall of the left-wing fuel tank TL along the front side wall of the left-wing fuel tank TL toward the left, passes through the eighth vent 8 near the front side wall of the left-wing fuel tank TL and near the semi-sealed rib R3, and finally passes through the partition wall PT3.

[0112] Here, as Figure 1As shown, the second left-side vent pipe P3 is equipped with at least one float drain valve V5.

[0113] (Second right-side ventilation line)

[0114] like Figure 1 As shown, when viewed from above, the second left-side vent pipe P4 extends from the tenth vent 10 near the front side wall of the right wing tank TR along the front side wall of the right wing tank TR toward the right, passes through the eleventh vent 11 near the front side wall of the right wing tank TR and near the semi-sealed rib R4, and finally passes through the partition wall PT4.

[0115] Here, as Figure 1 As shown, the second right-side vent pipe P4 is equipped with at least one float drain valve V6.

[0116] (The ventilation status of the aircraft fuel tank venting system under various aircraft attitudes)

[0117] like Figure 4 As shown, when the aircraft is on the ground and stationary, the center wing fuel tank TC, which is full of fuel, can be ventilated through the fifth vent 5 and the sixth vent 6.

[0118] like Figure 5 As shown, during the aircraft's climb, the fully fueled center wing fuel tank TC can be ventilated through the second vent 2, the fifth vent 5, and the sixth vent 6.

[0119] like Figure 6 As shown, in the emergency descent state of the aircraft, the center wing fuel tank TC can be ventilated through the third vent 3 and the fourth vent 4 at low pitch angles.

[0120] like Figure 7 As shown, by placing the fifth vent 5 and the sixth vent 6 in the gas phase space under the full-fuel limit sideslip condition near the front sidewall of the center wing fuel tank TC, the inerting system will not cause a large amount of fuel to flow into the vent pipes during the aircraft's sideslip condition.

[0121] (Main effects of this implementation method)

[0122] According to the aircraft fuel tank venting system of this embodiment, the first left-side venting pipe P1, which connects the center wing fuel tank TC and the left wing venting fuel tank VTL, extends from the first vent 1 located on the left side of the central region A2 of the center wing fuel tank TC towards the left. Similarly, the first right-side venting pipe P2, which connects the center wing fuel tank TC and the right wing venting fuel tank VTR, extends from the second vent 2 located on the right side of the central region A2 of the center wing fuel tank TC towards the right. There is no need for them to cross each other, and the first left-side venting pipe P1 and the first right-side venting pipe P2 are asymmetrical, thus helping to shorten the first left-side venting pipe... The lengths of the air duct P1 and the first right-side air duct P2 simplify the system structure and reduce system weight. This also helps reduce installation work, lower operating costs, and improve maintainability. Furthermore, multiple air vents are located at various positions around the center wing fuel tank TC, enabling effective communication between the tank and the outside atmosphere under various aircraft attitudes, thus improving system reliability. Additionally, the fifth and sixth air vents 5 and 6 are open, allowing communication with the atmosphere, effectively preventing pressure buildup and fuel spillage, further enhancing system reliability.

[0123] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above embodiments.

[0124] For example, in the above embodiment, the first left-side ventilation pipe P1 and the first right-side ventilation pipe P2 can also be interchanged, that is, the first left-side ventilation pipe P1 is formed as Figure 1 The first right-side ventilation pipe P2 is configured as follows, and the first right-side ventilation pipe P2 is formed as follows. Figure 1 The shape of the first left-side ventilation line P1 in the middle.

[0125] Furthermore, in the above embodiment, the central region A2 is divided into a front region and a rear region by the aircraft's spanwise beam, but it is not limited to this, and the aircraft may not have the aforementioned spanwise beam.

[0126] It should be understood that within the scope of this utility model, the various parts in the embodiments can be freely combined, or the various parts in the embodiments can be appropriately modified or omitted.

Claims

1. An aircraft fuel tank venting system, the aircraft fuel tank comprising: Central wing fuel tank; And the left wing ventilated fuel tank and the right wing ventilated fuel tank located on the left and right sides of the central wing fuel tank, characterized in that they include: A first left-side vent line, which connects the center wing fuel tank to the left-wing vent fuel tank; and A first right-side vent line, independent of the first left-side vent line, connects the center wing fuel tank to the right-wing vent fuel tank. The interior of the central wing fuel tank is divided into a left-side region, a central region, and a right-side region by two semi-sealed ribs. The first left-side vent pipe has: a first vent located on the left side and above the central area; a third vent located on the rear side and above the left-side area; and a fifth vent located on the front side and above the left-side area and consisting of an open opening. The first right-side venting line is asymmetrical relative to the first left-side venting line and has: a second vent located on the right side and above the central region; a fourth vent located on the rear side and above the right-side region; and a sixth vent located on the front side and above the right-side region and consisting of an open opening. One of the first vent and the second vent is located on the rear side of the central area, and the other is located on the front side of the central area.

2. The aircraft fuel tank venting system according to claim 1, characterized in that, The third vent and the fifth vent are located on the left side of the left-side area. The fourth and sixth vents are located on the right side of the right-side area.

3. The aircraft fuel tank venting system according to claim 1, characterized in that, The aircraft fuel tank also includes: a left-wing fuel tank located between the center wing fuel tank and the left wing vent fuel tank; and a right-wing fuel tank located between the center wing fuel tank and the right wing vent fuel tank. The interior of the left-wing fuel tank is divided into a left-side region, a central region, and a right-side region by two semi-sealed ribs. Also includes: A second left-side vent line, independent of the first left-side vent line, connects the left-wing fuel tank to the left-wing vent fuel tank; and A second right-side vent line, independent of the first right-side vent line, connects the right-wing fuel tank to the right-wing vent fuel tank. The second left-side vent pipe has: a seventh vent located at the front and upper part of the central area of ​​the left-wing fuel tank and consisting of an open opening; and an eighth vent located at the front and upper part of the left-side area of ​​the left-wing fuel tank. The interior of the right-wing fuel tank is divided into a left-side area, a central area, and a right-side area by two semi-sealed ribs. The second right-side vent pipe has: a tenth vent located at the front and upper part of the central area of ​​the right-wing fuel tank and consisting of an open opening; and an eleventh vent located at the front and upper part of the right-side area of ​​the right-wing fuel tank. A ninth vent is provided through the partition wall between the left wing fuel tank and the left wing vent fuel tank. A twelfth vent is provided through the partition wall between the right wing fuel tank and the right wing vent fuel tank.

4. The aircraft fuel tank venting system according to claim 1, characterized in that, The central region is divided into a front region and a rear region by spanwise beams. The first vent is located in one of the front region and the rear region. The second vent is located on the other side of the front and rear regions.

5. The aircraft fuel tank venting system according to claim 1, characterized in that, A venting float valve is provided at the first vent, the second vent, the third vent, and the fourth vent.

6. The aircraft fuel tank venting system according to claim 3, characterized in that, Ventilation float valves are respectively installed at the eighth vent, the ninth vent, the eleventh vent, and the twelfth vent.

7. The aircraft fuel tank venting system according to claim 3, characterized in that, The second left vent pipe and the second right vent pipe are each equipped with a float drain valve.

8. The aircraft fuel tank venting system according to claim 1, characterized in that, The first left-side venting line includes: a left-side main line extending from the first vent to the left-side vent tank; a first left-side branch line branching from the left-side main line and extending to the third vent; and a second left-side branch line branching from the left-side main line and extending to the fifth vent. The first right-side venting line includes: a right-side main line extending from the second vent to the right-wing venting tank; a first right-side branch line branching from the right-side main line and extending to the fourth vent; and a second right-side branch line branching from the right-side main line and extending to the sixth vent.

9. The aircraft fuel tank venting system according to claim 8, characterized in that, The first vent is located on the rear side of the central area. The second vent is located on the front side of the central area. The second left branch pipe extends forward from the left main pipe to the vicinity of the front wall of the central wing fuel tank, then bends to the left and extends along the front wall to the fifth vent.

10. The aircraft fuel tank venting system according to claim 8, characterized in that, The left main pipeline, the second left branch pipeline, the right main pipeline, and the second right branch pipeline are each equipped with a float drain valve.

Images