An anti-overflow device for an aircraft fuel vent tank

Abstract

The utility model belongs to the technical field of vented fuel tank, disclose an anti -spill oil device of aircraft fuel vented fuel tank, including annular hopper and baffle, annular hopper is set on the upper portion pipeline of stamping vent, the upper opening of annular hopper is equipped with the baffle of a ring, the circumferential of baffle is equipped with overflow hole. The anti -spill oil device of aircraft fuel vented fuel tank provided by the utility model can effectively block the fuel spill of aircraft when making big maneuver, reduce the fire danger.

Description

Technical Field

[0001] This utility model belongs to the technical field of ventilated fuel tanks and relates to a device related to aircraft fuel tanks, specifically a fuel spill prevention device for aircraft fuel ventilated fuel tanks. Background Technology

[0002] During refueling, the added fuel replaces the air in the fuel tanks. For safety reasons, fuel spillage must be prevented from entering the aircraft. To reliably achieve this, a vent tank (sometimes called a spill containment tank) is installed to temporarily store any fuel that may enter the vent lines. Aircraft fuel tank venting systems are divided into open and closed types. For most commercial aircraft, the vent tank is located near the wingtip and uses an "open venting system," allowing the empty space above the fuel level in each fuel tank to be open to the outside atmosphere.

[0003] Throughout the entire flight envelope, proper fuel tank venting is crucial, allowing the fuel tanks to "breathe" as the aircraft climbs and descends. Without such venting, a large pressure difference would create a vacuum between the fuel-free space and the outside atmosphere, resulting in significant forces acting on the fuel tank structure. The idea of ​​adapting to these forces through wing structure design is impractical, as it would lead to weight loss. Therefore, the venting system plays a critical role in protecting the fuel tank structure from structural failure during transitional flights between ground level and cruising altitude.

[0004] When an aircraft is refueling on the ground, the venting system uses overflow sensors, venting tank capacity design (such as the Boeing 787's venting tank capacity of 1,200 liters), and NACA intake guide structure to guide excess fuel to a safe area for discharge.

[0005] When an aircraft enters a maneuvering state, the rolling motion significantly impacts the fuel in the fuel tanks. When the fuel load is high, some fuel may enter the vent tank through the vent line. Typically, the vent tank only holds tens to hundreds of kilograms of fuel. As the fuel sloshes around, and the sloshing is intense, fuel may overflow from the vent, increasing the risk of fire. Therefore, effectively designing the vent to prevent overflow is crucial for flight safety. Utility Model Content

[0006] Therefore, this utility model provides an anti-overflow device for an aircraft fuel vent tank. By using an annular funnel and a baffle plate set above, the splashed fuel can be redirected, effectively reducing fuel overflow.

[0007] The technical solution of this utility model is as follows: An anti-overflow device for an aircraft fuel vent tank includes an annular funnel and a baffle plate. The annular funnel is fitted above the upper part of the stamping vent pipe, and an annular baffle plate is provided at the upper opening of the annular funnel. The baffle plate has flow holes in its circumference.

[0008] Furthermore, a drain hole is provided at the lowest point of the contact between the bottom of the annular funnel and the upper part of the vent pipe.

[0009] Furthermore, the lowest point of the flow passage is lower than the air inlet / outlet end of the upper pipe of the stamping vent.

[0010] Furthermore, the baffle plate is provided with several flow holes at even intervals around its circumference.

[0011] Furthermore, the annular funnel is a polyhedral funnel, with the baffle corresponding to a polygonal annular body, and each face of the baffle has at least one flow hole.

[0012] Furthermore, the flow passage is a quasi-elliptical hole that is long in the longitudinal direction and narrow in the transverse direction.

[0013] Technical effects: The fuel venting tank overflow prevention device provided by this utility model can effectively prevent fuel overflow during high-speed aircraft maneuvers, reducing the risk of fire. Attached Figure Description

[0014] Figure 1 This is a schematic diagram illustrating the principle of this utility model.

[0015] Among them, 1. Annular funnel, 2. baffle plate, 3. flow hole, 4. drain hole, 5. upper pipeline of stamping vent. Detailed Implementation

[0016] The features and illustrative embodiments of various aspects of this utility model will now be described in detail. Numerous specific design details are set forth in the following detailed description to provide a more complete understanding of this utility model. However, it will be apparent to those skilled in the art that this utility model can be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of this utility model by illustrating examples of it. This utility model is by no means limited to any specific setup and method set forth below, but covers any improvements, substitutions, and modifications to the structure, method, and device without departing from the spirit of this utility model. In the drawings and the following description, any parts not exhaustively described are considered to be common knowledge or conventional practices in the art.

[0017] It should be noted that, where there is no conflict, the embodiments of this utility model and the features therein can be combined with each other, and the various embodiments can be referenced and cited in turn. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] Example 1: An anti-overflow device for an aircraft fuel vent tank includes an annular funnel 1 and a baffle plate 2. The annular funnel 1 is fitted above the upper pipe 5 of the stamping vent. An annular baffle plate 2 is provided at the upper opening of the annular funnel 1, and the baffle plate 2 is provided with flow holes 3 around its circumference.

[0019] A drain hole 4 is provided at the lowest point of the contact between the bottom of the annular funnel 1 and the upper part of the stamping vent pipe 5.

[0020] The lowest point of the flow hole 3 is lower than the air inlet and outlet end of the upper pipe 5 of the stamping vent.

[0021] The baffle plate 2 has several flow holes 3 evenly spaced around its circumference.

[0022] The annular funnel 1 is a polyhedral funnel, and the baffle plate 2 is a polygonal annular body. Each face of the baffle plate 2 has at least one flow hole 3.

[0023] The flow passage 3 is a longitudinally long and laterally narrow elliptical hole.

[0024] Example 2: This utility model includes: an annular funnel, a baffle plate, a flow passage, and a drain hole. The upper end of the annular funnel is a baffle plate, the baffle plate has flow passages around its perimeter, and the lowest point of the annular funnel in contact with the vent pipe has a drain hole for draining liquid.

[0025] The lowest position of the overflow orifice should be lower than the air inlet outlet end to avoid affecting the maximum oil capacity of the vent tank.

[0026] The shape of the flow passage can be a combination of some basic shapes, such as squares, rectangles, triangles and circles, and should have the function of flow passage.

[0027] The linear shape of an annular funnel includes, but is not limited to, a "straight line" shape, and can also be a linear shape with nonlinear equations.

[0028] The shape of the drainage hole can be a combination of basic shapes such as square, rectangle, triangle and circle. It should have drainage function and at least two holes should be arranged to ensure timely drainage.

[0029] like Figure 1This utility model consists of an annular funnel, a baffle plate, flow holes, and drain holes. For ease of manufacturing, the inclined surface of the annular funnel is straight. Four drain holes, circular in shape, are located at the rounded corners of the vent pipe, ensuring timely discharge of fuel entering the funnel. The flow holes are elongated, such as a combination of rectangles and circles, with the lowest point below the vent outlet. The flow holes on adjacent sides are identical in shape, and the number is 4×3.

[0030] The device is installed in the vent tank along with the NACA vent line. When a certain amount of fuel accumulates in the vent tank and undergoes significant swirling, the device can effectively reduce the probability of fuel overflowing from the vent.

[0031] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of the present utility model, and these improvements should also be considered within the protection scope of the present utility model.

Claims

1. A fuel spill prevention device for an aircraft fuel vent tank, characterized in that, It includes an annular funnel (1) and a baffle plate (2). The annular funnel (1) is fitted above the upper pipe (5) of the stamping vent. An annular baffle plate (2) is provided at the upper opening of the annular funnel (1). The baffle plate (2) is provided with a flow hole (3) around its circumference.

2. The anti-overflow device for an aircraft fuel vent tank according to claim 1, characterized in that, The lowest point of the contact between the bottom of the annular funnel (1) and the upper part of the vent pipe (5) is provided with a drain hole (4).

3. The anti-overflow device for an aircraft fuel vent tank according to claim 1, characterized in that, The lowest point of the flow hole (3) is lower than the air inlet outlet end of the upper pipe (5) of the stamping vent.

4. The anti-overflow device for an aircraft fuel vent tank according to claim 1, characterized in that, The baffle plate (2) has several flow holes (3) evenly spaced around its circumference.

5. The anti-overflow device for an aircraft fuel vent tank according to claim 1, characterized in that, The annular funnel (1) is a polyhedral funnel, and the baffle plate (2) is a polygonal annular body. Each face of the baffle plate (2) has at least one flow hole (3).

6. The anti-overflow device for an aircraft fuel vent tank according to claim 1, characterized in that, The flow passage (3) is an elliptical hole that is long in the longitudinal direction and narrow in the transverse direction.

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