Adjustable and easily disassembled air door for passenger aircraft

Abstract

The present invention belongs to the field of APU compartment damper structure design on aircraft, and specifically relates to an adjustable and easily disassembled damper for passenger aircraft, including a damper machine plus an inner door panel, a damper skin outer panel, a sheet metal angle, a gooseneck hinge, a hollow shaft with a flange, and a rocker arm; specifically, the damper of the APU compartment is designed into a combined structure, connected by fasteners, to reduce the weight of the overall machine plus damper, and a gooseneck hinge fastener connection method and a three-section flange shaft design method are used to design a damper structure with high weight reduction, which is adjustable and easy to disassemble, and realizes the damper function and weight reduction purpose. The present invention has many beneficial effects such as structural weight reduction, large adjustable space, reduced maintenance time and low maintenance cost.

Description

Technical Field

[0001] The present invention belongs to the field of structural design of air door of APU compartment on aircraft, and specifically relates to an adjustable and easily disassembled air door of passenger aircraft. Specifically, the air door of APU compartment is designed into a combined structure, connected by fasteners, so as to reduce the weight of the whole machine plus air door, and a high weight reduction, adjustable and easily disassembled air door structure is designed by adopting a gooseneck hinge fastener connection method and a three-section flange shaft design method, so as to realize the air door function and weight reduction purpose. Background Art

[0002] The APU damper of the APU cabin of a civil airliner is designed to be a hyperbolic door of unequal thickness. The air intake system of the APU includes the air intake door and its driving mechanism, the air intake duct, and the cooling duct. Fresh air enters the air intake duct through the air intake door, and part of it is converted into bleed air by the load compressor to drive the APU. The other part passes through the two-stage compressor, mixes with the fuel, and enters the combustion chamber to burn and release energy to drive the blades to work. The high-temperature exhaust gas generated by the APU is discharged through the exhaust pipe (after noise reduction through the muffler and through the tail nozzle). At the same time, the air intake system is also responsible for providing sufficient cooling air for the cooling of the APU cabin, so that each component of the APU is in a suitable ambient temperature during operation to ensure its performance and life. Therefore, it is very important to design a high-weight reduction, adjustable and easy-to-disassemble damper.

[0003] Patent content

[0004] In order to solve the above problems, the technical solution adopted by the present invention is to divide the damper into two inner and outer panels. The outer panel of the damper skin is installed on the damper machine plus inner panel through detachable fasteners. In order to save raw materials and improve machining efficiency, two gooseneck hinges are added and connected with the damper machine plus inner panel through fasteners. The two gooseneck hinges and three hollow shafts with flanges are connected together through fasteners to meet the appearance requirements of the damper. The hollow damper is light in weight, easy to manufacture, adjustable, easy to install and disassemble, thereby realizing unobstructed maintenance access of the damper and reducing manufacturing difficulty and maintenance cost.

[0005] To achieve the above purpose, the technical solution adopted by this patent is as follows:

[0006] An adjustable and easily disassembled air door for a passenger aircraft comprises an air door machine and an inner door panel 1, an outer air door skin panel 2, a sheet metal angle 3, a gooseneck hinge 4, a hollow shaft with a flange 5 and a rocker arm 6;

[0007] The inner side of the edge of the damper plus inner door panel 1 is fixedly connected to the sheet metal angle 3 by fasteners; the sheet metal angle 3 is provided with bolt holes, and the damper skin outer door panel 2 is connected to the sheet metal angle 3 by detachable fasteners; the damper plus inner door panel 1 and the damper skin outer door panel 2 are connected to form an integral damper by the sheet metal angle 3;

[0008] There are two gooseneck hinges 4, one end of which passes through the damper machine plus inner door panel 1 and is fixed to the inner surface of the damper machine plus inner door panel 1 by a fastener;

[0009] The hollow shaft 5 with flanges includes a hollow shaft with flanges at both ends and two hollow shafts with flanges at one end; the hollow shaft with flanges at both ends is located in the middle of the other ends of the two gooseneck hinges 4, and the two hollow shafts 5 with flanges at one end are respectively located at the two outer sides of the other ends of the two gooseneck hinges 4; the flanges of the two hollow shafts 5 with flanges at one end are arranged close to the other ends of the gooseneck hinges 4;

[0010] The other end of the gooseneck hinge 4 is provided with a bolt hole, which can match the bolt hole of the flange of the hollow shaft with flange 5; the other end of the gooseneck hinge 4 is fitted with the flange surface of the hollow shaft with flange 5, and the other ends of the two gooseneck hinges 4 are connected to the hollow shaft with flange 5 through detachable bolts;

[0011] One end of the rocker arm 6 is provided with a bearing, and is connected to the shaft of a hollow shaft with a flange at one end through the bearing.

[0012] After the flange hollow shaft 5 and the rocker arm connector 6 are connected, they are connected to the damper actuating mechanism to form a complete damper, which satisfies the damper functional movement.

[0013] Furthermore, the structure of the damper machine plus inner door panel 1 is a machined part with a strict functional appearance, and the damper skin outer door panel 2 is a sheet metal part.

[0014] Furthermore, an adjustment gasket is provided between the gooseneck hinge 4 and the connection between the damper and the inner door panel 1. During the installation process, the relative position of the gooseneck hinge and the damper and the inner door panel 1 is adjusted by adding or reducing the adjustment gasket.

[0015] Furthermore, an adjusting gasket is provided at the connection between the gooseneck hinge 4 and the hollow shaft with flange 5, and the position of the door and the shaft can be adjusted by adding or subtracting the adjusting gasket to coordinate the installation.

[0016] Furthermore, the detachable fastener is a single-sided detachable bolt.

[0017] The installation and removal methods of the adjustable and easily removable damper of a passenger aircraft include the following:

[0018] Installation method: The sheet metal angle 3 and the damper plus inner door panel 1 are fixedly connected by fasteners, one end of the gooseneck hinge 4 passes through the damper plus inner door panel 1, and is fixed to the inner surface of the damper plus inner door panel 1 by fasteners, and after the hollow shafts 5 with flanges at both ends of the gooseneck hinge 4 pass through the damper door frame, the gooseneck hinge 4 is connected to the hollow shafts 5 with flanges by bolts, and after adjusting the damper position, the damper skin outer door panel 2 is installed on the sheet metal angle 3 of the damper inner door panel 1 using detachable fasteners to complete the installation of the entire damper;

[0019] Disassembly method: Remove the detachable bolts between the gooseneck hinge 4 and the hollow shaft with flange 5, and the combined damper is removed.

[0020] Beneficial effects of the present invention:

[0021] 1. Structural weight reduction: The damper is located in the hyperbolic section, and the inner surface of the damper is a special complex curved surface. In order to reduce weight, it is designed as a combined damper. The inner panel uses a machined hollow structure, and the outer panel uses sheet metal thin plates. The sheet metal angle material connects the damper machine plus the inner panel and the damper skin outer panel together to form a combined damper, achieving the use function and weight reduction. The design of a three-section hollow shaft with a flange also meets the weight reduction requirements.

[0022] 2. Large adjustable space: Since the damper adopts a combined design, the damper can be adjusted by adding gaskets when installing the damper and gooseneck hinge. The gooseneck hinge and hollow shaft flange can also be adjusted by adding or subtracting gaskets to compensate for manufacturing errors and meet the functional requirements of the damper.

[0023] 3. Reduce maintenance time: The damper is assembled by fasteners. The damper is already an integral damper assembly when it is installed. The three flange hollow shafts are easy to adjust during installation, which makes installation easy and reduces maintenance time. It is simple to dismantle the damper. Just remove the flange and gooseneck hinge fasteners, and the damper is successfully disassembled.

[0024] 4. Low maintenance cost: no fastener loss, reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of a highly weight-reducing, adjustable, and easy-to-install air door into an aircraft.

[0026] Figure 2 It is a schematic diagram of a highly weight-reducing, adjustable, easy-to-install damper with the damper sheet metal outer panel removed from the aircraft inner structure.

[0027] Figure 3 It is a schematic diagram of the structure of a highly weight-reducing, adjustable, easy-to-install throttle toward an aircraft hollow shaft and a gooseneck hinge.

[0028] The meaning of the marks in the figure: 1-throttle machine plus inner door panel, 2-throttle skin outer door panel, 3-sheet metal angle, 4-gooseneck hinge, 5-hollow shaft with flange, 6-rocker lever DETAILED DESCRIPTION

[0029] The present invention is further described in detail below, but is not intended to limit the present invention in any way.

[0030] An adjustable and easily disassembled damper for a passenger aircraft comprises a damper machine plus an inner panel 1 and a damper outer skin panel 2; the damper machine plus inner panel 1 and the damper outer skin panel 2 are connected by a sheet metal angle 3 fastener; a gooseneck hinge 4 is connected to the damper machine plus inner panel 1 by means of detachable bolts; the gooseneck hinge 4 and a hollow shaft with a flange 5 are connected by means of detachable bolts; the gooseneck hinge 4 is in a sheet shape, sandwiched between three sections of a hollow flange shaft and connected to the flange; the hollow shaft with a flange 5 is connected to a door frame by a bushing, and a rocker arm connector 6 and the hollow shaft with a flange 5 are connected by bearings.

[0031] The structure of the damper machine plus inner panel 1 is: a machined part with a complex shape.

[0032] The damper outer skin panel 2 and the sheet metal angle 3 are connected by detachable fasteners; the gooseneck hinge 4 and the hollow shaft with flange 5 are connected by detachable bolts;

[0033] An adjustable and easily disassembled damper for a passenger aircraft, the installation and disassembly methods are as follows:

[0034] Installation method: the sheet metal angle 3 and the damper plus inner door panel 1 are fixed together by fasteners, the gooseneck hinge 4 passes through the damper plus inner door panel 1 and is fixed to the damper plus inner door panel 1 using detachable fasteners, after the hollow shaft 5 at both ends passes through the damper door frame, the gooseneck hinge 4 is connected together by bolts and the hollow shaft connection 5 with a flange, after adjusting the position, the damper skin outer door panel is installed to the sheet metal angle 3 of the damper inner door panel 1 using detachable fasteners.

[0035] Disassembly method: Remove the gooseneck hinge 4 and the hollow shaft with flange 5 fasteners. Remove the combined damper integral part.

Claims

1. An adjustable and easily detachable damper for a passenger aircraft, characterized in that: It comprises a damper machine plus an inner door panel (1), a damper skin outer door panel (2), a sheet metal angle (3), a gooseneck hinge (4), a hollow shaft with a flange (5) and a rocker arm (6); The inner side of the edge of the damper plus inner door panel (1) is fixedly connected to the sheet metal angle material (3) via a fastener; the sheet metal angle material (3) is provided with bolt holes, and the damper skin outer door panel (2) is connected to the sheet metal angle material (3) via a detachable fastener; the damper plus inner door panel (1) and the damper skin outer door panel (2) are connected to form an integral damper via the sheet metal angle material (3); There are two gooseneck hinges (4), one end of which passes through the damper machine inner door panel (1) and is fixed to the inner surface of the damper machine inner door panel (1) by a fastener; The hollow shaft with flanges (5) comprises a hollow shaft with flanges at both ends and two hollow shafts with flanges at one end; the hollow shaft with flanges at both ends is located in the middle of the other ends of the two gooseneck hinges (4), and the two hollow shafts with flanges at one end (5) are respectively located at the two outer sides of the other ends of the two gooseneck hinges (4); the flanges of the two hollow shafts with flanges at one end (5) are arranged close to the other ends of the gooseneck hinges (4); The other end of the gooseneck hinge (4) is provided with a bolt hole which can be matched with the bolt hole of the flange of the hollow shaft with flange (5); the other end of the gooseneck hinge (4) is fitted with the flange surface of the hollow shaft with flange (5), and the other ends of the two gooseneck hinges (4) are connected to the hollow shaft with flange (5) via detachable bolts; A bearing is provided at one end of the rocker arm (6), and is connected to a shaft portion of a hollow shaft having a flange at one end through the bearing; The flange hollow shaft (5) and the rocker arm (6) are connected to the damper actuating mechanism to form a complete damper, so as to perform the damper functional movement; The structure of the damper machine plus inner door panel (1) is a machined part with a strictly functional appearance, and the damper skin outer door panel (2) is a sheet metal part; An adjustment gasket is provided between the connection between the gooseneck hinge (4) and the damper plus inner door panel (1). During the installation process, the relative position of the gooseneck hinge and the damper plus inner door panel (1) is adjusted by adding or reducing the adjustment gasket.

2. The adjustable and easily detachable air door for passenger aircraft according to claim 1, characterized in that: An adjustment gasket is provided at the connection between the gooseneck hinge (4) and the hollow shaft (5) with a flange, and the position of the door and the shaft is adjusted by adding or subtracting the adjustment gasket to coordinate the installation.

3. The adjustable and easily detachable air door for passenger aircraft according to claim 1, characterized in that: The detachable fastener is a single-sided detachable bolt.

4. The installation and disassembly method of the adjustable and easily detachable air door for passenger aircraft according to claim 1 is characterized in that: Installation method: the sheet metal angle (3) and the damper plus inner door panel (1) are fixedly connected by fasteners, one end of the gooseneck hinge (4) passes through the damper plus inner door panel (1) and is fixed to the inner surface of the damper plus inner door panel (1) by fasteners, after the hollow shafts (5) with flanges at both ends of the gooseneck hinge (4) pass through the damper door frame, the gooseneck hinge (4) is connected to the hollow shaft (5) with flanges by bolts, after adjusting the damper position, the damper skin outer door panel (2) is installed on the sheet metal angle (3) of the damper plus inner door panel (1) by using detachable fasteners, thus completing the installation of the entire damper; Disassembly method: Remove the removable bolts between the gooseneck hinge (4) and the hollow shaft with flange (5) to dismantle the combined damper.

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