Device and method for measuring air tightness of inclined airtight floor in aircraft floor structure

Abstract

The invention relates to a device and method for measuring the airtightness of an inclined airtight floor in an aircraft floor structure, and the device comprises an airtight box, an upper cover plate, and a lower cover plate. The inner side of the airtight box is provided with an airtight measurement mounting edge, the upper and lower ends are opened, and the outer walls of the upper and lower ends are respectively provided with an upper concentric-square-shaped skirt edge and a lower concentric-square-shaped skirt edge; the air tightness measurement mounting edge is used for mounting an inclined airtight floor; a part above the air tightness measurement mounting edge in the air tightness box is an air tightness measurement space, and an air pressure loading space is arranged below the air tightness measurement mounting edge; an air pressure detection port, a flowmeter mounting port, a pressurizing air inlet and a pressurizing air outlet are formed in the side wall of the airtight box; the air pressure detection port and the flowmeter mounting port are communicated with the air tightness measurement space; the pressurizing air inlet and the pressurizing air outlet are communicated with the air pressure loading space; the upper cover plate is connected to the upper rectangular-ambulatory-plane skirt edge; and the lower cover plate is connected to the lower rectangular-ambulatory-plane skirt edge.

Description

Technical Field

[0001] The present application belongs to the technical field of air tightness measurement of inclined airtight floors in aircraft floor structures, and in particular relates to an air tightness measurement device and method for inclined airtight floors in aircraft floor structures. Background Art

[0002] In the aircraft floor structure, the lower side of the inclined airtight floor is connected to the central wing, the upper side is connected to the horizontal airtight floor, and the two sides are connected to the fuselage skin. In the actual aircraft structure, the in-plane load of the inclined airtight floor is released in the form of displacement while maintaining airtightness.

[0003] Air tightness is an important technical indicator for the assessment of inclined airtight floors. Currently, airbag loading technology is mostly used for measurement.

[0004] The airbag loading technology requires the production of a closed metal box to constrain the tension of the airbag outside the working surface of the air pressure load. The edge of the airbag is glued and connected to the metal box edge. The bonding process is not strictly controlled and the sealing cannot be guaranteed. Under high pressure load conditions, the airbag loading itself will have many small leaks that are difficult to find, as well as explosions, poor stamping control follow-up and many other defects and risks. It is difficult to be well applied to measure the airtightness of inclined airtight floors.

[0005] This application is proposed in view of the above-mentioned technical defects. Summary of the invention

[0006] The purpose of the present application is to provide an air tightness measurement device and method for an inclined airtight floor in an aircraft floor structure, so as to overcome or alleviate at least one of the existing technical defects.

[0007] The technical solution of this application is:

[0008] An air tightness measuring device for an inclined airtight floor in an aircraft floor structure, comprising an airtight box, an upper cover plate, and a lower cover plate;

[0009] The inner side of the airtight box is provided with an airtightness measurement installation edge, the upper and lower ends are open, and the outer walls of the upper and lower ends are respectively provided with an upper U-shaped skirt edge and a lower U-shaped skirt edge;

[0010] The airtightness measurement installation edge is used to install the inclined airtight floor;

[0011] The area above the airtightness measurement installation edge in the airtight box is the airtightness measurement space, and the area below is the air pressure loading space;

[0012] The side wall of the airtight box is provided with an air pressure detection port, a flow meter installation port, a pressurized air inlet port, and a pressurized air exhaust port;

[0013] The air pressure detection port and the flow meter installation port are connected to the air tightness measurement space;

[0014] The pressurized air inlet and the pressurized air exhaust are connected to the air pressure loading space;

[0015] The upper cover plate is connected to the upper U-shaped skirt;

[0016] The lower cover plate is connected to the lower U-shaped skirt.

[0017] Optionally, in the above-mentioned device for measuring air tightness of an inclined airtight floor in an aircraft floor structure, the airtight box is integrally formed by forging of Q345;

[0018] The upper cover is forged from Q345;

[0019] The lower cover is forged from Q345.

[0020] Optionally, in the above-mentioned device for measuring air tightness of the inclined airtight floor in the aircraft floor structure, the thickness of the area where the air tightness measurement installation edge is connected to the inclined airtight floor is 3 mm;

[0021] Air tightness measurement: The contact area between the installation edge and the inclined airtight floor retains a width of 60mm;

[0022] The width of the upper round skirt is 60mm;

[0023] The lower U-shaped skirt is 60mm wide.

[0024] Optionally, in the above-mentioned air tightness measuring device for the inclined airtight floor in the aircraft floor structure, polytetrafluoroethylene of the same width is pasted on the air tightness measurement installation edge and the contact area on the inclined airtight floor.

[0025] Optionally, the above-mentioned device for measuring air tightness of an inclined airtight floor in an aircraft floor structure further includes two sealing pads, which are respectively installed between the upper cover plate and the upper U-shaped skirt and between the lower cover plate and the lower U-shaped skirt.

[0026] A method for measuring air tightness of an inclined airtight floor in an aircraft floor structure is implemented based on the air tightness measuring device for an inclined airtight floor in an aircraft floor structure disclosed in the above embodiment, comprising:

[0027] Assemble the inclined airtight floor to the airtight box;

[0028] Place the lower cover plate flat on the ground, place the corresponding sealing gasket on the lower cover plate, and install the U-shaped skirt of the airtight box with the lower cover plate;

[0029] Place the sealing gasket on the U-shaped skirt of the airtight box, and install the upper cover plate on the U-shaped skirt;

[0030] Install an air pressure detection device at the air pressure detection port on the airtight box, install a flow meter at the flow meter installation port, install a pressurized air intake device at the pressurized air intake port, and install a pressurized air exhaust device at the pressurized air exhaust port;

[0031] The pressure in the air pressure loading space is controlled by a pressurized air intake device and a pressurized air exhaust device to apply the required air pressure load to the inclined airtight floor, and the air tightness of the inclined airtight floor is detected by an air pressure detection device and a flow meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic diagram of an air tightness measuring device for an inclined airtight floor in an aircraft floor structure provided by an embodiment of the present application;

[0033] Figure 2 is a three-dimensional view of an airtight box provided in an embodiment of the present application;

[0034] Figure 3 is a front view of the airtight box provided in an embodiment of the present application in the Y direction;

[0035] Figure 4 is a cross-sectional view of the airtight box provided in an embodiment of the present application along the X direction;

[0036] Figure 5 is a schematic diagram of an upper cover plate provided in an embodiment of the present application;

[0037] Figure 6 is a schematic diagram of a sealing gasket provided in an embodiment of the present application;

[0038] in:

[0039] 1-airtight box; 2-upper cover; 3-lower cover; 4-sealing gasket;

[0040] A-airtightness measurement space; B-air pressure loading space;

[0041] C-air pressure detection port; D-flow meter installation port;

[0042] E-pressurized air inlet; F-pressurized air outlet.

[0043] In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. In addition, the drawings are only used for illustrative purposes and should not be construed as limitations on the present application. DETAILED DESCRIPTION

[0044] In order to make the technical solution and advantages of the present application clearer, the technical solution of the present application will be described in further detail in detail and in detail with reference to the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present application, which are only used to explain the present application, not to limit the present application. It should be noted that, for the convenience of description, only the parts related to the present application are shown in the accompanying drawings, and other related parts can refer to the general design.

[0045] In addition, unless otherwise defined, the technical terms or scientific terms used in the description of this application shall have the usual meanings understood by those of ordinary skill in the art to which this application belongs. The words used in the description of this application to indicate orientation are only used to indicate relative directions or positional relationships. When the absolute position of the described object changes, its relative positional relationship may also change accordingly. The word "include" used in the description of this application indicates that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, but does not exclude other elements or objects.

[0046] In addition, it should be noted that, unless otherwise clearly specified and limited, the words "installation", "connection" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Technical personnel in the field can understand its specific meaning in this application according to the specific circumstances.

[0047] On the one hand, an embodiment of the present application provides an air tightness measuring device for an inclined airtight floor in an aircraft floor structure, such as Figure 1 As shown, it includes an airtight box 1, an upper cover plate 2, a lower cover plate 3, and a sealing gasket 4. Figure 1 In the middle coordinate system, the origin of the coordinate is located at the bottom symmetry center, the XY plane is a horizontal plane, the X axis is along the length direction of the inclined airtight floor long stringer, the Y axis is along the width direction of the inclined airtight floor, and the Z axis points vertically upward to the skin direction.

[0048] The airtight box 1 is formed by forging Q345 in one piece, with an airtightness measurement installation edge 5 on the inner side, openings at the upper and lower ends, and an upper U-shaped skirt edge and a lower U-shaped skirt edge on the outer walls of the upper and lower ends, respectively. Figure 2 shown.

[0049] The airtightness measurement installation edge 5 is used to install the inclined airtight floor. It is designed according to the size, shape and bolt parameters of the inclined airtight floor and connected to the installed inclined airtight floor by bolts. The thickness of the area where the airtightness measurement installation edge 5 connects to the inclined airtight floor is designed to be 3mm to ensure that the stiffness of the fixture and the actual force-bearing structure of the aircraft is the same, and the airtightness measurement installation edge 5 is designed to retain a width of 60mm in the contact area with the inclined airtight floor to meet the coordinated deformation of the inclined airtight floor under air pressure load. When installing the inclined airtight floor, stick polytetrafluoroethylene of the same width on the airtightness measurement installation edge 5 and the contact area on the inclined airtight floor in advance to accurately simulate the airtight conditions of the actual installed parts.

[0050] The part above the airtightness measurement installation edge 5 in the airtight box 1 is the airtightness measurement space A, and the part below is the air pressure loading space B. Figure 3-Figure 4 shown.

[0051] The airtight box 1 has an air pressure detection port C and a flow meter installation port D on a side wall in the X direction. The air pressure detection port C and the flow meter installation port D are connected to the air tightness measurement space A, wherein the air pressure detection port C is used to install an air pressure detection device, specifically, a flange can be welded to install the air pressure detection device; the flow meter installation port D is used to install a flow meter.

[0052] The airtight box 1 has a pressurized air inlet E and a pressurized air exhaust F on the two side walls in the X direction. The pressurized air inlet E and the pressurized air exhaust F are connected to the air pressure loading space B, wherein the pressurized air inlet E is used to install a pressurized air inlet device, specifically a flange plate can be welded to install the pressurized air inlet device; the pressurized air exhaust F is used to install a pressurized air exhaust device, specifically a flange plate can be welded to install the pressurized air exhaust device.

[0053] The airtight box 1 has two lifting rings on the two side walls in the X direction, respectively, to facilitate lifting and fixture installation during replacement.

[0054] The upper cover plate 2 is forged from Q345. Figure 5 As shown, it is connected to the upper U-shaped skirt, and can be connected by multiple M10 bolts distributed along the circumference. The outer wall of the upper cover plate 2 has 4 lifting rings, which are convenient for lifting and fixture installation during replacement. The upper U-shaped skirt is 60mm wide, so that it can have a large contact area with the upper cover plate 2 to ensure the sealing of the airtight measurement space A.

[0055] The lower cover plate 3 is forged from Q345 and connected to the lower U-shaped skirt, which can be connected by multiple M10 bolts distributed along the circumference. The lower U-shaped skirt is 60mm wide, so that it can have a large contact area with the lower cover plate 3 to ensure the sealing of the air pressure loading space B.

[0056] There are two sealing pads 4, such as Figure 6 As shown, they are installed between the upper cover plate 2 and the upper U-shaped skirt and between the lower cover plate 3 and the lower U-shaped skirt, respectively. The sizes are kept consistent with the upper U-shaped skirt and the lower U-shaped skirt. During the installation process, all bolts can be tightened with the same torque as required, and the sealing gasket 4 can be compressed along the Z direction by a certain deformation amount to ensure that there is no leakage during the loading process, and sealed with sealant to prevent falling off and ensure air tightness.

[0057] The air tightness measuring device for the inclined airtight floor in the aircraft floor structure disclosed in the above embodiment is used to measure the air tightness of the inclined airtight floor, which can be specifically performed with reference to the air tightness measuring method for the inclined airtight floor in the aircraft floor structure disclosed below.

[0058] a. Assemble the inclined airtight floor to the airtight box 1. During assembly, adjust the drag plate nuts on the inclined airtight floor to align with the bolt holes on the airtightness measurement installation edge 5, and tighten all the restraining bolts to a torque of 2.5 N·m.

[0059] b. Assemble the M10 bolts on the lower cover 3 and lay it flat on the ground. Then place the corresponding gasket 4 on the lower cover 3 according to the bolt position. Then install the lower U-shaped skirt of the airtight box 1 with the lower cover 3, tighten the corresponding M10 bolts, and ensure that the tightening torque of all M10 bolts is the same. Apply a certain pressure to the gasket 4 through the M10 bolts to make the gasket 4 fully contact with the lower cover 3 and the lower U-shaped skirt to ensure the sealing performance.

[0060] c. Place the sealing gasket 4 on the U-shaped skirt of the airtight box 1 according to the bolt position, and then install the upper cover plate 2 to the upper U-shaped skirt through M10 bolts. Adjust and ensure the tightening torque of the M10 bolts so that the sealing gasket 4 has a certain degree of compression deformation, and seal with sealant to ensure the sealing performance.

[0061] d. Install an air pressure detection device at the air pressure detection port C on the air-tight box 3, install a flow meter at the flow meter installation port D, install a pressurized air intake device at the pressurized air inlet E, and install a pressurized air exhaust device at the pressurized air exhaust port F. Then, the pressure in the air pressure loading space B can be controlled by the pressurized air intake device and the pressurized air exhaust device, so as to apply the required air pressure load to the inclined air-tight floor, and the air tightness of the inclined air-tight floor can be obtained by detecting the air pressure detection device and the flow meter.

[0062] The device and method for measuring air tightness of an inclined airtight floor in an aircraft floor structure disclosed in the above embodiment have the following technical effects:

[0063] The airtight box 1 is processed by an integrated molding process, and an airtight measurement installation edge 5 is provided on the airtight box 1 for installing an inclined airtight floor, and the airtight box 1 is divided into two independent spaces, namely, an airtight measurement space A and an air pressure loading space B, so as to achieve the stability of gas pressurization and accurate measurement of leakage;

[0064] The design simulates the air pressure load by filling and releasing air into the air pressure loading space B in the airtight box 1, and loads the inclined airtight floor. This can apply uniform air pressure to the long stringer surface of the inclined airtight floor, and transfer the reaction force of the air pressure to the long stringer, web and skin side more evenly, highly restoring the actual stress condition of the inclined airtight floor.

[0065] The design measures the air tightness of the inclined airtight floor by detecting the air pressure and its discharge in the airtightness measurement space A. The leaked gas can be accurately measured by the flow meter. The flow meter connects the airtightness measurement space A and the atmospheric environment. It can be basically considered that the air pressure of the two is equal.

[0066] The design uses easily deformable rubber materials for sealing, which can ensure that there will be no leakage due to inconsistent deformation between structures during the loading process, so that higher air pressure loads can be applied;

[0067] The uniformly distributed bolt arrangement ensures the tightness of the gas pressure load and its airtight measurement.

[0068] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the scope of protection of the present application.

Claims

1. An air tightness measuring device for an inclined airtight floor in an aircraft floor structure, characterized in that: It comprises an airtight box (1), an upper cover plate (2), and a lower cover plate (3); The airtight box (1) has an airtightness measurement installation edge (5) on the inner side, with openings at the upper and lower ends, and an upper U-shaped skirt edge and a lower U-shaped skirt edge on the outer walls of the upper and lower ends respectively; The airtightness measurement installation edge (5) is used to install the inclined airtight floor; The portion of the airtight box (1) located above the airtight measurement installation edge (5) is an airtight measurement space (A), and the portion below is an air pressure loading space (B); The side wall of the airtight box (1) is provided with an air pressure detection port (C), a flow meter installation port (D), a pressurized air inlet port (E), and a pressurized air outlet port (F); The air pressure detection port (C) and the flow meter installation port (D) are connected to the air tightness measurement space (A); The pressurized air inlet (E) and the pressurized air exhaust port (F) are connected to the air pressure loading space (B); The upper cover plate (2) is connected to the upper U-shaped skirt; The lower cover plate (3) is connected to the lower U-shaped skirt.

2. The device for measuring air tightness of an inclined airtight floor in an aircraft floor structure according to claim 1, characterized in that: The airtight box (1) is forged in one piece from Q345; The upper cover plate (2) is forged from Q345; The lower cover plate (3) is forged from Q345.

3. The device for measuring air tightness of an inclined airtight floor in an aircraft floor structure according to claim 2, characterized in that: The thickness of the area where the airtightness measurement installation edge (5) connects to the inclined airtight floor is 3mm; The airtightness measurement installation edge (5) has a 60mm width in the contact area with the inclined airtight floor; The width of the upper round skirt is 60mm; The lower U-shaped skirt is 60mm wide.

4. The device for measuring air tightness of an inclined airtight floor in an aircraft floor structure according to claim 3, characterized in that: The air tightness measurement installation edge (5) and the contact area of ​​the inclined air tight floor are pasted with polytetrafluoroethylene of the same width.

5. The device for measuring air tightness of an inclined airtight floor in an aircraft floor structure according to claim 4, characterized in that: It also includes two sealing pads (4), which are respectively installed between the upper cover plate (2) and the upper U-shaped skirt and between the lower cover plate (3) and the lower U-shaped skirt.

6. A method for measuring the air tightness of an inclined airtight floor in an aircraft floor structure, implemented based on the device for measuring the air tightness of an inclined airtight floor in an aircraft floor structure according to claim 5, characterized in that: include: Assembling the inclined airtight floor onto the airtight box (1); Place the lower cover plate (3) flat on the ground, place the corresponding sealing pad (4) on the lower cover plate (3), and install the U-shaped skirt of the airtight box (1) on the lower cover plate (3); Place the sealing gasket (4) on the U-shaped skirt edge of the airtight box (1), and install the upper cover plate (2) on the U-shaped skirt edge; An air pressure detection device is installed at the air pressure detection port (C) on the airtight box (3), a flow meter is installed at the flow meter installation port (D), a pressurized air inlet device is installed at the pressurized air inlet (E), and a pressurized air exhaust device is installed at the pressurized air exhaust port (F); The pressure in the air pressure loading space (B) is controlled by a pressurized air intake device and a pressurized air exhaust device to apply the required air pressure load to the inclined airtight floor, and the air tightness of the inclined airtight floor is detected by an air pressure detection device and a flow meter.

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