An aircraft interior air makeup overflow duct and method of installation

Abstract

The application discloses an aircraft internal air supplement overflow pipeline and a mounting method, which comprises a bottom support assembly, a pipe bending assembly, a curved pipe assembly and a top support assembly which are sequentially connected and internally communicated; the bottom end of the bottom support assembly is used for connecting a water tank, the bottom support assembly is vertically arranged, the bottom end of the pipe bending assembly is connected to the bottom support assembly, the top end of the pipe bending assembly is bent to be horizontally and downwardly deviated and connected to the curved pipe assembly, the axis of the curved pipe assembly has a height difference, the height of one end connected to the pipe bending assembly is higher than that of the other end, the end of the top support assembly is used for connecting the inner wall of a fuselage, and the top support assembly is communicated to the outside of an aircraft after being connected. The application can supplement air for the water tank, prevent the water tank from overflowing and increase the speed of medium discharge in the water tank.

Description

Technical Field

[0001] This invention belongs to the field of aircraft structure and relates to an internal air supply overflow pipe for aircraft and its installation method. Background Technology

[0002] Firefighting aircraft rely on water tanks and piping structures to store and release extinguishing media for firefighting operations. Since firefighting aircraft often need to carry extinguishing media in water tanks to achieve their firefighting missions, currently, the water tanks only have water level measurement holes at the top. When water is added to the tank, overflow is likely to occur, spilling out from the water level measurement holes and affecting the aircraft's interior. Furthermore, the air inside the water tank cannot be expelled, and the water tank is only connected to the outside of the aircraft through the outlet. Air cannot be replenished when draining water, resulting in slow drainage speed, which is not conducive to firefighting operations. In addition, the lack of air inside the water tank can easily lead to pressure deformation. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an internal air replenishment and overflow pipe and installation method for an aircraft, which can replenish and vent air from the water tank, prevent water tank overflow, and accelerate the discharge of media from the water tank.

[0004] To achieve the above objectives, the present invention employs the following technical solution:

[0005] An internal air supply overflow duct for an aircraft includes a bottom support assembly, a folded pipe assembly, a curved pipe assembly, and a top support assembly that are connected in sequence and internally interconnected.

[0006] The bottom support assembly is used to connect the water tank at the bottom end. The bottom support assembly is set vertically. The bottom end of the folded tube assembly is connected to the bottom support assembly. The top end is bent to the horizontal and slightly lower and connected to the curved tube assembly. There is a height difference between the axes of the curved tube assembly and the end connected to the folded tube assembly is higher than the other end. The end of the top support assembly is used to connect to the inner wall of the fuselage. After connection, the top support assembly is connected to the outside of the aircraft.

[0007] Preferably, the bottom support assembly includes a first support member and a first annular member. The first support member is a cylindrical structure with its bottom for connection to the water tank. It has external threads on its exterior and an axial boss on its inner bottom wall. The outer diameter of the first annular member is equal to the inner diameter of the first support member. It has multiple axial bosses on its bottom and is located inside the first support member. The bosses of the first annular member and the first support member abut against each other.

[0008] The tube bending assembly includes a tube bending, with a first outer nut and a first flat nozzle nested at the bottom of the tube bending. The first outer nut is axially slidably disposed with the tube bending. The top of the first outer nut is provided with a radially inward annular boss, and the bottom of the first flat nozzle is provided with a radially outward annular boss. The two annular bosses abut against each other. The bottom of the first outer nut is threadedly connected to the first support member, and the bottom end of the tube bending is interference-fitted with the top end of the first annular member.

[0009] The curved tube assembly includes a curved tube, one end of which is fixedly connected to a folded tube, and the other end is nested with a second flat tube nozzle and a second outer sleeve nut. The second outer sleeve nut is slidably disposed with the curved tube. The structure and connection method of the second outer sleeve nut and the second flat tube nozzle are the same as those of the first outer sleeve nut and the first flat tube nozzle.

[0010] The top support assembly includes a second annular component, a second support component, and a flange joint. The flange joint is used for fixed connection with the inner wall of the machine body. One end of the second support component is fixedly connected to the flange joint. The other end of the second support component has an axial boss inside and an external thread outside. The second annular component has the same structure as the first annular component. The outer diameter of the second annular component is equal to the inner diameter of the second support component. The second annular component is located inside the second support component, and the bosses abut against each other. The second outer sleeve nut is threadedly connected to the second support component. The curved tube end is interference-fitted with the second annular component.

[0011] Furthermore, protrusions are evenly distributed around the top of both the first and second annular components.

[0012] Furthermore, the curved tube assembly and the folded tube assembly are riveted together.

[0013] Furthermore, the curvature of the flange joint is consistent with the curvature of the fuselage.

[0014] Furthermore, flared openings are provided at the bottom of the folded tube and at the outer edge of the curved tube where they meet the second annular component, and chamfers are provided at the top of both the first and second annular components.

[0015] Furthermore, the bottom of the first support extends radially outward into a flat ring.

[0016] An installation method for an internal air supply overflow pipe for an aircraft, wherein the bottom of a bottom support assembly is connected to the water tank opening, and the other end is connected to a folded pipe assembly via a threaded connection. The other end of the folded pipe assembly is connected to a curved pipe assembly, the tail of the curved pipe assembly is connected to a top support assembly, and the top support assembly is connected to the inner wall of the fuselage.

[0017] Preferably, the end of the curved pipe with the higher height is fixedly connected to the folded pipe, the flat ring of the first support member is fixed to the top of the water tank with bolts, and the flange joint is fixedly connected to the machine body.

[0018] Place the first annular component inside the first support component, and abut the bosses of the first annular component and the first support component together; fit the first outer nut and the first flat nozzle onto the bottom of the folded tube, thread the bottom of the first outer nut to the first support component, abut the annular boss at the top of the first outer nut to the annular boss at the bottom of the first flat nozzle, and press the bottom of the folded tube against the top of the first annular component.

[0019] Place the second annular component inside the second support component, and abut the bosses of the second annular component and the second support component together; put the second flat nozzle and the second outer nut on the lower end of the curved pipe, the second outer nut is threaded to the second support component, the annular boss of the second outer nut abuts and seals with the annular boss of the second flat nozzle, and the curved pipe is interference-fitted with the second annular component.

[0020] Finally, based on the horizontal position of the overall pipeline, the flange joint and the second support are connected by rivets.

[0021] Furthermore, when it is necessary to disassemble the pipe, the first outer nut is rotated to separate it from the first support member, and the first annular member is rotated until the boss of the first annular member corresponds to the groove of the first support member. The boss of the first annular member is inserted into the groove of the first support member, thereby separating the first annular member from the folded pipe. The curved pipe and the folded pipe are then pulled out horizontally from the second support member along with the second annular member, completing the disassembly.

[0022] Alternatively, the curved tube can be separated from the second annular component in the same way, and then the curved tube and the folded tube can be vertically pulled out from the first support component along with the first annular component to complete the disassembly.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] This invention completes the pipe structure within the confined space of an aircraft. By bending the top of the bend assembly to a slightly lower horizontal position, and with a height difference between the axes of the bend assembly and the other end, the water level in the tank is higher than the bend assembly's corner. Therefore, when the water level in the tank is higher than the bend assembly's corner, the water will flow through the bend assembly and the top support to the outside of the fuselage. It can also expel air from the water tank during water filling. This invention enables the connection between equipment at different height differences and in different directions, and the top support assembly connects to the outside of the aircraft to replenish air inside the water tank, thereby improving the drainage speed during firefighting.

[0025] Furthermore, the two annular parts are fixed by abutting against the two support protrusions. During disassembly, it is only necessary to rotate the annular parts until the annular protrusions align with the support grooves, and then insert the annular protrusions into the support grooves to separate them. Installation and disassembly are quick and easy, facilitating pipe cleaning. Attached Figure Description

[0026] Figure 1 A schematic diagram of the gas replenishment overflow pipeline;

[0027] Figure 2 Exploded view of the gas overflow pipeline structure;

[0028] Figure 3 Schematic diagram of the assembly relationship of the gas replenishment overflow pipeline components;

[0029] Figure 4 This is a schematic diagram of the bottom support component structure;

[0030] Figure 5 This is a schematic diagram of the tube bending assembly structure;

[0031] Figure 6 This is a schematic diagram of the curved pipe assembly structure;

[0032] Figure 7 This is a schematic diagram of the top support component structure;

[0033] Figure 8 This is a schematic diagram showing the installation of the air replenishment overflow pipe with the machine body and water tank.

[0034] Wherein: 1-First rubber ring, 2-First support member, 3-First annular member, 4-Second rubber ring, 5-First outer nut, 6-First flat nozzle, 7-Third rubber ring, 8-Bend pipe, 9-Curved pipe, 10-Second flat nozzle, 11-Sealing strip, 12-Second outer nut, 13-Second annular member, 14-Sealing member, 15-Second support member, 16-Flange joint. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0036] It should be noted that the terms “front,” “back,” “left,” “right,” “up,” and “down” used in the following description refer to the directions shown in the attached diagrams, while the terms “inner” and “outer” refer to the directions toward or away from the geometric center of a specific component, respectively.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] The aircraft internal air replenishment overflow pipe structure described in this application is located inside the aircraft fuselage. The pipe structure is used to connect to the equipment interface inside the aircraft fuselage. One end of the pipe structure is connected to the water tank and the other end is connected to the inner wall of the fuselage using rivets. Figure 1 The image shows the state of the entire pipeline equipment after installation.

[0039] like Figure 2 and 3 As shown, the overall structure of the pipeline includes a bottom support assembly, a bend assembly, a curved pipe assembly, and a top support assembly that are connected in sequence and internally interconnected. The bottom support assembly is connected to the water tank and communicates with the inside of the water tank, while the top support assembly is connected to the inner wall of the machine body.

[0040] The bottom support assembly is vertically oriented. The bottom end of the bend assembly is connected to the bottom support assembly, and the top end is bent slightly downwards to a horizontal position and connected to the curved pipe assembly. There is a height difference between the axes of the curved pipe assembly and the end connected to the bend assembly; the end connected to the curved pipe assembly is higher than the end connected to the top support assembly. When the water level in the tank is higher than the bend corner, water flows through the curved pipe assembly and the top support assembly, and is then discharged to the outside of the machine body. The bottom of the bottom support assembly is connected to the opening of a pipe or connecting carrier. In this embodiment, the bottom of the bottom support assembly is connected to the water tank opening, and the other end is connected to the bend assembly via a threaded connection. The other end of the bend assembly is connected to the curved pipe assembly, and the tail of the curved pipe assembly is connected to the top support assembly. These components are sequentially connected to the inside of the machine body, thus completing the connection between the components.

[0041] The bottom support assembly consists of a first rubber ring 1, a first support member 2, a first annular member 3, and a second rubber ring 4; the folded pipe assembly consists of a first outer nut 5, a first flat pipe nozzle 6, a third rubber ring 7, and a folded pipe 8; the curved pipe assembly consists of a curved pipe 9, a second flat pipe nozzle 10, a first rubber ring 11, and a second outer nut 12; and the top support assembly consists of a second annular member 13, a sealing member 14, a second support member 15, and a flange joint 16.

[0042] like Figure 3 As shown, the second support member 15 and the second outer nut 12 are threaded together, the curved tube 9 and the folded tube 8 are riveted together, and the first outer nut 5 and the first support member 2 are threaded together. Through these connections, the four components are assembled to form a complete structure. Figure 1 The usage status is shown.

[0043] like Figure 4 As shown, the bottom support assembly of the pipeline equipment consists of four parts: the first rubber ring 1, the first support 2, the first annular part 3, and the second rubber ring 4.

[0044] The first support member 2 is an annular rotating body structure with an L-shaped cross section. The top of the first support member 2 is a cylindrical ring, and the bottom extends radially outward into a flat ring. The cylindrical ring of the first support member 2 is provided with external threads for threaded connection with the first outer nut 5 in the bending assembly. The flat ring of the first support member 2 is sealed to the top of the water tank and fixed by bolts.

[0045] The first rubber ring 1 has the same inner and outer diameter as the flat circular ring. The first rubber ring 1 is assembled between the water tank and the first support member 2 to ensure the watertightness of the connection between the components.

[0046] The first annular component 3 is a cylindrical ring-shaped part. The outer diameter of the first annular component 3 is equal to the inner diameter of the first support component 2. Multiple axial bosses are provided at the bottom, and grooves are formed between adjacent bosses. An annular step is provided in the middle of the first annular component 3. The diameter of the lower half of the first annular component 3 is smaller than that of the upper half. The annular step is used to install the second rubber ring 4. The top is chamfered and protrusions are evenly distributed around it to facilitate disassembly and force application.

[0047] The inner wall of the bottom of the cylindrical ring of the first support member 2 is provided with an axial boss, and there is a groove between adjacent bosses. The bosses of the first ring member 3 and the first support member 2 are arranged opposite to each other to achieve assembly with the first ring member 3.

[0048] The first rubber ring 1 is assembled between the water tank and the first support member 2, and the first annular member 3 is attached to the folded tube 8 in the folded tube assembly, with adhesive used on the contact surface.

[0049] like Figure 5 As shown, the tube bending assembly includes a first outer nut 5, a first flat tube nozzle 6, a third rubber ring 7, and a tube bending 8.

[0050] The lower half of the tube 8 is vertically downward, while the upper half is bent horizontally downward. The lower and upper halves are then bent and shaped.

[0051] The bottom end of the folded tube 8 is flared at 74°. The first outer nut 5 is fitted onto the lower half of the folded tube 8 and is axially slidable with the folded tube 8. Tightening the first outer nut 5 provides axial force. The flared end is pressed against the chamfer at the top of the first annular part 3 by this axial force, and they overlap to form a seal. The pressing surface provides axial force, which provides continuous preload to the outer nut, thus forming a balance.

[0052] The bottom end of the folded tube 8 is nested with the first flat tube nozzle 6. The bottom of the first flat tube nozzle 6 is provided with a radially outward annular boss. The top of the first outer nut 5 is provided with a radially inward annular boss. The bottom of the first outer nut 5 is threadedly connected to the cylindrical ring of the first support member 2. The annular boss at the top abuts against and seals the bottom annular boss of the first flat tube nozzle 6 through the third rubber ring 7.

[0053] During implementation, before assembling the folded pipe 8, the first outer nut 5, the first flat pipe nozzle 6, and the third rubber ring 7 are placed inside the port. After assembling the first outer nut 5 and the first flat pipe nozzle 6, the assembly of the folded pipe assembly is completed.

[0054] like Figure 6 As shown, the curved tube assembly consists of a curved tube 9, a second flat nozzle 10, a sealing strip 11, and a second outer nut 12. After assembling the curved tube 9, the second flat nozzle 10, the sealing strip 11, and the second outer nut 12, the outer edge of the curved tube 9 is flared at 74° at the junction with the second annular part 13.

[0055] The curved pipe 9 is made of tubing material, which is then bent and shaped. After assembling the second outer nut 12 and the second flat nozzle 10, it is flared at 74°. The second outer nut 12 is threaded, which mates with the thread on the second support member 15 in the top support assembly.

[0056] The curved pipe 9 has a longitudinal height difference, which meets the passage requirements. One end of the curved pipe 9 is higher than the other end when it connects to the bend pipe 8. The inner diameter of the interface between the curved pipe 9 and the bend pipe 8 varies. The edge of the curved pipe 9 is riveted to the bend pipe assembly. The wall of the curved pipe 9 transitions smoothly along the axis. After the assembly of the second flat nozzle 10, the second outer nut 12, and the sealing strip 11 is completed, the opening is flared.

[0057] The second flat nozzle 10 and the second outer nut 12 have the same structure and connection as the first flat nozzle 6 and the first outer nut 5, and a sealing strip 11 is provided between them.

[0058] like Figure 7 As shown, the top support assembly consists of four parts: a second annular member 13, a sealing element 14, a second support member 15, and a flange joint 16. The sealing element 14 is placed between the grooves of the second annular member 13 and the second support member 15. The second annular member 13 has the same structure as the first annular member 3, with its outer diameter equal to the inner diameter of the second support member 15. One end of the second support member 15 connected to the second annular member 13 has an axial boss inside, with grooves between adjacent bosses and external threads. The sealing element 14 is located between the second support member 15 and the second annular member 13. The flange joint 16 is connected to the second support member 15 by rivets. The horizontal position of the overall pipeline is adjusted by varying the rivet connection positions. The curvature of the flange joint 16 is set to match the curvature of the machine body at this location, and it is riveted to the machine body.

[0059] The process of connecting the above-mentioned pipes to the machine body and water tank is as follows:

[0060] Rivet the higher end of the curved pipe 9 to the folded pipe 8; fix the flat ring of the first support member 2 to the top of the water tank with bolts, and seal it reliably with the first rubber ring 1; rivet the flange joint 16 to the machine body.

[0061] The second rubber ring 4 is assembled onto the annular step of the first annular member 3. The assembled first annular member 3 is placed inside the first support member 2, and the first annular member 3 and the boss of the first support member 2 abut against each other.

[0062] The first outer nut 5, the first flat nozzle 6, and the third rubber ring 7 are nested at the bottom of the folded tube 8. The bottom of the first outer nut 5 is threadedly connected to the cylindrical ring of the first support member 2. The annular boss at the top abuts against and seals the bottom annular boss of the first flat nozzle 6 through the third rubber ring 7. The flared end at the bottom of the folded tube 8 presses against the chamfer at the top of the first annular member 3 and overlaps to form a seal.

[0063] The sealing element 14 is assembled onto the annular step of the second annular element 13. The assembled second annular element 13 is placed inside the second support element 15, and the protrusions of the second annular element 13 and the second support element 15 abut against each other.

[0064] The second flat nozzle 10, sealing strip 11, and second outer nut 12 are nested at the lower end of the curved pipe 9. The second outer nut 12 is threadedly connected to the second support member 15. The annular boss of the second outer nut 12 abuts against and seals the annular boss of the second flat nozzle 10 through the sealing strip 11. The flared end of the curved pipe 9 presses against the chamfer of the second annular member 13 and overlaps to form a seal.

[0065] Finally, based on the horizontal position of the overall pipeline, the flange joint 16 and the second support member 15 are connected by rivets. The structure after connection is as follows. Figure 8 As shown.

[0066] When it is necessary to disassemble the pipe, rotate the first outer nut 5 to separate it from the first support member 2, rotate the first annular member 3 until the boss of the first annular member 3 corresponds to the groove of the first support member 2, insert the boss of the first annular member 3 into the groove of the first support member 2, thereby separating the first annular member 3 from the folded pipe 8, and pull the curved pipe 9 and the folded pipe 8 horizontally out of the second support member 15 along with the second annular member 13 to complete the disassembly.

[0067] Alternatively, the curved tube 9 can be separated from the second annular component 13 in the same way, and then the curved tube 9 and the folded tube 8 can be vertically pulled out from the first support component 2 along with the first annular component 3 to complete the disassembly. Choose the most convenient method according to the actual situation.

[0068] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0069] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and applications beyond the provided examples will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this teaching should not be determined by reference to the above description, but rather by reference to the foregoing claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended as a waiver of that subject matter, nor should it be construed as an indication that the applicant has not considered that subject matter as part of the disclosed inventive subject matter.

Claims

1. An internal air supply overflow pipe for an aircraft, characterized in that, It includes a bottom support assembly, a folded tube assembly, a curved tube assembly, and a top support assembly that are connected in sequence and internally interconnected; The bottom support assembly is used to connect the water tank at the bottom end. The bottom support assembly is set vertically. The bottom end of the folded tube assembly is connected to the bottom support assembly. The top end is bent to the horizontal and slightly lower and connected to the curved tube assembly. There is a height difference between the axes of the curved tube assembly and the end connected to the folded tube assembly is higher than the other end. The end of the top support assembly is used to connect to the inner wall of the fuselage. After connection, the top support assembly is connected to the outside of the aircraft. The bottom support assembly includes a first support member (2) and a first annular member (3). The first support member (2) is a cylindrical structure, with the bottom for connection to the water tank. It has external threads on the outside and axial bosses on the inner wall of the bottom. The outer diameter of the first annular member (3) is equal to the inner diameter of the first support member (2). It has multiple axial bosses on the bottom. The first annular member (3) is located inside the first support member (2), and the bosses of the first annular member (3) abut against the bosses of the first support member (2). The tube bending assembly includes a tube bending (8), with a first outer nut (5) and a first flat nozzle (6) nested at the bottom of the tube bending (8). The first outer nut (5) and the tube bending (8) are axially slidably disposed. The top of the first outer nut (5) is provided with a radially inward annular boss, and the bottom of the first flat nozzle (6) is provided with a radially outward annular boss. The two annular bosses abut against each other. The bottom of the first outer nut (5) is threadedly connected to the first support member (2), and the bottom end of the tube bending (8) is interference-fitted with the top end of the first annular member (3). The curved tube assembly includes a curved tube (9), one end of which is fixedly connected to a folded tube (8), and the other end is nested with a second flat nozzle (10) and a second outer nut (12). The second outer nut (12) is slidably disposed with the curved tube (9). The structure and connection method of the second outer nut (12) and the second flat nozzle (10) are the same as those of the first outer nut (5) and the first flat nozzle (6). The top support assembly includes a second annular part (13), a second support part (15), and a flange joint (16). The flange joint (16) is used to fix the connection to the inner wall of the machine body. One end of the second support part (15) is fixedly connected to the flange joint (16). The other end of the second support part (15) has an axial boss inside and an external thread outside. The second annular part (13) has the same structure as the first annular part (3). The outer diameter of the second annular part (13) is equal to the inner diameter of the second support part (15). The second annular part (13) is located inside the second support part (15), and the bosses abut against each other. The second outer nut (12) is threadedly connected to the second support part (15). The end of the curved pipe (9) is interference-fitted with the second annular part (13).

2. The aircraft internal air replenishment overflow pipe according to claim 1, characterized in that, The top of the first annular component (3) and the second annular component (13) are uniformly distributed with protrusions around the perimeter.

3. The aircraft internal air replenishment overflow pipe according to claim 1, characterized in that, The curved pipe assembly and the folded pipe assembly are riveted together.

4. The aircraft internal air replenishment overflow pipe according to claim 1, characterized in that, The curvature of the flange joint (16) is consistent with that of the fuselage.

5. The aircraft internal air replenishment overflow pipe according to claim 1, characterized in that, The bottom of the folded tube (8) and the outer edge of the curved tube (9) where they meet the second annular part (13) are both provided with flared openings, and the tops of the first annular part (3) and the second annular part (13) are both provided with chamfers.

6. The aircraft internal air replenishment overflow pipe according to claim 1, characterized in that, The bottom of the first support member (2) extends radially outward into a flat ring.

7. A method for installing an internal air supply overflow pipe for an aircraft as described in any one of claims 1-6, characterized in that, The bottom support assembly is connected to the water tank opening at the bottom, and the other end is connected to the folded pipe assembly by a threaded connection. The other end of the folded pipe assembly is connected to the curved pipe assembly, and the tail of the curved pipe assembly is connected to the top support assembly. The top support assembly is connected to the inner wall of the machine body.

8. The installation method of the aircraft internal air replenishment overflow pipe according to claim 7, characterized in that, The higher end of the curved pipe (9) is fixedly connected to the folded pipe (8), the flat ring of the first support (2) is fixed to the top of the water tank with bolts, and the flange joint (16) is fixedly connected to the machine body. Place the first annular part (3) inside the first support part (2), and abut the boss of the first annular part (3) against the boss of the first support part (2); put the first outer nut (5) and the first flat pipe nozzle (6) on the bottom of the folded pipe (8), the bottom of the first outer nut (5) is threaded to the first support part (2), the annular boss at the top of the first outer nut (5) abuts against the annular boss at the bottom of the first flat pipe nozzle (6), and the bottom end of the folded pipe (8) is interference-fitted with the top of the first annular part (3); Place the second annular part (13) inside the second support part (15), and abut the boss of the second annular part (13) and the boss of the second support part (15) together; put the second flat pipe nozzle (10) and the second outer nut (12) on the lower end of the curved pipe (9), the second outer nut (12) is threaded to the second support part (15), the annular boss of the second outer nut (12) abuts and seals the annular boss of the second flat pipe nozzle (10), and the curved pipe (9) and the second annular part (13) are interference fit; Finally, based on the horizontal position of the overall pipeline, the flange joint (16) and the second support (15) are connected by rivets.

9. The installation method of the aircraft internal air supply overflow pipe according to claim 8, characterized in that, The first support member (2) has a groove between the adjacent bosses. When the pipe needs to be disassembled, the first outer nut (5) is rotated to separate it from the first support member (2). The first ring member (3) is rotated until the boss of the first ring member (3) corresponds to the groove of the first support member (2). The boss of the first ring member (3) is inserted into the groove of the first support member (2), thereby separating the first ring member (3) from the bent pipe (8). The curved pipe (9) and the bent pipe (8) are pulled out horizontally from the second support member (15) along with the second ring member (13) to complete the disassembly. Alternatively, the curved tube (9) and the second annular piece (13) can be separated in the same way, and then the curved tube (9) and the bent tube (8) can be vertically pulled out from the first support piece (2) along with the first annular piece (3) to complete the disassembly.

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