A welding tool for repairing a heat exchanger of an aircraft air conditioning system

Abstract

The utility model discloses a kind of welding tool for aircraft air conditioning system heat exchanger maintenance, including welding workbench, the workbench is turnover platform, both ends of the turnover platform are rotatably connected in a movable workbench, the upper surface of the turnover platform is provided with first pipe clamp, second pipe clamp and first core body support mounting seat, the other side is provided with second core body support mounting seat, the upper surface of the turnover platform is further provided with several jacks, several first flange connecting holes and several hollow holes are opened in the turnover platform, the upper surface of the turnover platform is further provided with several vertical links distributed in the first flange connecting hole and the hollow hole periphery, the upper end of the vertical link is connected with a detachable press plate, one side of the press plate is provided with several pipeline fixing seat, second flange connecting hole is opened in the press plate. The utility model can improve the welding efficiency of heat exchanger.

Description

Technical Field

[0001] This utility model relates to a welding fixture for the maintenance of heat exchangers in aircraft air conditioning systems. Background Technology

[0002] The heat exchanger in an aircraft air conditioning system is a crucial component, directly affecting the ambient temperature of the cabin and cockpit, and thus impacting passenger and pilot comfort. However, due to years of use and the poor quality of the air medium flowing through it, heat exchangers frequently experience blockages or perforations in the core and pipes, resulting in excessive pressure drop or leakage.

[0003] like Figure 1 The image shows the heat exchanger of the air conditioning system on an Airbus A330 aircraft. This heat exchanger may face the following situations during workshop maintenance:

[0004] 1. The heat exchanger components are deformed as a whole, and the core blades are corroded and fall off.

[0005] 2. Excessive pressure drop in the heat exchanger. The aircraft maintenance manual's troubleshooting method for excessive pressure drop is to clean the engine bleed air passages multiple times before performing a pressure drop test. For some severely clogged components, repeated cleaning of the core may not reduce the pressure drop to the normal range.

[0006] 3. Excessive leakage in the heat exchanger (air leakage caused by internal perforation of the heat exchanger core component). The aircraft maintenance manual's troubleshooting method for excessive leakage is: locate the leak point and fill it with sealant. Some severely leaking heat exchanger components have a repair area exceeding the 10% limit given in the CMM component maintenance manual.

[0007] In all three scenarios above, the heat exchanger needs to be disassembled and undergo a three-stage overhaul, involving replacement of relevant components or deep cleaning and maintenance before being welded back together. The core components of the heat exchanger in the Airbus A330's air conditioning system, after disassembly, include... Figures 2 to 6 As shown, the heat exchanger includes an inlet pipe 1, an outlet pipe 2, a first core 3, a second core 4, a first flange 5, and a second flange 6. To improve the maintenance efficiency of the heat exchanger, it is urgent to develop a welding fixture. Utility Model Content

[0008] The purpose of this utility model is to provide a welding fixture for the maintenance of heat exchangers in aircraft air conditioning systems, which aims to improve the welding efficiency of heat exchangers.

[0009] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0010] A welding fixture for maintaining a heat exchanger in an aircraft air conditioning system includes a welding workbench, which is a tilting platform. Both ends of the tilting platform are rotatably connected to a movable workbench frame. A first pipe clamp, a second pipe clamp, and a first core support mounting seat are provided on one side of the upper surface of the tilting platform, and a second core support mounting seat is provided on the other side. The upper surface of the tilting platform also has several top supports. The tilting platform has several first flange connection holes and several perforated holes. The upper surface of the tilting platform also has several vertical connecting rods distributed around the first flange connection holes and the perforated holes. The upper end of each vertical connecting rod is connected to a detachable pressure plate. One side of the pressure plate has several pipe fixing seats, and the pressure plate has second flange connection holes.

[0011] When the heat exchanger of the aircraft air conditioning system undergoes a three-stage overhaul, the disassembled inlet pipe, outlet pipe, first core, second core, first flange, and second flange are fixed on the welding fixture of this utility model and welded into a whole by argon arc welding. The first flange is fixedly connected to the first flange connection hole on the tilting platform by bolts. The first and second cores are lifted to a suitable height by a top support, and the first core is fixed by connecting the first core support bracket on the first core through the first core support mounting seat. The second core is fixed by connecting the second core support bracket on the second core through the second core support mounting seat. The inlet pipe is connected to the first pipe clamp, and the outlet pipe is connected to the second pipe clamp. After adjusting the positions of the inlet and outlet pipes, they are spliced ​​onto the first and second cores and await welding. The second flange is placed on the first and second cores, and then a pressure plate is placed on top of the second flange. The second flange is fixedly connected to the second flange connection hole on the pressure plate by bolts. The pressure plate is connected to the upper end of the vertical connecting rod, and the pressure plate presses the second flange onto the first and second cores. The pipe fixing seat on the pressure plate is connected to the pipe support on the outlet pipe to fix the outlet pipe. After fixing all the above parts of the heat exchanger structure with welding fixtures, the various parts are welded into a whole using argon arc welding. During welding, the angle of the flipping platform can be adjusted to facilitate welding operations. The perforated holes on the flipping platform allow welding tools or auxiliary tools to enter, making it convenient to perform welding operations from the bottom of the flipping platform.

[0012] This utility model also has the following preferred designs:

[0013] The movable workbench of this utility model is provided with two parallel vertical support parts. Each vertical support part is provided with a rotating shaft mounting seat at its upper end. A rotating shaft is mounted on the rotating shaft mounting seat. The two ends of the flipping platform are connected to the rotating shaft through swing arms. The rotating shaft is connected to a power source, which can be manually controlled or electrically controlled by a stepper motor. The rotation angle of the flipping platform can be flexibly adjusted to facilitate welding operations.

[0014] The first pipe clamp of this utility model is connected to the flipping platform through the first pipe clamp mounting seat.

[0015] The second pipe clamp of this utility model is connected to the flipping platform through the second pipe clamp mounting seat.

[0016] The first and second pipe clamp mounting seats can be connected to the flipping platform by bolts.

[0017] The top support of this utility model is a liftable top support, thereby adjusting the height of the first core and the second core. The liftable top support is connected to the tilting platform by an adjustable threaded rod.

[0018] The movable workbench of this invention is equipped with lockable casters at its bottom, allowing the workbench to move in accordance with the welding position for convenient welding operations.

[0019] This utility model has the following beneficial effects:

[0020] The welding fixture of this utility model can fix the various parts of the heat exchanger structure, ensuring that the parts do not shift relative to each other. During the welding process, the angle of the flipping platform can be adjusted according to the welding position. At the same time, the hollow holes opened on the flipping platform provide a larger operating space for welding, thereby enabling operators to perform multi-angle welding in a smaller work position and improving welding efficiency. Attached Figure Description

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0022] Figure 1 This is an external structural diagram of an aircraft air conditioning heat exchanger as described in the embodiment;

[0023] Figure 2 for Figure 1 An exploded view of the heat exchanger, including the inlet pipe, outlet pipe, first core, and second core.

[0024] Figure 3 for Figure 1 A structural diagram of the first flange on a heat exchanger;

[0025] Figure 4 for Figure 1 A structural diagram of the second flange on a heat exchanger;

[0026] Figure 5 for Figure 1 Left view of the heat exchanger in its decomposed state;

[0027] Figure 6 for Figure 1 Right view of the heat exchanger in its decomposed state;

[0028] Figure 7 This is a front view of a welding fixture for repairing an aircraft air conditioning heat exchanger according to the present invention.

[0029] Figure 8 yes Figure 7 A top view of the welding fixture after the pressure plate has been removed;

[0030] Figure 9 yes Figure 7 The left view of the welding fixture, the structure of which is not shown;

[0031] Figure 10 yes Figure 1 A top view of the various structural components of an aircraft air conditioning heat exchanger being installed on welding fixtures.

[0032] Figure 11 yes Figure 10 The left view;

[0033] Figure 12 yes Figure 10 The right view.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Inlet pipe; 2. Outlet pipe; 3. First core; 4. Second core; 5. First flange; 6. Second flange; 7. First core support; 8. Second core support; 9. Pipe support; 10. Movable workbench; 11. Vertical support; 12. Rotary shaft mounting base; 13. Rotary shaft; 14. Swing arm; 15. Tilting platform; 16. First pipe clamp; 17. Second pipe clamp; 18. Top support; 19. First core support mounting base; 20. Second core support mounting base; 21. Pressure plate; 22. Pipe fixing base; 23. Power source; 24. Casters; 25. First flange connection hole; 26. Hollow hole; 27. Vertical connecting rod; 28. First pipe clamp mounting base; 29. ​​Second pipe clamp mounting base. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this utility model more apparent, exemplary embodiments according to this utility model will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this utility model, and not all embodiments of this utility model. It should be understood that this utility model is not limited to the exemplary embodiments described herein. Based on the embodiments of this utility model described herein, all other embodiments obtained by those skilled in the art without inventive effort should fall within the protection scope of this utility model.

[0037] It should be understood that this invention can be embodied in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of this invention to those skilled in the art.

[0038] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. When used herein, the singular forms “a,” “an,” and “the” are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0039] Combination Figures 7 to 9 As shown, a welding fixture for maintaining a heat exchanger in an aircraft air conditioning system includes a welding workbench, which is a tilting platform 15. Both ends of the tilting platform 15 are rotatably connected to a movable workbench frame 10. A first pipe clamp 16, a second pipe clamp 17, and a first core support mounting seat 19 are provided on one side of the upper surface of the tilting platform 10, and a second core support mounting seat 20 is provided on the other side. Several top supports 18 are also provided on the upper surface of the tilting platform 15. Several first flange connection holes 25 and several hollow holes 26 are provided on the tilting platform 15. Several vertical connecting rods 27 are also provided on the upper surface of the tilting platform 15, distributed around the first flange connection holes 25 and hollow holes 26. A detachable pressure plate 21 is connected to the upper end of the vertical connecting rods 27. Several pipe fixing seats 22 are provided on one side of the pressure plate 21, and a second flange connection hole is provided on the pressure plate 21.

[0040] As a preferred embodiment:

[0041] In this embodiment, the movable workbench 10 is provided with two parallel vertical support parts 11. Each vertical support part 11 has a rotating shaft mounting seat 12 at its upper end. A rotating shaft 13 is mounted on the rotating shaft mounting seat 12. Both ends of the flipping platform 15 are connected to the rotating shaft 13 through a swing arm 14. One of the rotating shafts 13 is connected to a power source 23. The power source 23 can be manually controlled or electrically controlled by a stepper motor, so as to flexibly adjust the rotation angle of the flipping platform 15 to facilitate welding operations.

[0042] The first pipe clamp 16 is connected to the tilting platform 15 via the first pipe clamp mounting seat 28.

[0043] The second pipe clamp 17 is connected to the tilting platform 15 via the second pipe clamp mounting seat 29.

[0044] The first pipe clamp mounting base 28 and the second pipe clamp mounting base 29 can be connected to the flipping platform 15 by bolts.

[0045] The top support 18 is a liftable top support, thereby adjusting the height of the first core 3 and the second core 4. The liftable top support is connected to the flipping platform 15 by an adjustable height threaded rod, and the upper end of the top support 18 has a disc-shaped structure.

[0046] The bottom of the movable workbench 10 is equipped with lockable casters 24, which allows the movable workbench 10 to move to match the welding position for convenient welding operations.

[0047] Combination Figures 1 to 6 as well as Figures 10 to 12 As shown, during a three-stage overhaul of the aircraft air conditioning system heat exchanger, the disassembled inlet pipe 1, outlet pipe 2, first core 3, second core 4, first flange 5, and second flange 6 are fixed to a welding fixture and then welded together using argon arc welding. The first flange 5 is fixedly connected to the first flange connection hole 25 on the tilting platform 15 using bolts. The first core 3 and second core 4 are lifted to a suitable height by the top support 18, and the first core 3 is fixed by connecting the first core support 7 on the first core support mounting seat 19. The second core 4 is fixed by connecting the second core support 8 on the second core support mounting seat 20. The inlet of the inlet pipe 1 is connected to the first pipe clamp 16, and the outlet of the outlet pipe 2 is connected to the second pipe clamp 17. The inlet pipe is then adjusted. The outlet pipe 1 and outlet pipe 2 are positioned and spliced ​​onto the first core 3 and the second core 4, awaiting welding. The second flange 6 is placed on the first core 3 and the second core 4, and then a pressure plate 21 is placed above the second flange 6. The second flange 6 is fixedly connected to the second flange connection hole on the pressure plate 21 using bolts. The pressure plate 21 is connected to the upper end of the vertical connecting rod 27, pressing the second flange 6 tightly onto the first core 3 and the second core 4. The pipe fixing seat 22 on the pressure plate 21 is connected to the pipe support 9 on the outlet pipe 2, fixing the outlet pipe 2. After fixing all the above parts of the heat exchanger using welding fixtures, the parts are welded into a single unit using argon arc welding.

[0048] This utility model's welding fixture can fix the various structural parts of the heat exchanger, ensuring that the relative displacement of each part does not occur. After disassembly and repair, the various structural parts are welded together on the welding fixture using argon arc welding to form a whole. Specifically, this includes: welding the first core 3 to the second core 4; welding the inlet pipe 1 and outlet pipe 2 to the first core 3 and second core 4; and welding the first flange 5 and second flange 6 to the first core 3 and second core 4. Welding at multiple locations requires welding operations from multiple angles. During welding, the angle of the tilting platform 15 can be adjusted to facilitate welding operations. The perforated holes 26 on the tilting platform 15 allow welding tools or auxiliary tools to enter, facilitating welding operations from the bottom of the tilting platform 15 and improving welding efficiency. After welding is completed, the heat exchanger is removed from the welding fixture. The connection between the various structural parts of the heat exchanger and the welding fixture can be achieved using bolts, or alternatively, using detachable mechanical connections such as pin connections or clamp fixation, making installation and disassembly convenient.

[0049] The above embodiments of this utility model are not intended to limit the scope of protection of this utility model. The implementation of this utility model is not limited thereto. All other modifications, substitutions or alterations made to the above structure of this utility model based on the above content of this utility model and in accordance with the common technical knowledge and conventional means in the field, without departing from the basic technical idea of ​​this utility model, shall fall within the scope of protection of this utility model.

Claims

1. A welding fixture for repairing heat exchangers in an aircraft air conditioning system, comprising a welding workbench, characterized in that, The workbench is a flipping platform, with both ends rotatably connected to a movable workbench frame. One side of the upper surface of the flipping platform is provided with a first pipe clamp, a second pipe clamp, and a first core support mounting seat, while the other side is provided with a second core support mounting seat. The upper surface of the flipping platform is also provided with several top supports. The flipping platform has several first flange connection holes and several hollow holes. The upper surface of the flipping platform is also provided with several vertical connecting rods distributed around the first flange connection holes and the hollow holes. The upper end of the vertical connecting rods is connected to a detachable pressure plate. One side of the pressure plate is provided with several pipe fixing seats, and the pressure plate has second flange connection holes.

2. The welding fixture for maintaining the heat exchanger of an aircraft air conditioning system according to claim 1, characterized in that: The movable workbench is provided with two parallel vertical support parts. Each vertical support part is provided with a rotating shaft mounting seat at its upper end. A rotating shaft is mounted on the rotating shaft mounting seat. Both ends of the flipping platform are connected to the rotating shaft through swing arms. The rotating shaft is connected to a power source.

3. The welding fixture for maintaining the heat exchanger of an aircraft air conditioning system according to claim 1, characterized in that: The first pipe clamp is connected to the tilting platform via a first pipe clamp mounting seat.

4. The welding fixture for maintaining the heat exchanger of an aircraft air conditioning system according to claim 1, characterized in that: The second pipe clamp is connected to the flipping platform via a second pipe clamp mounting seat.

5. The welding fixture for maintaining the heat exchanger of an aircraft air conditioning system according to claim 1, characterized in that: The top support is a liftable top support.

6. The welding fixture for maintaining the heat exchanger of an aircraft air conditioning system according to claim 1, characterized in that: The bottom of the movable workbench is equipped with lockable casters.

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